Mikro RX380 Digital Power Meter User Manual

RX380 Digital Power Meter

v1.2
Digital Power Meter User Manual RX380
No.3, Jalan Anggerik Mokara 31/48, Seksyen 31, Kota Kemuning, 40460 Shah Alam, Selangor, Malaysia Website: www.itmikro.com.my
Tel: +(603)5525 3863 Fax: +(603)5525 3873

HAZARD CATAGORIES AND SPECIAL SYMBOL
Read all instruction carefully and check the device before installing or servicing it. The following safety alert symbol may appear throughout this manual or on the device to warn of any potential hazards or to call for attention.
PLEASE NOTE The power meter should be installed, operated, serviced and maintained only by qualified personnel. No responsibility is assumed by the manufacturer for any consequences arising out of the use of this material.
DISCLAIMER Mikro shall not be liable for errors contained herein including any incidental and/or consequential damages arising from the use of this material. Mikro also reserves the right to vary the product from that described in this material without prior notice.
COPYRIGHT The licensed software contained in the product is proprietary software owned by Mikro or its third party suppliers and shall be used solely in connection with the product.
BEFORE YOU BEGIN
· Apply appropriate personal protective equipment and follow safe electrical work practices. · NEVER work alone. · Turn off all power supplying the power meter and the equipment in which it is installed before working
on it. · Always use a properly rated voltage sensing device to confirm that all power is off. · Before closing all covers and doors, carefully inspect the work area for tools and objects that may have
been left inside the equipment. · NEVER bypass external fusing. · NEVER open circuit a CT; use the shorting block to short circuit the leads of the CT before removing
the connection from the power meter. · Before performing hi-pot testing on any equipment in which the power meter is installed, disconnect all
input and output wires to the power meter. High voltage testing may damage electronic components contained in the power meter. · The power meter should be installed in a suitable electrical enclosure.
Failure to follow this instruction may result in serious injury

CONTENTS

1. Introduction

1

1.1. Content of box

1

1.2. Part of power meter

2

2. Installation Guide

3

2.1. Precautions

3

2.2. Mounting

3

2.3. Wiring

4

3. Meter parameters

6

4. Display and Buttons

6

5. Function

7

6. Setting up

9

6.1. Access programming mode

9

6.2. Setup CT ratio

10

6.3. Setup PT ratio

10

6.4. Neutral current

11

6.5. Setup communication configuration

11

6.6. Demand setting

12

6.7. System setting

12

6.8. Reset all energy register

13

6.9. Reset demand register

13

6.10. Reset maximum & minimum value

14

6.11. Remote set

14

6.12. Scroll setting

15

6.13 Scroll delay setting

15

6.14 Reset Hour on register

16

6.15 Backlight setting

16

6.16 Software version

16

6.17 Exit from programming mode

17

6.18 Setup new password

17

7. Specifications

18

8. Modbus Data Register

20

9. Maintenance and Troubleshooting

29

10. Dimensions

29

11. Appendix

30

11.1. Demand Calculation

30

11.2. Data Read Format from Modbus

30

11.3. Neutral Current Calculation

31

FIGURES

1. Parts of power meter

2

2. Recommended cut-out

3

3. 3-phase 4-wire system with 4 CTs

4

4. 3-phase 4-wire system with 3 CTs

4

5. 3-phase 3-wire with 3CTs and 3VTs

5

6. 3-phase 3-wire with 2CTs and 3VTs

5

7. Menu map for the normal mode

7

8. Flow map for the programming mode

8

TABLE

1. Parts list

1

2. Location and part label

2

3. Model information

2

4. Specification

18

5. Data length nomenclature

20

6. Device and communication register

20

7. Operation data registers

21

8. Setting data registers

28

1. Introduction
Thank you for purchasing the RX380 Digital Power Meter. This multifunctional power meter measures the following parameters:
· True RMS phase voltage ( L – N ) · True RMS line voltage ( L – L ) · True RMS phase and neutral current · Positive and negative maximum and minimum active and reactive power · Maximum and minimum apparent power · Total active, reactive and apparent energy · Total and displacement power factor · Frequency · Voltage and current total harmonic distortion (THD) · Demand and maximum demand for total real, reactive and apparent power · Maximum and minimum phase and line voltage · Maximum and minimum phase and neutral current · Positive and negative maximum and minimum total active, reactive and apparent power
This power meter also comes with the Modbus-RTU connectivity.

1.1. CONTENT OF BOX Upon opening this box, you should find the following item shown in table 1:

Table 1: Parts list

No

Description

1

RX380 power meter

2

Retainer clip

3

Quick guide

Quantity 1 2 1

1.2. PARTS OF POWER METER
5 6
6 5

1 2

4

3

Figure 1: Parts of power meter

Table 2: Location and part label

No

Part

Description

1 Current inputs

Current metering connections

2 RS485 port

The RS485 port is used for communications with remote monitoring and control system

3 Power supply input Connection to power the meter

4 Voltage inputs

Voltage metering connections

5 Retainer clips

Used to hold power meter in place.

