Accuenergy DV327-DO, EV390-E1, EV390-E2, EV390-E0, EV390-E3 User manual

EV/DV300 Series Power Meter

Chapter 1: Introduction

V:2.0 Revised October 2018

1

[Cover page]

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EV/DV300 Series Power Meter

Chapter 1: Introduction

V:2.0 Revised October 2018

2

Copyright© 2013 V3.1

This manual may not be reproduced in whole or in part by mimeograph or any other means
without the written permission of Accuenergy Tech.

The information contained in this document is believed be accurate at the time of publication,
however, Accuenergy assumes no responsibility for any errors which may appear here and
reserves the right to make changes without notice. Please ask the local representative for
latest product specifications before ordering.

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Chapter 1: Introduction

V:2.0 Revised October 2018

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Please read this manual carefully before doing installation, operation and
maintenance of the meter. Following symbols are used in this manual and on meter
to alert the dangerous or prompt in the operating or setting process.

Danger symbol, failure to observe the information may result in injury or
death.

Alert symbol, alert the potential danger.

Prompt symbol, this symbol is used where the meter may be damaged.

The meter must be well grounding before being operated or done maintenance.
Installation and maintenance of the meter should only be performed by qualified
personnel that have appropriate training and experience with high voltage and current
device.

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Chapter 1: Introduction

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CONTENTS

Chapter 1: Introduction ................................................................................................... 6

1.1 Description of EV/DV300 ........................................................................................ 6

1.2 Application Area ...................................................................................................... 7

1.3 EV/DV 300 Series .................................................................................................... 7

Chapter 2 Installation .................................................................................................... 10

2.1 Appearance and Dimensions ................................................................................ 10

2.1.1 Appearance .................................................................................................... 10

2.1.2 Dimension (mm) ............................................................................................ 11

2.2 Installation ............................................................................................................ 11

Installation Steps ..................................................................................................... 12

2.3 Wiring .................................................................................................................... 13

Safety Earth Connection ......................................................................................... 14

Auxiliary power ....................................................................................................... 14

Voltage Input........................................................................................................... 15

Current Input........................................................................................................... 16

2.4 I/O Wiring Method ................................................................................................ 18

Chapter 3: Operation and Setting ................................................................................... 24

3.1 Display Panel and Keys .......................................................................................... 24

3.2 Metering Data Reading ......................................................................................... 25

3.3 Meter Parameter Setting ..................................................................................... 29

Chapter 4: Communications ........................................................................................... 38

4.1 Modbus Protocol Introduction ............................................................................. 38

4.2 Format of Communication .................................................................................... 40

4.3 Data Address Table ............................................................................................... 46

Appendix ....................................................................................................................... 51

Appendix A Technical Data and Specification............................................................. 51

Appendix B Ordering Information .............................................................................. 54

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Chapter 1: Introduction

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EV/DV300 Series Power Meter

Chapter 1: Introduction

1.1 Description of EV/DV300

1.2 Application Area

1.3 Meter Overview

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Chapter 1: Introduction

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Chapter 1: Introduction

1.1 Description of EV/DV300

Powerful and Economical

EV/DV300 series power meter is designed for three phase electrical parameter
measurement by using of latest microprocessor and digital signal process
technology. It can True-RMS measure Voltage, Current, Power, Reactive Power,
Power Factor, Frequency and Energy. The meter can be well used in high harmonic
environment especially in middle and low voltage power system, electric
apparatus, power system automation and factory automation. All the measuring
electrical data are available via digital RS485 communication port running
ModbusTM Protocol. The meter also got some flexible I/O ports that made the
metering, monitoring, remote controlling and Analog output in one unit possible.
This can save large cost for user in setting up electric power automation system.

Small Size & Easy Install

EV/DV300 series was designed in compact size DIN96*96 and reduced depth
60mm. It is suitable for small cabin installed in switch gear. Easy install and remove
on panel by using clips.

Display Clear and Easy to Use

Large character LCD characters with blue back light made the display easy to read
even under the dark light. All the Value reading and parameter setting can be
access by using 4 panel keys or communication port. The meter parameters are
protected in EEPROM, which will maintain its content after the meter is power off.

High Level Reliability and Safety

Multi-isolation and anti-interference methods were adopted in the EV/DV design
according to the industry standards. The meter can be installed in hazard industry
area. Also the meter was tested under IEC standards and EMC standards. The
meter house was design by using glass polymer which is durable and inflaming
retarding.

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1.2 Application Area

EV/DV 300 series meter can be used to replace analog meter, panel meter,
transducer and small RTU in power distribution or power automation system.
As it adopted true-RMS measuring method, the EV/DV 300 series are
competent for meauring voltage and current in high distortion nonlinear load

system, such as VVVF, Electric Ballast, Computer etc. It’s application area

includes:

• Power Distribution Automation

• Intelligent Electric Switch Gear

• Industrial Automation

• Building Automation

• Energy Management Systems

• Industry Apparatus

1.3 EV/DV 300 Series

EV 300 series meter has functions of measuring, communication and I/O. EV36x
is single measuring function meter with communication port, while EV38x and
390 is multi-function meter with communication port. For detail please refer to
Table1.1.

DV300 series meter has functions of measuring and AO. DV30x is single
measuring function meter while DV32X and DV330 are multi-function meters.
For detail please refer to Table1.2.

