ITECH Electronic Co Ltd IT7900P Programmable AC Power Supply User Manual

: June 13, 2024
: ITECH Electronic Co Ltd

Table of Contents

IT7900P Programmable AC Power Supply
Product Information
Product Usage Instructions
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IT7900P Programmable AC Power Supply

Product Information

Product Name: Programmable AC Power Supply

Model: IT7900P

Version: V1.1/2023.09

Manufacturer: Itech Electronic, Co., Ltd.

Manual Part Number: IT7900P

Revision: 1st Edition: SEP. 16, 2023

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.

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.
A NOTE sign denotes important hint. It calls attention to tips
or supplementary information that is essential for users to refer
to.

Quality Certification and Assurance:

We certify that IT7900P series power supply meets all the
published specifications at time of shipment from the factory.

Product Usage Instructions

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).

Warranty Service or Repair:

If warranty service or repair is required, the product must be
returned to a service center designated by ITECH.

The product returned to ITECH for warranty service must be
shipped PREPAID. ITECH will pay for the return of the product to
the 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 the 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;

Programmable AC Power Supply
IT7900P Series User Manual
Model: IT7900P Version: V1.1/2023.09

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
IT7900P
Revision
1st Edition: SEP. 16, 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

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.

IT7900P User Manual

Quality Certification and Assurance
We certify that IT7900P 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

IT7900P 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 (grounding) conductor or

IT7900P User Manual
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.

iii

IT7900P User Manual
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.
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.

IT7900P 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

Content

Overview

Quality Certification and Assurance…………………………………………………………………………………………………………….i Warranty …………………………………………………………………………………………………………………………………………………i Limitation of Warranty ………………………………………………………………………………………………………………………………i Safety Symbols …………………………………………………………………………………………………………………………………………i Safety Precautions……………………………………………………………………………………………………………………………………ii Environmental Conditions………………………………………………………………………………………………………………………..iii Regulatory Markings ………………………………………………………………………………………………………………………………. iii Waste Electrical and Electronic Equipment ( WEEE) Directive ………………………………………………………………………. iv Compliance Information …………………………………………………………………………………………………………………………..v

Chapter1

Overview ………………………………………………………………………………………………………………………. 9

1.1 Brief Introduction……………………………………………………………………………………………………………………………….9 1.2 Models and Options………………………………………………………………………………………………………………………….11 1.3 Optional accessories …………………………………………………………………………………………………………………………11 1.4 Instrument Size Introduction ……………………………………………………………………………………………………………..12

Chapter2

Instrument Introduction………………………………………………………………………………………………… 19

2.1 Unpacking and Transportation ……………………………………………………………………………………………………………19 2.2 Verifying the Shipment………………………………………………………………………………………………………………………20 2.3 Front Panel ………………………………………………………………………………………………………………………………………21 2.4 Keyboard …………………………………………………………………………………………………………………………………………21 2.5 Push-on Knob …………………………………………………………………………………………………………………………………..23 2.6 Rear Panel ……………………………………………………………………………………………………………………………………….23

Chapter3

Installation ………………………………………………………………………………………………………………….. 26

3.1 Connecting the Power Cord ……………………………………………………………………………………………………………….26 3.2 Connecting Test Lines ( Optional)………………………………………………………………………………………………………..29 3.3 Installing Fiber Cables (Only for IT7930P-350-180) ………………………………………………………………………………..34

Chapter4

Getting Started …………………………………………………………………………………………………………….. 35

4.1 Power-on the Instrument…………………………………………………………………………………………………………………..35 4.2 Home-Screen Overview …………………………………………………………………………………………………………………….36 4.3 Touch Screen Introduction …………………………………………………………………………………………………………………39 4.4 Set output parameters ………………………………………………………………………………………………………………………40 4.5 Output On/Off Control ………………………………………………………………………………………………………………………40

Chapter5

Voltage Source Mode Operation……………………………………………………………………………………… 42

5.1 full 4-Quadrant output character ………………………………………………………………………………………………………..42

5.2 Select the Power Supply Mode …………………………………………………………………………………………………………..43

5.3 Select the Output Mode…………………………………………………………………………………………………………………….43

5.3.1 5.3.2 5.3.3 5.3.4

AADDCCCC++OODAuuCCttppMMuuttooMMddeeoo..dd….ee………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..

44 44 45 46

5.4 Current Limit Mode and Power Limit Mode …………………………………………………………………………………………46

5.5 Protection Function…………………………………………………………………………………………………………………………..46

5.5.1 5.5.2 5.5.3 5.5.4 5.5.5

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48 48 49 49 49

5.6 Professional Anti-islanding Test Mode …………………………………………………………………………………………………50

5.7 Waveform Selection ………………………………………………………………………………………………………………………….51

5.8 Full 4-Quadrant Power Amplifier ………………………………………………………………………………………………………..51

5.9 Auto-range Function …………………………………………………………………………………………………………………………52

5.10 Programmable Output Impedance ……………………………………………………………………………………………………52

5.11 Sweep Function………………………………………………………………………………………………………………………………52

Overview

5.12 List Function …………………………………………………………………………………………………………………………………..54

5.12.1 5.12.2 5.12.3

CSImerepleaoctrett//REaxunpneoLwrtisLLtiiFssttileffiill.ee…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………..

54 57 57

5.13 Setting of Surge/Sag Configuration ……………………………………………………………………………………………………58

5.14 Self-defined Waveform Function ………………………………………………………………………………………………………60

5.14.1 5.14.2

TSHelDfd.e..f.i.n..e..d……………………………………………………………………………………………………………………………………………………………………………………………………………………………………

60 63

5.15 Voltage Sampling…………………………………………………………………………………………………………………………….64

5.16 Voltage Signals Simulation ……………………………………………………………………………………………………………….66

5.17 Polyphase Function …………………………………………………………………………………………………………………………68

5.17.1 5.17.2 5.17.3

Connecting Connecting Connecting

ttDhhieegiDStayUlsITt/eO.m..M..B.e..ut.h.s.o..Md….e….t..h….o….d…………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….