6 Retainer clips slot

To slot-in retainer clips in place

Table 3: Model information RX380

Model Information Auxiliary 90~415VAC or 100~300VDC; with Modbus

2

2. Installation Guide
2.1. PRECAUTIONS Before installing the power meter, please check that the environment meets the following condition:
· Operating temperature -10 Celcius to +55 Celcius. · Humidity 5% to 95%, non- condensing · Dust free environmental away from electrical noise and radiation

2.2. MOUNTING
91 ± 0.5mm
Figure 2: Recommended cut-out.

91 ± 0.5mm

a) Provide a cut out hole on the switchgear panel according to the
dimension below.
b) Insert the power meter through the hole and slide in the retainer clip along the slots on left and right sides or bottom and top sides of the power meter until the device is tightly secured on the switchgear panel. The orientation of the retainer clips is shown in Figure 1. The retainer clip can be removed by lifting the tab lightly at the handle end.
c) Connect the metering voltage input, current input, communication and auxiliary according to the wiring schemes shown in Section 2.3, Figure 3 to 6 on the next page.
d) The recommended wire size is as below:
· Voltage input and auxiliary – AWG16~22 · Current input – AWG12~18 · Modbus- RTU – AWG22 or thicker, shielded twisted pair

NOTE: Polarity marks must be followed as shown for CTs (S1 and S2). Please make sure the power to the current metering input is totally shunted. Under no circumstances can the CT connection be left in open circuit. Use a CT shorting block if necessary.

e) When connecting the power meter, please make sure the polarity to the terminal is correctly aligned. f) If the Modbus-RTU is used, it can be connected up to 32 devices in a daisy chain fashion and the cable total length should not be more than 1000m.
NOTE: For Modbus-RTU connection, avoid running the cable near sources of electrical noise. The network cable shield should be grounded at only one end.

3

2.3. WIRING

19
20 1 2 3 4 5 6 7 8

15

13

16 14

17

12

18

Figure 3: 3 Phase 4-Wire System with 4CTs connection, direct voltage input.

19

20 1 2 3 4

5 6 7 8

13

15

14

16

12

17 18

Figure 4: 3-Phase 4-Wire System with 3CTs connection, direct voltage input.
NOTE: Neutral current measurement is based on the vector sum of 3 CTs.

4

19
20 1 2 3 4 5 6

7

8

13

15

14

16

12

17 18

Figure 5 : 3-phase 3-wire with 3CTs and 3VTs connection.

19
20 1 2 3 4 5 6

7

8

13

15 14

16

12

17 18

Figure 6: 3-phase 3-wire with 2CTs and 3VTs connection.

NOTE: I2 current measurement is based on the vector sum of 2 CTs.

5

3. Meter parameters
Before commencing operation, the meter has to be set up. To do this, the meter must be powered up by the meter control power supply.
Under Section 6, the following parameters should be reviewed against the default value if necessary:
· CT Ratio · PT Ratio · Neutral current input · Modbus-RTU setting · Demand setting · System setting · Remote Set · Scroll mode setting and delay time · Backlight setting
The flow maps for the meter is under Section 5. It is guideline for the user to flip to the desire window whether in normal mode or programming mode.

4. Display and Buttons n m

l

k

RX 380 DIGITAL POWER METER

j

i

a. Setting Indicator

b. Total Indicator

a

c. Alarm Indicator

b

d. Percentage Indicator

c

e. Phase Sequence Error Indicator

d

f. Unit Indicator

e

g. Capacitive/Inductive Indicator

f

h. Digit Display

g

i. `PROG’ button

h

j. `NEXT’ button

k. `DOWN’ button

l. `UP’ button

m. Phase Indicator

n. Window Indicator

NOTE: In case of current/voltage phase loss or phase sequence error, both Alarm Indicator (c) and Phase Sequence Error Indicator (e) will blink

6

5. Function
Figure 7 below shows menu map for the power meter. It includes the setting and measurement display for the power meter. These menus can be accessed by pressing NEXT, UP, PROG & DOWN buttons.

Line Current (A)

Min. Current (A)

Max Current (A)

Line Voltage (V)

Phase Voltage (V)

Min. Line Voltage (V)

Min. Phase Voltage (V)

Max Line Voltage (V)

Max Phase Voltage (V)

Power Factor (PF) & Frequency (Hz)

True Power Factor (PF)

Displacement Power Factor (DPF)

Total Power (W, VAR, VA)

Positive Min. Total Power
(W, VAR, VA)

Negative Min. Total Power
(W, VAR, VA)

Positive Max Total Power
(W, VAR, VA)

Negative Max Total Power
(W, VAR, VA)

Real Power (W)

Positive Min. Real Power (W)

Negative Min. Real Power (W)

Positive Max Real Power (W)

Negative Max Real Power (W)

Reactive Power (VAR)

Positive Min. Reactive Power
(VAR)

Negative Min. Reactive Power
(VAR)

Positive Max Reactive Power
(VAR)

Negative Max Reactive Power
(VAR)

Apparent Power (VA)

Positive Min. Apparent Power
(VA)

Negative Min. Apparent Power
(VA)

Positive Max Apparent Power
(VA)

Negative Max Apparent Power
(VA)

Demand (W, VAR, VA)

Max. Demand (W, VAR, VA)

Total Real Energy (kWh)

Total Neg. Real Energy (-kWh)

Total Reactive Energy (kVARh)

Total Neg. Reactive Energy (-kVARh)

Total Apparent Energy (kVAh)

THD Current (A)

THD Voltage (V)

Hour On (Days, Hours, Mins)

Figure 7 : Menu map for normal mode.