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Chapter 1: Introduction

V:2.0 Revised October 2018

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Item

EV361

EV362

EV382

EV384

EV387

EV390

Metering

Voltage V





Current I





Power P





Reactive Power Q





Apparent Power S





Power Factor PF





Frequency Hz





Energy

Energy kWh









Reactive Energy kVarh









I/O

Digital Input 2 DI





DI Expanding 4 DI





Relay Output/
Energy pulse Output
2 RO/DO





Analog Output/ 24Vdc
Power AO/PO





Comm

RS485 Modbus
Protocol





Metering

Voltage V





Current I





Power P





Reactive Power Q





Apparent Power S





Power Factor PF





Frequency Hz





Energy

Energy kWh







Reactive Energy kVarh







I/O

Analog Output AO





Energy pulse Output
DO





Table 1.1 EV300 Series Power Meter

Function ; Option ; Blank NA

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EV/DV300 Series Power Meter

Chapter 2: Installation

2.1 Appearance and Dimensions

2.2 Installation Steps

2.3 Wiring

2.4 I/O Wiring Method

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Part Name

Description

1. House

Meter house is made of high Strength
inflaming retarding glass-Polymer

2. Front Panel

Front Part of the meter

3. Display panel

LCD display panel

4. Key

Used to change display and setting the
parameters

5. Key door

Used to protect pressing keys by mistake

6. Clip

Used to fasten the meter on the Electric panel

7. Current input terminal

Terminals for Current signal input

8. Terminal for DI

Terminals for 2 DI (DI1, DI2)

9. Terminal for I/O option

Terminals for 4DI(DI3, DI4, DI5, DI6), 2RO/DO
and 2AO/1PO

10. Voltage Input Terminal

Terminals for Voltage input and power supply

11. Terminal for Comm

Terminals for RS485 port

Chapter 2: Installation

2.1 Appearance and Dimensions

2.1.1 Appearance

Table 2.1 Part Name of Meter

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2.1.2 Dimension (mm)

2.2 Installation

Before installation, please make sure that the
environment should satisfy the following conditions.

1. Temperature

EV/DV300 meter’s working temperature range are from

-20℃ to 70℃. If the meter is used beyond this range, it
will result in unnormal performance or even permanent
damage of the meter. EV/DV300 meter’s storage
temperature range is from -40℃ to 85℃。

2. Humidity

EV/DV300 meter’s working humidity is from 0 to 95%

non-condensing.

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3. Position

EV/DV meter should be installed in dry and dust free environment and avoid heat, radiation
and high electrical noise source.

Installation Steps

1. Panel Cutting

2. Secondly, remove the clips from the meter and insert the meter into the square hole
from the front side.

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Chapter 2: Installation

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3. Finally, put clips back to the meter from the backside and push the clips tightly so that the
meter is fixed on the panel.

2.3 Wiring

Terminal Strips

There are 3 groups of terminals on the back of the meter, top, middle and lower one. The top
group is for current input and 2 DIs. The middle group is for IO option and the lower group is
for voltage input and communication.

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Safety Earth Connection

Before doing the meter wiring connection, please
make sure that the switch Panel has a safety Earth
system. Connect the meter safety earth terminal
to the switch gear safety earth system.

The following safety earth symbol is used in the
user’s manual.

Auxiliary power

The auxiliary power supply of the Acuvim meter is
85~264Vac (50/60Hz) or 100~280Vdc. Typical
power consumption of the meter is less than 2.5W.
Other type Aux. Power supply is available on order
option.

Please contact our local sales representative.

Typical wiring of Aux. power supply is as following
Fig 2.8.

DANGER

Only the qualified personnel
could do the wire connection
work. Make sure the power
supply is cut off and all wires
are not live. Failure to observe
it may result in severe injury

NOTE

Make sure the voltage of
power supply is the same as
what the meter needed for its
auxiliary power.

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Voltage Input

Two Voltage Input options of EV/DV300 meter are
100Vac and 400Vac.

100Vac option is suitable for low voltage system
that less than 120Vac in high or medium voltage
system that the secondary of PT is 100Vac.

400Vac option is suitable for low voltage system
that is less than 480Vac. The voltage input could be
directly connected to the terminal of EV/DV300
without the use of PT.

NOTE

The secondary of PT cannot be
shorted, otherwise it may
cause the severe damage of
the instrument.

The wire number of voltage input could be AWG16~22 or 0.6~1.5mm2. A fuse or circuit
breaker should be used in Aux. power supply circuit. Fuse could be selected Long Time Delay
1A/250Vac one. No. 3 terminal must be connected to the safety earth system of switch gear.
An isolated transformer or EMI filter should be used in the auxiliary power supply loop if there
is power quality problem in the power supply. As in Fig 2.9.

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A fuse (1A) or circuit breaker should be used in
voltage input circuit. The wire number of voltage
input could be AWG16~22 or 0.6~1.5mm2

Current Input

In a practical engineering application, CTs should be installed in the loop of measuring.
Normally the secondary of CT is 5A. 1A is possible in the ordering option. A CT of accuracy
over 0.5% (rating over 3VA) is recommended and it will influence the measuring accuracy.
The wire between CT and meter should be as shorter as possible. The length of the wire
may increase the error of the measurement.

The wire number of current input could be
AWG15~16 or 1.5~2.5 mm2.

Wiring of Un

Un is the reference point of electric potential for
measuring. Low resistance may increase the
measuring accuracy. Connecting point of Un has
relation with system wiring method. Please
referring to the wiring diagram.

Wiring of the meter

Wiring method of EV/DV300 series meter will be
introduced in the following paragraph. Please make
sure that the primary and secondary voltage and
current levels of PT and CT are suitable for the
meter. The correctness of measuring result
depends on the correct wiring and parameter
setting of the meter.

NOTE

The CT loop should not be
open circuit in any
circumstance when the power
is on. There should not be any
fuse or switch in the CT loop
and one end of the CT loop
should be connected to the
ground.

Note: The secondary of PT cannot be shorted, otherwise it may cause the severe damage
of the instrument. One end of the PT secondary should be connected to the earth. Please
refer to the wiring diagram.

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1. Wye mode, 3CT
(Wiring mode set 0)

2. Star mode, 2CT
(Wiring mode set 0)

3. Delta mode
(Wiring mode set 2)

4. Star mode
(Wiring mode set 1)

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5. Single Phase 2 wire
(Wiring mode set 0)

6. Single Phase 3 wire
(Wiring mode set 0)

2.4 I/O Wiring Method

I/O option for EV/DV300 series meter can be 6 digital input, 2 relay output (or 2DO), 2 analog
output (or 1PO) and a RS485 communication port.