68 68 70

5.18 Standard IEC Regulations …………………………………………………………………………………………………………………72

Chapter6

Current Source Mode Operation …………………………………………………………………………………….. 75

6.1 Select the Power Supply…………………………………………………………………………………………………………………….75

6.2 Select the Output Mode…………………………………………………………………………………………………………………….75

6.2.1 6.2.2

AACC+ODuCtpOutuMtpoudt eM.o..d..e…………………………………………………………………………………………………………………………………………………………………………………………………………..

75 76

Chapter7

Load mode Operation……………………………………………………………………………………………………. 77

7.1 Select Phase …………………………………………………………………………………………………………………………………….77

7.2 Select the Input Mode……………………………………………………………………………………………………………………….77

7.2.1 7.2.2

AC DC

Input Input

MMooddee…………………………………………………………………………………………………………………………………………………………………………………………………………………………..

78 78

7.3 AC Load Function ……………………………………………………………………………………………………………………………..78

7.3.1 7.3.2 7.3.3 7.3.4 7.3.5 7.3.6

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78 80 81 82 84 85

7.4 DC Load Function ……………………………………………………………………………………………………………………………..86

7.4.1 7.4.2 7.4.3 7.4.4 7.4.5

Constant Constant Constant Constant Complex

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87 87 87 87 88

7.5 Rectified Mode…………………………………………………………………………………………………………………………………90

7.6 Waveform Selection ………………………………………………………………………………………………………………………….93

7.7 Phase Loss ……………………………………………………………………………………………………………………………………….94

7.8 Three-phase unbalance simulation ……………………………………………………………………………………………………..94

7.9 Load angle and unload angle control …………………………………………………………………………………………………..95

7.10 Sweep Function………………………………………………………………………………………………………………………………96

7.11 Synchronization Function…………………………………………………………………………………………………………………97

7.12 List Function …………………………………………………………………………………………………………………………………..98

7.12.1 7.12.2 7.12.3

CISmerepleaoctrett//REaxunpneoLwrtisLLtiiFssttileffiill.ee………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………11. 900912

7.13 Setting of Surge/Sag Configuration ………………………………………………………………………………………………….102

7.14 Self-defined Waveform Function …………………………………………………………………………………………………….104

7.14.1 7.14.2

STHelDfd.e..f.i.n..e..d………………………………………………………………………………………………………………………………………………………………………………………………………………………………..

104 106

7.15 Protection Function……………………………………………………………………………………………………………………….107

7.15.1 7.15.2 7.15.3 7.15.4 7.15.5

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107 108 108 108 109

Overview

7.15.6 7.15.7 7.15.8

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109 110 110

Chapter8

System-Related Functions ……………………………………………………………………………………………. 111

8.1 System Menu Reference ………………………………………………………………………………………………………………….111

8.1.1 8.1.2 8.1.3

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117 119 119

8.2 Configuration Menu Reference …………………………………………………………………………………………………………119

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8.4 Switching Local/Remote Mode …………………………………………………………………………………………………………124

8.5 Save and Recall Operations ………………………………………………………………………………………………………………124

8.6 Screen Capture Function ………………………………………………………………………………………………………………….125

8.7 Trigger Function ……………………………………………………………………………………………………………………………..125

8.8 Query the System Log ……………………………………………………………………………………………………………………..126

8.9 Query the Energy ……………………………………………………………………………………………………………………………126

8.10 Set Parallel Operation Mode …………………………………………………………………………………………………………..126

8.11 Remote Measurement Function ……………………………………………………………………………………………………..131

8.12 Digital I/O Function ……………………………………………………………………………………………………………………….131

8.13 Analogue Function (Ext-Program) (Optional) …………………………………………………………………………………….135

Chapter9

Measurement Functions………………………………………………………………………………………………. 139

9.1 Meter Mode …………………………………………………………………………………………………………………………………..139

9.2 Oscilloscope Mode ………………………………………………………………………………………………………………………….140

9.3 Harmonic measurement ………………………………………………………………………………………………………………….142

9.3.1 9.3.2

Harmonic Harmonic

AMneaalsyusirse.m…e..n..t……………………………………………………………………………………………………………………………………………………………………………………………..

142 144

9.4 Recorder Function …………………………………………………………………………………………………………………………..146

Chapter10

Technical Specifications ……………………………………………………………………………………………. 148

10.1 Supplemental characteristics ………………………………………………………………………………………………………….148 10.2 Main technical parameters …………………………………………………………………………………………………………….148
IT7905P-350-30U ……………………………………………………………………………………………………………… 148

Chapter11

Remote Control ………………………………………………………………………………………………………. 153

11.1 USB Interface………………………………………………………………………………………………………………………………..153 11.2 LAN Interface………………………………………………………………………………………………………………………………..153 11.3 CAN Interface ……………………………………………………………………………………………………………………………….156 11.4 GPIB Interface (Optional) ……………………………………………………………………………………………………………….157 11.5 RS232 Interface (Optional) ……………………………………………………………………………………………………………158 11.6 Commonly Used Commands Overview…………………………………………………………………………………………….159 11.7 Demo Software Introduction ………………………………………………………………………………………………………….160

Appendix………………………………………………………………………………………………………………………………………… 161

Specifications of Red and Black Test Lines ……………………………………………………………………………………………….161

Overview
Chapter1 Overview
This chapter introduces the front panel, the rear panel, key functions and LCD display function of the IT7900P 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 IT7900P series represents a new generation of programmable, full power source and sink 4-Quadrant grid simulators and also can perform as a 4Quadrant power amplifier, providing the flexibility to test widest range of grid-tied devices, including PCS, energy storage systems, micro grids, BOBC (V2X) and power-related hardware in the loop emulation (PHiL).
The IT7900P series is equipped with a professional anti-islanding test mode, allowing the user to set R, L, C and active and reactive power parameters to simulate non-linear loads on the grid and achieve anti- islanding testing requirement. The IT7900P series supports energy recovery function that provides 100% current absorption and feeds back into local grid through the device, saving electricity bills and heat dissipation costs.
ITECH IT7900P Regenerative Grid Simulator adopts high power density design of 15kVA in 3U enclosure and provides wide voltage ranges up to 350V L-N. Easily expandable by Master-slave parallel configuration for higher power up to 960kVA. Comprehensive options of operating modes can meet users’ requirements for single-phase, three-phase, reversed-phase and multi-channel testing requirements. Extended AC voltage range to 700V L-N enabled by reversed mode. The powerful arbitrary waveform editing function can simulate a variety of grid disturbance waveforms, which is an ideal solution for testing and R&D laboratories.