7

PROG Mode
CT Ratio Setting (A)
PT Ratio Setting (V )
Neutral Current Setting (Ln)
Setup Communication Configuration
Demand Setting

To change value range 5 – 9999A for primary and 5A for secondary
To change value range 100 – 33kV for primary and 100 – 250V for secondary
Display Neutral Current (Measure / Calculate / Off)

System Setting

Reset All Energy Register
Reset Demand Register
Reset Max/Min
Remote Set

Reset (Yes/No) Reset (Yes/No) Reset (Yes/No)
(ON/OFF)

Scroll Display Setting

To scroll display in idle mode (ON/OFF)

Scroll Delay Time

To set interval time for scroll display (1-10secs)

Reset HourOn Register

Reset (Yes/No)

Backlight Setting

To turn off backlight after minutes of idle (ON/OFF)

Software Version
Figure 8 : Menu map for programming mode

8

6. Setting up
The power meter comes with factory default settings. These values may be changed by navigating to the appropriate screens and entering new values. Use the instructions in the following sections to change the values. 6.1. ACCESS PROGRAMMING MODE
a. Press the PROG button to enter programming mode. The first number will blink to enter password. b. Use the UP or DOWN button to change display value and the NEXT button to shift to next number. c. Press the PROG button to confirm and enter programming mode. Setup CT ratio will be display. If the
password is incorrect, the meter will return to normal mode. d. To exit press the PROG button and display will return to normal mode.
NOTE: Default password is “0000”
6.2. SETUP CT RATIO
a. CT ratio setting is the first item displayed in programming mode. b. Press the NEXT button to change. The first digit will blink. c. Use the UP or DOWN button to change the primary CT value. d. Press the NEXT button for the next digit. Repeat step (b) & (c) to change, or else press PROG button to save
the setting. e. The SAVE window will be prompted. Use the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. f. To proceed next setting press DOWN button. To exit programming mode, press the PROG button. Refer
Section 6.17. NOTE: CT Ratio default value is 5/5A
9

6.3. SETUP PT RATIO
a. Scroll in programming mode until “Pt” is displayed using the UP or DOWN button. b. This parameter is to change the PT value if the Power Transformer (PT) is connected. c. Press the NEXT button to change. The “V” symbol for primary will blink. d. Press the UP or DOWN button to change the value of setting. e. Press the NEXT button to confirm the new setting and proceed for secondary setting. f. Repeat step (c) & (d) to change for secondary. Once confirmed, press the NEXT button again. g. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. h. Use the DOWN button to scroll to next setting. i. To exit programming mode, refer Section 6.17.
NOTE: PT Ratio default value is 100/100V
6.4. NEUTRAL CURRENT
a. Scroll in programming mode until “Ln” is displayed using the UP or DOWN button. b. This parameter is to display neutral current if the neutral current (Ln) is connected. c. Press the NEXT button to change. The “PROG” symbol will blink. d. Press the UP or DOWN button to toggle the symbol “cAL” for calculated value, “MEA” for measured value
or “OFF” to disable. e. Press the NEXT button to confirm the new setting. f. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. g. Use the DOWN button to scroll to next setting. h. To exit programming mode, refer Section 6.17. NOTE: Neutral current default setting is measured value
10

6.5. SETUP COMMUNICATION CONFIGURATIONS
a. Scroll until “ID BRATE PARITY” is displayed using the UP or DOWN button. b. Press the NEXT button. The “PROG” and “-” symbol next to “ID” will blink. Use the UP or DOWN button to
change the device ID. c. Next, press the NEXT button and “-” symbol next to “BRATE” will blink to change baudrate. Repeat step (b)
to change. d. Press NEXT button to change parity and “-” symbol next to “PARITY” will blink. Repeat step (b) to change. e. Then press the NEXT button to confirm new setting. f. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. g. Use the DOWN button to scroll to next setting. h. To exit programming mode, refer Section 6.17.
NOTE: Default value for the communication ID is 1, baudrate is 38400 bps and parity set to no-1 (parity none, stop bit 1).
6.6. DEMAND SETTING
a. Scroll until “DMD” is displayed using the UP or DOWN button. b. Press the NEXT button to change interval value. The “PROG” symbol will displayed and “-” symbol next to
“INT” will blink. c. Use UP or DOWN button to change value and press NEXT button to confirm and change sub-interval setting.
The “-” symbol next to “SUB” will blink. Press UP or DOWN button to change and NEXT button to confirm. d. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. e. Use the DOWN button to scroll to next setting f. To exit programming mode, refer Section 6.17. NOTE: Demand setting default value is 60/4
11