Digital Input

There are 2 digital inputs in the EV300 series meter (can be extended to 6 digital input) can
be used as monitoring switch status and other digital input. DI1, COM1 (17, 18), DI2,
COM2(19,20), DI3, COM3 (21, 23), DI4, COM3 (22, 23), DI5, COM4 (24, 26), DI6, COM4 (25,

26) are the terminal name and number. DI3 and DI4 use COM3 together while DI5 and DI6
use COM4. The simplified digital input diagram is as Fig 2.15:

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The voltage of the power supply connected with switch K is 16~30Vdc. The DI voltage can be
higher for purpose of anti-noise if the loop is too long, but the Max current should be less
than 10mA.

The wire number of DI could be AWG22~16 or 0.5~1.5mm2.

Relay Output

There are 2 optional relay output used for electric switch control in EV300. Terminal name
and number are R11, R12 (27,28) and R21, R22 (29,30).

The 2 relays are form A or form B and 5A/250Vac or 5A/30Vdc. Please use intermediate relay
when use them to control the electric switch.

There are two relay output modes for selection, one is latching, and the other is momentary.
For the latching mode, the relay can be used to output two status on or off. For the
momentary 23 EV/DV Series mode, the output of the relay changes from off to on for a period
of time Ton and then goes off. Ton is fixed to 800ms.

The wire of relay output should be choosing between AWG22~16 or 0.5~1.5 mm2.

Digital Output

There are two optional digital outputs used for energy pulse output in EV/DV300 series meter,
DO1 is active energy output, and DO2 is reactive energy output. The terminal name and
number are DO1+, DO1-(27,28) and DO2+,DO2-(29,30).

Pulse constant is related to ordering specification, the relationship is as follow:
100V/5A:20000; 400V/5A:3200; 400V/1A:20000;100V/1A:80000.

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Digital outputs work in an open collector mode with electric coupling, The simplified circuit is
shown as Fig 2.18.

Analog Output

There are two optional analog output in EV/DV300 series meter used in DCS or industry
monitoring system. The analog output can be assigned to a metering parameter over front
keys or communication. Please refer to Chapter 3.

The analog output mode can be anyone of 4~20mA, 0~1mA or 0~5V. The simplified circuit
diagram is as in Fig 2.17. The default is 4~20mA. Other output mode can be selected at
ordering.

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The max AO load for the 3 modes are,

4~20mA:

Max load resistor 500Ω

0~1mA:

Max load resistor 10kΩ

0~5V:

Max current 20mA

No.

Parameter

No.

Parameter

No.

Parameter

No.

Parameter

No.

Parameter

No.

Parameter

1

U1 2 U2 3 U3 4 U12

5

U23

6

U31

7

I1 8 I2 9 I3

10

Uavg

11

ULavg

12

Lavg

13 P 14 Q 15 S 16 F 17

PF

18

In

Example:

Alarming parameter:

I1,

Time limit:

15s,

Alarm output relay:

RO1,

Rating of CT1 of I1:

200A,

Value limit:

180A.

24Vdc Power Supply

There is an 24Vdc power supply in IO extend of EV300 series. The terminal name and number
is AO2+, AO2- (33, 34), corresponding with (24V+, 24G). The voltage output range is 24V
(±10%), power rating is 2W and isolate voltage is 1000Vdc.

Note: Only one option can be chosen between 24Vdc power supply and Analog output.

Alarm Output

There is an alarm function in EV300 series meter. The alarm will be triggered when a metering
parameter is over the limit value and over the setting time limit. The alarm can be related to
relay output or LCD back-light flashing. The setting of alarm is as following:

1. Set the relay output mode as alarm. (RO=2).

2. Assign metering parameter to alarm. (Refer Table 2-2)

3. Set alarm value limit.

4. Set alarm time limit. (Min time:1s, Range: 0~255s)

5. Sign of the inequation. (0: parameter value limit)

6. Relate to relays. (0:RO1, 1: RO2, 2: RO1 and RO2)

For register of setting parameters please refer to 4.3 of this manual. Serial number versus
alarming parameter is listed in Table 2.2. Number 0 means no parameter is assigned to alarm.

Table 2.2 No. versus alarm parameter

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The setting of alarm is as following:

1. Set the relay output mode as alarm. RO=2

2. The serial number of I1 is 7 from Table 2.2.

3. CT1=200, the equation converting between real value and register value is:

Real value = (value in register×CT1÷5 )÷1000

4. Time limit is 15s. The register value is 15.

5. The value is high limit, so the sign of in equation is 1 (great than). The alarm happens

when register value > 4500.

6. The alarm relating relay is RO1, so the RO select 0. After finish above setting, the

alarm will trigger RO1 and back-light flashing when value of I1 is over 180A and last
over 15 seconds.

Communication

The communication port and protocol of EV/DV300 are RS485 and Modbus-RTU. The
terminals of communication are A, B, and S (11, 12, 13). A is differential signal +, B is
differential signal -, and S is connected to shield of twisted pair cable. Up to 32 devices can
be connected on a RS485 bus. Use good quality shielded twisted pair cable, AWG22 (0.5mm2)
or larger. The overall length of the RS485 cable connecting all devices cannot exceed 1200m
(4000ft). EV/ DV300 is used as a slave device of master like PC, PLC, data collector or RTU.

If the master does not have RS485 communication port, a converter has to be used. Normally
a RS232/RS485 or USB/RS485 is adopted. The topology of RS485 net can be line, circle and
star

The recommendations for the high-quality communication:

• Good quality shielded twisted pair of cable AWG22 (0.6mm2) or larger is very

important.

• The shield of each segment of the RS485 cable must be connected to the ground at

one end only.

• Keep cables away as much as possible from sources of electrical noise.

• Use RS232/RS485 or USB/RS485 converter with optical isolated output and surge

protection.

