ITECH IT7800 Programmable AC Power Supply User Manual

: June 2, 2024
: iTech

Table of Contents

ITECH IT7800 Programmable AC Power Supply
Product Information
Product Usage Instructions
FAQs
Warranty
Safety Precautions
Quick Reference
Inspection and Installation
Getting Started
Operation and Application
System-Related Functions
Set the soft keyboard
Function
System-Related Functions
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ITECH IT7800 Programmable AC Power Supply

ITECH-IT7800-Programmable-AC-Power-Supply-image

Specifications:

Model: IT7800
Version: V1.0/2023.12

Product Information

The IT7800 Series Programmable AC Power Supply is a versatile power supply unit designed to meet various testing and power supply needs. It comes with programmable features that allow users to customize voltage and current outputs for different applications.

Product Usage Instructions

1. Powering On the Unit:

Ensure the power supply is connected to a stable power source and press the power button to turn it on.

2. Setting Voltage and Current:

Use the control panel to set the desired output voltage and current levels according to your testing requirements.

3. Programming Features:

Utilize the programmable features to create custom voltage and current waveforms for specialized testing scenarios.

4. Safety Precautions:

Always adhere to safety notices provided in the manual. Do not proceed beyond warning signs without full understanding of the indicated conditions.

FAQs

Q: How do I reset the unit to factory settings?
- A: To reset the unit to factory settings, locate the reset button on the control panel and press it for a few seconds until the unit restarts.
Q: Can I connect multiple units in parallel for increased power output?
- A: Yes, you can connect multiple IT7800 units in parallel to increase the total power output for higher load requirements. Ensure proper synchronization and matching of settings when doing so.

“`

Programmable AC Power Supply
IT7800 Series User Manual
Model: IT7800 Version: V1.0/2023.12

Notices
© Itech Electronic, Co., Ltd. 2023 No part of this manual may be reproduced in any form or by any means ( including electronic storage and retrieval or translation into a foreign language) without prior permission and written consent from Itech Electronic, Co., Ltd. as governed by international copyright laws.
Manual Part Number
IT7800
Revision
1st Edition: Jun. 8, 2023 Itech Electronic, Co., Ltd.
Trademarks
Pentium is U.S. registered trademarks of Intel Corporation.
Microsoft, Visual Studio, Windows and MS Windows are registered trademarks of Microsoft Corporation in the United States and/or other countries and regions.

Warranty

The materials contained in this

document are provided “as is”, and

is subject to change, without prior

notice, in future editions. Further, to

the maximum extent permitted by

applicable laws, ITECH disclaims all

warrants, either express or implied,

with regard to this manual and any

information contained herein,

including but not limited to the

implied

warranties

of

merchantability and fitness for a

particular purpose. ITECH shall not

be held liable for errors or for

incidental or indirect damages in

connection with the furnishing, use

or application of this document or of

any information contained herein.

Should ITECH and the user enter

into a separate written agreement

with warranty terms covering the

materials in this document that

conflict with these terms, the

warranty terms in the separate

agreement shall prevail.

Technology Licenses

The hardware and/or software described herein are furnished under a license and may be used or copied only in accordance with the terms of such license.

Restricted Rights Legend

Restricted permissions of the U.S.
government. Permissions for software and technical data which are authorized to the U.S. Government only include those for custom provision to end users. ITECH provides this customary commercial license in software and technical data pursuant to FAR 12.211 ( Technical Data) and 12.212 ( Computer Software) and DFARS 252.227-7015 ( Technical Data Commercial Items) and DFARS 227.7202-3 ( Rights in Commercial Computer Software or Computer Software Documentation).

Safety Notices
A CAUTION sign denotes a hazard. It calls attention to an operating procedure or practice that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.
A WARNING sign denotes a hazard. It calls attention to an operating procedure or practice that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.
NOTE A NOTE sign denotes important hint. It calls attention to tips or supplementary information that is essential for users to refer to.

IT7800 User Manual

Quality Certification and Assurance
We certify that IT7800 series power supply meets all the published specifications at time of shipment from the factory.

Warranty
ITECH warrants that the product will be free from defects in material and workmanship under normal use for a period of one ( 1) year from the date of delivery ( except those described in the Limitation of Warranty below).
For warranty service or repair, the product must be returned to a service center designated by ITECH.
The product returned to ITECH for warranty service must be shipped PREPAID. And ITECH will pay for return of the product to customer.
If the product is returned to ITECH for warranty service from overseas, all the freights, duties and other taxes shall be on the account of customer.

Limitation of Warranty
This Warranty will be rendered invalid if the product is:
Damaged resulting from customer-wired circuits or customer-supplied parts or accessories;
Modified or repaired by customer without authorization;
Damaged resulting from customer-wired circuits or use in an environment not designated by us;
The product model or serial number is altered, deleted, removed or made illegible by customer;
Damaged as a result of accidents, including but not limited to lightning, moisture, fire, improper use or negligence.

Safety Symbols
Direct current
Alternating current
Both direct and alternating current Chassis (earth ground) symbol.

ON ( power) OFF ( power) Power-on state Power-off state

Earth ( ground) terminal

Reference terminal

Caution

Positive terminal

Warning ( refer to this manual for specific Warning or Caution information)
Copyright ©ITECH Electronic Co., Ltd.

Negative terminal
i

A chassis terminal

IT7800 User Manual

–

Safety Precautions

The following safety precautions must be observed during all phases of operation of this instrument. Failure to comply with these precautions or specific warnings elsewhere in this manual will constitute a default under safety standards of design, manufacture and intended use of the instrument. ITECH assumes no liability for the customer’s failure to comply with these precautions.
Do not use the instrument if it is damaged. Before operation, check the casing to see whether it cracks. Do not operate the instrument in the presence of inflammable gasses, vapors or dusts.
The instrument is provided with a power cord during delivery and should be connected to a socket with a protective earth terminal, a junction box or a three-phase distribution box. Before operation, be sure that the instrument is well grounded.
Check all marks on the instrument before connecting the instrument to power supply.
Use electric wires of appropriate load. All loading wires should be capable of bearing maximum short-circuit of electronic load without overheating. If there are multiple loads, each pair of the load power cord must be carry out the full rated short-circuit output current of the power securely.
Ensure the voltage fluctuation of mains supply is less than 10% of the working voltage range in order to reduce risks of fire and electric shock.
Do not install alternative parts on the instrument or perform any unauthorized modification.
Do not use the instrument if the detachable cover is removed or loosen.
To prevent the possibility of accidental injuries, be sure to use the power adapter supplied by the manufacturer only.
We do not accept responsibility for any direct or indirect financial damage or loss of profit that might occur when using the instrument.
This instrument is used for industrial purposes, do not apply this product to IT power supply system.
Never use the instrument with a life-support system or any other equipment subject to safety requirements.

SHOCK HAZARD Ground the Instrument. This product is provided with a protective earth terminal. To minimize shock hazard, the instrument must be connected to the AC mains through a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet or distribution box. Any interruption of the protective

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IT7800 User Manual
(grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in injury or death.
Before applying power, verify that all safety precautions are taken. All connections must be made with the instrument turned off, and must be performed by qualified personnel who are aware of the hazards involved. Improper actions can cause fatal injury as well as equipment damage.
SHOCK HAZARD, LETHAL VOLTAGES This product can input the dangerous voltage that can cause personal injury, and the operator must always be protected from electric shock. Ensure that the input electrodes are either insulated or covered using the safety covers provided, so that no accidental contact with lethal voltages can occur.
Never touch cables or connections immediately after turning off the instrument. Verify that there is no dangerous voltage on the electrodes or sense terminals before touching them.

Failure to use the instrument as directed by the manufacturer may render its protective features void.
Always clean the casing with a dry cloth. Do not clean the internals.
Make sure the vent hole is always unblocked.

Environmental Conditions
The instrument is designed for indoor use and an area with low condensation. The table below shows the general environmental requirements for the instrument.

Environmental Conditions Operating temperature
Operating humidity
Storage temperature
Altitude Installation category Pollution degree

Requirements
0°C40°C 20%80%( non-condensation) -10°C70 °C
Operating up to 2,000 meters II Pollution degree 2

Note To make accurate measurements, allow the instrument to warm up for 30 min.

Regulatory Markings

The CE mark indicates that the product complies with all the relevant European legal directives. The specific year ( if any) affixed refers to the year when the design was approved.
The instrument complies with the WEEE Directive ( 2002/96/EC) marking requirement. This affix product label indicates that you must not discard the electrical/electronic product in domestic household waste.

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IT7800 User Manual
This symbol indicates the time period during which no hazardous or toxic substances are expected to leak or deteriorate during normal use. The expected useful life of the product is 10 years. The product can be used safely during the 10-year Environment Friendly Use Period ( EFUP). Upon expiration of the EFUP, the product must be immediately recycled.
Waste Electrical and Electronic Equipment ( WEEE) Directive
2002/96/EC Waste Electrical and Electronic Equipment ( WEEE) Directive This product complies with the WEEE Directive ( 2002/96/EC) marking requirement. This affix product label indicates that you must not discard the electrical/electronic product in domestic household waste. Product Category With reference to the equipment classifications described in the Annex 1 of the WEEE Directive, this instrument is classified as a “Monitoring and Control Instrument”. To return this unwanted instrument, contact your nearest ITECH office.

iv

IT7800 User Manual
Compliance Information Complies with the essential requirements of the following applicable European Directives, and carries the CE marking accordingly: Electromagnetic Compatibility (EMC) Directive 2014/30/EU Low- Voltage Directive (Safety) 2014/35/EU
Conforms with the following product standards:

EMC Standard

IEC 61326-1:2012/ EN 61326-1:2013 ¹²³ Reference Standards
CISPR 11:2009+A1:2010/ EN 55011:2009+A1:2010 (Group 1, Class A) IEC 61000-4-2:2008/ EN 61000-4-2:2009 IEC 61000-4-3:2006+A1:2007+A2:2010/ EN 61000-43:2006+A1:2008+A2:2010 IEC 61000-4-4:2004+A1:2010/ EN 61000-4-4:2004+A1:2010 IEC 61000-4-5:2005/ EN 61000-4-5:2006 IEC 61000-4-6:2008/ EN 61000-4-6:2009 IEC 61000-4-11:2004/ EN 61000-4-11:2004

1. The product is intended for use in non-residential/non-domestic environments. Use of the product in residential/domestic environments may cause electromagnetic interference.
2. Connection of the instrument to a test object may produce radiations beyond the specified limit.
3. Use high-performance shielded interface cable to ensure conformity with the EMC standards listed above.

Safety Standard IEC 61010-1:2010/ EN 61010-1:2010

8

Quick Reference

Chapter1

Quick Reference

This chapter introduces the front panel, the rear panel, key functions and LCD display function of the IT7800 series power supply, make sure that you can quickly know the appearance, instruction and the key function before you operate the power supply. Help you make better use of this series of power supply.

