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

5
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

6
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

7
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

8
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

9
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

10
Fig.2.3.1.1 The connect method should be setted as 3 phase 4 wire
Fig.2.3.1.2&2.3.1.3 should be 3 phase 3 wire
2.3.2 Communication wiring
Communication wiring,and the impedance value that matching the resistance is 120Ω,as
fig.2.3.2.1 Communication loop wiring as fig.2.3.2.2
Fig.2.3.1.2 3 phase 3 wire 2PT-3CT wiring
Fig.2.3.1.3 3 phase 3 wire 2PT-2CT voltage wiring
Notice
1.The input voltage should not exceed the nominal input voltage.Otherwise must use
PT.Short circuit is forbidden for the PT to avoid the high current.1A fuse is must in
the voltage input end
2. If there are other meters on the CT,pls use the combination method.Pls first
disconnect the CT primary loop or short circuit the secondary circuit before remove
the current input of meter.CT is forbidden to open circuit to avoid high voltage.
3.It's better to use the wire connect bank but not to connect the CT directly for easy
dismounting
4.Make sure the voltage and current is same phase and same direction

11
1:RS485/RS232 converter
2:Matched resistance
3:Computer communication port
4:Single point grounding
1:RS485/RS232 converter
2:Computer communication port
3:Single point grounding
2.3.3 DI wiring
Monitoring the switch value and digital value of two branch nodes.Opto-isolated input.The
isolated voltage is 1500VAC.Isolated 24VDC output from the inner supply input loop power
for the branch nodes. The wiring diagram as below:
Fig.2.3.2.1 Straight-line wiring method
Fig.2.3.2.2 Loop wiring method

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3.Operation guidance
3.1 Illustration of the screen display
Introduction:
1.Current parameter:
U:voltage
I:current
F:frequency and power factor
P/Q/S: power
2.Max.& Min. value
3.Three phase unbalance factor
4.Load:
Capacitance load(upper)
Inductive load(below)
5.Electrical degree:
Lmp:depleting
Exp:issue
Total:total
6.Time
Fig.2.3.3 DI input
Notice
1.The conductor cross section of the connection wire to the device
should meet the following requirements: the cross section of current
wires is less than 2.5mm2 ,the cross section of voltage wires is less
than 1.0mm2
2.In order to reduce the impact of current at startup, it is
recommended for each power wire connects not more than 40
devices.
3.The communication wire must adopt the shielded twisted pair line.
The PS485+,RS485-of the communication wire should be connected
correctly.
4.When straight-line wiring method is used,100~120Ωmatching
resistance should be connected between RS485+and RS485-
terminals.
5.When the baud rate is 9600bps,the length of the
communication wires should be less than 1200m.
3

13
7.DI condition
8.DO condition
9.Units:
Current:A KA
Voltage:V KV
Power factor:PF
Frequency:Hz
Active power:KWA
Apparent power:KVA
Active electric energy:KWh
Reactive electric energy:Kvarh
Three phase unbalance degree:%
10.Current load rate
11.Communication condition
3.2 Buttons:
Introduction: There are total four buttons,F1,F2,F3,F4
It's different functions under the different work mode. Short press and long press is also
different.
Short press: press and loosen in 1s
Long press: press last more than 1s
3.2.1 Button function list
Work mode
-
F1
F2
F3
F4
Measure
mode
Short press
Zone 1 switch
Zone 2 switch
Zone 3 switch
Energy switch
Long press
Esc
Setup mode
Short press
+
-
Shifting
Long press
Esc
Enter
Work mode
-
F1+F2
F1+F3
Measure
mode
Short press
Zone 5 switch
Zone 6 switch
Long press
Setup mode
Short press
+
Long press
3.2.2 Zone display list
Zone
Display
1
Voltage/current load rate, current unbalance degree, phase voltage, wire voltage,
voltage unbalance degree
2
Total phase power factor& frequency, per-phase power factor,
3
Per-phase active power, per-phase reactive power, per-phase apparent power, total
Fig.3.1 Screen display