Parameter Features
Adopt advanced SiC technology High power density, up to 6 kVA for 2U and 15 kVA for 3U Voltage can reach 350V L-N Master and slave equal flow, parallel machines up to 960kVA Highly efficient power regeneration

Overview
Comprehensive working modes selectable: single-phase, three-phase, reversed phase and multi-channel, Voltage extension to 200% of rated voltage in inverted mode
Support LIST/SWEEP/Surge&Sag three waveform modes Built-in rich waveform database Harmonic simulation and analysis function up to 50 times,built-in IEC61000-
3-2/3-12 *1
Can simulate arbitrary waveform output, support CSV file import waveform
Phase angle 0-360° settable
Touch screen design, simple UI interface Built-in USB/CAN/LAN /Digital IO interface,optional GPIB/analog & RS232
interface
Full protection functions including automatic clearing,POVP ,watchdog, etc.
Current source mode

Source mode:

Regenerative grid simulator & full 4-Quadrant AC&DC power sources
Frequency: 16-2400Hz
Power Amplifier function for PHiL applications
Professional islanding test mode, support R, L, C and active, reactive power settings
Four output modes of AC/DC/AC+DC/DC+AC can be realized
Multi-channel function, single unit can test 1-3 DUTs at the same time
Programmable output impedance, simulation of real-world impedance Harmonic/inter harmonic synthesis
Frequency lock and phase lock function to achieve 6 phase& 12 phase power output
Compliance tests incl. LVRT /Phase Jump/Frequency variation/harmonic injection
Supported regulatory testing include IEC61000-4-11/4-13/4-14/4-28
Provide rich trigger configuration, synchronous capture of the voltage waveform of the object to be measured, to achieve data acquisition and simulation functions
Optional software can help complete the pre-compliance standards test of civil avionics/electrical ships interms of the multi-national safety regulations.

Load mode:

Regenerative full 4-Quadrant AC&DC load

Frequency: 16-500Hz

AC mode supports CC/CP/CR/CS/CC+CR/CE multiple operating modes, and CE mode can simulate a variety of circuit topologies such as singlephase rectifier RLC and shunt RLC.

DC mode supports 9 working modes such as CC/CR/CP/CV

AC mode supports both rectified and non-rectified modes

Adjustable crest factor: 1.414 ~ 5.0

Support phase shift function in the range of -180º~180º *2

The unit power factor1 function allows the current waveform to vary with the

Overview
voltage waveform and the power factor is as close to 1 as possible Supporting unloading angle control, 0-359° adjustable
1 Voltage/current harmonic analysis, voltage harmonic simulation in source mode, current harmonic simulation in load mode, fundamental wave60Hz
2 After the rectification function is turned on, the setting range of the phase shift is restricted by the crest factor

1.2 Models and Options

Model

Power Voltage

IT7902P-350-10U

2kVA 350V

IT7902P-350-10U-ATE 2kVA 350V

IT7904P-350-20U

4kVA 350V

IT7904P-350-20U-ATE 4kVA 350V

IT7905P-350-30U

5kVA 350V

IT7906P-350-30

6kVA 350V

IT7906P-350-30-ATE 6kVA 350V

IT7906P-350-90

6kVA 350V

IT7909P-350-90

9kVA 350V

IT7912P-350-90

12kVA 350V

IT7915P-350-90

15kVA 350V

IT7930P-350-180

30kVA 350V

IT7945P-350-270

45kVA 350V

IT7960P-350-360

60kVA 350V

IT7975P-350-450

75kVA 350V

IT7990P-350-540

90kVA 350V

IT79105P-350-630

105kVA 350V

IT79120P-350-720

120kVA 350V

IT79135P-350-810

135kVA 350V

IT79150P-350-900

150kVA 350V

IT79165P-350-990

165kVA 350V

Current Phase

10A

20A

30A

1 or 3

30A

1 or 3

90A

1 or 3

90A

1 or 3

90A

1 or 3

90A

1 or 3

180A

1 or 3

270A

1 or 3

360A

1 or 3

450A

1 or 3

540A

1 or 3

630A

1 or 3

720A

1 or 3

810A

1 or 3

900A

1 or 3

990A

1 or 3

Height
2U 1U 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: IT79XXX-YYY-ZZZ, wherein, XXX means rated power, YYY means rated voltage, and ZZZ means rated current. Take IT7915P-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.

1.3 Optional accessories

The IT7900P series supports the following optional accessories (sold

separately), the details are as below:

Overview

The interface expansion slot provided on the rear panel of the IT7900P 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

Fiber modules cables

optic IT-E168 and

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.
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.

Fiber modules cables

optic IT-E169 and

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.

1.4 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.
IT7902-350-10U-ATE/IT7904-350-20U-ATE/IT7906-350-30-ATE Model

Overview

IT7902-350-10U/IT7904-350-20U/IT7906-350-30

Overview
IT7905P-350-30U/IT7906P-350-90/IT7909P-350-90/IT7912P-350-90/IT7915P-350-90 Model

IT7930P-350-180 Model

Overview

IT7945P-350-270 Model

Overview

Overview
IT7960P-350-360/IT7975P-350-450/IT7990P-350-540/IT79105P-350-630 Model

Overview
IT79120P-350-720/IT79135P-350-810/IT79150P-350-900/IT79165P-350-990 Model

Instrument Introduction
Chapter2 Instrument Introduction

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

Instrument Introduction
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

Quantity Model

IT7900P series

Power Cord

–

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 2.3 Connectiong the Power Cord for power cord connection.

