Compressed Air Alliance POM100 User manual

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User Manual
Power Meter - No Display
Model: POM100

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POWER METER –POM100 USER MANUAL V1
Table of Contents
Notices ....................................................................................................................................................4
Electrical Safety............................................................................................................................................... 4
Installing the Power Meter and Maintenance Work..................................................................................... 4
Using the Power Meter ................................................................................................................................... 4
Disposing of the Power Meter........................................................................................................................ 4
Multi-Function Power Meter..................................................................................................................5
Why should you monitor power?................................................................................................................... 5
This power meter is best suited to ................................................................................................................ 5
Key Features .................................................................................................................................................... 5
Installation Requirements .............................................................................................................................. 5
Dimensions...................................................................................................................................................... 5
Specifications..........................................................................................................................................6
General Specifications .................................................................................................................................... 6
Displaying Data................................................................................................................................................ 8
Modbus RS485................................................................................................................................................. 8
Certificates....................................................................................................................................................... 9
Port Definition ............................................................................................................................................... 10
Wiring Diagrams ...................................................................................................................................11
Warranty and Help ...............................................................................................................................15
Warranty ........................................................................................................................................................ 15
Need help?..................................................................................................................................................... 15
Appendix –Communication Protocol..................................................................................................16
Modbus communications overview............................................................................................................. 16
Modbus communications settings............................................................................................................... 16
Command Request ....................................................................................................................................... 16
Functional code ............................................................................................................................................. 17
Function code (0x10=16) Operation ............................................................................................................ 19
Function code (0x03=3) Operation .............................................................................................................. 21

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POWER METER –POM100 USER MANUAL V1
Exception response....................................................................................................................................... 22
Command List ............................................................................................................................................... 23
Modbus Register List..................................................................................................................................... 26
Harmonics calculations................................................................................................................................. 36
Power, energy and power factor.................................................................................................................. 37
Energy delivered (imported) / energy received (exported)........................................................................ 37
Power factor (PF) ........................................................................................................................................... 37
True PF and displacement PF....................................................................................................................... 38
PF sign convention ........................................................................................................................................ 38
PF sign in IEC mode....................................................................................................................................... 38

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POWER METER –POM100 USER MANUAL V1
Notices
Please read this user manual in full and carefully
observe the notes and instructions before and
during installation, operation and maintenance.
The manufacturer cannot be held liable for any
damage which occurs as a result of non-
observance or noncompliance with this user
manual.
Should the device be tampered with in any
manner other than a procedure which is
described and specified in this manual, the
warranty is cancelled and the manufacturer is
exempt from liability.
The device is designed exclusively for the
described application.
This user manual should be read carefully by
the technician / qualified personnel and the end
user. This manual should be kept with the
power meter and made available to relevant
personnel. In case of any obscurities or
questions, regarding this manual or the product,
please contact Compressed Air Alliance.
Electrical Safety
Users should be suitably qualified, licensed and
experienced to use this product. Incorrect use
or installation could result in serious injury or
death. Compressed Air alliance is not liable for
any injury or incident occurring from using this
product.
Installing the Power Meter
and Maintenance Work
•The system must be disconnected from any
power supply during installation and
maintenance work.
•Any electrical work on the system is only
allowed by authorised qualified personal.
•The product should be maintained and
checked for faulty wiring on a regular basis.
•Do not use isopropyl alcohol to clean the
power meter.
Note: The power meter must be installed
properly and maintained. Incorrect installation
or maintenance may void the warranty and
result in:
•electric shock or electrocution
•damage to the power meter or other
equipment
•incorrect measurement values.
Using the Power Meter
•The power meter is not to be used in
explosive areas.
•Do not exceed or undercut the permitted
operating parameters.
•Do not exceed or undercut the permitted
storage parameters.
•See Specifications section for permitted
operating and storage parameters.
Note: any operation exceeding maximum or
minimum permitted parameters can lead to
malfunction and may lead to damage on the
power meter or the system. It may also void the
warranty.
Disposing of the Power Meter
Electronic devices are recyclable material and
do not belong in the household waste. The
power meter, accessories and its packing
material must be disposed according to your
local statutory requirements.