1.1 Brief Introduction
ITECH IT7800 3U high series of programmable AC/DC power supply, with power up to 15kVA, voltage ranges up to 350V L-N. Users are able to increase output power up to 960kVA by configuring master-slave parallel. With intuitive LCD touch panel interface, users can be quickly familiar with the unit operation.
IT7800 series is built-in power meter and arbitrary waveform generator, which is able to simulate harmonics and other arbitrary waveformoutput. Users can choose single phase, three-phase, phase reversal, and multi-channel totally 4 output modes, with programmable output, and complete measurements, ITECH IT7800 series is designed for new energy, power electronics, research institutes etc.
High power density, 3U up to 15kVA
Master-slave parallel with current sharing technology, up to 960kVA, multiple units in parallel work as one
Voltage up to 350V L-N
Output frequency: 16-2400Hz, programmable slew rate setting for changing voltage and frequency
Built-in single/3-phase AC power meter
Multi-channel function, single unit can connect/test up to 3 DUTs1
4 output modes: AC/DC/AC+DC/DC+AC
Choose single phase, three-phase, reverse phase output mode, to simulate 3-phase imbalance, 3-phase harmonics imbalance, split phase test, reverse phase sequence tests etc.1
Comprehensive harmonics measurement and Voltage harmonic simulation, up to 50th
Harmonics, inter-harmonics waveform synthesizer, according to IEC 610004-13
Programmable output impedance
Intuitive touch screen interface
Simulate arbitrary waveform output, support csv. file import
Built-in various waveforms
Support IEC61000-4-11/4-13/4-14/4-17/4-28/4-29
List mode simulates the power supply reproduction function to realize the simulation function of instantaneous power interruption
Provides various trigger input/output signals. When amplitude/frequency change, trigger signals can be generated to synchronously capture the current waveform of DUTs
Output 0-360 ° start/stop phase angle can be set

9

Surge/Sag function

Quick Reference

Relay CTRL function, to cut off the connection between instrument and DUT

Built-in USB/CAN/LAN/Digital IO interface, optional GPIB / Analog&RS232

With professional software, set up programs comply with multinational security regulations and test conditions, to complete civil aviation electronics and IEC related standards testing

*1: 3k/5kVA model only support single phase and single channel.

Model IT7802-350-10U IT7802-350-10U-ATE IT7803-350-30U IT7803J-350-30U IT7804-350-20U IT7804-350-20U-ATE IT7805-350-30U IT7806-350-30 IT7806-350-30-ATE IT7806-350-90 IT7809-350-90 IT7812-350-90 IT7815-350-90 IT7830-350-180 IT7845-350-270 IT7860-350-360 IT7875-350-450 IT7890-350-540 IT78105-350-630 IT78120-350-720 IT78135-350-810 IT78150-350-900 IT78165-350-990

Power 2kVA 2kVA 3kVA 3kVA 4kVA 4kVA 5kVA 6kVA 6kVA 6kVA 9kVA 12kVA 15kVA 30kVA 45kVA 60kVA 75kVA 90kVA 105kVA 120kVA 135kVA 150kVA 165kVA

Voltage 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V 350V

Current 10A 10A 30A 30A 20A 20A 30A 30A 30A 90A 90A 90A 90A 180A 270A 360A 450A 540A 630A 720A 810A 900A 990A

Phase
1 1 1 1 1 1 1 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3 1 or 3

height
2U 1U 3U 3U 2U 1U 3U 2U 1U 3U 3U 3U 3U 6U 15U 27U 27U 27U 27U 37U 37U 37U 37U

Note
Naming rules for this series of model are as follows: IT78XXX-YYY-ZZZ, wherein, XXX means rated power, YYY means rated voltage, and ZZZ means rated current. Take IT7815-350-90 for an example, the rated power is 15kVA, rated voltage is 350V and rated current is 90A. In addition, ATE indicates that this model is a system model without an operator panel.

10

1.2 Front Panel Introduction
The front panel of IT7800 is as shown below.
The front panel of the model 2U is shown below.

Quick Reference

The front panel of the model 2U is shown below.

1 Power Switch 3 LCD touch screen 5 Number key 7 Rotary knob

2 USB interface /Print/Trig/Menu 4 Function key 6 Up, down, left and right key and enter key 8 Vent hole

1.3 Keyboard Introduction
The keyboard introduction of IT7800 series Power Supply is shown as follows.

Keys

Description

Print

Used for saving screen images

Trig

Used for manual trigger

11

Keys Power Menu [V-set] [F-set] Config

Description Power Switch Used for going back to menu page Set the output voltage value
· AC mode: set the output frequency · DC mode: [F-set] is invalid Enter to Configuration menu

Quick Reference

[On/Off] Shift
Esc [0]-[9] +/ . Left / Right Navigation keys
Up / Down Navigation keys Enter

Basic meter key used for basic metering.
Waveform Display key When this key is pressed, the waveform corresponding to current measurement data will be displayed. Harmonic Measurement key When this key is pressed, the harmonic measurement results and the menu of harmonic measurement parameter configuration will be displayed. Turn the power supply output on or off. When lit, indicates that the output is enabled or on.
Composite key, combined with other keys to realize functions marked above keys.
Press this key to exit the current operation interface.
Number key. Enter the number directly Positive and negative signs
Decimal point
The left and right navigation keys are used to adjust the cursor to the specified position or scrolls pages to view menu items.
The up and down navigation keys are used to scroll page up and down to view menu items.
Operation confirmation key.

Composite key [Shift], combined with other keys to realize functions marked
above keys. In this manual, composite key is displayed as [Shift]+[Esc]. Firstly, press [shift] and the shift key will be lighted, and then press the function key, the detailed functions are listed as follows.

Keys [Shift]+V-set

Description Enter the List function menu.

[Shift]+[F-set] (Sweep)

Enter the Sweep function menu.

[Shift]+Config

Enter the protection setting menu.

[Shift]+

(System)

[Shift]+ Surge&Sag [Shift]+

Standard

Enter the System setting menu. Used to set the system parameters. Enter the Surge and Sag menu, used to Set the Surge/trapped Configuration.
Enter the standard regulation wave selection interface.

12

Keys [Shift]+1 [Shift]+ [2] (Lock) [Shift]+[3] (Local) [Shift]+[4] (Save) [Shift]+ [5] (Recall) [Shift]+ [6] (Hold)
[Shift]+ [7] (Help)

Quick Reference
Description Enter the data logging function menu.
Turn the keyboard lock on or off.
Switch remote control mode to local control mode.
Save the common parameter settings.
Enter the Protect menu of the power supply. When you need to keep the present meter status, you can press the keys. Then the present meter status display and will be kept no matter whether output is running. Obtain the help information.

1.4 Push-on Knob
The IT7800 series Power Supply provides a knob on the front panel as shown in the next figure.

The functions of the posh-on knob is described as follows. Adjust the value setting Select menu item Confirm the set value or the selected menu item
Adjust the Value Setting
In the value setting interface, rotate the knob clockwise to increase the set value and anticlockwise to decrease the set value.
Select Menu Item
The knob can also be used to view menu items. In the menu item display interface, turning the knob clockwise indicates that the next menu item is selected, and turning the knob anticlockwise indicates that the previous menu item is selected.
Confirm settings
After completing the value setting or selecting a menu item, pushing the knob acts like pressing [Enter] key to confirm the operation.

1.5 Rear Panel Introduction
The rear panel of the IT7800 series 3U model is shown below.
2U model rear panel illustration.

13

Quick Reference

3U model rear panel illustration.

2 31

4

5 6 78 9

10

No. Name 1 ground terminal
2 Output terminals(M6)
3 Remote sense Terminals Output lock terminals and
4 Optional expansion slot
5 I/O terminals/CAN interface
6 LAN interface

Description
Ground screw for making chassis ground connections. AC or DC output terminals and chassis ground terminals, used to connect DUT. SL+ and SN- are remote sense terminals, used for maximizing measurement accuracy.
Optional interfaces: (Plastic plugs are inserted by default when the user does not purchase the interface.) The optional interface as follows: GPIB RS-232/ Analog interface Digital Port
CAN communication interface CAN-H and CAN-L (Reserved) LAN communication interface

14

7 External control interface CTRL
8 USB interface 9 system bus 10 AC power input
Socket(M4)

Quick Reference
This interface is used for the parallel connection between the master (with operation panel) and the slaves (without operation panel). Connect the interface on the rear panel of each unit to be connected in parallel, and the master can offer synchronous control over the power-on/off of the slaves. USB communication interface.
Used for communication between instruments in parallel operation feature. Used to connect AC power to start instrument.

The rear panel of IT7800 series 15U and above series cabinets are the same. Take IT7845-350-270 as an example, the rear panel is introduced as shown below.

4

1 2

3

1: 10A output socket, which can be used when users need single-phase 220V/10A power supply
2: Output terminals and protective cover, remove the protective cover to show ABCN terminals and sense terminals
3: Input terminal, connected to the instrument’s power supply
4: The communication interface for cabinet, the detailed diagram as follows, and the descriptions are the same as 3U model.

15

Quick Reference

1.6 Home-Screen Overview
IT7800 series power supply adopts touch screen design, Users can select and switch directly by pressing or dragging on the screen.
The power supply can work in either single-phase mode or three-phase mode. The working mode can be set in the system menu. The display interface of the instrument is different under different modes.

Single Phase Mode
The meter interface of IT7800 series power supply is shown as follow.

Status bar

Voltage setting&meter value Frequency setting&meter value

Display area of measuring data
Three Phase Mode
The meter interface of IT7800 three phase mode is shown as follow. The parameters are the same as the single phase.

16

Quick Reference
Under three-phase mode, display total parameters corresponding to Phase A, B and C, the user can switch screen and view the total parameters of each phase. When you press the basic meter button or drag the screen left, you can switch from the three-phase display interface to the single-phase display interface. By default, phase A is displayed in the single-phase display interface. Click A, B and C to switch. The meter interface of phase A is shown as follow, the display parameters are the same as single mode except for the phase indicator.

Introduction to Interface Symbols

The interface of IT7800 power supply will display the following symbols. All the

symbols and description are listed in the table below.

Char

Function description Char Function description

Shift

Compound key

Output is off

Output is on
Single phase AC mode
Copyright ©ITECH Electronic Co., Ltd.

Key operation is locked
Three phase AC mode
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Char

Function description Single phase DC mode

Char

Split phase AC mode
Split phase AC+DC mode Single phase DC+AC mode
Multi-channel AC mode

Multi-channel DC mode
The AC source is in remote mode
Fast speed

Quick Reference
Function description Three phase AC+DC mode
Split phase AC mode
Split phase DC+AC mode Single phase AC+DC mode Multi-channel AC+DC mode Multi- channel DC+AC mode
Surge&Sag function indicator
Low speed

Medium speed

SYNC unlock

Current limit
External Simulation Test Function
LIST is running
LIST function is waiting for trigger
Sweep running indicator

Sink power
Record log
LIST is finished Sweep function is waiting for trigger Found USB disk

Sense indicator

Sense Error

Unbalanced current Input oscillation protection Over voltage protection
Peak OCP
Over power protection

Output inhibit
Peak OVP
Over temperature protection AC/AC+DC mode RMS OCP
Fiber is error

Watch dog
Cue image collapse, click to expand all icons

Command error SYNC lock

18

Char

Function description Voltage simulation

Char

Quick Reference
Function description
Voltage sample

Menu Interface
Press [Menu] key and enter to the menu interface. The screen contains ICONS for all function options. You can select them by using arrow keys or knob, or directly touch the ICONS to enter the corresponding function setting page.

1.7 Optional accessories
The IT7800 series supports the following optional accessories (sold separately), the details are shown as below:

The interface expansion slot provided on the rear panel of the IT7800 series

instrument allows users to flexibly expand according to their needs. Different interface cards can be selected to achieve different functions.

The following optional accessories from ITECH are sold separately. Users need to purchase separately.

Device Name

Model

Description

GPIB communication interface

IT-E176

When the user needs to use GPIB interface to enable remote operation, this option is the right choice.

RS232+Analog IT-E177

Interface card that includes RS-232 communication interface and external analog. When the user needs to use RS232 or external analog interface to enable remote operation, this option is the right choice.

19

Device Name

Model

Fiber modules cables

optic IT-E168 and

Fiber modules cables

optic IT-E169 and

Description

Quick Reference

Used for parallel connection between the units in a cabinet, including one fiber module and two fiber cables, with lengths of 1.5 meters and 0.3 meters.