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EV/DV300 Series Power Meter

Chapter 3: Operation and Setting

3.1 Display Panel and Keys

3.2 Metering Data Reading

3.3 Meter Parameter Setting

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Chapter 3: Operation and Setting

3.1 Display Panel and Keys

There are one LCD display panel and four operation keys in the front of EV/DV300. All the
segments in LCD display panel are display in Fig 3.1.

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No.

Display

Meaning

Description

1

Data display

Display metering data

V, I, P, PF, F, kWh etc.

2

Load Nature

Inductive or capacitive load

3

Icons of
communication

No icon display: No
communication data

One display: Receiving data

Two display: Receiving and
transmiting data

4

DI Status
Switch 1-6: DI1-DI6

5

Unit

Indicate metering data unit

Table 3.1 Some symbols on LCD panel

There are four fine keys labeled as , E, P and V/A. Use these four keys to read metering
data and do parameter setting.

The description in the following is based on EV390 meter. Other type of meter may lack
some functions.

3.2 Metering Data Reading

In normal condition, the EV/DV300 meter is in the state of display the metering data, such
as Voltage, current and power etc. To read the metering data simply press the keys E, P, and
V/A.

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Press V/A to read voltage and current in the
metering data area.

The first screen: display U1, U2, U3 and
Uavg as in Fig 3.2. U1=100.3V; U2=100.1V;
U3=100.2V; communication state normal;
DI1, DI2, DI3 and DI4 open; DI5 and DI6
close.

Press V/A key go to the second screen.
Note: Communication and DI states display
in each screen.

The Second screen: display line to line
voltage U12, U23 and U31. As in Fig 3.3:
U12=173.2V, U23=173.3V, U31=173.1V;
communication state normal; DI1, DI2, DI3
and DI4 open; DI5 and DI6 close.

Press V/A key, go to the third screen.

The third screen: display current of each
phase I1, I2, I3. As in Fig 3.4, I1=2.498A,
I2=2.499A, I3=2.491A, communication
status normal; DI1, DI, DI3 and DI4 open; DI5
and DI6 close.

Press V/A, go to the forth screen.

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The forth screen: display average phase
voltage, line voltage and current of 3 phase,
Uavg, Ulavg, and Iavg. As in Fig 3.5:
Uavg=100.2V, Iavg=2.496A, Ulavg=173.2V;
communication status normal; DI1, DI2, DI3
and DI4 open; DI5 and DI6 close. Press V/A
key, go to back to the first screen.

Press P key: display power, frequency,
power factor in metering data area.

The first screen: display real power P,
reactive power Q and apparent power S. As
in Fig 3.6: P=0.375kW, Q=0.649kVar,
S=0.749kVA; communication status normal;
DI1, DI2, DI3 and DI4 open; DI5 and DI6
close.

Press P key, go to the second screen.

The second screen: display real power P,
frequency F and power factor PF. As in Fig

3.7: P=0.375kW, F=50.00Hz, PF=0.500;
inductive load; communication status
normal; DI1, DI2, DI3 and DI4 open; DI5 and
DI6 close.

Press P key, go back to the first screen.

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Press E key: display real energy and reactive
energy in metering area.

The first screen: display real energy. As in Fig

3.8: Ep=38106.1kWh. Max energy counter is

99999999.9kWh, it will go to 0 if the counter
is over that value. The first line is the highest
bits while the third line is the lowest bits of
energy counter.

Press E key, go to the second screen.

The second screen: display reactive energy
Eq. As in Fig 3.9: Eq=15521.7kVarh. Max
reactive energy counter is 99999999.9
kVarh, it will go to 0 if the counter is over
that value. The first line is the highest bits
while the third line is the lowest bits of
reactive energy counter.

Press E key, go back to the first screen.

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3.3 Meter Parameter Setting

Under the data display mode, press and V/A
keys simultaneously, get into the meter
parameter setting mode.

In the meter parameter setting mode, press
key to move cursor. Right move one digit
each time.

Press E key for increasing and press P key for
decreasing.

Press V/A key once for acknowledgment and
press V/A key again going to the next setting
page. Press and V/A keys simultaneously to
exit in any setting mode page.

Press and V/A keys simultaneously, go
into the parameter setting mode.

The first display page is communication
address. As in Fig 3.10, the address is 17.
Then after 3 Seconds, the display will
automatically go to the access code page.

NOTE

The setting should be done by
the professional after he has
read this manual.

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Access code is needed for going into the
parameter setting mode. Only the person
who knows the access code can do the
parameter setting. The access code is 4
digits decimal number. It is from 0000 to

9999. The factory default is 0000. After key
in the right access code, press V/A to go to
the first parameter setting page, otherwise
go back to the metering data display page.

The first screen: Setting address for
communication purpose in this page. It is
any digit number from 1 to 255. As in Fig

3.12, the address is 17. Changing method
is simple, press key to move cursor to the
digit need to change and press E key for
increasing or P key for decreasing. Then
press V/A key for acknowledgment and
go to the next setting page.

Note: Each meter on the same RS485 net
should has different address according to
the Modbus-RTU protocol.

The second screen: Baud rate setting page.

The communication protocol Modbus. RTU
in meter is based on asynchronous mode: 8
data bit, no parity, 1 start bit and 1 stop bit.
Baud rate could be one of the five, 1200,
2400, 4800, 9600, 19200 bps. As in Fig 3.13,
the baud rate is 9600 bps. Press E key to
select one baud rate. Press V/A key, go to
the next setting page.

Note: Please use the same baud rate in
meters on the same communication net.

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The third screen: PT primary rating voltage
PT1 setting page.

PT1 value is an integer from 100 to 500,000.
The unit is volt. As in Fig 3.14, PT1=1000V.
Use key for moving cursor, E key for
increasing and P key for decreasing. Press
V/A key, go to the next page.

Note: If there is no PT used in power system,
PTI and PT2 should be the same and equal
to the rating voltage.