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POWER METER –POM100X00 USER MANUAL V1
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Multi-Function Power Meter
This multi-function three phase power meter
with Modbus/RTU output is simple to install and
easy to configure directly into a remote display
or into your data acquisition system.
The power meter can be installed on mains
supply and can be used for sub metering
individual equipment or sub loads.
Why should you monitor
power?
Monitoring power can help you:
•Reduce operating and energy costs
•Improve understanding of energy usage (eg
spikes, variation, usage)
•Identify phase and voltage issues
•Identify power factor and harmonic issues
•Compare and challenge your energy bill
•Improve efficiency and reduce waste
•Monitor your mains power supply usage and
quality
•Monitor individual equipment usage or sub
system loads
This power meter is best
suited to
•3 phase or single phase measurements
•Where no display is required
•Permanent installations
Key Features
•Measure voltage, amps, kilowatts, power
factor, kilowatt hours, kilovolt Amps (kVa)
and harmonics
•DIN rail mounting
•Modbus/RTU output
•Easy to install rogowski coil current
transducers
•Can be installed on mains supply
•Can be used for sub metering individual
equipment or sub loads
Installation Requirements
Installing power meters is not difficult but
should be done by suitably qualified and
experienced technicians. Some knowledge of
MODBUS communications is required to
connect the power meters to your network.
Dimensions
87 mm

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POWER METER –POM100X00 USER MANUAL V1
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Specifications
General Specifications
Power Meter Details
Type
Multi-function power meter
Applications
Power analysis
Energy meter
Mounting
Din Rail
Poles description
3PH4W 3PH3W
1PH2W (L-N) 1PH2W (L-L) 1PH3W (L-L-N)
Display
N/A (no display)
Available clamp sensors
Rogowski coil - 500A or 1,000A or 3,000A
Sampling rate
8,000 samples per second
Harmonic
52th Max
Dimensions
122 mm L x 87 mm W x 23 mm D
Weight
125 grams
Colour
White
Installation Type
Permanent installation or temporary installation
Contractual warranty
12 months
Measurement Ranges
Measured voltage
80V to 400V AC or 100V to 500V AC
Frequency
50/60Hz
Accuracy
Note: The accuracy of the
power meter is affected by the
quality of installation. On-site
conditions such as oil, high
humidity or other impurities
can also affect the accuracy of
the power meter
Current
0.5% from 1% to 120%
(manufacturer doesn’t ensure accuracy when
<10A)
Rated current
500A (0.5% from 10A to 600A)
3,000A (0.5% from 30A to 3600A)
10kA (0.5% from 100A to 12kA)
Rogwoski coil
specification
85mV/kA@50Hz±0.5%
Voltage
0.2% from 80V to 400V (or 100V to 500V)
Power factor
±0.005 from 10% to 120%
Active/Apparent Power
IEC62053-22 Class 0.5
Reactive power
IEC62053-21 Class 2
Frequency
0.01% from 45 to 65Hz

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POWER METER –POM100 USER MANUAL V1
Active energy
IEC62053-22 Class 0.5s
Reactive energy
IEC62053-21 Class 2
Power
Power supply
85 to 264VAC / 100 to 370VDC, 3.5W
Or 24VDC
Input
Input type
External CT (333mV only) or External Rogowski coil
Primary current range
Adjustable from 0.1A to 9999A
Measurement input range
1/225mV to 333mV
Permissible overload
600mV for 10s/hours
Output
Output parameters
Voltage, Amps and Kilowatts for each phase, power factor, reactive power
(kVa), total Kilowatts, Kilowatt hours and electrical system harmonics
Connection
Screw terminals 2.5mm2, interval 5.08mm
Relay
1 × digital output (2 ports) from 1pcs relay, rated 24V/800mA, 75mΩ
max
2.5kVrms insulation (controlled by Modbus)
Maximum Switching Power:
0.5A, 125VAC
1A, 30VDC
Optical coupler
Max voltage: 80VDC
Max current: 50mA
Recommend Current: 10mA
Environmental Conditions
Operating temperature
-25°C to +55°C
-13°F to +131°F
Storage temperature
-40℃to +85℃
-40°F to +185°F
Humidity rating
5% to 95% RH at 50℃ (non-condensing)
Pollution degree
2: Normally only nonconductive pollution occurs. Temporary conductivity
caused by condensation is to be expected.
Overvoltage category
III, for distribution systems up to 277/480VAC
Dielectric withstand
As per IEC61010-1, Doubled insulated front panel display
Altitude
3000m Max
IP degree of protection
IP20 conforming to IEC 60629
Alarm
Setting
Voltage and current, each phase, AVG
Output form
Relay