The fiber optic module and cable are the necessary accessories for the parallel connection. Different numbers of fiber optic modules and cables are used in different numbers of parallels.

Used for parallel connection between cabinets, including one fiber module and one 2.5m fiber cable.

The fiber optic module and cable are the necessary accessories for the parallel connection. Different numbers of fiber optic modules and cables are used in different numbers of parallels.

20

Inspection and Installation

Chapter2

Inspection and Installation

2.1 Unpacking and Transportation

Unpacking

For cabinet products, they are packaged in wooden boxes at the factory. After you receive them, please refer to the unpacking instructions provided with the box for disassembly; for products packaged in cartons, please use appropriate tools for unpacking.
It is recommended to keep the complete transport packaging for the lifetime of the device for relocation or return to the manufacture for repair.

Transportation
If you need to transport non-cabinet products, you must pay attention to the following to ensure the safety of equipment and personnel.

Before moving, make sure that the cabinet or stand where the equipment will be placed has been fixed and meets the load-bear- ing conditions to avoid tilting and collapsing, causing personnel to be injured, and equipment broken.
Due to the weight of the product, transport by hand should be avoided where possible. If unavoidable, carry it with two people and holding the product shell and not external parts (such as han- dles, electrodes, knobs, etc.).
When carrying, be prepared to bear the weight to avoid sprains or being crushed by heavy objects.
Use suitable safety clothing, especially safety shoes, when carrying the equipment, as due to its weight a fall can have serious consequences.
After unpacking the cabinet product, if you need to move it to other places, you must pay attention to the following matters to ensure the safety of equipment and personnel.

The cabinet product is very heavy. Before moving to another loca- tion, confirm whether the ground load is in compliance.

During the process of moving the cabinet, it is recommended that two or more people cooperate and push it slowly and at a constant speed. If you encounter a pit, you need to pay special attention. It is forbidden to push it quickly, otherwise it will easily cause excessive inertia and cause the casters at the bottom of the cabinet to jam and the cabinet to fall.

It is not advisable to push down the slope to prevent the cabinet from

falling down due to the shift of the center of gravity. It is rec- ommended

21

Inspection and Installation
to use a forklift or crane to move the cabinet.
ITECH 27U and 37U cabinets are equipped with hoisting rings as standard on the top. It is recommended to use a crane equipped with a four-leg hoisting belt structure for horizontal hoisting and moving, and ensure that the four hoisting belts are the same length to avoid cabinet skew during movement. As shown below.
After moving to the destination, please lock the four casters to se- cure the cabinet.
The cabinet should be placed on a level ground. It is forbidden to place the cabinet on a sloped ground.

2.2 Verifying the Shipment
Open the package and check the articles within package box before operation. In case of any non-conformity, missing or appearance wearing, please contact ITECH immediately.

The package box should comprise:

Device name Programmable AC Power Supply
Power Cord
USB cable Calibration Certificate

Quantity x1
X1 x1

Model IT7800 series
–
–

Remarks
For the specific models included in this series, refer to 1.1 Brief Introduction.
Number of the power cords vary depending on the model, See the Section 2.4 Connectiong the Power Cord for power cord connection. Used for communicating with the PC.

x1

–

Test report before delivery

22

Inspection and Installation
NOTE After confirming that package contents are consistent and correct, please appropriately keep package box and related contents. The package requirements should be met when the instrument is returned to factory for repair. The IT7830-350-180 model comes with a yellow optical fiber cable. The fiber cable need to install by yourself. For details, see 2.6 chapter.
2.3 Instrument Size Introduction
The instrument should be installed at well-ventilated and rational-sized space. Please select appropriate space for installation based on the power supply size.
IT7802-350-10U-ATE/IT7804-350-20U-ATE/IT7806-350-30-ATE Model

IT7802-350-10U/IT7804-350-20U/IT7806-350-30 Model

23

Inspection and Installation
IT7803-350-30U/IT7803J-350-30U/IT7805-350-30U/IT7806-350-90/IT7809-350-90/IT7812350-90/IT7815-350-90 Model

24

IT7830-350-180 Model

Inspection and Installation

25

IT7845-350-270 Model

Inspection and Installation

26

Inspection and Installation
IT7860-350-360/IT7875-350-450/IT7890-350-540/IT78105-350-630 Model

27

Inspection and Installation
IT78120-350-720/IT78135-350-810/IT78150-350-900/IT78165-350-990 Model

2.4 Connecting the Power Cord
Connect power cord of standard accessories and ensure that the power supply is under normal power supply.
Before connecting the power cord
To prevent electric shock and damage to the instrument, observe the following precautions.

Before connecting power cord, be sure to confirm that the power voltage matches with the rated input voltage of the instrument.

28

Inspection and Installation
Before connecting power cord, be sure to switch off the instrument. Verify that there is no dangerous voltage on the connection terminals.
To avoid fire or electric shock, Make sure to use the power cord supplied by ITECH.
Be sure to connect the power cord to the AC distribution box with protective grounding. Do not use terminal board without protective grounding.
Do not use an extended power cord without protective grounding, otherwise the protection function will fail.
Ensure that the power cord connection terminals are either insulated or covered by the supplied protective cover so that no accidental contact with lethal voltage can occur.
Safety agency requirements dictate that there must be a way to physically disconnect the AC mains cable from the unit. A disconnect device, either a switch or circuit breaker must be provided in the final installation. The disconnect device must be close to the equipment, be easily accessible, and be marked as the disconnect device for this equipment.
Connecting the power cord
The standard power cord specifications for this series are divided into the following types according to different regions:

The yellow-green wire is grounding wire, which is connected to the PE terminal of power input on the rear panel; the others are live wires, which are correspondingly connected to the L1, L2 and L3 terminals of power input on the rear panel.

29

Inspection and Installation
NOTE
IT7930-350-180 is standard equipped with two power cords.

AC Power Input Level
The default AC input of this series of instruments is three-phase AC voltage (three-phase four-wire system), some models support single-phase input, please refer to the following table for specific model description.

AC input requirements and output power derating:

AC Input

1-Phase (VLN)

Input Voltage 200-220±10%

3-phase 4-wire (VLL)
200-220±10%

3-phase 4-wire (VLL)
380-480±10%

2 kVA

1.5 kVA

FS.

3 kVA3U FS.

FS.

4 kVA

1.5 kVA

3 kVA

FS.

5 kVA

3 kVA

FS.

6 kVA2U 1.5 kVA

3 kVA

FS.

6 kVA3U Not support

FS.

9 kVA

Not support

FS.

12 kVA

Not support

60%FS.

FS.

15 kVA

Not support

60%FS.

FS.

Connecting the Power Cord
When connecting the instrument which rated power is 3kVA or 5kVA
The IT7803J-350-30U model can be directly connected to a single-phase power supply.
Please take care for balanced current distribution on three phases. For single unit, it supports single phase input, and it requires single phase or three phases of AC distribution box. In case multiple units are connected to the same main AC distribution box. It is recommended to follow the suggestion connection diagram as below.
Single phase input connecting:

30

Multiple power supplies connect to three phase input:

Inspection and Installation

When connecting the instrument which rated power is 6kVA or above
The 15kVA power supply is equipped with a standard four-core power cord. The 30kVA power supply is equipped with two four-core power cords, which are connected to the AC input terminals of the two modules respectively.
The AC input is three phase and balanced, connecting the power cord as below.

Connecting the power cord

1. Confirm that the switch of the AC power distribution box is off.

2. Confirm that the power switch is in the OFF position and verify that there is no dangerous voltage on the connection terminals.

3. Remove the protective cover outside the AC input terminal on the rear panel.

4. Connect one end of the power cable’s round terminal to the AC power input terminal on the instrument’s rear panel.

a) You only need to connect the red/green/yellow (or brown/black/gray) live wires to the terminals on the rear panel, which are not required to

31

Inspection and Installation
correspond to L1, L2 and L3 terminals one by one.
b) The yellow-green wire is grounding wire, which is connected to the protective grounding terminal (PE).
5. Mount the protective cover back to its original position.
6. Refer to the suggestion connection diagram, connect the other end of the power cable to the required AC distribution box.
Connect the two power cables of the IT7830-350-180 to the power distribution box.
2.5 Connecting Test Lines ( Optional)
Test lines are not standard accessories of the instrument. Please select optional red and black test lines for individual sales based on the maximum current value. For specifications of test lines and maximum current values, refer to “Specifications of Red and Black Test Lines” in “Appendix”.
Before connecting test lines, be sure to switch off the instrument. Power switch is in Off position. Otherwise, contact with output terminals in rear panel may cause electrical shock.
To avoid electrical shock, before testing, please make sure the rating values of the testing lines, and do not measure the current that higher than the rating value. All test lines shall be capable of withstanding the maximum short circuit output current of the power supply without causing overheat.
If several loads are provided, each pair of load wires shall safely withstand the rated short circuit output current of the power supply under full load.
Always use test lines provided by ITECH to connect the equipment. If test lines from other factories are used, please check that the test line can withstand maximum current.
Specification for Test Cables Test cables are not standard accessories for the instrument. Please select optional red and black test cables for individual sales based on the maximum current value. For specifications of test cables and maximum current values, refer to A.1 Specifications of Red and Black Test Cables for more information.
Connecting the DUT (Local Measurement) The instrument supports two kinds of wiring methods with the DUT: local measurement and remote measurement (SENSE). The default test mode is local measurement.
NOTE
The T7830-350-180 consists of two 15kVA in parallel mode. The output terminals and Remote sense terminals use the master port. The wiring method is the same as other models.

32

Inspection and Installation
IT7800 series 2U model backplane terminal appearance and 3U model is different, but the wiring principle is the same, the following content and diagram to 3U model for example. 2U model corresponding output terminals can be.
Please confirm that the Remote Sense function in the menu is set to Off, otherwise the instrument will report an error in the present connection mode.
The connection diagram of single phase is shown as follow:

NOTE When the output voltage has DC voltage, the output terminal L is positive, and N is negative.
The connection diagram of three phase is shown as follow: (Take the Y-type method as an example)

The above diagram shows Y-type wiring as an example, if the user needs Deltatype wiring, please directly suspend the N terminal.

33

Inspection and Installation
The connection diagram of split phase is shown as follow:
NOTE When the output voltage has DC voltage, the output terminal A is positive, and B is negative.
The connection diagram of single phase is shown as follow:

NOTE
When the output voltage has DC voltage, the output terminal L is positive, and N is negative.
1. Confirm that the power switch is in the OFF position and verify that there is no dangerous voltage on the connection terminals.

2. Remove the output terminals cover of the power system.

3. Loosen the screws of the output terminals and connect the red and black test cables to the output terminals. Re-tighten the screws.

When maximum current that one test cable can withstand fails to meet the rated current, use multiple pieces of red and black test cables. For example, the maximum current is 1,200A, then 4 pieces of 360A red and black cables are required.