14
active power, total reactive power, total apparent power
4
Active energy absolute, Reactive energy absolute, Total active energy+, Total active
energy-, Phase 1 reactive, Phase 2 reactive Phase 3 reactive Phase 4 reactive Tip period
energy, Peak period energy, Flat period energy, Date, Time
5
the current month active max. demand+/-,the current month reactive max. demand,
the last month active max. demand+/-,the last month reactive max. demand, max.
per-phase phase voltage value, min. per-phase phase voltage value, max. per-phase
wire voltage value, min. per-phase wire voltage value, max. per-phase current value,
min. per-phase current value,max. frequency& power factor value, min. frequency&
power factor value, max. per-phase power factor value, min. per-phase power factor
value, max. active energy value, min. per-phase active energy value, max. reactive
energy value, min. per-phase reactive energy value, max. reactive energy value, min.
per-phase reactive energy value, max. three phase power value,min. three phase power
value.
6
SOE evens query
3.3 Measure mode
After power on, the meter enter the measure mode. Under this mode, we could check all the
measurement parameters.
3.3.1 Zone 1 display:
Total 5 pages and display:
Current and current load rate, current unbalanced degree, phase voltage, wire voltage,
voltage unbalanced degree. Short press F1 to select different pages.*Pls notice, when 3
Phase 3 Wire, it can't display the voltage page, the wire voltage can't display the Uca.
Load rate indication:
Secondary current percentage rate of the CT2 setting value, from 0%~120%
When segregated current display, the load rate of all phase display. The function as below.
If over the CT2 setting value,the alarm mark will display.
Fig.3.3.1.1 Segregated current Current unbalanced degree Segregated phase voltage Segregated wire voltage Voltage unbalanced degree

15
Fig.3.3.3 Zone 3
Active energy absolute
Reactive energy absolute
Total active energy+
Total active energy-
Phase 1 reactive
Total reactive energy+
Total reactive energy-
Phase 2 reactive
Phase 3 reactive
Phase 4 reactive
Phase 4 reactive
Tip period energy
Peak period energy
Normal period energy
Date
Time
3.3.2 Zone 2 display:
Total phase power factor & frequency, per-phase power factor.
Short press F2 to check all the pages.
*Pls notice when 3 Phase 3 Wire, it can’t display per-phase power factor.
3.3.4 Zone 3 display
Total 4 pages to display:the per-phase active power, per-phase reactive power, per-phase
apparent power, total active power, total reactive power, total apparent power.
Short press F3 to check all the pages.
*Pls notice when 3 Phase 3 Wire, it can only display total active power, total reactive power,
total apparent power. Reference fig.3.3.3
3.3.4 Zone 4 display
Short press F4 to check the pages.
As fig.3.3.4
Freeze electrical degree don't
effect the real-time display.
The degree collected by the
Modbus is not updated but
will be real-time data after
unfreeze.
3.3.5 Zone 5 display
This page displays:
Fig.3.3.1.2 Load rate display
split-phase active
power
split-phase
reactive power
split-phase
apparent power
Total
active/reactive/appar
ent power
Fig.3.3.1.3 Total phase power factor per-phase power factor

16
Fig.3.3.4 Zone 4
Fig.3.3.5.1 Zone 5 demand display
the current month active max. demand+/-,
the current month reactive max. demand,
the last month active max. demand+/-
the last month reactive max. demand, max. per-phase phase voltage value, min. per-phase
phase voltage value,
max. per-phase wire voltage value,
min. per-phase wire voltage value,
max. per-phase current value,
min. per-phase current value,
max. frequency& power factor value,
min. frequency& power factor value,
max. per-phase power factor value,
min. per-phase power factor value,
max. active energy value,
min. per-phase active energy value,
max. reactive energy value,
min. per-phase reactive energy value,
max. reactive energy value,
min. per-phase reactive energy value,
max. three phase power value,min. three phase power value.
Example:
Demand display
Min.&max value display
P:active demand
Q:reactive demand
1. the current month
2. the last month
Demand mark
Forward
Reverse
Time
U:voltage I:current
F:frequency P:active
Q:reactive S:apparent
U:voltage I:current
F:frequency P:active
Q:reactive S:apparent
Max.: the maximum value
Min.: the minimum value
Date&time