6.7. SYSTEM SETTING
a. Scroll in programming mode until “SYSt sEt” is displayed using the UP or the DOWN button. b. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle 3-phase 4-wire
“3P4r” or 3-phase 3-wire “3P3r” symbols. c. Press the NEXT button to confirm new setting. d. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. e. Use the DOWN button to scroll to next setting. f. To exit programming mode, refer Section 6.17.
NOTE: System setting default value is 3-phase 4-wire
6.8. RESET ALL ENERGY REGISTER
a. Scroll in programming mode until “EnEr rSt” is displayed using the UP or the DOWN button. b. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle “yES” or “no”
symbols. c. To abort clearing energy register values, select “no”. To clear all energy values select “yES”. d. Press the NEXT button to confirm the new setting. e. The rSt dAtA window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the
PROG button to confirm. f. Use the DOWN button to scroll to next setting. g. To exit programming mode, refer Section 6.17.
12

6.9. RESET DEMAND REGISTER
a. Scroll in programming mode until “dMd rSt” is displayed using the UP or the DOWN button. b. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle “yES” or “no”
symbols. c. To abort clearing demand register, select “no”. To clear all demand register select “yES”. d. Press the NEXT button to confirm the new setting. e. The rSt dAtA window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the
PROG button to confirm. f. Use the DOWN button to scroll to next setting. g. To exit programming mode, refer Section 6.17.
6.10. RESET MAXIMUM AND MINIMUM VALUE
a. Scroll until “rSEt” is displayed using the UP or the DOWN button. b. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle “yES” or “no”
symbols. c. To abort clearing max. and min. values, select “no”. To clear all max. and min. values select “yES”. d. Press the NEXT button to confirm new setting. e. The rSt dAtA window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the
PROG button to confirm. f. Use the DOWN button to scroll to next setting. g. To exit programming mode, refer Section 6.17.
13

6.11. REMOTE SET
a. Scroll until “rMt SEt” is displayed using the UP or the DOWN button. b. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle Enable “on”
or disable “oFF” symbols. c. Press the NEXT button to confirm new setting. d. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. e. Use the DOWN button to scroll to next setting. f. To exit programming mode, refer Section 6.17.
NOTE: Enabling the remote set allows the remote terminal to read and write the meter setting via Modbus-RTU, otherwise the setting data can only be read. Default value is ON.
6.12. SCROLL SETTING
a. Scroll in programming mode until “Scrl SEt” is displayed using the UP or the DOWN button. b. This function is to turn ON/OFF scroll mode. If turn on, when the display is idle the meter will shows each
window in normal mode base on the scroll delay setting time. c. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle “oFF” or “on”
symbols. d. Press the NEXT button to confirm the new setting. e. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. f. Use the DOWN button to scroll to next setting. g. To exit programming mode, refer Section 6.17.
NOTE: Scroll setting default value is OFF
14

6.13. SCROLL DELAY SETTING
a. Scroll in programming mode until “Scrl dELY” is displayed using the UP or the DOWN button. b. This function is to set time interval for scroll window. c. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to set 1sec to 10secs
interval. d. Press the NEXT button to confirm the new setting. e. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. f. Use the DOWN button to scroll to next setting. g. To exit programming mode, refer Section 6.17. NOTE: Scroll delay time default value is 10 seconds.
6.14. RESET HOUR-ON REGISTER
a. Scroll in programming mode until “Hron rSt” is displayed using the UP or the DOWN button. b. This function is to clear hour-on register. c. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle “yES” or “no”
symbols. d. To abort clearing hour-on register, select “no”. To clear hour-on register select “yES”. e. Press the NEXT button to confirm the new setting. f. The rSt dAtA window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the
PROG button to confirm. g. Use the DOWN button to scroll to next setting. h. To exit programming mode, refer Section 6.17.
15

6.15. BACKLIGHT SETTING
a. Scroll in programming mode until “bcLt” is displayed using the UP or the DOWN button. b. This function is to turn off backlight after 5 minutes idle. c. Press the NEXT button. The “PROG” symbol will blink. Use the UP or DOWN button to toggle “oFF” or “on”
symbols. d. Press the NEXT button to confirm the new setting. e. The SAVE window will be prompted. Press the UP or DOWN button to select “YES” or “NO”. Press the PROG
button to confirm. f. Use the DOWN button to scroll to next setting. g. To exit programming mode, refer Section 6.17.
NOTE: Backlight setting default value is oFF 6.16. SOFTWARE VERSION
a. Scroll in programming mode until “SoFt VEr” is displayed using the UP or the DOWN button. b. This window will display the current firmware version of the device. c. Use the DOWN button to scroll to next setting. d. To exit programming mode, refer Section 6.17. 6.17. EXIT FROM PROGRAMMING MODE
If PROG button is pressed
a. Use the PROG button exit from programming mode window. The line current window will be displayed.
16