The forth screen: PT secondary setting
page. PT2 value is an integer from 100 to

400. The unit is volt. As in Fig 3.1,
PT2=100V. Use key for moving cursor, E key
for increasing and P for decreasing. Press
V/A key, go to the next page.

Note: If there is no PT used in power
system, PTI and PT2 should be the same
and equal to the rating voltage.

The fifth screen: CT primary setting page.

CT1 value is an integer from 5 to 10000. The
unit is Amp. As in Fig 3.16, CT1=5A. Use key
for moving cursor, E key for increasing and P
key for decreasing.

Press V/A key, go to the next page.

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The sixth screen: CT secondary setting page.
The default value of CT2 is 5A. 1A input is for
option. As in Fig 3.17, CT2=5.

Press V/A key, go to the next setting page.

The seventh screen: wiring setting page.

There are 3 kinds of wiring type in EV/DV300
meter, 3 phase 4 wire (0), 3 phase 3 wire
direct connection (1), 3 phase 3 wire
connection with 3CTs.

Press and E key to change wiring Type.
Press V/A key for acknowledge and go to the
next setting page.

The eighth screen: Relay output mode
setting (this setting will be inoperative if
Digital output is selected).

There are 2 working mode for the 2 relay
outputs. One is Latching, the other is
momentary. For the latching mode, the
relay can be used as to output 2 status on or
off. For the momentary mode, the output of
the relay changes from off to on for a period
of time Ton and then goes off. Ton=800ms.
0: latching, 1: momentary, 2: alarm. Use
and E key to change the relay output
working mode.

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When setting the relay output working as
alarm output, the value should be set as 2.

Press V/A key, go to the next page.

The ninth screen: Analog output 1 (AO1)
setting (this setting will be inoperative if PO is
selected).

Analog output can be assigned to any one of
17 metering parameter, U1, U2, U3, U12, U23,
U31, I1, I2, I3, Uavg, Ulavg, Iavg, P, Q, S, F and
PF. The number is from 0 to 16 respectively. As

The tenth screen: Analog output 2 (AO2)
setting

Analog output can be assigned to any one of
17-metering parameter. The number is from 0
to 16 respectively. As in Fig 3.20, the AO2 is
assigned to Iavg. The number is 12. Parameter
table 0 U1 No. Data 1 U2 2 U3 3 U12 4 U23 5
U31 6 I1 7 I2 8 I3 9 Uavg 10 ULavg 11 Iavg 13
Q 14 S 12 P Table 3-2 Parameter table 15 F 16
PF

Note: The Analog output mode can be chosen
when ordering from 1 of the 3, 4-20mA, 0­1mA, 0-5V

in Fig 3.20, the AO1 is assigned to U12. The number is 3.

The parameter table is displayed in Table 3-2.

Parameter table

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The relation between metering parameter and output is illustrated in Fig 3.22, 3.23, 3.24.

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The eleventh screen: real energy presetting
page. Use , E and P key to preset the value
of energy. As in Fig 3.25, the energy value is

8848.3kWh.

Press V/A to acknowledge and go to the next
setting page.

The twelfth screen is reactive energy setting
page. Use , E and P key to preset the
energy value. As in Fig 3.26, the reactive
energy is 0.0 Kvarh.

Press V/A key to acknowledge.

The thirteenth screen is LCD back light time
setting page. To reduce power consumption
and increase the duration of the device, the
backlight will turn off automatically if there is
no key pressed down within a time interval,
when any key is pressed down at any time, it
will turn on immediately. The time interval can
be set from 0 to 120 (minutes), when it is set
to 0, the backlight will be always on. And the
default is 2.

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The fourteenth screen: access code setting
page.

This is the last setting page. The access code
is set in this page. As in Fig 3.28, the access
code is 0001. Press V/A key, go back to the
first page.

Parameter

Range

Default

Access code

0~9999

0

Address

1~255

1

Baud rate

1200, 2400, 4800, 9600, 19200

19200

PT1

100~500000

400

PT2

100~400

400

CT1

5~9999

5

CT2

5 (1 for option)

5

RO

0~1

0

AO1

0~16

0

AO2

0~16

0

Real energy

0~99999999.9

0

Reactive energy

0~99999999.9

0

All the parameter is set till now. Press and V/A key simultaneously, exit setting mode
and back to the metering data display page.

The setting page may be different depending on the meter type. Please confirm the meter
type before doing the parameter setting.

Note: Press key in the value inside the range of parameter define in Table 3.3. The
parameter will return to default value if key in over range value.

Table 3.3 Range and default value of parameter

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EV/DV300 Series Power Meter

Chapter 4: Communications

4.1 Introducing Modbus Protocol

4.2 Format of Communication

4.5 Data Address Table

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Coding System

8-bit binary

Start bit

1

Data bits

8

Parity

NO parity

Stop bit

1 bit

Error checking

CRC (Cyclical Redundancy Check)

Address

Function

Data

Check

8-Bits

8-Bits

N x 8-Bits

16-Bits

Chapter 4: Communications

4.1 Modbus Protocol Introduction

The Modbus RTU protocol is used for communication in EV300 series meter. The data format
and error check field are defined in Modbus protocol. The half-duplex query and respond
mode is adopted in Modbus protocol. There is only one master device in the communication
net. The others are slave devices waiting for the query of the master.

1. Transmission mode

The transmission mode defines the data structure within a frame and the rules used
to transmit data. The mode is defined in the following table that is compatible with
Modbus RTU mode.

2. Protocol

2.1 Frame

The message frame should contain four parts, address of the slave device, function
code define action of slave device, data of action and error check field.

Table 4.1 Data Frame

2.2 Address field

The address field of a message frame contains eight bits. Valid codes are in the range
of 0-255 decimal. When a message is sent from a master to a slave device the function
code field tells the slave what kind of action to perform.