17
Fig.3.3.5.2 Zone 5 min.&max. value display
Fig.3.3.5.2 Zone 6 Zone 6
Operation：
Short press F1+F2 to enter zone 5.Long press F1 or short press F1+F2 to exit.
Short press F1 to modify the selected parameter. The time is the occurrence time when
max./min. value occurred. Time and date cyclic display.
3.3.6 Zone 6 display
This zone is for events query.Refer below pic.3.3.6
Total record: this power meter support 64 pcs SOE events record. Digital value and off-limit
alarm SOE is public.
Current serial number: show the current SOE record number. It’s sorted according the SOE
occur time
Events type: 0: digital value 1:off-limit alarm
Events code: events codes instead the SOE record events, details as below list.3.3.6
Events state: 0: DI turn from close to break. 1: DI turns to close from break.The off-limit
alarm SOE is default as 0
Date and time: show the time when SOE occur. Cyclic display
NO.
Explain
NO.
Explain
0
DI1
15
A phase low power factor
1
DI2
18
B phase current off-limit alarm
2
DI3
19
B phase /BC line voltage overvoltage
3
DI4
20
B phase/BC line voltage overvoltage
10
A phase current off-limit alarm
23
B phase low power factor
11
A phase /AB line voltage overvoltage
26
C phase current off-limit alarm
12
A phase /AB line voltage low voltage
27
C phase /CA line voltage overvoltage
13
A phase over frequency
28
C phase /CA line voltage low voltage
14
A phase low frequency
31
C phase low power factor
Operation：
Short press F1+F3 to enter Zone 6. Long press F1 to short press F1+F3 to exit. If no SOE record, It will
display NO SOE and exit SOE interface automatically.
Short press F2 to enter the next page.
Total record
Current serial number
Deflection state
H
M
S
M
Event
code

18
Fig.3.3.7.1 Data receiving
Fig.3.3.7.2 Data transferring
Fig.3.3.8 Digital value condition
Short press F3 to back to the previous page
3.3.7 Communication mark
When the power meter receive the data from master computer, below mark will icon will appear.
3.3.8 Digital value display
The digital value will displayed in the screen, refer fig.3.3.8 (DI3,DI4 is unused)
3.4 Setting mode
Long press F4 to enter the setting mode.
First enter the password. Default is 0000,then short press F2(+function) &F3(-function) to
choose the item. Long press F4 to enter the sub-menu and choose the details entry or enter
the value.
Long press F4 to enter, long press F1 to exit and auto go back.
When enter the details value, short press F4 to move to the positions that need to modify.
When it's shine, short press F2(+function) or F3(-function)to modify the value. Long press F4
to enter, and will display 'save' for select whether save or not. Long press F4 to save or long
press F1 to exit.
If the enter value is out the fixed range, 'ERRN' error information will display and ask to enter
again.
3.4.1 Data storage:
After modify the parameter, we could operate as below to save. Refer fig.3.4.1
In the pic., we modify the connection mode to the 3 Phase 4 Wire and save.
Steps:
After modify, long time press F4,it will show ‘Save or not’, long press F4,screen will
display 'Yes' and this will mean save successfully. Or long time press F1 to exit and back
to previous menu.

19
Samples:
Modify CT1,CT2,PT1,PT2
Set voltage rated primary PT1 value as 35KV, rated secondary PT2 value as 100V.
PT1 rated value = set value x10
Set voltage rated primary PT1 value as 35KV, modify the rated value as 3500 as below
reference fig.3.4.2
Set voltage rated secondary PT2 value as 100V,refer fig.3.4.3
CT1,CT2 set steps similar as PT2
Fig.3.4.1 Parameter save

Fig.3.4.2 PT1 setting samples
Fig.3.4.3 PT2 setting samples