4. Thread the red and black test cables through the output terminals cover of the power system and install the cover.

5. (Optional) According to the actual situation of DUT, connect the grounding

34

Inspection and Installation
terminal on the rear panel of the instrument to the DUT to ensure the safe grounding.
For the location information, see 1.5 Rear Panel Introduction.
6. Connect the other end of the red and black cables to the DUT. The positive and negative poles must be properly connected and fastened when wiring.
Connecting the DUT (Remote Sensing)
Remote measurement is available for the following scenarios:
When the DUT consumes large current or the wires are too long, there is a voltage drop on the wires between DUT and output terminals of the power system.
To maximize measurement accuracy, the power system provides the remote measurement terminals VS+ and VS- on the rear panel, which can be used to measure the terminal voltage of the DUT.
When the power system is used for battery testing in actual applications, the voltage drop of the wire will lead to voltage inconsistency of both ends and inconsistency of the cutoff voltage of power system and the actual voltage of battery, resulting in inaccurate measurement.
The connection diagram and steps of remote measurement are as follows:
NOTE
The T7830-350-180 consists of two 15kVA in parallel mode. Connect the Remote sense terminals of master module. The wiring method is the same as other models. The connection diagram of single phase is shown as follow:

NOTE
When the output voltage has DC voltage, the output terminal L is positive, and N is negative.
The connection diagram of three phase is shown as follow: (Take the Y-type

35

method as an example)

Inspection and Installation

The above diagram shows Y-type wiring as an example, if the user needs Deltatype wiring, please directly suspend the N terminal. And the the N wire of Sense terminal needs to be connected to the N terminal of the output terminal
When serving as an inverting power supply output, the N wire of Sense terminal needs to be connected to the N terminal of the output terminal, The connection diagram of split phase is shown as follow:

NOTE
When the output voltage has DC voltage, the output terminal A is positive, and N is negative.

1. Confirm that the power switch is in the OFF position and verify that there is no dangerous voltage on the connection terminals.

2. Remove the output terminals cover of the power system.

3. Refer to the wiring diagram and connect the Vs+ and Vs- with armored twisted-pair cables. Loosen the screws of the output terminals and connect the red and black test cables to the output terminals. Re-tighten the screws.

36

Inspection and Installation
When maximum current that one test cable can withstand fails to meet the rated current, use multiple pieces of red and black test cables. For example, the maximum current is 1,200A, then 4 pieces of 360A red and black cables are required. 4. Thread the red and black test cables through the output terminals cover of the power system and install the cover. 5. (Optional) According to the actual situation of DUT, connect the grounding terminal on the rear panel of the instrument to the DUT to ensure the safe grounding. For the location information, see 1.5 Rear Panel Introduction. 6. Connect the other end of the remote sense cables to the DUT. 7. Connect the other end of the red and black cables to the DUT. The positive and negative poles must be properly connected and fastened when wiring. 8. Power on the instrument and turn on the Sense function of the instrument.
2.6 Installing Fiber Cables (Only for IT7830-350-180)
IT7830-350-180 model is composed of two 15kVA parallel machines. In order to avoid damage to the fiber cords connected in parallel with the master and slave during transportation, the fiber cords are not installed before delivery. After receiving the instrument, users need to install the yellow fiber cable by themselves.
Before connecting the cables, ensure that the instrument power switch is off and the main switch of the AC power input (distribution box) is off.
Fiber optic cables cannot be flexed or folded. When the cable is too long and needs to be arranged, gently wrap the cable in a circle and gently tie it.
As shown in the following figure, connect the System Bus between the master and slave by fiber cords.

37

Getting Started

Chapter3

Getting Started

3.1 Power-on the Instrument
A successful selftest indicates that the purchased power product meets delivery standards and is available for normal usage.
Before operation, please confirm that you have fully understood the safety instructions.

Precautions

To prevent electric shock and damage to the instrument, please observe the following precautions.

Before connecting power cord, be sure to confirm that the power voltage matches with the supply voltage.
Before connecting power cord, be sure to switch off the instrument. Verify that there is no dangerous voltage on the terminals before touching them.
To avoid fire or electric shock, make sure to use the power cord supplied by ITECH.
Be sure to connect the main power socket to the power outlet with protective grounding. Do not use terminal board without protective grounding.
Do not use an extended power cord without protective grounding, otherwise the protection function will fail.
Ensure that the input electrodes are either insulated or covered using the safety covers provided, so that no accidental contact with lethal voltages can occur.
If you notice strange sounds, unusual odors, fire, or smoke around or from inside the instrument, flip the POWER switch to the (O) side to turn the instrument off, or remove the power cord plug from the outlet. The detachable power cord may be used as an emergency disconnecting device. Removing the power cord will disconnect AC input power to the unit.

Safety agency requirements dictate that there must be a way to physically disconnect the AC mains cable from the unit. A disconnect device, either a switch or circuit breaker must be provided in the final installation. The disconnect device must be close to the equipment, be
easily accessible, and be marked as the disconnect device for this
equipment.

38

Getting Started
Power Switch Introduction
The POWER switch knob of the IT7800 series power supply is on the left side of the front panel. The user can turn ON the power by 90° clockwise.
Turning the POWER Switch On
Check that the power cord is connected properly.
Flip the POWER switch to the ( ON) side to turn the instrument on. The front panel display will light up after a few seconds. It may take about 30 seconds or so for the power supply to initialize before it is ready for use.
If a self-test error occurs, an error message will be displayed in the front panel. Press the [Esc] button to try to clear the current fault status. The user can also restart the instrument to try to clear the fault status. Wait until the power is turned off and then start again. If the problem still cannot be solved after restarting, please contact the ITECH engineer.
Turning the POWER Switch Off
Flip the POWER switch to the ( OFF ) side to turn the instrument off. When it is turned off, the instrument interface will prompt power down, and the instrument will store the setting information before shutdown in the nonvolatile memory.
After you turn the POWER switch off, wait at least 10 seconds after the fan stops before you turn the POWER switch back on. Turning the instrument on too soon after you turn it off can cause damage to the inrush current limiter circuit, as well as reduce the life of components such as the POWER switch and the internal input fuses.
3.2 Touch Screen Introduction
This series of power display is a touch screen LCD interface, users can select and set parameters by hand touch.The touch function can be set in the system menu.
Touch screen drag and corresponding functions are described as below. Convenient user quickly understand how to use this power supply.

3.3 Set output parameters
The voltage value and frequency value can be programmed, which can be set to different parameters within the specification range based on customer requirements. This can meet various test requirements of the customer.

39

Getting Started
After the user presses the V-set or F-set keys on the front panel, the instrument interface displays the parameters to be set and the cursor flashes for prompt. The user can use the following methods to set the values.
Directly use the number keys to set the value. Rotate the knob to set the data in the cursor position. Rotate the knob
lockwise to increase the set value and anticlockwise to decrease the set value. Once the data in the cursor position increases to ten, the value will add one to the front position automatically. and once the data in the cursor position decreases to zero, the value will minus one from the front position automatically. This provides convenience for the user to set. The knob can works with the left or right keys. Use the left or right keys to move the cursor position.
NOTE
After entering the menu interface, the knob can also be used to scroll pages to view menu items.
3.4 Output On/Off Control
The [On/Off] key is used to turn the output on or off under normal circumstances. Even if the instrument is in control by PC or the keyboard is locked, the [On/Off] is still valid for turn off output.
The [On/Off] key light is off and turning the output off does not place the instrument in a safe state. Hazardous voltages may be present on all output and guard terminals. Putting the equipment into an output-off state does not guarantee that the outputs are powered off if a hardware or software fault occurs. See the cautions about connecting the test lines before connecting test lines.
You can press the [On/Off] key on the front panel to control the output status of the power supply. If the [On/Off] key light is on, indicates that the output is turned on. The VFD displays the meter value such as voltage, current, power and so on. If the [On/Off] key light is off, indicates that the output is turned off. The VFD displays that the power supply state is OFF.

40

Operation and Application
Chapter4

Operation and Application

This chapter describes operations of the keys on the front panel of the AC power supply. The AC power supply must be in the local mode when controlled by the front panel. The default mode is the local mode after the AC power supply is turned on. In the local mode, the user can enable all functions of the power supply through the front panel.
4.1 Select Voltage or Current Operation Mode
This series of power supply support voltage source mode and current source mode. The user selects Device operation mode in the system menu and chooses Volt Source mode or Current Source mode.
4.2 Select the Power Supply Mode
The IT7800 series provides multiple modes such as single-phase, three-phase, reverse phase and multi-channel, which can be selected by the user through the panel menu. Under the reverse mode, the rated voltage will be extended to 200%. The multi-channel function allows users to test 3 independent DUT at the same time without adding additional hardware configuration. The operation steps are as follows.

1. Press [Shift] +

(System) enter to system menu.

2. Under the Source setting interface, touch the screen or rotate the knob to select the Phase and set the power supply phase mode.

Single Phase
Under the single phase, the power supply works as a single phase power supply. the output mode can be set to AC/DC/ACDC/DCAC.

Three Phase
Under the three phase mode, the power supply works as a three phase power supply. the output mode can be set to AC/ACDC.

Reverse Phase
Under the reverse phase, the power supply works as a single phase power supply, and the rated voltage will be extended to 200%. For example, AC power supply rated voltage is 350V, under the reverse phase mode, the reted output voltage is 700V. And the output mode can be set to AC/DC/ACDC/DCAC.

Multi-channel

Under the Multi-channel phase, the power supply works as a single phase power supply and have three channels.

The multi-channel function of the IT7800 series allows users to test 3 independent DUTs at the same time without adding additional hardware

41

Operation and Application
configuration. In the traditional solution, the user needs to configure 3 AC power supplies; and one IT7800 device can meet multi-channel testing requirements. Under the Multi-channel mode, the parameters can be set independently. The output mode can be set to AC/DC/ACDC/DCAC.

4.3 Select the Output Mode
The IT7800 series has four output modes: AC, DC, AC+DC, DC+AC. It not only provides pure AC/DC output, but also can use AC+DC and DC+AC output modes to realize “AC output plus DC bias” And “DC output waveform with ripple”, which cover a wider range of applications.
The output mode can be select in the system menu.

1. Press [Shift] +

(System) enter to system menu.

2. Under the Source setting interface, touch the screen or rotate the knob to select the [Output couple mode] and set the output mode.

4.3.1 AC Output Mode
If the output mode select to AC Mode, the instrument will simulate AC power supply. The default set of IT7800 series power supply is AC Mode.
Set the output parameters of the power supply in the main interface, including the output voltage, output frequency.
Press up/down keys to select setting value and then press Enter to confirm. Rotate the knob to select setting value and then press Enter to confirm. Touch screen and then press Enter to confirm.

4.3.2 DC Output Mode
If the output mode select to DC Mode, the instrument will simulate DC power supply. Set the output voltage and current of the DC power supply in the main interface, as shown in the figure below.
Press up/down keys to select setting value and then press Enter to confirm. Rotate the knob to select setting value and then press Enter to confirm. Touch screen and then press Enter to confirm.

42

Operation and Application
4.3.3 AC+DC Mode
If the output mode select to AC+DC Mode, the instrument will simulate AC and DC power supply, which can add DC component to AC voltage. Set the output voltage in the main interface, as shown in the figure below.

Under AC+DC mode, Set the output voltage and frequency of the AC power supply in the main interface, and set the DC voltage in the configure menu.
Vac: you can set the Vac under the main interface or under the config interface.
DC: set the DC component under the config interface. DC value can not be set in three-phase balance mode. To set the three-phase DC component, turn off the balance mode.
NOTE
The AC + DC mode not only expands the application range of pure AC voltage, but also expands the application range of DC component in laboratory testing.When using AC+DC for testing, please first understand the ripple parameters of the instrument when it is used as a DC power supply. If there are strict noise requirements, additional DC noise filters are needed to obtain low noise and good stable DC voltage for testing.

43

Operation and Application
4.3.4 DC+AC Mode
If the output mode select to DC+AC Mode, the instrument will simulate DC power supply, which can add AC component to DC voltage. The interface as shown in the figure below.

Under DC+AC mode, Set the Vdc in the main interface, and set the Vac in the configure menu. Vdc: you can set the Vdc under the main interface or under the config interface.
Ripple control: set the Vac component and frequency under the config interface.
4.4 Waveform Selection
In AC mode or AC+DC mode, the user can set the output waveform in the config menu of IT7800 series power supply. Eight output waveforms below are available, user can select the waveform in Config->Waveform menu.

