GREWIN EPM300A-1BY User manual

TIANJIN GREWIN TECHNOLOGY CO.,LTD.
EPM300A-1BY
Multiple function power meter
User Guide
©Tianjin Grewin Technology Co.,Ltd.We reserve all right in this document and in the information contained
within. Reproduction,use or disclosure to third partners without express authorization is strictly forbidden.
Tianjin Grewin Technology Co.Ltd
Web:www.grewin-tech.com .
Add:DongLi Distr Tianjin City, China
Phone: [phone]
WhatsApp:[phone]
Email:salesma[email protected]

1
Attention
User should read this manual carefully before preparing to install, operate, serve or maintain. Below
special words will across all the manual, or will stick onto the instructions to remind the potentially
dangerous or to mark the important points.
‘ DANGER’ SHOWS AN DIRECT DANGER.IF CAN’T BE AVOIDED,IT WILL LEAD TO IMMEDIATE
DEATH OR BAD INJURED!
‘ WARNING’SHOWS A POTENTIALLY DANGER.IF CAN’T BE AVOIDED,IT COULD LEAD TO
DEATH OR BAD INJURED!
' NOTICE' SHOWS A POTENTIALLY DANGER.IF CAN’T BE AVOID,IT COULD LEAD TO SMALL
OR MODERATE INJURED!
‘NOTICE’SHOWS A POTENTIALLY DANGER.IF CAN’T BE AVOID,IT COULD LEAD TO DIRECT
PROPERTY DAMAGE
Declaration
Electrical equipment should be installed, operated, used and maintained by professional staffs. This
manual is not guidance to the staffs without professional training. This company will be not liable to any
adverse consequence caused by violating the rules.
This company reserve right of content amending without notify again. All the products and service
warranty are in the attached guarantee list.
This company is not liable to the technical error or the textual error and textual error in this manual.
Unless the copy right authorization , this manual is strictly prohibited to be copied, quoted and translated
without written approval.
DANGE
WARNIN
NOTICE
NOTICE

2
Safety Instruction
This part includes the safety instructions which should be complied before installing, serving and
maintaining the equipment.
WARNING!
Danger Of Electric Shock,Fire And Exploding.
Only profession staffs could install this equipment after complete read the manual.
Don’t work alone.
Power dump before equipment testing and maintaining.
Supposing the circuit is live before making sure it’s fully discharged
Pay special attention to the power source.Considering all the source, including the possibility of
inversely feeding.
Cut off the power when work on or in the equipment.
Use the right tester to make sure the power is fully cut off.
Be careful of the potential danger. Do personal protective and check whether other tools or things
leave over.
Don’t touch the live busbar.
Right and safe operation make equipment running well and to avoid the damage.
Cut off all the connecting in-out lines with the equipments when insulation testing to avoid the
damage to the instrument.
If don't execute above instructions could lead body injured and death.

3
Catalogue
1. INTRODUCTION ········································································ 4
1.1 Introduction ··········································································· 4
1.2 Function ·············································································· 4
1.3 Specification ········································································ 6
1.4 EMC Standard ········································································ 7
2. INSTALLATION ········································································ 8
2.1 Installation ············································································ 8
2.2 Terminal ············································································· 9
2.3 Terminal wiring ······································································· 10
3. OPERATION GUIDANCE ······························································· 14
3.1 illustration of the screen display ······················································· 14
3.2 Buttons ·············································································· 14
3.3 Measure mode ········································································ 15
3.4 Setting mode ········································································ 20
4. COMMUNICATION ····································································· 24
4.1 MODBUS protocol ···································································· 24
4.2 Communication protocol address table and introduction ································ 24
5. SELF-CHECING ········································································ 41

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1.Introduction
1.1Introduction
EPM300A-1BY is intelligent multi-purpose power meter which integrates the remote
measuring, and remote communication functions.
This meter could test, display and Remote Transfer all the common power parameters,4-ch
digital inputs,2-ch relay output, multi tariff statistics, SOE record, Off-limit Alarm, over-limit
alarming ,max.& min. value statistics. And communicate with the computer to be a
intelligent monitoring system.
1.2Functions
1.2.1 Basic function
1.2.1.1 Display & measure
Voltage
Current
Voltage unbalance degree
Current unbalance degree
Current load degree
Active power, reactive power and apparent power
Power factor
Frequency
Total active energy absolute ,total reactive energy absolute
Input active energy absolute, input reactive energy absolute
Output active energy absolute, output reactive energy absolute
4 quadrants reactive energy
1.2.1.2 Load type:
Indicate the current load type:
Capacitive load or Inductive load
1.2.1.4 Remote transfer:
2DI real time switch-status monitoring, electric level and impulse output setting
1.2.1.5 Remote signaling:
2 channel DI real time switch-status monitoring
1.2.1.6 Off-limit alarm style
Support over current, low voltage, over voltage, low frequency, over frequency,
low power factor off-limit alarm
1.2.1.7 Remote communications
Communication interface:RS485
ModBUS-RTU protocol
1.2.1.8 SEO record: max. 64 alarms and DI events