USB cable

–

Factory

alignment

–

report

Instrument Introduction
–
Test report before delivery

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 IT7930P-350-180 model comes with a yellow optical fiber cable. The fiber cable need to install by yourself. For details, see 3.3 chapter.

2.3 Front Panel

The front panel of IT7900P is as shown below.

1 2

6 7

8
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

2.4 Keyboard
The keyboard introduction of IT7900P series Power Supply is shown as follows.

Keys

Description

Print Trig Power Menu

Used for saving screen images Used for manual trigger Power Switch Used for going back to menu page

Keys [Set] [F-set] Config

Description Set the output voltage value
· AC mode: set the output frequency · DC mode: [F-set] is invalid Enter to Configuration menu

Instrument Introduction

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

Basic metering 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. 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]+Set

Description Enter the List function menu.

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

Enter the Sweep function menu.

[Shift]+Config [Shift]+

(System)

Enter the protection setting menu.
Enter the System setting menu. Used to set the system parameters.

[Shift]+

(Surge&Sag)

[Shift]+

(Standard)

[Shift]+1 [Shift]+ [2] (Lock)

Enter the Surge and Sag menu, used to Set the Surge/trapped Configuration. Enter the standard wave selection interface. Enter the data logging function menu.
Turn the keyboard lock on or off.

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

Instrument Introduction
Description 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.

2.5 Push-on Knob
The IT7900P 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.
2.6 Rear Panel
The rear panel of the IT7900P series 3U model is shown below.

Instrument Introduction

No. Name

Description

ground terminal Ground screw for making chassis ground

connections.

Output terminals AC or DC output terminals and chassis ground

terminals, used to connect DUT.

Remote sense

SL+ and SN- are remote sense terminals, used

Terminals

for maximizing measurement accuracy.

Output

lock terminals

and

Optional

Optional interfaces: (Plastic plugs are inserted

expansion slot by default when the user does not purchase the

interface.)

The optional interface as follows: GPIB RS-232/ Analog interface

I/O

Digital Port

terminals/CAN interface

CAN communication interface CAN-H and CANL

LAN interface

LAN communication interface

External control This interface is used for the parallel connection

interface CTRL 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 interface

USB communication interface.

system bus

Used for communication between instruments in

parallel operation feature.

10 AC power input Used to connect AC power to start instrument.

socket

Instrument Introduction
The rear panel of IT7900P series 15U and above series cabinets are the same. Take IT7945P-350-270 as an example, the rear panel is introduced as shown below.
4

1 2

1: Output socket, which can be used when users need single-phase lower than 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.

Installation
Chapter3 Installation
3.1 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.
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 of 3U instruments are divided into the following types according to different regions:

Installation
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 of the instrument.
NOTE
IT7930P-350-180 is standard equipped with two power cords.
AC Power Input Level
The AC input of this series is a three-phase AC power (three-phase four-wire) by default, and the model of 3kVA and 5kVA power supply can support single phase AC power input. The detailed specifications refer to Technical Specifications. Please pay attention to the AC input voltage level:
NOTE
When the AC input voltage of 5kVA and 12kVA or above are in the range of 190V- 240V, the power setting value is derated to 60%, and when the output exceeds the present rating, the instrument enters AC Input Overcurrent protection and the output is turned off. If a full power output is required, the AC input level Voltage must be greater than 240V.
Connecting the Power Cord
When connecting the instrument which rated power is 5kVA 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 (the rated AC current on L3 is 0, so, it can be connected or not). 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:

Multiple power supplies connect to three phase input:

Installation

When connecting the instrument which rated power is 6kVA or above. 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 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).

Installation

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 IT7930P-350-180 to the power distribution box.
3.2 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.

Installation
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 T7930P-350-180 consists of two 15kVA in parallel mode. The output terminals and Remote sense terminals use the master interface. The wiring method is the same as other models.
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.
When used as a three-phase power output, the Y connection mode is used as an example, The connection diagram is shown as follow: When Delta connection mode is selected in the system menu, the N wire does not need to be connected.

Installation
The connection diagram of reverse 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 multi-channel is shown as follow: Multi-channel mode is only available for Voltage Source mode.

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.

Installation
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 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 T7930P-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:

Installation

The above diagram shows Y-type wiring as an example. If the user needs type wiring, the N terminal of the IT7900P does not need to be connected to the object, but the N line of the Sense terminal needs to be connected to the N terminal of the output terminal.
The connection diagram of reverse 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

Installation
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 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.
3.3 Installing Fiber Cables (Only for IT7930P-350-180)
IT7930P-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.

Getting Started

Chapter4 Getting Started

4.1 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.

Power Switch Introduction

Getting Started

User can adjust the power switch directly to turn on or turn off the instrument. The status of Power switch is as follows.

The switching knob of the IT7900P series power supply allows the user to turn the power on by 90° clockwise or to turn the power off by 90° counterclockwise.

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 group 1 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.
4.2 Home-Screen Overview
IT7900P series power supply adopts touch screen design, the users can easily operation by touch 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.

Getting Started
Single Phase Mode
The meter interface of IT7900P 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 IT7900P three phase mode is shown as follow. The parameters are the same as the single phase.

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.

Getting Started
The meter interface of phase A is shown as follow, the display parameters are the same as single mode. You can click the A, B or C to switch the phase interface.