6.18. SETUP THE PASSWORD
a. Press the NEXT and PROG buttons simultaneously until the password ID request window is displayed. Key in the current password. Refer to Section 6.1 on how to do this.
b. After pressing the PROG button, the “nEw id” window will be displayed. At this stage, the user needs to key in the new password. Use the UP or DOWN button to change the digit value and the NEXT button to shift to next digit. Once confirmed, press the PROG button.
c. Next, the “SAVE SEt” will be displayed. Use the UP or DOWN buttons to toggle the “yES” and “no” symbols to save the new password. Once confirmed, press the PROG button and the meter will return to normal display mode.
17

7. Specification
Table 4: Specification Electrical Characteristic System Current Display CT Primary CT Secondary Accuracy Sustained overload Voltage measurement PT Primary PT Secondary Secondary Phase Voltage Accuracy Power (kW,kVAR,kVA) measurement Display
Accuracy Power factor measurement Display Accuracy Frequency measurement Range Accuracy Energy measurement Active Reactive Demand measurement Demand interval Demand sub-interval

3P3W & 3P4W
Three phase current & neutral(selectable) 5-9999A 5A 0.5% (from 1A to 6A secondary) 6A
100-33kV no PT, 100-250V 20~300VAC 0.5%
each phase & total 1%
each phase & total 1%
45 ~ 65 Hz 0.5%
IEC62053-21:Class 1 IEC62053-23:Class 2
60 to 1800 seconds 1 to 120

18

Table 4: Specification (cont) Communication

Hardware Interface

Isolated RS485

Protocol

Modbus-RTU

ID

1 to 254

Baudrate

4800, 9600, 19200, 38400

Parity

None (Stop Bit 1 and 2), even, odd

Operating Condition

Auxiliary Supply

90~415VAC or 100~300VDC

Operating Temperature

-10 C ~ +55 C

Storage Temperature

-20 C ~ +70 C

Operating time (on hour)

Up to 9999 days, 23 hours, 59 minutes.

Mechanical Characteristic

Dimension

Case

L96mm x W96mm x H87.5mm

Mounting type

Panel

LCD view area

76mm x 56.5mm

Weight

390g

Electromagnetic Compatibility (EMC)

Part 6-2: Generic Standards IEC61000-6-2 Immunity for industrial environments

Part 6-4: Generic Standards IEC61000-6-4 Emission standard for industrial environments

19

8. Modbus Data Register

8.1 Data Type

By default, the data format in each register is unsigned 16-bit word. Shorter data may be encoded in the unsigned 8-bit byte format whereas longer data may be encoded either in the unsigned 32-bit double word format, signed 32-bit integer format or signed 64-bit long integer format. Two’s complement is used to represent signed numbers. The nomenclature used in this manual is shown in Table 5.

Table 5: Data length nomenclature

Data Length

Unsigned

Signed

4-bit

nibble

–

8-bit

byte

–

16-bit

word

short

32-bit

dword

int

64-bit

qword

long

For data with length shorter than 16 bits, the upper unused bits, nibbles or bytes can be ignored. In cases where multiple registers are required, the big endian convention shall apply unless otherwise specified.

8.2 List Register Tables 6, 7 and 8 shows the read only variables (function code 0x03 or 0x04) for device & communication info, system status errors, operations, power factor and harmonics data respectively whereas Table 9 shows the read and write variables (function codes 0x03, 0x04 or 0x06) for the settings data.
Table 6: Device and communication register
Read Only (Function 0x03 or 0x04)

0

Reserved

1-3

Device Type

4-5

Version

Read Only (Function 0x03 or 0x04)

1000

Device ID

1-254

1001 1002

Parity Baudrate

1 = none 2 = even
1 = 4800 2 = 9600 3 = 19200 4 = 38400

3 = odd

20

Table 7: System status error register Read Only (Function 0x03 or 0x04)

Register 300

Description System Status Error flag

*if error occured, the bit is set to 1, else bit is 0.

Type word

Range
Error flag * Bit 15 = Voltage Sequence Error Bit 14 = Current Sequence Error Bit 10 = L3 Phase Loss Bit 9 = L2 Phase Loss Bit 8 = L1 Phase Loss Bit 7 = L3 Invalid Power Factor Bit 6 = L2 Invalid Power Factor Bit 5 = L1 Invalid Power Factor

Table 8: Operation data registers

Read Only (Function 0x03 or 0x04)

Register

Description

Type

Min. Unit

40004001 4002-4003 4004-4005 4006-4007 4008-4009 4010-4011 4012-4013 4014-4015 4016-4017 4018 4019 4020-4021 4022-4023 4024-4025 4026-4027 4028-4029 4030-4031 4032-4033