Sine

44

Square

Operation and Application

Sawtooth Triangle

Trapezoid

Clipped-sine

Rectifier

THD wave

User-defined

When Trapezoid, Clipped-sine, Rectifier, THD Wave and User-define are selected, the user should configure the parameter of waveform.

4.5 Auto-range Function
IT7800 series power supply can achieve the combined output of multiple voltage and current at a fixed power. Single power supply can meet different DUT tests with high voltage low current or high current low voltage, at the same time, because the output of voltage and current is controlled by the limit power, it will show the switching of voltage and current auto ranging. To avoid Intermittent output shutdown when switching the high range and low range.

4.6 Output Characteristic
The output of IT7800 power supply is affected by the limit power and frequency range, and the output voltage and current range will show the trend as shown in the figure below.

45

Operation and Application

Voltage and frequency affect each other, as shown above, different colorful lines represent different frequency bands, and different frequency affect the maximum output voltage, see specifications for curve relationships.
And at different frequency, the output current is also limited by the voltage due to the minimum load resistance. For example, when frequency is 1kHz, minimum voltage of 30V or more is required for 100% current output.

4.7 Current Limit Mode and Power Limit Mode
The IT7800 series power supply defaults to constant voltage CV output mode. The output voltage can be set in main interface.
When the actual current value is higher than the setting current limit value, power supply works in current limit mode, and output voltage will be reduce.
When the actual power value is higher than the setting power limit value, power supply works in power limit mode, and output voltage and current will be adjust.
The current limit value can be set in the Protection menu. Refer to 5.6 Protection Function for detailed setting methods.
NOTE
Current limited or power limited operation mode is only valid when pulling load with constant resistance, please contact ITECH engineer for other test situation.

4.8 Sweep Function
The Sweep function is used to test efficiency of power supply and capture the voltage and frequency at the maximum power point. The voltage and frequency of power may be altered in the form of step ladder by setting the initial voltage, final voltage, step voltage, initial frequency, final frequency, step frequency and one-step time.
The Sweep function is not supported in multi-channel mode.

Operating steps

Press [Shift] + [F-set]Sweepon the front panel to enter the sweep

interface, as shown in the figure below.

46

Operation and Application

2. Set the voltage and frequency parameters in the sweep interface.

Parameters in the sweep interface are described as follows:

Parameter Start voltage

Explain Set the starting voltage.

Stop voltage Step Voltage Start freq Stop freq Step freq Step time Mode
Repeat Count Priority

Set the ending voltage.
Set the step voltage.
Set the starting frequency.
Set the ending frequency.
Set the step frequency.
Set the step time.
Set the sweep mode. Time: Time Sweep Mode Trig: Trigger mode Time-back-forth: Step switching according to time and scanning back and forth. Trigger-back- forth: Step switching according to trigger and scanning back and forth.
Sweep repeat count
Priority setup Volt-Priority Freq-priority Volt&Freq

47

Parameter Waveform
Finish Trig source

Explain
Select sweep waveform Sine

Operation and Application

Square

Sawtooth

Triangle

Clipped-sine

Rectifier

Trapezoid

THD

User-defined

Set the running state after the sweep execution is finished: · off: Directly off the output after the execution is finished; · Last: Keep the last waveform unchanged after the execution is finished. Normal: return to normal mode after the sweep execution is finished.
Select the Trigger source: Manual Bus Trigger1 Trigger2

3. Press [On/Off] on the front panel and enable the output.
4. Press [Run] on the Sweep interface, Then the running status will be displayed on LCD. Output parameters and measurement parameters are displayed on the left side of the Sweep interface. You can also press the Meter to observe the output parameters in the main interface.
5. After sweeping, [On/Off] on the front panel will be off, and status will be displayed on LCD. You can press [Stop] on the Sweep interface to stop the Sweep function.

4.9 Power Amplifier
The IT7800 series regenerative grid simulator can be used as a power amplifier to complete power hardware in the loop (PHIL) applications for microgrids, energy storage and new energy vehicles. The digital I/O or a standard suite of analog signal can be input via an external analog interface (optional) and then amplified without distortion to a real power waveshape.
The power amplifier function can be implemented only when an external analog interface is configured. For details, see 5.14 Analogue Function (Ext- program).

4.10 Programmable Output Impedance
The function of programmable output impedance allows user to edit the output R and L so as to simulate the impedance of the AC grid.

48

Operation and Application
4.11 Polyphase Function
The IT7800 series power supplies implement the frequency-locked and phaselocked function between power supplies through the digital IO interface or System bus interface, which achieve 6 phase& 12 phase power output.
This power supply provides two ways to achieve multi-phase functionality:
One is to connect the System bus interface between instruments directly through fiber optic cable, no other connection is needed, the wiring is simple and convenient, this wiring method requires customers to purchase fiber optic module and fiber optic cable separately.
The other is via a digital IO interface, which requires no additional accessories and the instrument is connected by default.
Take the simulated 6-phase power supply as an example, and introduce the multi-phase function application method.
4.11.1 Connecting the DUT
When two IT7800 power supplies are combined in multiple phases, the outputs ABC are connected separately and the N wires of the two IT7800 power supplies need to be connected together as six-phase N wire terminals. The wiring schematic is shown below.

4.11.2 Connecting the System Bus Method
The two IT7800 power supplies are connected via the outer ring interfaces TX and RX in the System bus. Fiber optic connection method customers need to purchase fiber optic modules and fiber cables.
Connect the System Bus as shown in the diagram below for fiber optic communication between instruments.
1. Insert the fiber optic module into the hole corresponding to TX RX.

49

Operation and Application
2. Insert the plug of the fiber optic cable into the fiber optic module and hear a click sound to indicate that it is inserted in place. The fiber optic cable connection schematic is as follows.

Power Supply Configuration

1. Press [Shift] +

(System) and enter to the system menu interface.

2. Set the role of fiber control in the Source settings menu, you can choose one set as the Fiber-Phase-Master, the other set as the Fiber-Phase-Slave,
and the slave can choose the way to synchronize.

External Lockfrequency control

Set the external frequency lock function.

Status
Phase Delay Freq limit+

Enables or disables the external frequency lock function. Off/On Lock-Freq Lock-Phase Fiber-Phase-Master Fiber-Phase-Slave
Set the phase deviation between the output phase and the external I/O input signal: 0-360°.
Set the frequency difference upper limit between the output frequency and the external I/O input signal.

50

Freq limitException Sync select

Operation and Application
Set the frequency difference lower limit between the output frequency and the external I/O input signal. Set the output mode when the frequency lock fails: Output Disable: stop output Limit: Output according to the set
frequency. Synchronization mode selection (settable only in fiber slave mode). Local: The slave parameters take effect in real time. Fiber: The slave is controlled by the master fiber.

First instrument selection: Source -> External Lock-frequency control -> Status -> Fiber-Phase-Master
Second instrument selection: Source -> External Lock-frequency control -> Status -> Fiber-Phase-Slave
And then select Sync select to Local or Fiber.
When local is selected, the slave’s amplitude setting and modification will take effect in real time, without waiting for the host’s command.
When Fiber is selected, the slave’s amplitude setting does not take effect immediately and needs to wait for the host’s command.
When the host changes the parameters or changes the on/off status, the value set by the slave will take effect.

4.11.3 Connecting Digital I/O Method
Connect the IO-4 pins of two IT7900 power supplies. One IT7900 outputs synchronization signals to the other IT7900. The second power supply runs synchronously with the frequency and phase of the first power supply to realize the six-phase output function.The wiring diagram is as follows:

First

Second

Power Supply Configuration
Defining the digital IO-4 Pin User can define the IO function in IO configure menu.

3. Press [Shift] +

(System) and enter to the system menu interface.

4. Select I/O -> Digital IO-4: SYNC.

Set one IT7900 power supply as a synchronization signal output to Syncout, and the others set to Sync-out.

51

Operation and Application
Sync-in: Synchronous input function, which is used to output frequency lock or phase lock with the external signal. At this time, the machine synchronizes the frequency or phase information input from the IO-4 pin. Sync-out : Synchronous output function, the IT7900 produces synchronous signal to the outside, which is AC zero crossing pulse signal sent from the IO port. 5. Set the IO-5 function of the first power supply. Select I/O -> Digital IO-5: Onoff Status, set Reverse to Off, and set Function to OnOff-status.

6. Set the IO-1 function of the second power supply. Select I/O -> Digital IO1:Remote inhibit input, set Reverse to On, and set Function to Inhibit- Living.

NOTE
The IO-1 function of the second power supply must set according as above. Otherwise, the polyphase will be error.
Frequency and phase lock configuration
set frequency and phase synchronization Settings for the second power supply.

On the Source Settings menu, select External Lock-Frequency Control

->Status->Lock-Phase.

External Lockfrequency control

Set the external frequency lock function.

Enables or disables the external

Status

frequency lock function. Off/On Lock-Freq Lock-Phase Fiber-Phase-Master Fiber- Phase-Slave

Set the phase deviation between the

Phase Delay output phase and the external I/O

input signal: 0-360°.

Set the frequency difference upper

Freq limit+

limit between the output frequency

and the external I/O input signal.

Set the frequency difference upper

Freq limit-

limit between the output frequency

and the external I/O input signal.

Set the output mode when the

Exception

frequency lock fails: Output Disable: stop output Limit: Output according to the set

frequency.

Synchronization mode selection

(settable only in fiber slave mode).

Sync select

Local: The slave parameters take effect in real time.

Fiber: The slave is controlled by the

master fiber.

If in balance mode, the Phase Delay between the first instrument and the second intrument is set to 60° to achieve six-phase balanced output of 60° between six phases.

52

System-Related Functions
Chapter5

5.1 System Menu Reference

Press [Shift] +

(System) to enter the menu function. At this time, LCD

displays optional menus. Select and edit the menu items by pressing the Up,

Down, Left and Right keys. Specific menu items are shown below.

Voltage Source Menu:

System Voltage Source

Device operation mode
Phase mode

Output couple mode

Output impedance Off mode

Loop speed

External

Lock-

frequency control

Select the operation mode to Voltage Source.

Volt Source: Voltage source mode Current Source: current source mode

Set the power supply mode

1-Phase

Single mode

3-Phase

Three phase mode

Multi-Channel Reverse

Multi-channels mode Spilt phase mode

Set the output mode

AC

AC mode

DC

DC mode

ACDC

AC+DC mode

DCAC

DC+AC mode

Set the output impedance

Status

Enable or disable this function

R

Set the output resistance

L

Set the output inductance

Set the output turn off mode

Open-Z

Open circuit mode

High-Z

High impedance mode

Short

Short circuit mode

Output loop speed control

High Medium Low

High speed Medium speed Low speed

Set the external Lock-frequency control mode

Status Phase Delay

Set the Lock-frequency ON/OFF state Off/On Lock-Freq Lock-Phase Fiber-Phase- Master Fiber-Phase-Slave
Set the phase deviation between the output phase and the external I/O input signal: 0-360°.

53

External programme
Remote sense On/Off phase Measurement

Freq limit+ Freq limitException
Sync select

System-Related Functions
Set the frequency difference upper limit between the output frequency and the external I/O input signal.
Set the frequency difference lower limit between the output frequency and the external I/O input signal.
Set the output mode when the frequency lock fails: Output Disable: stop output Limit: Output according to the
set frequency.
Synchronization mode selection (settable only in fiber slave mode). Local: The slave parameters take effect in real time. Fiber: The slave is controlled by the master fiber.

External analog function:

Status

Set the ON/OFF state

AM: Adjust the amplitude

Mode

Amplifier: Real-time output and

power Amplifier.

Select the phase to monitor.

Monitor phase This cannot be set in single phase

mode.