Introduction to Interface Symbols

The interface of IT7900P 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

Key operation is locked

Single phase AC mode

Three phase AC mode

Single phase DC mode

Three phase AC+DC mode

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 External Simulation Test Function

Split phase DC+AC mode

Single phase AC+DC mode

Multi-channel AC+DC mode

Multi-channel DC+AC mode

Surge&Sag indicator

function

Record log

LIST is running

LIST is finished

Char

Function description
LIST function is waiting for trigger

Char

Sweep running indicator

Getting Started
Function description Sweep function is waiting for trigger
Found USB disk

Sense indicator
Over voltage protection AC/AC+DC mode Peak OCP Over power protection

Sense Error
Over temperature protection AC/AC+DC mode RMS OCP
Fiber is error

SYNC unlock

SYNC lock

Current Negative

Voltage sample mode

Menu Introduction
Press the [Menu] key on the front panel and enter to the menu interface. Menu interface will display all of function icon, user can rotate the knob or direction key to select, or click the screen to enter the function interface.

4.3 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.

Getting Started

4.4 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.
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.
4.5 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.
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.

Getting Started

Voltage Source Mode Operation
Chapter5 Voltage Source Mode Operation
When the user sets the operation mode to Voltage Source mode in the system menu, the instrument is a four-quadrant grid simulator. This chapter describes the functions and features of the instrument in Source mode.
5.1 full 4-Quadrant output character
The IT7900P series represent the newest generation of programmable, full fourquadrant grid simulators with full 100% of current rating in both source and sink mode, and provides energy recovery capability. The power generated by the DUT during the test can be easily retuned to the AC grid, rather than being dissipated as heat. which protects the environment and lowers the cost of operation. It can be applied to the applications in testing grid-tied products that inject energy into the grid, such as the frequency changes, voltage transients and DC injection of grid-tied/off-grid inverters testing.
The relationship between output voltage, current, power and frequency is shown in the figure below.

Voltage and frequency will affect each other, as shown above, different line colors represent different frequency bands, different frequencies will affect the maximum output voltage, for example: at 2kHz maximum voltage is 250.76Vrms

Voltage Source Mode Operation
and at 2.4kHz is 208.97Vrms. voltage and current will be limited by the total power between them.
5.2 Select the Power Supply Mode
The IT7900P 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 (Available for Volt Source Mode)
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 IT7900 series allows users to test 3 independent DUTs at the same time without adding additional hardware configuration. In the traditional solution, the user needs to configure 3 AC power supplies; and one IT7900 device can meet multi-channel testing requirements. Under multi-channel mode,The output parameters and waveform of each channel can be set independently. The output mode can be set to AC/DC/ACDC/DCAC. Advanced functions are not available in multi-channel mode.

5.3 Select the Output Mode
The IT7900P 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.

Voltage Source Mode Operation

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.

5.3.1 AC Output Mode
If the output mode select to AC Mode, the instrument will simulate AC power supply. The default set of IT7900P 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.

5.3.2 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.

Voltage Source Mode Operation

5.3.3 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. The setting range is 10% of rated voltage.
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.

Voltage Source Mode Operation
5.3.4 DC+AC Mode
If the output mode select to DC+AC Mode, the instrument will simulate DC and AC power supply, which can add AC component to DC voltage. Set the output voltage in the main 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 wave,Vac component and frequency under the config interface. The Vac setting range is 10% of rated voltage.

5.4 Current Limit Mode and Power Limit Mode
The IT7900P 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 5.5 Protection Function for detailed setting methods.

5.5 Protection Function
IT7900P 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.

Voltage Source:

Current RMS protection RMS current for OCP protection

Current peak protection Voltage max protection Voltage peak range Power limit range

Voltage Source Mode Operation

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

Maximum voltage point

Max

Maximum voltage value

Time

Delay time

Voltage peak range setting

V limit

Maximum voltage setting

Power limit setting

P limit

Power limit point

Time

delay time of protection

Type

Protection type.

Limit

Output Disable

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

Current limit

Mode

Can not edit

Time

Delay time, range from 0s-10s.

I-High

Maximum current

I-Low

Minimum current

Voltage limit

Mode

Can not edit

Time

Delay time, range from 0s-10s.

V-High

Maximum voltage

V-Low

Minimum voltage

Power limit

Mode

Can not edit

Time

Delay time, range from 0s-10s.

P-High

Maximum power

P-Low

Minimum power

DC/DCAC Mode

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

Current limit range Voltage limit range

Current limit setting I+ limit
I- limit
Voltage limit setting V+ limit

Maximum current setting, the current setting will be limited to this range. Minimum current setting, the current setting will be limited to this range.
Maximum voltage setting, the voltage setting will be limited to

Power limit range

V- limit
Power limit setting P+ limit
P- limit

Voltage Source Mode Operation
this range.
Minimum voltage setting, the voltage setting will be limited to this range.
Maximum power setting, the power setting will be limited to this range. Minimum power setting, the power setting will be limited to this range.

5.5.1 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 sequence, and press [Enter] to confirm.

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 PROTection:CLEar) to clear the protection status. The message displayed in front panel is cleared and the instrument exits protection status.
5.5.2 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.

Voltage Source Mode Operation
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 PROTection:CLEar) to clear the protection status. The message displayed in front panel is cleared and the instrument exits protection status.

5.5.3 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.

5.5.4 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

“PROTection:CLEar”). Then

on the power supply screen will disappear,

and the power supply will exit the OTP status.

5.5.5 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 “PROTection:CLEar”) to

clear

Voltage Source Mode Operation
on the front panel and exit the OPP mode.

5.6 Professional Anti-islanding Test Mode
The IT7900P series provide a professional anit-islanding test mode. Users can adjust RLC parameters or configure the parameters of active power and reactive power to simulate islanding status between inverter and load when the main network is off, and verify the anti-islanding protection response time of grid-tied DUTs under different equivalent impedances, three-phase load balancing and non-balancing conditions.
The solution helps engineers to simplify the test circuit and cost savings of additional equipment such as oscilloscopes and power meters.
1. Click the RLC function in Menu interface and enter to islanding simulator function.