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Code

Meaning

Action

01

Read RO Status

us Obtain current status of Relay Output (ON/OFF)

02

Read DI Status

Obtain current status of Digital Input (ON/OFF)

03

Read data

Obtain current binary value in one or more registers

05

Control RO

Force Relay to a state of on or off (ON/OFF)

16

Preset Registers

Place bin value into consecutive Mutiple-Register

2.3 Function code

The function code field of a message frame contains eight bits. Valid codes are in the
range of 1-255 decimal. When a message is sent from a master to a slave device the
function code tells the slave what kind of action to perform.

Table 4.2 Function code

2.4 Data Field

The data field of message send from a master to slave device or from slave to master
contain additional information which the slave must use to take the action defined by
the function code or the result of action.

2.5 Error Check field

This field permits to check error during the data transmit process. A group of data
transmit from one device to the other may get error as there exist noise in transmission
line. The receiving device will not respond to the error message. The error check field
is based on a Cyclical Redundancy Check (CRC16) method.

3. Error Check

Error checking field is based on a Cyclical Redundancy Check (CRC) method. The CRC field
checks the contents of the entire message. It is applied regardless of any parity check method
used for the individual characters of the message. The CRC field is two bytes, containing a 16­bit binary value. The CRC value is calculated by the transmitting device, which appends the
CRC to the message.

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Addr

Fun

Data

start reg

hi

Data

start reg

lo

Data #of

regs hi

Data #of

regs lo

CRC16

hi

CRC16

lo

06H

03H

00H

00H

00H

21H

84H

65H

Addr:

address of slave device

Fun:

Function code

Data start reg hi

Start register address high (high byte)

Data start reg lo

Start register address high (low byte)

Data #of reg hi

Number of register (high byte)

Data #of reg lo

Number of register (low byte)

CRC16 Hi:

CRC (high byte)

CRC16 Lo:

CRC (low byte)

The receiving device recalculates a CRC during receipt of the message, and compares the
calculated value to the actual value it received in the CRC field. If the two values are not equal,
an error results.

The CRC is started by first pre-loading a 16-bit register to all 1’s. Then a process begins of
applying successive 8-bit bytes of the message to the current contents of the register. Only
the eight bits of data in each character are used for generating the CRC. Start and stop bits,
and the 51 EV/DV Series parity bit, do not apply to the CRC. During generation of the CRC,
each 8-bit character is exclusive ORed with the register contents. Then the result is shifted in
the direction of the least significant bit (LSB), with a zero filled into the most significant bit
(MSB) position. The LSB is extracted and examined. If the LSB was a1, the register is then
exclusive ORed with a preset, fixed value. If the LSB was a 0, no exclusive OR takes place. This
process is repeated until eight shifts have been performed. After the last (eighth) shift, the
next 8-bit byte is exclusive ORed with the register current value, and the process repeats for
eight more shifts as described above. The final contents of the register, after all the bytes of
the message have been applied, is the CRC value. When the CRC is appended to the message,
the low-order byte is appended first, followed by the high-order byte.

4.2 Format of Communication

Explanation of frame (Hex)

Table 4.3 Frame example

In Table 4.3, the meaning of each abbreviated word is,

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Addr

Fun

Data

start reg

hi

Data

start reg

lo

Data #of

regs hi

Data #of

regs lo

CRC16

hi

CRC16

lo

11H

01H

00H

00H

00H

02H

BFH

5BH

Addr

Fun

Byte Count

Data

CRC16

hi

CRC16

lo

11H

01H

01H

02H

D4H

89H

0 0 0 0 0 0 DO2

DO1 0 0 0 0 0 0 1 0

MSB

LSB

1. Read Status of Relay (function code 01)

Query

Query message is sent from master to slave device. This function code is used to read status
of Relay Output in slave device. (1=ON,0=OFF), There are 2 relays in the meter. The address
of each relay is Relay1=0000H and Relay2=0001H.

Table 4.4 Example of read RO status from slave No.17.

Response

Response frame message is from slave to master device. The frame includes address, function
code, quantity of data byte, the data and CRC error checking. The data byte contains the
information of status of 2 Relays. The last 2 bits tells the status of Relays. Relay 1 status relates
to LSB and Relay 2 to next left bit of LSB. (status Off=0 and on=1)

Table 4.5 Example response of reading status of Relays.

The content of Data byte

Table 4.5 Read status of Relay1 and Relay2

(Relay1 = OFF, Relay2=ON)

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Addr

Fun

DI start
addr hi

DI start
addr lo

Data

num hi

DI num

lo

CRC16

hi

CRC16

lo

11H

02H

00H

00H

00H

04H

7BH

59H

Addr

Fun

Byte Count

Data

CRC16

hi

CRC16

lo

11H

02H

01H

03H

E5H

49H

0 0 0 0 DI4

DI3

DI2

DI1 0 0 0 0 0 0 1 1

MSB

LSB

2 Read status of Digital Input (function code 02)

Query

This function is used to read the status of DI ON/OFF (1=ON, 0=OFF). The frame message
contains slave device address, function field, quantity of data characters, data characters and
error checking. The address of DI status start from 0000H (DI1=0000H, DI2=0001H,
DI3=0002H, DI4=0003H, DI5=0004H, DI6=0005H).

Table 4.6 Example of reading DI1 to DI4 status of slave device 17.

Response

The response of DI status query includes address, function code, data count, data and error
check. All DI status relate to one byte. The DI1 to DI4 starts from the last bit of the byte (1=ON,
0=OFF). As in Table 4.7, DI1=ON, DI2=ON, DI3=OFF and DI4=OFF.

Table 4.7 Example of response to query of DI1 to DI4 status.

Data byte

Table 4.7 Response to query of DI1 to DI4

(Relay1 = OFF, Relay2=ON)

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Addr

Fun

Data

start reg

hi

Data

start reg

lo

Data #of

regs hi

Data #of

regs lo

CRC16

hi

CRC16

lo

11H

03H

01H

10H

00H

03H

07H

62H

Addr

Fun

Byte

count

Data1

hi

Data1

lo

Data2

hi

Data2

lo

Data3

hi

Data3

lo

CRC16

hi

CRC16

lo

11H

03H

06H

03H

E8H

03H

E7H

03H

E9H

FDH

9CH

3. Read Data (function code 03)

Query

This function code is used to read the metering data in meter. Table 4.8 Example of reading
3 metering data U1, U2 and U3. The register address is, U1: 0110H, U2: 011H and U3:
0112H.