U ratio

The external program ratio of voltage.

I ratio

The external program ration of current.

Set the sense function state.

On: Enable the remote sense

Mode

Measurement

Off: disable the sense function

On-mode

Output on phase control Phase: setting the phase Imm: immediately Slope: Controlled according to

the set slope

Off-mode

Output off phase control Phase: setting the phase Imm: immediately Slope: Controlled according to

the set slope

Set the measurement speed

Lowest (1Hz)

Lowest mode, measuring every 2s

Lower (1000ms)

Lower mode, measuring every 1000ms

Slow (500ms)

Slow mode, measuring every 500ms

Medium (300ms)

Medium mode, measuring every 300ms

Fast (150ms)

Fast mode, measuring every 150ms

54

Power Unit Setting

System-Related Functions

Filter

Whether to turn on the filter during measurement.

Unit of power, can be set to KW/kVA/KVar or W/VA/Var.

Current Source Menu:

System Current Source

Device operation mode Phase mode
Output couple mode
Output impedance
Off mode

Select the operation mode to Current Source.

Current Source

Set the power supply mode

1-Phase

Single mode

Reverse

Spilt phase mode

Set the output mode

AC

AC mode

ACDC

AC+DC mode

Set the output impedance

Status

Enable or disable this function

R

Set the output resistance

L

Set the output inductance

Set the output turn off mode

Open-Z

Open circuit mode

Loop speed

External

Lock-

frequency control

High-Z

High impedance mode

Short

Short circuit mode

Output loop speed control

High

High speed

Low

Low speed

Set the external Lock-frequency control mode

Status
Phase Delay Freq limit+ Freq limitException Sync select

Set the Lock-frequency ON/OFF state Off/On Lock-Freq Lock-Phase Fiber-Phase- Master Fiber-Phase-Slave
Set the phase deviation between the output phase and the external I/O input signal: 0-360°.
Set the frequency difference upper limit between the output frequency and the external I/O input signal.
Set the frequency difference lower limit between the output frequency and the external I/O input signal.
Set the output mode when the frequency lock fails: Output Disable: stop output Limit: Output according to the
set frequency.
Synchronization mode selection (settable only in fiber slave mode).

55

External programme
Remote sense On/Off phase Measurement
Power Unit Setting

System-Related Functions
Local: The slave parameters take effect in real time. Fiber: The slave is controlled by the master fiber.

External analog function:

Status

Set the ON/OFF state

AM: Adjust the amplitude

Mode

Amplifier: Real-time output and

power Amplifier.

Select the phase to monitor.

Monitor phase This cannot be set in single phase

mode.

U ratio

The external program ratio of voltage.

I ratio

The external program ration of current.

Set the sense function state.

On: Enable the remote sense

Mode

Measurement

Off: disable the sense function

On-mode

Output on phase control Phase: setting the phase Imm: immediately Slope: Controlled according to

the set slope

Output off phase control Phase: setting the phase

Off-mode

Imm: immediately Slope: Controlled according to

the set slope

Set the measurement speed

Lowest (1Hz)

Lowest mode, measuring every 2s

Lower (1000ms)

Lower mode, measuring every 1000ms

Slow (500ms)

Slow mode, measuring every 500ms

Medium (300ms)

Medium mode, measuring every 300ms

Fast (150ms)

Fast mode, measuring every 150ms

Filter

Whether to turn on the filter during measurement.

Unit of power, can be set to KW/kVA/KVar or W/VA/Var.

General Menu:
Buzzer

General

Brightness

Set the keyboard sound.

Key Protect

Buzzer on/off for key Buzzer on/off for protect

Set the screen brightness.

1-10

Set the screen brightness level

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Factory-defaultsettings Power-on setup
Parallel mode
Touch function Knob immediately effective Language Soft keyboard

System-Related Functions

Select whether to reset the factory default settings or

not.

Enter

Confirm to reset operation

Set the power-on state.

When the instrument is powered

Reset

on, the instrument will initialize

some settings and [On/Off] state.

When the instrument is powered

on, the instrument will remain

Last

the same settings and [On/Off]

state as last time

you turned off the instrument.

When the instrument is powered

on, the instrument will remain

Last-OFF

the same settings as last time you

turned off the instrument,

but the [On/Off] is OFF state.

Set the instruments to parallel operation mode.

Master: Set the instrument to

master mode.

Single: Set the instrument to single

Role

mode, i.e., disable the parallel operation mode. Slave: Set the instrument to

slave mode.

Numbers

Number of parallel instruments.

Lock the touch screen function

Status

Set the ON/OFF state

Knob setting will take effect immediately. If set to ON,

the Knob setting will take effect immediately. If set to

OFF, press ENTER to confirm the effect after the Knob

setting is completed.

Set the language of display

English

Chinese

Set the soft keyboard

On

Turn on the soft keyboard.

Off

Turn off the soft keyboard.

Communication Menu:
USB type
USB device class Communication
LAN config

Set the USB type.

Device: the USB device is used to communication with PC.

Host: the USB device is used to storage disk.

USB communication interface

VCP

Virtual serial port

TMC usbtmc

USB-TMC protocol

LAN communication interface

DHCP: automatically configure

Mode

the address of the instrument. Manual: manually configure

the address of the instrument

57

System-Related Functions

by entering values in the

following five fields.

IP

Set the IP address.

Mask

Set the subnet mask.

Gateway

Set the gateway address.

Port

Set the port number.

CAN Config

Baud rate

Addr

Address

RS232 config

Select RS-232 communication interface. When insert IT-E177 communication board into expansion slot,

the menu displays this information.

Baud rate

Databits

Data bit: 5/6/7/8

Stopbits

Stop bit: 1/2

Parity bit: N (No parity) / E (Even

Even-odd check parity) / O

(Odd parity)

Addr

Address

Select GPIB communication interface. When insert IT-

GPIB config

E176 communication board into expansion slot, the

menu displays this information.

Addr

Set the communication address

Digital IO-1:Remote Inhibit Input

Function setting of pin 1

Reverse

On/Off, Select Invert or not under the IO Settings. If setting to ON, it

Function

means the valid signal is reversed. Inhibit-living Inhibit-latch Input
Output

Digital IO-2: PS Clear

Function setting of pin 2

On/Off, Select Invert or not under

Reverse

the IO Settings. If setting to ON, it

means the valid signal is reversed.

PS Clear

IO

Function

Input Output

Digital IO-3: PS

Function setting of pin 3

On/Off, Select Invert or not under

Reverse

the IO Settings. If setting to ON, it

Function

means the valid signal is reversed. PS Input Output

Digital IO-4: SYNC Function setting of pin 4

On/Off, Select Invert or not under

Reverse

the IO Settings. If setting to ON, it

Function

means the valid signal is reversed. Sync-in Sync-out Input
Output

58

Digital IO-5: ON/OFF Status Digital IO-6: Trigger1
Digital IO-7: TRIG2

System-Related Functions

Function setting of pin 5

Reverse Function

On/Off, Select Invert or not under the IO Settings. If setting to ON, it means the valid signal is reversed.
ON/OFF Status Input Output

Function setting of pin 6

On/Off, Select Invert or not under

Reverse

the IO Settings. If setting to ON, it

Function

means the valid signal is reversed. Trigger1-out Trigger1-in Input
Output

On/Off: When On is selected, a

trigger signal is output when AC

amplitude changes. The accuracy

AC

of voltage change is 100mV and is not restricted by phase.

(This configuration is displayed

only when the IO function is set to

Trigger1-out)

On/Off: When On is selected, a

trigger signal is output when the

DC amplitude changes, and the

DC

voltage change precision is 100mV.

(This configuration is displayed

only when the IO function is set to

Trigger1-out)

On/Off: When On is selected, a

trigger signal is output when the

frequency changes.The accuracy

Freq

of frequency change is 0.1Hz

(This configuration is displayed

only when the IO function is set to

Trigger1-out)

On/Off: When On is selected, a

trigger signal is output when the

List

List generates a trigger signal. (This configuration is displayed

only when the IO function is set to

Trigger1-out)

Function setting of pin 7

Reverse

On/Off

Trigger1-out

Fun

Trigger1-in Input

Output

On/Off: When On is selected, a

AC

trigger signal is output when AC

amplitude changes. The accuracy

59

Information

Product model Serial number Software version MAC address Rbf Version Ctrl1 version Ctrl2 version Hardware version Inner numbers

System-Related Functions

of voltage change is 100mV and is

not restricted by phase.

(This configuration is displayed

only when the IO function is set to

Trigger2-out)

On/Off: When On is selected, a

trigger signal is output when the

DC amplitude changes, and the

DC

voltage change precision is 100mV.

(This configuration is displayed

only when the IO function is set to

Trigger2-out)

On/Off: When On is selected, a

trigger signal is output when the

frequency changes.The accuracy

Freq

of frequency change is 0.1Hz

(This configuration is displayed

only when the IO function is set to

Trigger2-out)

On/Off: When On is selected, a

trigger signal is output when the

List

List generates a trigger signal. (This configuration is displayed

only when the IO function is set to

Trigger2-out)

Pulse Width

Range: 30us-500us

Display the instrument model.

Display the serial number.

Display the control board version.

MAC address

Rbf version

Ctrl1 version

Ctrl2 version

Hardware version

The inner numbers setting item is required when using

F-TX and F-RX fiber to achieve master-slave model

parallel.

5.1.1 Menu function
Set OFF Mode Status
This parameter is used to set the status after the power output is off.
Select to High-Z, After the power output is Off, the dc impedance between the terminals of the power supply is high, and the resistance value varies with different models.
Select to Short, When the power output is Off, the terminals of the power supply are short-circuited, the voltage is 0.
Select to Open-Z, After the power output is Off, the power supply is in open mode, and the internal circuit and external load of the power supply are disconnected by relay.

60

System-Related Functions
Set the buzzer
This item can set the key sound state. If in ON mode, then when you press a button or occur protection, the power supply will beep. If in OFF mode, the beeper will not make a sound. The default set is in ON mode.
Set the screen brightness
This item can set the screen brightness. Set the screen brightness within the range 1 to 10 by pressing number keys on the front panel. The larger the number is, the higher the screen brightness is. You can also set the screen brightness by rotating the knob on the front panel.
Restored to Factory Setting
This menu item is used to restore some parameter settings to factory setting values.
The procedures to set the menu item are as follows.
1. Select the General under system menu. 2. Press Enter in Factory_default_settings. After the parameter settings are
complete and return to main interface.
Set the Power-on State
This parameter determines the state of the AC source after power up.
The procedures to set the menu item are as follows.
1. Press the General under the system menu. 2. Press the Up/Down key or turn the knob to select the Power-on setup and press [Enter]. Reset: Default value, indicates when the instrument is powered on, the
instrument will initialize some parameter settings or state. Last: Indicates when powered on, the instrument will remain the same
parameter settings and output status as last time you powered off the instrument. Last+Off: Indicates when powered on, the instrument will remain the same settings as last time you powered off the instrument, but the output status is Off.
Lock the Touch Screen
This parameter determines the state of the touch screen.
1. Press the General under the system menu.
2. Press the Up/Down key or turn the knob to select the Touch screen lock and press [Enter]. On: enable the touch screen Off: disable the touch screen
Set the Loop Speed
This item can control stability of the loop. When the connected load is capacitive load or inductive load, select Slow; when the connected load is resistance, select High.