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POWER METER –POM100 USER MANUAL V1
Displaying Data
Instantaneous rms Values
Voltage
U, UTH2, UTH3, UTH4 (Per Phase, AVG)
Current
I, ITHD2, ITHD3, ITHD4 (Per Phase, AVG)
Power
P, Q, S, PF (Per Phase, SUM)
Energy
EP, EQ, ES, Freq (Per Phase, SUM)
Over 1 x 109kWh, value resets
UTHD (%)
UTHD, THD2, THD3, THD4 (Per Phase, AVG)
ITHD (%)
ITHD, THD2, THD3, THD4 (Per Phase, AVG)
PF
PFa, PFb, PFc, AVG
Update Rate
Data acquisition rate
400ms
Calibration
Current
Per phase, all
Voltage
Per phase, all
Power factor
Per phase, all
Energy
Reset to “0” EP, EQ, ES all phase
Modbus RS485
Communication
Transmission mode
RS485 port, Half duplex
RS485 link
3 wires
Communication protocol
MODBUS RTU
Settings
Communication address
1 to 247 (default 1)
Baud rate (communication
speed)
1200 to 57600 baud (default 19200)
Parity
Even, Odd, None (default)
Data Bit
8
Stop bit
1

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POWER METER –POM100 USER MANUAL V1
Certificates
EMC
Electrostatic discharge
Level IV (IEC61000-4-2)
Immunity to radiated fields
Level III (IEC61000-4-3)
Immunity to fast transients
Level IV (IEC61000-4-4)
Immunity to surge
Level IV (IEC61000-4-5)
Conducted immunity
Level III (IEC61000-4-6)
Immunity to power frequency
magnetic fields
0.5mT (IEC61000-4-8)
Conducted and radiated
emissions
Class B (EN55022)
Standard compliance
EN 62052-11, EN61557-12, EN 62053-21, EN 62053-22, EN 62053-23, EN 50470-1, EN 50470-3,
EN 61010-1, EN 61010-2, EN 61010-031

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POWER METER –POM100 USER MANUAL V1
Port Definition
Port Number
Port Name
Port Function
Remarks
1
IA+
A-phase current input positive
A-phase current
Current (I) Input
2
IA-
A-phase current input negative
3
IB+
B-phase current input positive
B-phase current
4
IB-
B-phase current input negative
5
IC+
C-phase current input positive
C-phase current
6
IC-
C-phase current input negative
7
N/A
Option
Option
8
N/A
Option
9
N/A
Option
10
UN
N-phase voltage input
Voltage (U) Input
11
UC
C-phase voltage input
12
UB
B-phase voltage input
13
UA
A-phase voltage input
14
N/A
Option
Option
15
N/A
Option
16
N/A
Option
17
N/A
Option
18
A
RS485 A (Data +)
RS485 communication
19
B
RS485 B (Data -)
20
GND
RS485 Ground (Shield)
21
OP+
Coupler output +
Coupler output
22
OP-
Coupler output -
23
RCOM
Relay output -
Relay output
24
RO1
Relay output +
25
V-
Power supply –(0V DC)
Power
85 to 265 V AC/DC or 24V DC
26
V+
Power supply + (24VDC)