Negative Real Energy
Positive Real Energy
Apparent Energy Negative Reactive Energy Positive Reactive Energy Total Real Power Total Apparent Power Total Reactive Power Total Power Factor Frequency Instantaneous Current L1 Instantaneous Current L2 Instantaneous Current L3 Instantaneous Current Ln Voltage Phase L12 Voltage Phase L23 Voltage Phase L31

dword

1kWh

dword

1kWh

Reserved

dword

1kVAh

dword

1kVArh

dword

1kVArh

int

1W

dword

1VA

int

1VAR

word

0.001

word

0.01Hz

dword

0.001A

dword

0.001A

dword

0.001A

dword

0.001A

dword

0.1V

dword

0.1V

dword

0.1V

Range
0 ~ 1000000M
0 ~ 1000000M
0 ~ 1000000M 0 ~ 1000000M 0 ~ 1000000M -999.9M ~ 999.9M
0 ~ 999.9M -999.9M ~ 999.9M
-1.000 ~ 1.000 45.00 ~ 65.00 0 ~ 999.9kA 0 ~ 999.9kA 0 ~ 999.9kA 0 ~ 999.9kA 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV
21

Table 8: Operation data registers

Read Only (Function 0x03 or 0x04)

Register

Description

4034-4035 4036-4037 4038-4039 4040-4041 4042-4043 4044-4045 4046-4047 4048-4049 4050-4051 4052-4053 4054-4055 4056-4057
40584059
4060-4061
4062-4063 40644065
4066-4067 4068-4069 4070-4071
4072-4073
4074-4075 4076 4077 4078 4079

Voltage Phase L1 Voltage Phase L2 Voltage Phase L3 Real Power L1 Real Power L2 Real Power L3 Apparent Power L1 Apparent Power L2 Apparent Power L3 Reactive Power L1 Reactive Power L2 Reactive Power L3 Total Demand Reactive Power Max.Total Demand Reactive Power
Total Demand Real Power Max. Total Demand Real Power
Total Demand Apparent Power Max. Total Demand Apparent Power
Displacement Power Factor L1 Displacement PF sign L1 Displacement Power Factor L2 Displacement PF sign L2

Type
dword dword dword
int int int dword dword dword int int int
int

Min. Unit
0.1V 0.1V 0.1V 1W 1W 1W 1VA 1VA 1VA 1VAR 1VAR 1VAR
1VAR

Range
0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV -999.9M ~ 999.9M -999.9M ~ 999.9M -999.9M ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M -999.9M ~ 999.9M -999.9M ~ 999.9M -999.9M ~ 999.9M
-999.9M ~ 999.9M

int

1VAR

Reserved

int

1W

int

1W

Reserved

dword

1VA

dword

1VA

Reserved

word

0.001

word

–

word

0.001

word

–

-999.9M ~ 999.9M
-999.9M ~ 999.9M -999.9M ~ 999.9M
0 ~ 999.9M 0 ~ 999.9M
-1.000 ~ 1.000 0=Resistive; 1=ind; 2=cap
-1.000 ~ 1.000 0=Resistive; 1=ind; 2=cap

NOTE: If the display shows “E”, it denotes the value has exceed the range. 22

Table 8: Operation data register (cont) Read Only (Function 0x03 or 0x04)

Register
4080 4081 4082 4083 4084 4085 4086 4087

Description
Displacement Power Factor L3 Displacement PF sign L3 THD Current L1 THD Current L2 THD Current L3 THD Voltage L1 THD Voltage L2 THD Voltage L3

Type
word word word word word word word word

Min. Unit 0.001
0.1% 0.1% 0.1% 0.1% 0.1% 0.1%

4088

Energy Full Flag

word

4089 4090 4091
4092

Power Factor L1 Sign Power Factor L1 Power Factor L2
Sign Power Factor L2

word word word
word

0.001 –
0.001
–

Range
-1.000 ~ 1.000 0=Resistive; 1=ind; 2=cap
0 ~ 1000 0 ~ 1000 0 ~ 1000 0 ~ 1000 0 ~ 1000 0 ~ 1000 Energy flag * bit 7 to 5 = reserved bit 4 = (-)kVARh bit 3 = (-) kWh bit 2 = kVAh bit 1 = (+)kVARh bit 0 = (+)kWh -1.000 ~ 1.000 0=Resistive; 1=ind; 2=cap -1.000 ~ 1.000
0=Resistive; 1=ind; 2=cap

4093

Power Factor L3

word

0.001

-1.000 ~ 1.000

4094

Sign Power Factor L3

word

–

0=Resistive; 1=ind; 2=cap

4095

Sign Total Power Factor

word

–

0=Resistive; 1=ind; 2=cap

4096- 4097 Current L1 Max.

dword

0.001A

4098-4099 4100- 4101 4102-4103

Current L2 Max.

*if the energy is full, the bit is set to 1, else bit is 0.

Reserved

dword

0.001A

Reserved

NOTE: If the display shows “E”, it denotes the value has exceed the range.