Table 4.8 Query of Reading U1, U2 and U3

Response

The response includes Address of slave device, function code, data register start address,
number of metering data and error check.

Table 4.9 Example of response of reading U1, U2 and U3 (U1=03E8H (100.0V),
U2=03E7H(99.9V), U3=03E9H(100.1V)).

Table 4.9 Response of reading U1, U2 and U3

4. Control Relay (function code 05)

Query

This message forces single Relay either ON or OFF. The start address of Relay is from 0000H.
(Relay1= 0000H, Relay2=0001H).

The data value FF00H will set the Relay ON and the value 0000H will turn it OFF. All other
values are illegal and will not affect that Relay.

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Addr

Fun

DO addr

hi

DO addr

lo

Value hi

Value lo

CRC16

hi

CRC16

lo

11H

05H

00H

00H

FFH

00H

8EH

AAH

Addr

Fun

DO addr

hi

DO addr

lo

Value hi

Value lo

CRC16

hi

CRC16

lo

11H

05H

00H

00H

FFH

00H

8EH

AAH

Table 4.10 Control Relay query message

Response

The normal response to the request is to retransmit back the message received after the
Relay status has been altered.

Table 4.11 Response of control Relay query

5. Pre-set Multi-register (function code 05)

Query

Function code 16 can be used to modify the contents of multi-register. Any meter parameter
or energy data can be pre-set into its register.

Table 4.11 Example pre-setting energy data of slave device to 17807783.3kWh. As real energy
data = energy data in registerX0.1kWh, the data preset into the register is 178077833. Its Hex
value is 0A9D4089H. The register address is 010CH and 010DH, total 4 bytes.

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Addr

Fun

Data start

reg hi

Data start

reg lo

Data #of

regs hi

Data #of

regs lo

Byte count

hi

11H

10H

10H

0CH

00H

02H

04H

Value hi

Value lo

Value hi

Value lo

CRC16

hi

CRC16

lo

40H

89H

0AH

9DH

A9H

89H

Addr

Fun

Data

start reg

hi

Data

start reg

lo

Data #of

regs hi

Data #of

regs lo

CRC16

hi

CRC16

lo

11H

10H

01H

0CH

00H

02H

82H

A7H

Table 4.12 Preset multi-register

Response

The response message includes address of slave device, function code, data start register,
data number and error checking.

Table 4.13 Preset multi-register

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Address

Parameter

Range

Object

Type

Access

0110H

Phase Voltage U1

0~65535

Word

R

0111H

Phase Voltage U2

0~65535

Word

R

0112H

Phase Voltage U3

0~65535

Word

R

0113H

Line Voltage U12

0~65535

Word

R

0114H

Line Voltage U23

0~65535

Word

R

0115H

Line Voltage U31

0~65535

Word

R

0116H

Current I1

0~65535

Word

R

0117H

Current I2

0~65535

Word

R

0118H

Current I3

0~65535

Word

R

0119H

Average phase voltage Uavg

0~65535

Word

R

011AH

Average line voltage Ulavg

0~65535

Word

R

011BH

Average current Iavg

0~65535

Word

R

011CH

Power P

-32768~32767

Integer

R

011DH

Reactive Power Q

-32768~32767

Integer

R

011EH

Apparent Power S

0~65535

Word

R

011FH

Frequency F

4400~6500

Word

R

0120H

Power factor PF

-1000~1000

Integer

R

0121H

Load nature RT

76/67/82 (L/C/R)

Word

R

0122H

Analog output 1 AO1

0~65535

Word

R

0123H

Analog output 2 AO2

0~65535

Word

R

0124H

Neutral current In

0~65535

Word

R

Energy Data (read by using function code 03, writing by using function code 16)

010CH (Low 16 bit)

Energy Ep

0~999999999

Dword

R/W

010DH (High 16 bit)

010EH (Low 16 bit)

Reactive energy Eq

0~999999999

Dword

R/W

010FH (High 16 bit)

4.3 Data Address Table

Basic metering data

All the measuring data in this register area are stored in this register area and are read by
using function code 03.

Table 4.14 Metering data address table

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Parameter

Relation

Unit

U1, U2, U3, Uavg U12 U23,
U31, Ulavg

Val_r= Val_cX (PT1 / PT2) /10

Volt
I1, I2, I3, Iavg, In

Val_r = Val_c X(CT1/5) /1000

Amp

P, Q, S

Val_r = Val_c X (PT1 / PT2) X (CT1/5)

Watt, Var, VA

PF

Val_r = Val_c / 1000

NA

F

Val_r = Val_c / 100

Hz

Load nature RT

ASCII L(4CH), C(43H), R(52H)

NA

Ep, Eq

Val_r = Val_c / 10

Kwh, Kvah

A (4~20mA)

Val_r = Val_c / 1000

mA

AO (0~1mA)

Val_r = Val_c / 10000

mA

AO (0~5V)

Val_r = Val_c / 1000

Volt

Address

Parameter

Access

Range

Type

0101H

Access code

R/W

0~9999

Word

0102H

Address

R/W

1~255

Word

0103H

Baud rate

R/W

1200, 2 400, 4800, 9600, 19200

Word

0104H

PT1 (Low)

R/W

100~500000

Dword

0105H

PT1 (High)

R/W

0106H

PT2

R/W

100~400

Word

0107H

CT1

R/W

5~9999

Word

0108H

CT2

R/W

5

Word

0109H

Relay output

mode

R/W

0-Latch, 1-Monmentary, 2-Alarm

Word

010AH

AO1 to parameter

assignment

R/W

0-U1

1-U2

2-U3

3-U12

4-U23

5-U31

6-I1

7-I2

8-I3

9-Uavg

10-Ulavg

11-Iavg

12-P

13-Q

14-S

15-F

16-PF

Word

010BH

AO2 to parameter

R/W

Same as AO1

Word

0130H

LCD Back Light

Time

R/W

0~120

Word

The relation between real value (Val_r) and communication value (Val_c)

Table 4.15 The relation between real value and communication value

Meter parameter area

The meter parameters are stored in this area. The register is read by using of function code
03 and write in function code 16.