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POWER METER –POM100 USER MANUAL V1
Wiring Diagrams
Before installing the power meter, make sure it is rated for your system (refer to Specification section).
WARNING:Incorrect wiring and installation can cause an electric shock, electrocution or
damage to the power meter or other equipment. It may also void the warranty.
Notes:
Rcoil*：Rogowski coil secondary output voltage can not be over 333mV rms.
CT^：CT must be voltage output, secondary output can not be over 333mV rms.
Circuit breaker: 500mA fuses and disconnect switch
VT primary fuses and disconnect switch
3PH4W no VT
B
C
N
A

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POWER METER –POM100 USER MANUAL V1
3PH3W no VT
3PH3W with VT
A
B
C
A
C
B

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POWER METER –POM100 USER MANUAL V1
1PH3W LL-N
1PH2W L-N
L
L
N
L
N

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POWER METER –POM100 USER MANUAL V1
1PH2W L-L
Modbus Communication Wiring Diagram
L
N
GRD
485A
485B

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POWER METER –POM100 USER MANUAL V1
Warranty and Help
Warranty
Compressed Air Alliance provides a 12-month
warranty for all Power Meters. The warranty
covers material and workmanship under the
stated operating conditions from the date of
delivery. Please report any findings immediately
and within the warranty time.
If faults occur during the warranty period
Compressed Air Alliance will repair or replace
the defective unit, without charge. The warranty
covers the device only, it does not cover other
services such as labour to remove or reinstall
the instrument, transport and packing. Warranty
repairs or replacements do not extend the
original period of warranty.
The following damage is excluded from this
warranty:
•Improper use and non-adherence to the
user manual.
•Use of unsuitable accessories.
•External influences (e.g. damage caused by
vibration, damage during transportation,
excess heat or moisture).
The warranty is cancelled when one of the
following situations occurs:
•The user opens the measurement
instrument without a direct request written
in this manual.
•Repairs or modifications are undertaken by
third parties or unauthorised persons.
•The serial number has been changed,
damaged or removed.
Other claims, especially damage occurring on
the outside of the instrument (eg dents, marks),
are not included unless responsibility is legally
binding.
Need help?
You can contact Compressed Air Alliance via:
•Phone (Australia): 1300 558 526
•E-mail: [e-mail]
•Website: www.compressedairalliance.com

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Appendix –Communication Protocol
Modbus communications overview
This power meter adopts standard protocol —Modbus-RTU. You can change the baud rate of
communication to 1200, 2400, 4800, 9600 etc. Error detection: CRC16 (cyclic redundancy check).
Modbus communications settings
Before communicating with the device using Modbus-RTU protocol, use the HMI to configure the
following settings:
Parameters
Available Values
Default Value
Baud rate
1200 Baud
2400 Baud
4800 Baud
9600 Baud
19200 Baud
38400 Baud
57600 Baud
19200 Baud
Data bits
8
8
Parity
Odd
Even
None
None
Stop bits
1
1
Address
1–247
1
Command Request
Slave Address
Function Code
Command Block
CRC
8-Bits
8-Bits
N×8-Bits
16-Bits Checking

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POWER METER –POM100 USER MANUAL V1
Functional code
Functional code tells what function addressed terminal equipment can execute. The following table lists
the functional code that used by this power meter, as well as their significance and function.
Function Code
Function Name
Behavior
Decimal
Hexadecimal
3
03H
Read Holding Registers
Read present HEX from one or more registers.
16
10H
Write Multiple Registers
Write present HEX on multiple registers.
Register table
Register tables have the following columns:
Register
Alias
Register
Address
Action
R/WC
Size
Type
Units
Description
Where
•Register Alias: The meaning of the register
•Register Address: Modbus address of register encoded in the Modbus frame, in decimal (dec)
•Action: The read/write by command register
•Size: The data size in Int16
•Type: The encoding data type
•Units: The unit of the register value
•Range: The permitted values for this variable, usually a subset of what the format allows
•Description: Provides information about the register and the values that apply
Unit Table
The following data types appear in the Modbus register list:
Type
Description
Range
UInt16
16-bit unsigned integer
0 to 65535
Int16
16-bit signed integer
-32768 to +32767
UInt32
32-bit unsigned integer
0 to 4 294 967 295
UInt64
64 bit unsigned integer
0 to 18 446 744 073 709 551 615
UTF8
8-bit field
multibyte character encoding for Unicode