0 ~ 999.9kA 0 ~ 999.9kA
23

Table 8: Operation data register (cont)

Register Description

Read Only (Function 0x03 or 0x04) Type Min. Unit

4104- 4105 Current L3 Max.

dword 0.001A

4106-4107

Reserved

4108- 4109 Current Ln Max.

dword 0.001A

4110-4111

Reserved

4112- 4113 Voltage L1 Max.

dword

0.1V

4114-4115

Reserved

4116- 4117 Voltage L2 Max.

dword

0.1V

4118-4119

Reserved

4120- 4121 Voltage L3 Max.

dword

0.1V

4122-4123

Reserved

4124- 4125 Voltage L12 Max.

dword

0.1V

4126-4127

Reserved

4128- 4129 Voltage L23 Max.

dword

0.1V

4130-4131

Reserved

4132-4133 Voltage L31 Max.

dword

0.1V

4134-4135

Reserved

4136- 4137 4138-4139
4140- 4141
4142-4143
4144- 4145 4146-4147 4148- 4149 4150-4151 4152- 4153 4154-4155

Total Positive Real Power Max.
Total Positive Apparent Power Max.
Total Positive Reactive Power Max.
Max. Positive Real Power L1
Max. Positive Real Power L2

int

1W

Reserved

dword

1VA

Reserved

int

1VAR

Reserved

int

1W

Reserved

int

1W

Reserved

NOTE: If the display shows “E”, it denotes the value has exceed the range. 24

Range 0 ~ 999.9kA 0 ~ 999.9kA 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV
0 ~ 999.9M 0 ~ 999.9M
0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M

Table 8: Operation data register (cont) Read Only (Function 0x03 or 0x04)

Register

Description

Type

Min. Unit

4156- 4157 4158-4159 4160- 4161 4162-4163 4164- 4165 4166-4167 4168- 4169 4170-4171 4172- 4173 4174-4175 4176- 4177 4178-4179 4180- 4181 4182-4183 4184- 4185 4186-4187 4188- 4189 4190-4191 4192- 4193 4194-4195 4196- 4197 4198-4199 4200- 4201

Max. Positive Real Power L3
Max. Apparent Power L1
Max. Apparent Power L2
Max. Apparent Power L3 Max. Positive Reactive Power L1 Max. Positive Reactive Power L2 Max. Positive Reactive Power L3 Current L1 Min.
Current L2 Min.
Current L3 Min.
Current Ln Min.
Voltage L1 Min.

int

1W

Reserved

dword

1VA

Reserved

dword

1VA

Reserved

dword

1VA

Reserved

int

1VAR

Reserved

int

1VAR

Reserved

int

1VAR

Reserved

dword

0.001A

Reserved

dword

0.001A

Reserved

dword

0.001A

Reserved

dword

0.001A

Reserved

dword

0.1V

NOTE: If the display shows “E”, it denotes the value has exceed the range.

Range 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9kA 0 ~ 999.9kA 0 ~ 999.9kA 0 ~ 999.9kV 0 ~ 999.9kV
25

Table 8: Operation data register (cont)

Read Only (Function 0x03 or 0x04)

Register

Description

Type

Min. Unit

4202-4203

Reserved

4204- 4205 Voltage L2 Min.

dword

0.1V

4206-4207

Reserved

4208- 4209 Voltage L3 Min.

dword

0.1V

4210-4211

Reserved

4212- 4213 Voltage L12 Min.

dword

0.1V

4214-4215

Reserved

4216- 4217 Voltage L23 Min.

dword

0.1V

4218-4219

Reserved

4220-4221 Voltage L31 Min.

dword

0.1V

4222-4223

Reserved

4224-4225 Total Positive Real Power Min.

int

1W

4226-4227

Reserved

4228-4229 Total Apparent Power Min.

dword

1VA

4230-4231

Reserved

Total Positive Reactive Power

4232- 4233

int

Min.

1VAR

4234-4235

Reserved

4236-4237 Min. Positive Real Power L1

int

1W

4238-4239

Reserved

4240-4241 Min. Positive Real Power L2

int

1W

4242-4243

Reserved

4244-4245 Min. Positive Real Power L3

int

1W

4246-4247

Reserved

NOTE: If the display shows “E”, it denotes the value has exceed the range. 26

Range 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9kV 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M

Table 8: Operation data register (cont)

Register
4248-4249 4250-4251 4252-4253 4254-4255 4256-4257 4258-4259 4260-4261 4262-4263 4264-4265 4266-4267 4268-4269 4270-4271 4272-4273 4274-4275 4276-4277 4278-4279 4280-4281 4282-4283 4284-4285 4286-4287 4288-4289 4290-4291 4292-4293 4294-4295

Read Only (Function 0x03 or 0x04)

Description

Type

Min. Unit

Apparent Power Min. L1

dword

1VA

Reserved

Apparent Power Min. L2

dword

1VA

Reserved

Apparent Power Min. L3

dword

1VA

Reserved

Min. Positive Reactive Power L1

int

1VAR

Reserved

Min. Positive Reactive Power L2

int

1VAR

Reserved

Min. Positive Reactive Power L3

int

1VAR

Reserved

Total Negative Real Power Max.

int

1W

Reserved

Max. Negative Real Power L1

int

1W

Reserved

Max. Negative Real Power L2

int

1W

Reserved

Max Negative Real Power L3

int

1W

Reserved

Total Negative Real Power Min.

int

1W

Reserved

Min. Negative Real Power L1

int

1W

Reserved

NOTE: If the display shows “E”, it denotes the value has exceed the range.