2. Select the mode.

PQ mode: configure the parameters of active power(P), reactive power

Voltage Source Mode Operation
QL and QC. RLC mode: configure the parameters of R, L, C.
3. Set the Phase, it means the output stop phase angle when close the K1 switch.
4. Close the K2 switch, connecting the load and UUT, and then close the K1 switch, power on the UUT.
5. Open the K1 switch, enable the islanding status. Test the anti-islanding protection response time, The interface will display the running time value in the island state.
5.7 Waveform Selection
The user can set the output waveform in the config menu of IT7900 series power supply. Eight output waveforms below are available, user can select the waveform in Config->Waveform menu.

Sine Square Sawtooth Triangle Trapezoid Clipped-sine Rectifier THD wave User- defined
When Trapezoid, Clipped-sine, THD Wave and User-define are selected, the user should configure the parameter of waveform.

5.8 Full 4-Quadrant Power Amplifier
The IT7900P series regenerative grid simulator can be used as a power amplifier to complete power hardware in the loop (PHIL) applications for microgrids,

Voltage Source Mode Operation
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 amplification function can only be realized by selecting external analog interface. Please refer to the Analogue function in 7.13 for the specific use method.
5.9 Auto-range Function
IT7900P 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.

5.10 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.
5.11 Sweep Function
The Sweep function is used to test efficiency of switching 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. As the test closes, voltage and frequency at the maximum power point may be displayed. Sweep function is not applicable under DC mode and DCAC mode.
The Sweep function is not supported in multi-channel mode.
Operating steps
1. Press [Shift] + F-seton the front panel to enter the sweep interface, as shown in the figure below.

Voltage Source Mode Operation

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
Priority
Waveform

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. Priority setup Volt-Priority Freq-priority Volt&Freq Select sweep waveform Sine
Square

Sawtooth

Triangle

Trapezoid

Parameter Finish
Trig source

Voltage Source Mode Operation
Explain 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.

5.12 List Function
At maximum of 200 steps can be edited for each List file. The user can choose any waveform from existing 11 waveforms. Or, the user can choose a waveform file stored in the device through self-define function (see 8.3 “Self-defined Waveform Function” for details) and combine the waveform files into a List file based on required order. Meanwhile, the user can set the starting steps of the List file, run count and end state of the waveform, and edit parameters such as frequency, amplitude, running time and rising slope of each waveform.
5.12.1 Create a new List file
Create a new single-phase List file
Under single-phase mode, the user can output AC waveform sequences with different amplitudes by creating a new List file. Detailed operation steps are as below:
1. Press [Shift]+V-set on the front panel to enter the List function configuration interface, as shown in the figure below.

Voltage Source Mode Operation
888.csv: the list file name to execute. Trig source: select the trigger source Run/Stop: Run/stop the list function. Open: Select the List file to execute. New: Create a new List file. Edit: Edit present list file Delete: delete the present List file. 2. Press [New] and enter to the List file edit interface.

List edit description:

Description: Description of List, display list file name.

Repeat: Edit the cycles of the List file.

End: Set the final waveform, with the following options available:

Off: directly off the output after operation.

Voltage Source Mode Operation

Normal: return to normal after operation.

Last: keep the last waveform output unchanged after operation.

No.: step number of list. Click the numer, you can operate such as copy/paste/cut/insert/delete.

ACrms V: Voltage RMS value

Freq Hz: Frequency

Time S: width time

More: other settings, click … and setup the slew rate, waveform,phase and so on

Export: Export the internal List file of the instrument to an external USB flash drive.

Save: Save the list file.

Config: configure the list file to make it effective.

Clear all: delete all of step information

Trig source: select trigger source

3. Click (More)… enter to advanced menu of list file.

List parameters description

Parameter Voltage AC Start Phase
Phase Difference Frequency

Description Voltage value and slope.
Start phase setting, displayed in AC mode. By default, the program automatically calculates this value (which is guaranteed to be continuous with the previous step). If the user modifies this parameter, the user set value is used without guarantee of continuity.
Phase difference between ABC, only displays in AC 3-phase mode.
Frequency and slope, displayed in AC mode.

Waveform Step jump
Trig out

Voltage Source Mode Operation
Waveform type, every basic waveform can be selected, displayed in AC mode. Method of step jumps to next step. Time: when the time is out, jumps to next step Trig: receive a trigger signal, jumps to next step. Phase: jumps to next step at this phase. Whether outputs a signal when this step is ending.

4. Press [Esc] to return Edit interface, Press [Save]. At list Edit interface, click the step number, the [Insert]/[Paste]/[Cut]/[Copy] /[Delete] will display, click the key to edit.
5. Press [Esc] to return.
5.12.2 Select/Run List File
If several List files are edited, press Recall to recall the List file to be tested. Detailed operation steps are as below: 1. Press [Shift]+V-set on the front panel to enter the List function
configuration interface. 2. Press [Open], select the saved List01 csv file, and press [Enter] to enter
the file. 3. Press [On/Off] on the front panel, turn on the output. 4. Press [Run] in the list function interface. 5. Running indicator will appear in interface.
Press [Scope] key to view the output waveform.
5.12.3 Import/Export List file

Import List file

IT7900P series support import list file function, The user can finish the editing of List file in Excel and import it into the software. This function simplifies the List file edit and facilitates user operation.
To help user define an Excel file format, please export a CSV template from the List interface.
Detailed operation steps are as below:
1. Create a new Excel document on local PC and name it List02.
2. Open the Excel document and save it as in “other formats” i.e. “(*.csv)”.
3. Open the List02.csv document and edit the List. Set every step of the List and corresponding parameters and save the document in the USB disk.
List import file formats under single-phase mode:

Voltage Source Mode Operation

4. Insert the USB disk into the USB interface of the front panel. Press [Shift]+V-set on the front panel to enter the List function configuration interface.
5. Press [Open]. Select the List02.csv file and open it. The List file will be imported.
Export List file
After editing the List file, the user can directly save it into the device or export and save it into the peripheral memory disc. The exported List is saved in the format of. (*.csv). Detailed operation steps are as below:
1. Insert the U disk into the USB interface of the front panel.
2. Press [Shift]+V-set on the front panel to enter the List function configuration interface.
3. Select [Edit], enter to list file edit interface.
4. Press [Export]. This file will be exported into the USB disk.