61

System-Related Functions
Set the Knob Function
Set the knob setting function. If set to ON, the Knob setting will take effect immediately. If set to OFF, press Enter to confirm the effect after the Knob setting is completed.
Select Language
Users can select the instrument language type from the menu, supporting Chinese and English.
Set the Soft Keyboard
The user can open the soft keyboard in the menu. When the parameter is set to ON, the soft keyboard is enabled. And when setting parameters on the screen, the soft keyboard appears. Convenient users directly touch screen to select the number.
5.1.2 Set the communication interface
This menu item is used to set the communication information between instrument and PC. The standard communication interfaces for IT7800 series power supply are USB, LAN and CAN. You can also select the non-standard interface GPIB or RS-232 based on personal requirement.
The user does not need to select the communication interface. The instrument will automatically select the present communication mode according to the communication interface accessed by the rear panel.The user only needs to set the communication parameters and keep them consistent with the PC Settings.
NOTE
When select USB interface, the USB type need to be DEVICE.
The instrument supports the non-standard RS-232 and GPIB interfaces, and the configuration items in the menu are dynamically displayed according to the interface user selected
5.1.3 View the System Information
System Information menu is used to view the system information of the instrument. Include product model, SN, software version and MAC address.

5.2 Configuration Menu Reference
Press [Config] key and enter to configuration menu interface. At this interface, user can setup the power supply output parameters, detailed parameters are shown as follows:

DC Config
DC+AC Config

Configuration setting for DC mode

Voltage DC

Vdc: Output voltage of DC, range from 0full scale Slew Rate: Slope , range from 0.00015000V/ms

Configuration setting for DC+AC mode.

Output voltage of DC, range from 0-full

Voltage DC

scale Slew Rate: Slope , range from 0.0001-

5000V/ms

Ripple control

Wave: Select the output wave type

62

AC Config
AC+DC Config

System-Related Functions
Vac: output voltage of AC, range from 0-full scale Freq: frequency value

Configuration setting for AC mode

Balance control
Voltage AC Frequency Phase control Waveform Dimming

Only displayed in 3-phase mode. Balance control in 3-phase mode. If select On, the output of ABC phase is
synchronous. If select Off, the output is not balanced.
Output voltage Vac: output voltage of AC, range from 0-full scale Slew Rate: Slope , range from 0.00015000V/ms
Freq: output frequency, range from 162400Hz Slew Rate: slope, range from 0.0000150000Hz/ms
Phase difference between AB and AC, only valid in balance control is Off state. AB: Phase difference between A and B. AC: Phase difference between A and C.
Selece and edit the output wave type. For detailed introduction please refer to 4.3 waveform selection.
Status: Dimming function switch. Edge: select front edge or back adge Phase: phase control, range from 0-180°

Configuration setting for AC+DC mode

Balance control
Voltage AC Voltage DC Frequency Waveform Dimming

Only displayed in 3-phase mode. Balance control in 3-phase mode. If select On, the output of ABC phase is
synchronous. If select Off, the output is not balanced.
Output voltage Vac: output voltage of AC, range from 0-full scale Slew Rate: Slope , range from 0.00015000V/ms
Output voltage of DC, range from 0-full scale Slew Rate: Slope , range from 0-5000V/ms
Freq: output frequency, range from 162400Hz Slew Rate: slope, range from 0.000015000Hz/ms
Selece and edit the output wave type. For detailed introduction please refer to 4.3 waveform selection.
Status: Dimming function switch. Edge: select front edge or back adge Phase: phase control, range from 0-180°

63

Current Source Mode:

System-Related Functions

AC Config
AC+DC Config

Configuration setting for output.

Current AC
Frequency Waveform Dimming

Output current. Iac: output current of AC, range from 0-full scale Slew Rate: Slope , range from 0.00015000A/ms
Freq: frequency of output, rang from 162400Hz Slew Rate: slew rate of frequency, 0.00001-5000Hz/ms
Selece and edit the output wave type. For detailed introduction please refer to 4.3 waveform selection.
Status: Dimming function switch. Edge: select front edge or back adge Phase: phase control, range from 0-180°

Configuration setting for output.

Current AC
Current DC
Frequency Waveform Dimming

Output current. Iac: output current of AC, range from 0-full scale Slew Rate: Slope , range from 0.00015000A/ms
Idc: DC current value, range from 0-full scale Slew Rate: slew rate, 0-5000A/ms It is not displayed in three-phase balanced mode, if you need to set the three-phase DC component, balanced mode needs to be turned off.
Freq: frequency of output, rang from 162400Hz Slew Rate: slew rate of frequency, 0.00001-5000Hz/ms
Selece and edit the output wave type. For detailed introduction please refer to 4.3 waveform selection.
Status: Dimming function switch. Edge: select front edge or back adge Phase: phase control, range from 0-180°

Balance Control Setting
In three-phase mode, the instrument is in three-phase balance mode by default, and the three-phase output voltage will be set synchronously, and the phase Angle between phases is fixed at 120°, which cannot be set.
You can set the Balance Control to Off and disable the Balance control function in the Config menu. And then, the voltage of each phase can be set independently, and the config menu displays the phase Angle difference setting parameter between AB and AC.

64

Dimming Function

System-Related Functions

The front and back edge of the waveform can by concealed and the phase angle set with Dimmer function to regulate the active power, thus adjusting the lighting intensity.

Select Front edge, and phase set to 90° in Configuration menu.

Select Back edge, and phase set to 90° in Configuration menu.

5.3 Key Lock Function
Press [Shift] + [2] (Lock) button to set the key lock state. If keyboard has been locked, the indicator light “Lock” will display on the LCD. In addition, when the keyboard are locked, all buttons can’t be used, Press [Shift] + [2] (Lock) once again will relieve key lock function.

65

System-Related Functions
5.4 Switching Local/Remote Mode
You can press the [Shift] +[3] (Local) button to change the AC source from remote to local operation.
After you power on the AC source, it defaults in local mode, all buttons are enabled. While in remote mode, most buttons are disabled except [Shift] +[3] (Local) keys. You can switch Local/Remote mode via PC. In addition, the mode modification will not affect the output parameters.
5.5 Save and Recall Operations
The power system can save up to 10 common parameters in nonvolatile memory (No. 1 to No. 10) for user to recall conveniently.
The saved parameters include: Power supply mode Present output mode Config menu settings You can do the save and recall operations by the following two methods. Press the composite keys [Shift]+[4] (Save) to save the parameters.
Pressthe composite keys [Shift]+[5] (Recall) to recall the parameters. SCPI commands: SAV and RCL
Save Operation
The save operation procedures are as follows:
1. Press the composite keys [Shift]+[4] (Save) to enter the parameter save interface.
2. Select the storage location. up to 10 position can be select.

3. Press [Enter] to save the parameters. Finished, the saved parameters will be display at the bottom of the interface.

Recall Operation

You can recall the parameters you saved in the specified memory location as

66

the setting values.

System-Related Functions

1. Press the composite keys [Shift]+[5] (Recall) to enter the parameter recall interface.

2. Set the storage location.

Press the direction keys to set the storage location, and then, the saved parameters will be display at the bottom of the interface.

3. Press [Enter] to recall the parameters.

5.6 Protection Function
IT7800 series source includes the following protection functions: overcurrent protection (Current RMS protection, Current peak protection), voltage limit protection and over-temperature protection (OTP).

AC/ACDC Mode

Press [Shift]+[Config] (Protect) and enter to Protect configure menu, where you can set the following protection.

Current RMS protection
Current peak protection Voltage max protection Voltage peak range

RMS current for OCP protection

Rms

Protection point

Time

delay time of protection

Type

Protection type.

Limit

Output Disable

Current Peak OCP

Peak

Protection point

Time

delay time of protection

Voltage max protection

Max

Max voltage

Time

delay time of protection

Voltage limit setting

V limit

Maximum voltage setting

Power limit range

Power limit setting

P limit

Power limit point

Time

delay time of protection

Type

Protection type.

Limit

Output Disable

Current Source mode: Current Limit range
Voltage Limit range
Power Limit range

Current limit range

Mode

Can not be set.

Time

Delay time, range from 0s-10s.

I-High

Current high value

I-Low

Current low value

Voltage limit range

Mode

Can not be set

Time

Delay time, range from 0s-10s.

V-High

Voltage high value

V-Low

Voltage low value

Power limit range

Mode

Can not be set

67

Time P-High P-Low

System-Related Functions
Delay time, range from 0s-10s. Power high value Power low value

DC/DCAC Mode

Press [Shift]+[Config] (Protect) and enter to Protect configure menu, where you can set the following protection.

Current limit range

Voltage

max

protection

Voltage limit range

Power limit range

Current limit setting

I+ limit

Maximum current setting, the

current setting will be limited to

this range.

I- limit

Minimum current setting, the

current setting will be limited to

this range.

Voltage max protection

Max

Max voltage

Time

delay time of protection

Voltage limit setting

V+ limit

Maximum voltage setting, the

voltage setting will be limited to

this range.

V- limit

Minimum voltage setting, the

voltage setting will be limited to

this range.

Power limit setting

P+ limit

Maximum power setting, the

power setting will be limited to this

range.

P- limit

Minimum power setting, the power

setting will be limited to this range.

5.6.1 Current RMS Protection
The user can set the over-current protection point, delay time and protection type for the Current RMS protection function. The function is mainly used to protect the DUT connected during test to prevent it from damage due to overcurrent. The OCP (rms) function is always enabled.
RMS OCP Type:
Limit: If the output current reaches the RMS current protection point, the protection will be activated. The power supply output current is controlled within the current limiting value. The power supply will output in current limit mode.
Output Disable: When the output current reaches the over-current protection point and the period is greater than the set protection delay time, the over- current protection (rms) will turn off the output.

How to Set

1. Press [Shift]+[Config] (Protect) keys and enter to Protection menu.

2. Press the up/down key or rotate the knob to select Current RMS protection and press [Enter].

3. Set the protection RMS Level, the delay time and protection type in

68

sequence, and press [Enter] to confirm.

System-Related Functions

Clear RMS OCP Protection
When RMS OCP protection occurs, the instrument responds as follows:
Instrument output is off; The buzzer sounds; The interface displays “OCPrms” and flashes
To clear the RMS OCP and return to normal operation, firstly remove the conditions that caused the protection fault. Press [Shift] +[Esc] key (or send the command PROTect:CLEar) to clear the protection status. The message displayed in front panel is cleared and the instrument exits protection status.
5.6.2 Set the Current Peak protection
The user can set the current peak protection point and delay time for the Current peak protection function. The function is mainly used to protect the DUT connected during test to prevent it from damage due to over load. The OCP peak function is always enabled.

How to Set

1. Press [Shift]+[Config] (Protect) keys and enter to Protection menu.
2. Press the up/down key or rotate the knob to select Current peak protection and press [Enter].
3. Set the protection peak Level and the delay time in sequence, and press [Enter] to confirm.

Clear Peak OCP Protection
When peak OCP protection occurs, the instrument responds as follows:
Instrument output is off; The buzzer sounds; The interface displays “OCPpeak” and flashes
To clear the peak OCP and return to normal operation, firstly remove the conditions that caused the protection fault. Press [Shift]+[Esc] key (or send the command PROTect:CLEar) to clear the protection status. The message displayed in front panel is cleared and the instrument exits protection status.

5.6.3 Set Voltage/Current/Power Limit Range
The maximum voltage, current and power of the power supply ranges from minimum to full-rated output range. You can setting maximum and minimum values of power supply voltage/current/power in the protection menu. When limit setting is finished, the voltage setting value, current setting value and power setting value can only be set within the maximum and minimum limits.

Limit factory setting is the rated output voltage/current/power of corresponding model of the power supply. Minimum is 0.

Take the voltage limit setting for an example, the operating as follows:

1. Press [Shift]+[Config] (Protect) keys and enter to Protection menu.

2. Press the up/down key or rotate the knob to select Voltage limit range and press [Enter].

3. Set the V+ limit and the V- limit in sequence, and press [Enter] to confirm.

69

System-Related Functions
5.6.4 Over-temperature protection (OTP)
When the temperature of the power component in the power supply exceeds 95°C, the temperature protection will be enabled. In this case, the power supply

will be automatically OFF, and the LCD will display . At the same time, the OT position in the status register will be set and kept until power supply is reset.