Table 4.16 parameter register address table

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Address

Parameters

Access

Range

Data Type

0200H

Wiring mode

R/W

0~3 phase 4 wire,1~3 phase 3
wire Integer direct connection,
2~3 phase 3 wire connection with
3PTs

Integer

0201H

Alarm parameter

R/W

0~18

Integer

0202H

Alarm limit value

R/W

-32768~32767

Integer

0203H

Alarm time

R/W

0~255

Integer

0204H

Inequation Sign

R/W

0:<limit value, 1:> limit value

Integer

0205H

Alarm ralate RO

R/W

0-RO1, 1-RO2, 2-RO1 and RO2

Integer

Address

Parameters

Range

Data Type

Access

0000H

DI1

1 = ON, 0 = OFF

Bit

R/W

0001H

DI2

1 = ON, 0 = OFF

Bit

R/W

0002H

DI3

1 = ON, 0 = OFF

Bit

R/W

0003H

DI4

1 = ON, 0 = OFF

Bit

R/W

0004H

DI5

1 = ON, 0 = OFF

Bit

R/W

0005H

DI6

1 = ON, 0 = OFF

Bit

R/W

Alarm data

Alarm related parameter and data store in this area. Function code 03 and 16 are used to
read and write data respectively.

Table 4.17 Alarm parameter and data

Digital Input (DI)

The Digital Input status are read in this area. Function code 02 is used to read the register

Table 4.18 Digital input status

Relay status

The relay status register are in this area. Function code 01 and 05 are used to read the
register and force the relay.

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Address

Parameters

Range

Data Type

Access

0000H

Relay 1

1 = ON, 0 = OFF

Bit

R/W

0001H

Relay 2

1 = ON, 0 = OFF

Bit

R/W

Table 4.19 Relay output address table

Note:

1. Object type: Bit-binary bit, Word-unsigned integer of 16 bit, Integer-Sign integer of

16 bit, Dwordunsigned integer of 32 bit

2. Type of Access: R-Read only, Digital input Relay statue and Data are read by using of

function code 02, 01 and 03 respectively. R/W-Read and Write, Data is written by
using function code 16 and control command is written by using function code 05.
Writing to read only field is forbidden.

3. Energy data is represented in 32 bit. Both high 16 bit and low 16 bit have successive

address alone. The high 16 bit data should be multiplied by 65536 and plus low 16 bit
data to get the energy data in master software. The unit is 0.1kwh or 0.1kvarh. It will
be clear to zero and start again when energy data accumulate to 1x109 kWh (kVarh).
The energy register can be cleared or preset over communication.

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EV/DV300 Series Power Meter

Appendix A Technical Data and Specifications

Appendix B Ordering Information

Appendix

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51

Voltage Input

Voltage rating

-100V

100Vac nominal F.S.input,Vln with 20%
overrange

100Vac nominal F.S.input,Vll with 20%
overrange

-400V

400Vac nominal F.S.input, Vln with 20%
overrange

400Vac nominal F.S.input,Vll with 20%
overrange

Frequency range

45~65Hz

Overload

2 times for continue, 2500VAC/1sec (none
recurrence)

Voltage range over PT

500kV highest at primary side

PT burden

<0.2VA

Measuring

True-RMS

Current input

Current rating

5Amp

5Amp AC nominal F.S.input, with 20% over range

1Amp Option

Current range over CT

10000A highest at primary side 9999A

Overload

10A/continue, 100A/1sec (None recurrence)

CT burden

<0.5VA

Measuring

True-RMS

Appendix

Appendix A Technical Data and Specification

Input ratings

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Parameters

Accuracy

Resolution

Voltage

0.5%

0.1%

Current

0.5%

0.02%

Power

1.0%

0.1%

Reactive Power

1.0%

0.1%

Apparent Power

1.0%

0.1%

Power Factor

1.0%

0.1%

Frequency

0.5%

0.01Hz

Energy

1.0%

0.1kWh

Reactive Energy

1.0%

0.1kvarh

Drift with temp.

< 100ppm/℃

Stability

0.1%0 /year

Relay output (RO)

Output form

Mechanical Contact

Contact Resistance

100m ohm@1A, Initial

Max break voltage

250Vac, 30Vdc

Max break current

5A

Max isolate voltage

4000Vac rms

Digital output (DO)

Output form

Photo-MOS, NO

Optical Isolation

4000Vac rms

Max Positive Voltage

40Vdc

Max Positive Current

30mA

Max Reverse Voltage

6Vdc

Accuracy

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Analog output (AO)

Output Range

4~20mA or 0~1mA or 0~5V

Resolution

12bit

Max Load
4~20mA

Max load resistance: 500Ω

0~1mA

Max load resistance: 10kΩ

0~5V

Max load current: 20mA

24Vdc power supply (PO)

Voltage Output range

24V(±10%)

Power Rating

2W

Isolate Voltage

1000Vdc

Standard

Measuring

IEC 61036 Class1

ANSI C12.16 Class10

Environmental

IEC 60068-2

Safety

IEC 61010

EMC

IEC 61000-4/2-3-4-5-6-8-11

Dimension

DIN 43700

24Vdc power supply (PO)

Dimension (mm)

96×96×60 (Cut OUT 92×92)

Protection

IP54 (Front), IP20 (Cover)

Weight (g)

500g

Temperature

-25℃~+70℃

Humidity

0~95% Non-condensing

Power Supply

85~264Vac or 100V~280Vdc

Power Consumption

2.5W

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Appendix

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Appendix B Ordering Information

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