5.13 Setting of Surge/Sag Configuration
IT7900P provides surge/sag simulation. The user can add surge/sag to simulate abnormal voltage fluctuation on the basis of outputting wave, and test usage of the DUT under this circumstance.
Surge/sag can be added to any waveform, the basic waveform is selected from the Config menu.
The Surge/Sag function is not supported in multi-channel mode.
NOTE
When using the dimming function, this function will automatically turn off, and when using this function, dimming function is turned off.
Operating steps

1. Press [Shift]+

(Surge&Sag) on the front panel to enter the List

function configuration interface.

Voltage Source Mode Operation

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

Parameters in the sweep interface are described as follows:

Parameter

Description

Mode

surge/sag executing mode.

Trig: Trigger mode. Executing the surge/sag after receiving the trigger signal.

Period: Period mode. Execute the surge/sag based on the period.

Action

This setting is valid when the mode select to Trigger.

Imme: Executing the surge/sag immediately.

Angle: Executing the surge/sag at specific angle.

Trig source

Select the trigger source when the mode select to Trigger.

Start angle

Set the start phase angle of the surge/trap when the mode select to trigger.

Angle width

Set the period of the surge/trap. For example, start angle=30 degree, Angle width=30 degree, then, the waveform will execute surge/sag at 30 to 60 degree.

Symmetry

Whether to produce symmetrical surge/sag waves.

If Start angle + Angle width >180°,this setting is Off state.

Repeat count repeat count of surge/sag waves.

Period count

Number of cycles to generate surge/sag waves. This parameter is meaningful only in Peroid mode.

This setting is used in combination with Repeat count, for
example, if Repeat count is set to 5 and Period count is set to 10, five surge/sag waves occur in every 10 cycles.

Parameter Enable Enable
Value select

Description

Voltage Source Mode Operation

Phase A/Phase B/Phase A&B/Phase B&C/Phase A&C/PhaseA&B&C:

Select the phase information where the surge/notch occurs.(displays under 3-phase mode)

Synchronize: Each of the three phases executes surge/trap at the same time.

Specify Phase: Each of the three phases executes surge/trap at the specified phase.

(displays under 3-phase mode)

Value select:

Percent: Set the percentage of the surge/trap amplitude to AC signal amplitude (RMS).

Setting: Set the value of the surge/trap amplitude.

1. Press [On/Off] on the front panel and enable the output.
2. Press [Run] on the interface, Then the running status will be displayed on LCD. Output parameters and measurement parameters are displayed on the left side of the interface. You can also press the Meter to observe the output parameters in the main interface.
3. After execute, [On/Off] on the front panel will be off, and running status will be displayed on LCD. You can press [Stop] on the interface to stop the surge/sag function.
5.14 Self-defined Waveform Function
In AC mode or AC+DC mode, you can customize waveform curves and save them locally as output waveform options. This self-defined waveform can be used as a normal output waveform or as a wave option for scanning waveform, Surge/Sag waveform, and LIST waveform.
5.14.1 THD
The distorted waveform can simulate voltage harmonic wave in the circuit. The user can set the extent to which the output voltage waveform deviates from the Sin wave voltage and test the usage of the DUT under this circumstance.
THD includes built-in 30 waveforms and user – defined waveforms.The interface is shown below.

Voltage Source Mode Operation
DST wave: Select waveforms which built into the instrument by default. When the waveform name is selected, the parameters and waveform diagram are displayed on the right side of the interface. User THD wave: THD wave of user defined. “+” Create a new THD wave. “-” Delete the seleted THD wave. ” ” Edit the THD wave. Press the “+” or ” ” enter to the edit interface.

Thd profile: THD file name

Thd formula: Distortion factor calculation formula.

%r: displaying harmonics in the form of percentage to the overall voltage amplitude of all harmonics.

%f: displaying harmonics in the form of percentage to the fundamental voltage.

Delete: select a row and click Delete.

Voltage Source Mode Operation

Open: import Thd wave data.

Save: Save the THD wave.

Back: return back upper menu.

THD=: Total distortion rate calculated based on the user Thd configuration.

Edit method of Thd:

New a THD point: Click on the last empty row, edit to complete the relevant settings, and the program will automatically sort into the table, while the waveform display is synchronized and updated.

Focus shift and modification: For the already existing Thd records, only the Thd %f and Phase columns are moved, and the focus automatically switches to the next one after the modification is completed. If the next focus Order N is empty, it stays at that focus, otherwise it stays at the next focus control, and the waveform display is updated simultaneously.

Import THD file

Users can edit a custom harmonic waveform file in .csv format and import it into the instrument. User defined harmonic waveform template files can be obtained by contacting ITECH, or an empty file can be exported directly from the instrument.

The harmonic waveform template description as follows:

Model: instrument model, Keep default.

Device_operation: operation mode of instrument, 0: voltage source, 1: load, 2: current source, Users are cautious to modify, the waveform files are not common in different modes.

Usage: Usage, keep default

Name: keep default

Type: Waveform type, harmonic custom waveform is 8, which must be 8 in this file.

Editable: keep default

Formula: Harmonic calculation formula, 0 represents f%, 1 represents r%

Unit_number: The number of data points edited needs to be consistent with the

number of data rows.