Range 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M
27

Table 8: Operation data register (cont)

Register 4296-4297 4298-4299 4300-4301 4302-4303 4304-4305 4306-4307 4308-4309
4310-4311 4312-4313
4314-4315 4316-4317
4318-4319 4320-4321 4322-4323 4324-4325 4326-4327 4328-4329 4330-4331 4332-4333

Read Only (Function 0x03 or 0x04)

Description

Type

Min. Unit

Min. Negative Real Power L2

int

1W

Reserved

Min. Negative Real Power L3

int

1W

Reserved

Total Negative Reactive Power Max.

int

1VAR

Reserved

Max. Negative Reactive Power L1

int

1VAR

Reserved

Max. Negative Reactive Power L2

int

1VAR

Reserved

Max. Negative Reactive Power L3

int

1VAR

Reserved

Total Negative Reactive Power int
Min.

1VAR

Reserved

Min. Negative Reactive Power int
L1

1VAR

Reserved

Min. Negative Reactive Power int
L2

1VAR

Reserved

Min. Negative Reactive Power int
L3

1VAR

NOTE: If the display shows “E”, it denotes the value has exceed the range. 28

Range 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M 0 ~ 999.9M

Table 9: Setting data register

Register 100 101 102 103 104

Read or write (Function 0x03,0x04 or 0x06)

Description

Range

PT ratio primary

100 ~ 33kV

PT ratio secondary

no PT (`0′), 100 ~ 250V

CT ratio primary

5 ~ 9999A

CT ratio secondary *

5A

Interval Demand

60 ~ 1800s

105

Sub-Interval Demand

106

System Configuration *

107

Backlight setting

108

Scroll interval

109

System scroll setting

110

Neutral setting

111 112 113 114 115 116 * read-only function

Minutes Hours Days Hour-on reset Max. & Min. Demand reset Max. & Min. parameter reset

1 ~ 120
0 = 3P4W 1 = 3P3W
0 = OFF 1 = ON
1 – 10 secs
0 = OFF 1 = ON
0 = OFF 1 = Measured 2 = Calculated
0 – 59 mins
0 – 23 hrs
0 – 9999 days
1 = YES
1 = YES
1 = YES

NOTE: Register list is based on firmware version A1.05

29

9. Maintenance and Troubleshooting
The power meter does not contain any user-serviceable parts. If the power meter requires service, please contact your local sales representative. Do not open the power meter. Opening the power meter voids the warranty.
NOTE: We reserve the right to alter or modify the information contained herein at any time in line with our product development without prior notification. We also reserve the right to discontinue production & delivery of product.
10. Meter Dimension

96mm 90.5mm

96mm Front

87.5mm Side

17mm

90.5mm

1 2 3 4 56 7 8 9 10 11 12 13 14
15 16 17 18 19 20
90.5mm Back

30

11. Appendix

11.1. DEMAND CALCULATION Demand parameters are used to show average values over a demand interval.This power meter using sliding block method. The demand value is based on interval divide by sub-interval time. Example is shown below:

SETTING: Interval time = 180 seconds ; sub-interval = 3

Measurement = interval time / sub-interval = 180 / 3 = 60 seconds

——— is1
60s

is2

60s

is3
60s

is4
60s

is5 ———

60s

——— id1=(is1+is2+is3)/3

id2=(is2+is3+is4)/3 id3=(is3+is4+is5)/3 ———

11.2. DATA READ FORMAT FROM MODBUS a) 4000-4001 : Negative Real Energy
Address 4000

Address 4001

MSB

LSB

MSB

LSB

0x00

0x01

0x23

0x34

Negative Real Energy

= 0x00012334 =74548 x 1kWh (min value) =74548kWh

b) 4012-4013 : Total Real Power; (Signed register)

Address 4012

Address 4013

MSB

LSB

MSB

LSB

0xFF

0xFB

0x6C

0x20

Total Real Power = 0xFFFB6C20

If MSB is “1”, it is negative value;

Total Real Power

= 0xFFFB6C20 x (-1); = 0x493E0; 300 000 = 300000 x 1W(min value) = -300kW

31

11.3. NEUTRAL CURRENT CALCULATION The formula for neutral current, Ln is:
A2 + B2 + C2 – AB – AC – BC where;
A: Current Line 1 (A) B: Current Line 2 (A) C: Current Line 3 (A)
Example Given L1 is 3A, L2 is 6A, L3 is 8A; Substitute into formula; = (3)2 + (6)2 + (8)2 – (2 x 8) – (3 x 8) – (6 x 8) = 4.359 A
12. Version History

Version 1.0 1.1 1.2

Description Released version Added Phase Loss Error functionality, MODBUS register 300 Added stop bit set functionality for none parity communication setting

32

References

• Mikro MSC Bhd

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