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1.2.1.9 Demand record: record the max. Demand of total active power(+/-), demand
and occurrence time of the max. Demand of total reactive power(+/-) of this month and
the last month.
1.2.1.10 The mix./min. Value of the current,voltage,frequency,power factor,
active/reactive/apparent power and the occurrence time of the max./min. value.
1.2.1.11 Multi-tariff: max. 8 schedules and 4 tariffs
1.2.1.12 Display: real time parameter, DI status, communication status.
1.2.1.13 Factors setting and register when power off suddenly
1.2.2 function description
1.2.2.1 Off-limit alarm
Support over current, under voltage, over voltage, under frequency, over frequency,
under power factor off-limit alarm and SOE
When the parameter is beyond limit, the alarm time is over the TK, and will trigger with
position alarm and record the SOE. Otherwise, alarm will disappear. Reference fig.1
1.2.2.2 Demand statistic
Record the max. Demand of total active power (+/-), demand and occurrence time of the
max. Demand of total reactive power( +/-)and the occurrence time.
Adopt sliding window mode, interval is 15 min. The demand value is the average value of
the 15 times sampling value in the last calculated period. Display data update one time for
every minute. Save the max. value of month in the MAX DEMAND UNIT of last Month when
the end of every month and at the same time, this max. value will be cleared.
Fig. 1 Off-limit work principle

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1.3 Specification
ITEMS
NOTES
Input
Test
Display
Web
3P3L,3P4L Configuration
Voltage
Rated value
AC400V or AC100V Optional
Overload
Measurement:1.2 times, Instantaneous 2 times/10s
Consumption
<1VA per phase
Impedance
>400kΩ
Precision
RMS measurement Precision ±0.2%
Current
Rated value
AC5A or AC1A
Overload
Continued 1.2 times Instantaneous 10 times/10s
Consumption
<0.4VA per phase
Impedance
<20mΩ
Precision
RMS measurement Precision ±0.2%
Frequency
40~60Hz Precision ±0.02Hz
Power
Active power, reactive power, apparent power Precision ±0.5%
Energy
Total active energy absolute .Total reactive energy absolute
Input active energy absolute. Input reactive energy absolute
Output active energy absolute
Output reactive energy absolute
4 quadrants reactive energy
Precision active-energy ±0.5%,reactive-energy ±1%
Display
LCD display
Modbus communication to change the display interface
Digital input
Input
2-ch input, opto-isolator, passive idle contact input(2DI,optional
functions)
Isolation Voltage
2500Vrms
SOE
Resolution
1ms
Record numbers
Max.64
Comm.
Interface
RS485
Protocol
ModBUS-RTU
Baud rate
2400/4800/9600/19200bps
Data format
Odd parity check, even parity check, none parity check
Working
power
Working voltage
AC:85V～265V or DC:100V～360V
Power consumption
≤2VA
Work
environment
Work temperature
-20℃～55℃
Storage temperature
-40℃～85℃
Humidity
0～95％non-condensate
Safe
Insulating strength
Between input/output/hull/power supply: 2kV Acrms，1 min.
Dimension
weight
Size
96mm×96mm×71 mm
Weight
0.4kg

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1.4.EMC Standard
TEST ITEMS
LEVEL
STANDARD
high frequency anti-jamming test
Ⅲ，Ⅳ
GB/T 15153.1/1998
electrostatic discharge anti-jamming test
Ⅲ
GB/T 15153.1/1998
electrical fast transient anti-jamming test
Ⅳ
GB/T 17626.4-2008
surge anti-jamming test
Ⅳ
GB/T 15153.1/1998
power frequency magnetic fields anti-jamming test
Ⅳ，Ⅴ）
GB/T 17626.8-2006
2.Installation
2.1 Installation
2.1.1 Dimension
Meter dimension size:96*96*71mm
Panel size:96*96mm
Slot size:90.5 -0.0+0.5 mm ×90.5 -0.0+0.5 mm
Min. depth is 80mm
2.1.2 Installation steps:
Slots on the switchgear should be 90.5 -0.0+0.5 mm ×90.5 -0.0+0.5 mm
Take down the fixed mount of the meter
Put the meter into the slots and insert the fixed mount
2.2 Terminal wiring
2.2.1 Terminal definition
Fig.1 Installation schematic diagram
Notice
Avoid close to the system with electromagnetic interference

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Terminal definition LIST
VOLTAGE INPUT
1
UA
CURRENT INPUT
13
I11
2
UB
14
I12
3
UC
15
I21
4
UN
16
I22
POWER SUPPLY
5
L/+
17
I31
6
N/-
18
I32
7
PE
19
I41
8
NC
20
I42
9
NC
COMMUNICATION
32
A+
REMOTE
SIGNALING
10
DI1
33
B-
11
DI2
34
SHLD
12
COM
2.3 Terminal wiring
2.3.1 Voltage and current input wiring
Introduction:
UA :A phase voltage input
UB :B phase voltage input
UC :C phase voltage input
UN :N phase voltage input
Fig.2 Terminal definition

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L/+ :Power supply+
N/- :Power supply -
DI1 :Digital input 1
DI2 :Digital input 2
COM :Digital input common point
I11 :A phase current input
I12 :A phase current output
I21 :B phase current input
I22 :B phase current output
I31 :C phase current input
I32 :C phase current output
NC :No wiring
Rs485+
Rs485-
Fig.2.3.1.1 3 phase 4 wire 3PT-3CT wiring