Voltage Source Mode Operation

Fund_phase: phase of fundamental waves, range from 0-360°

Order: harmonic order, range from 2-50

Thd: Thd value

Phase: phase of harmonic

5.14.2 Selfdefined
“+” create a new wave. “-” delete the wave file. ” ” edit the wave file.

Edit interface:

Profile: user-defined file name
Origin Symmetry: To select the waveform data type, you can select 512 origin symm/512 origin asymm /1024 points

Open: import waveform data. Save: Save the user-define wave. Delete: select a row and click Delete. Clean: delete all of data Back: return back upper menu.
Import user-define waveform file

Voltage Source Mode Operation

Users can edit a user-defined waveform file in .csv format and import it into the instrument. User defined harmonic waveform template files can be obtained by contacting ITECH, or an empty file can be exported directly from the instrument.
The user-defined waveform template description as follows:
Model: keep default
operation mode of instrument, 0: voltage source, 1: load, 2: current source, Users are cautious to modify, the waveform files are not common in different modes.
Usage: Usage, keep default
Name: keep default
Type: Waveform type, user-defined waveform is 9, which must be 9 in this file.
Editable: keep default
Point_number: The number of data points to be edited, which needs to be consistent with the data row in the table. Associated with the Origin_symm parameter.
Origin_symm: symmetry option, 0 represents 512 non-origin symmetry, 1 represents 512 origin symmetry, 2 represents 1024 points.
Index/fval: Data points and detailed parameter values.

5.15 Voltage Sampling
The IT7900P series instruments can be used as data sampling devices to collect voltage variation signals from other instrument. With this function, users can realize the acquisition of the actual grid voltage change state of the DUT, and then use the import function to reproduce the grid state.

Voltage Source Mode Operation
Connecting method
When the voltage signal is sampling, the wiring method is the same as the test line connection method when outputting. For single-phase, connect the two terminals A and N, and for three-phase, connect the four terminals ABCN. For details, refer to section 2.5 Connecting the Test Lines, and take the sampling DUT supply voltage signal as an example, the wiring diagram is shown below.
Operation method
Click Menu > Volt sample and enter to Voltage signals sampling interface, the display is shown below.

File: Input the name of the sampling file, the default display is null, you need to input the file name before sampling.
4: Represents the number of sampling. If you click Run once, the number of sampling will be increased once and a test-1 file will be formed.
Export: export the sampling file.
Run: start to sampling

Setting the configuration
Click Configure in the voltage sampling interface to enter the parameter setting

interface.

Voltage Source Mode Operation

Sampling rate: Sampling rate, indicating the sampling interval of data points. Setting range 1-50, unit kHz
Start Condition: setting the condition of sampling
Imme: Sampling is executed immediately after clicking Run.
Trigger1: After clicking Run, wait for the Trigger1 signal to be received to start executing sampling.
Trigger2: After clicking Run, wait for the Trigger2 signal to be received to start executing sampling.
Capture-Vac: The voltage signal sampling after compared. When this mode is selected, additional parameters need to be set. Trigger delay: Set the sample data delay time. Set a positive value to record data after the capture event occurs. A negative value means that data before the capture event occurs is recorded. Compare: Select the object of comparison, either Vac/Rms or Vac/Peak Up Limit: AC voltage upper limit value, grid voltage greater than the upper limit value will start sampling. Down Limit: AC voltage lower limit value, grid voltage less than the lower limit value will start sampling. Display mode: Auto/Normal
5.16 Voltage Signals Simulation
In AC mode or AC+DC mode, users can import TDMS waveform curve files for simulation, and set parameters such as repetition times and waveform offset for imported waveform.
By default, the open waveform is only for real-time simulation. If you remove the USB disk, the waveform disappears. Users can also permanently save the open waveform to the power supply memory.
Directly click Simulation in the Menu to enter the voltage signal Simulation interface, as shown below:

Voltage Source Mode Operation
Start mode: can be selected as immediate execution or trigger execution. Interval time: The interval between waveform repeats.This parameter is displayed only when start mode is selected for Imme. Repeat: Number of repeated execution of waveform Coefficient: Waveform amplification Coefficient DC: DC offset Open: Open the waveform file. Delete: Delete the waveform file. Import: Import and save the waveform file to the power supply memory. Export: Export the waveform file to the U disk. Run: Start running waveform. Power output should be turned on before operation.

Voltage Source Mode Operation
5.17 Polyphase Function
The IT7900P 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.
5.17.1 Connecting the DUT
When two IT7900P power supplies are combined in multiple phases, the outputs ABC are connected separately and the N wires of the two IT7900P power supplies need to be connected together as six-phase N wire terminals. The wiring schematic is shown below.

5.17.2 Connecting the System Bus Method
The two IT7900P 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.

Voltage Source Mode Operation
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.

Freq limitException Sync select

Voltage Source Mode Operation
Set the frequency difference upper 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.

5.17.3 Connecting Digital I/O Method
Connect the IO-4 pins of two IT7900P power supplies. One IT7900P outputs synchronization signals to the other IT7900P. 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 IT7900P power supply as a synchronization signal output to Syncout, and the others set to Sync-out.

Voltage Source Mode Operation
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

Sync select

(settable only in fiber slave mode). 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.

Voltage Source Mode Operation
5.18 Standard IEC Regulations
IT7900P series AC/DC power supplies provide standard test curves in accordance with IEC 61000-4-11/4-13/4-14/4-28 regulations. It can be invoked directly by the user when testing IEC compliance tests.
This function provides both the test curve that meets the standard requirements of regulations and the curve customization function. Users can customize the curve according to the project requirements of regulations and perform the extended test of the test object.

Click Standard on the Menu screen directly press Shift+ to enter the regulation test screen.

(Standard)

NOTE
For parameters of corresponding curves and related regulations, refer to IEC standards.

Voltage Source Mode Operation
Interface Instruction
Take IEC 61000-4-11 as an example to introduce the interface display and how to use the regulation test.The usage method of other regulatory interfaces is the same, but the displayed parameters are different.
Standards Selection Area

Standards Edit Area

Standards Selection Area

In the Standards selection area, users can select the regulation to be tested.

Each option is described as follows:

Standards

Select the regulations to be tested.

the following regulations are supported: IEC 61000-4-11 IEC 61000-4-13 IEC 61000-4-14 IEC 61000-4-28

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IT7900P Programmable AC Power Supply

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