Clearing over-temperature protection:

When the power supply temperature decreases to the protection temperature, press [Shift]+[Esc] key on the front panel (or send the command

“PROTect:CLEar”). Then

on the power supply screen will disappear, and

the power supply will exit the OTP status.

5.6.5 Over-power protection (OPP)

When the output power exceeds the set power, OPP will be enabled, and will appear on the LCD screen.

Clearing over-power protection:

In the case of over-power protection, disconnect the tested object at first. Press [Shift]+[Esc] on the front panel (or send the command “PROTect:CLEar”) to

clear

on the front panel and exit the OPP mode.

5.7 Screen Capture Function
IT7800 series power supply has the screen capture function. Insert the USB disk into the USB interface of the front panel, and press [Print] on the front panel to capture and save the current screen into the USB disk.
When you need the screen capture function, the USB type under the system menu needs to be set to Host. And the USB interface of real panel can not be connected.

5.8 Trigger Function
IT7800 series has four trigger source to choose: trigger by keys (Key), Software trigger (Software), Bus trigger (Bus) and External signal trigger (External).
Manual: if [Trig] on the front panel is pressed in the valid key trigger mode, the power supply will be triggered once.
Bus: if the bus trigger command is received by the power supply in the valid bus trigger mode, the power supply will be triggered once.
Trigger1: if one trigger signal is connected to the Digital IO-6 of digital I/O Interface terminal on the rear panel, the power supply will be triggered once.
Trigger2: if one trigger signal is connected to the Digital IO-7 of digital I/O Interface terminal on the rear panel, the power supply will be triggered once.

5.9 Query the System Log
The IT7800 series power supply provides the system operation Log query function. On the Menu interface of the front panel of the instrument, click Log or directly press Shift +1[Log] to enter the Log query interface. You can view historical system operation records on this screen.

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5.10 Query the Energy
IT7800 series power supply provides the energy statistics function. Click WHours button in the Menu interface of the front panel of the instrument to enter the quantity query interface. You can view power statistics on this screen. Positive electrical energy: Statistical value of output power by the current
phase as a power supply Negative electrical energy: Statistical value of sink power by the current
phase as a load Total positive electrical energy: Statistical value of output power by the three
phases in total Total negative electrical energy: Statistical value of sink power by the three
phases in total
5.11 Set Parallel Operation Mode
The IT7800 series power supply supports multiple instruments to work in parallel mode to provide more power and current output capability. Under the parallel mode, All features are set up from the master unit.
This chapter takes three instruments (with operation panel) as an example to describe how to parallelize the single units and how to return from parallel mode to single mode.
Connect the instruments (3U model)
Before connecting the system bus, you must ensure that each instrument is in single mode (Single).
Fiber optic cables cannot be flexed or folded. When the cable is too long and needs to be arranged, gently wrap the cable in a circle and gently tie it.

Before connecting the cables, ensure that the instrument power switch is off and the main switch of the AC power input (distribution box) is off.
Before connecting 3 single instruments to the AC distribution box, ensure that the distribution box capacity is sufficient. Refer to the corresponding specifications for the AC input parameters of a single instrument.
For 3U models, the same model can be connected in parallel. Taking three 3U single instruments (with operation panel) as an example, the steps for parallel operation are as follows.
1. Ensure that the power switches of the three units and the main switch of the AC power distribution box are off.
2. Refer wiring connection diagram to connect three units.

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3. Connect the AC input terminals of the three units separately, and connect them to the AC distribution box.
4. Connect the output terminals of the three units in parallel and connect them to the DUT.
5. Refer to the blue wiring legend in the figure, connect the System Bus (i.e., the fiber outer ring interfaces TX and RX) for fiber-optic communication between the master and slaves.
a) Insert the fiber optic module into the hole corresponding to TX RX.
b) Insert the plug of the fiber optic cable into the fiber optic module and hear a click sound to indicate that it is inserted in place. The fiber optic cable connection schematic is as follows.

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Set the Parallel Mode
1. Turn on the main switch of the AC distribution box and power on each of the three units.
2. Set three units in parallel mode with one master and two slaves.

3. Press the composite keys [Shift]+ enter the system menu.

(System) on the front panel to

4. Select General menu.

5. Set the Parallel Mode, set them to one master unit and two slave units. In each group, one instrument must be the master unit and all other instruments
connected in parallel are slave units. All features are set up from the master
unit.

Single: Default value, indicates that the instrument is in single mode. Master: Indicates that the single unit is set to master in parallel mode.
Numbers: total number of units in the parallel relationship, when the instrument set to master, you need to set the Numbers. For example, Numbers set to 3.
Slave: Indicates that the instrument is set to the slave in parallel mode.
6. After the parallel menu of the three units are set, restart the instrument separately.

After the instrument is restarted, the screen shows that the instrument is working in parallel mode.

Revert to Single Mode
1. Set each of the three instruments to single mode.

2. Press the composite keys [Shift]+ enter the system menu.

(System) on the front panel to

3. Select General menu.

4. Set the Parallel Mode, set them to single.

5. Power off the three instruments and turn off the main switch of the AC distribution box.

6. Remove the cables connection of the System Bus and output terminals between three units.

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7. Power on the three instruments separately.

System-Related Functions

After the instrument is restarted, the screen shows that the instrument is working in single mode.

Connect the instruments (Cabinet model)

Before connecting the system bus, you must ensure that each instrument is in single mode (Single).
Fiber optic cables cannot be flexed or folded. When the cable is too long and needs to be arranged, gently wrap the cable in a circle and gently tie it.

Before connecting the cables, ensure that the instrument power switch is off and the main switch of the AC power input (distribution box) is off.
Before connecting 3 single instruments to the AC distribution box, ensure that the distribution box capacity is sufficient. Refer to the corresponding specifications for the AC input parameters of a single instrument.
For cabinet models, the same model can be connected in parallel. Taking two 15U instruments (with operation panel) as an example, the steps for parallel operation are as follows.
1. Ensure that the power switches of the instrument and the main switch of the AC power distribution box are off.
Refer wiring connection diagram to connect two units.
The configuration method is the same as 3U model instrument.

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Notice:
The connection cables from the cabinet terminals to the mid-node are as short as possible and bundled up after the connection is completed. The cable length from the two cabinets must be the same.
Connect TX, RX fiber cable of two cabinets for communication, connected in the same way as a 3U model instrument.
Each cabinet has a red role selection button that allows the user to switch the red button to select the present instrument as a master or as a slave.

When paralleling as a master role, several cabinets in parallel need to be powered on or powered down separately.
When parallel as a slave role, the present slave cabinet up and

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down power to follow the host operation, at this time the slave cabinet and the master cabinet need to connect the CTRL interface. The wiring method is shown in the figure below.

5.12 Remote Measurement Function
The IT7800 series power supply supports two connection methods: Local measurement and Remote sensing. The remote sensing is used for maximizing measurement accuracy. (Refer to 2.5 Connecting Test Lines).
The procedures to set the menu item are as follows.

1. Press the composite keys [Shift] + enter the system menu.

(System) on the front panel to

2. Press the up/down key or rotate the knob to select Source and press [Enter].

3. Press the up/down key or rotate the knob to select Remote Sense compensation and press [Enter].

Off: Default value, indicates turn the sense function off. On: Indicates turn the sense function on. 4. After the parameter settings are complete, press [Enter].

5.13 Digital I/O Function
This series power supply supports digital I/O function. The user can realize logic control over high and low level input or output by related configurations in the system menu.
Pins Introduction
Different I/O implements different functions. The detailed functions description are shown in the figure below:
Digital-IO

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Pin Digital IO-1

Type Input/Output

Description

Properties

Inhibit, Turn off the output Level signal under emergency status

Digital IO-2 Digital IO-3 Digital IO-4 Digital IO-5
Digital IO-6 Digital IO-7

Input/Output Input/Output

Ps-clear, Clear the protection Pulse signal state
PS, Protection state indicator Level signal

Input/Output Sync, synchronous control Pulse signal

Input/Output Input/Output

OnOff-status, OnOff-status indicator Trigger1

Level signal Pulse signal

Input/Output Trigger2

Pulse signal

Ground terminal, that is, the negative terminal corresponding to each of the above 7 pins.

General Digital I/O Function
Signal definition
Digital I/O functions involve input and output levels and pulse signals.The input signal is the control signal provided externally to IT7800, the output signal is the level signal provided externally by IT7800, and the pulse signal is the edge signal switched between high and low levels.

Typical: 5V

High level signal Range: 1.6V-15V

Input signal

Current: 100mA Low level signal Typical: 0V

Range: -5V-0.8V

Current: 100mA

High level signal Voltage level: 5V

Output signal

Current: 1mA Low level signal Voltage level: 0V

Current: 0.5mA

Level rise slope 10us

Pulse

Level fall slope 2us

Width

User defined, range: 30us-500us

Input/Output Function The IO-1 ~ IO-7 pins are featured default function, the user can setting the

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function of pin according to requirement. The Input and Output are the general digital I/O function, and the parameter settings and functions of the seven pins are the same. The IO-1~IO-7 pins provide default functions. Users can realize control according to the functions defined. Users can also reset the input or output properties of the present pin and customize the function use of the pin according to their needs. When pins 1 to 7 are configured to Output function, when send the command (IO:STATe <1~7>,<0|1>) to instrument, the IO pin can output high level (False) or low level (True). When pins 1 to 7 are configured to Input function, an external signal can be Input to this pin, and the instrument can detect the state of the external signal.
Signal Revert
Select Invert or not under the IO Settings menu. If setting to OFF, it means the default level will be valid. If setting to ON, it means the valid signal is reversed. For example, the IO-1 pin is inhibit output by default and the high level is valid, when select revert ON, the low level is valid and the instrument output is disabled.

Digital IO-1

IO-1 pin can be set to Inhibit-latch,Inhibit-living, Input, Output
The default function is inhibit output. When the IO pin is configured for a Inhibit function and the level signal is low, the output of the machine is forbidden. At this point, Pin 1 has a bi-directional I/O function, which can both receive the level signal input from the external instrument and output the level signal outward.default level is high, and low is valid when entering. Outgoing output also generates low level signals.
Inhibit function has two mode: Latch and Living.
Living: When input an inhibit signal and the instrument output is turned OFF. The status bar of the LCD screen displays INH warning icon and the output is marked as OFF. If power supply output is ON state before, the ON/OFF button will be lit. When the input signal undoes, the output returns to normal. This function can be used to control the output of the power supply.
Latch: When input an inhibit signal and the instrument output is turned OFF. The ON/OFF button will be lighted off, the status bar of the LCD screen displays INH warning icon. In this case, user need to remove the input signal and press [Shift]+[Esc] to clear protection, then manually turn on [On/Off] again.

Digital IO-2

IO-2 pin can be set to PS-clear, Input, Output
The default function is to clear the protected state. When the protection occurs, the protection state can be cleared through this pin, so that the instrument can continue to output normally.
IO-2 is bi-directional, that is, when the power supply is in a protected state, the instrument can receive a pulse signal from an external input through IO-2 for clean protection operation, or when the power supply is in a protected state, the clean protection can generate a pulse signal from IO-2.

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Digital IO-3

System-Related Functions
IO-3 pin can be set to PS, Input, Output
The default function is protection state indicator. IO-3 pin will output high or low level based on whether the instrument is under protection or not. Under normal conditions (Not under protection), and when pin3 is under default setting (Not Invert), pin 3 outputs high