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POWER METER –POM100 USER MANUAL V1
Type
Description
Range
Float32
32-bit value
Standard representation IEEE for floating number (with single
precision)
Bitmap
–
–
Date Time
–
-
Date Time Format
Units
Word
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1
Reserved (0)
Year (0–99,year from 2000)
2
Month (1–12)
Day (1–31)
3
Hour (0–23)
Minute (0–59)
4
Millisecond (0–59999)
Configure Meter
You can configure the power meter by writing command and command parameters to corresponding
command registers using Modbus function 16.
Command request
The following table describes a Modbus command request:
Slave
Address
Function
Code
Command
Register
Address
Command
Register
Number
Data
Length
Command
Register Value
CRC
1-247
16
300 (up to 423)
N
N x 2
Command Result
The command result can be obtained by reading registers 424 and 425.
The following table describes the command result:

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POWER METER –POM100 USER MANUAL V1
Register Address
Content
Size (Int16)
Data (example)
424
Requested Command Number
1
1001(set Date Time)
425
Result
1
0 = Valid Operation
80 = Invalid Command
81 = Invalid Parameter
82 = Invalid Number of Parameters
83 = Operation Not Performed
Command Request Example
Slave
Address
(8 bits)
Function
Code
(8 bits)
Command
Register
Address
(16 bits)
Command
Register
Number
(16 bits)
Data
Length
(8 bits)
N x 2
Command Register Value
(16 bits) X N
CRC
(16 bits)
High
8 bits
Low
8 bits
High
8 bits
Low
8 bits
Command
Parameter
High
8 bits
Low
8 bits
High
8 bits
Low
8 bits
High
8 bits
Low
8 bits
Function code (0x10=16) Operation
Function code (0x10=16) is used to configure the meter.
Request data format:
No.
Alias
Type
Range (decimal)
Description
1
Salve ID
UInt8
1-247
2
Function code
UInt8
16
3
Registers Start address
UInt16
-
Big-Endian (Sending order)
4
Registers Numbers
UInt16
1-123
Big-Endian (Sending order)
5
Bytes of Registers Values
UInt8
Registers Numbers x 2
6
Value of Register 1
UInt16
-
Big-Endian (Sending order)
7
…
UInt16
-
Big-Endian (Sending order)
8
Value of Register n
UInt16
-
Big-Endian (Sending order)
9
CRC-16 Check
UInt16
-
Little-Endian (Sending order)

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POWER METER –POM100 USER MANUAL V1
Response data format:
No.
Alias
Type
Range (decimal)
Description
1
Salve ID
UInt8
1-247
2
Function code
UInt8
16
3
Registers Start address
UInt16
300
Big-Endian
4
Registers Numbers
UInt16
1-123
Big-Endian
5
CRC-16 Check
UInt16
-
Little-Endian
Attention: Function code (0x10=16) can only write data to “Command Register，That is, only
registers starting from 300 can be written data.
For example: Configure “Digital Outputs” (command=1005)
No.
Alias
Type
Range
(decimal)
Range
(hexadecimal)
Description
1
Salve ID
UInt8
1
01
2
Function code
UInt8
16
10
3
Registers Start address
UInt16
300
012C
Big-Endian (Sending order)
4
Registers Numbers
UInt16
2
0002
Big-Endian (Sending order)
5
Bytes of Registers Values
UInt8
4
04
6
Value of Register 300
UInt16
1005
03ED
Big-Endian (Sending order)
7
Value of Register 301
UInt16
1
0001
Big-Endian (Sending order)
9
CRC-16 Check
UInt16
50093
C3AD
Little-Endian (Sending order)
Request data send as follows: 01 10 01 2C 00 02 04 03 ED 00 01 AD C3
If the configured data is right, the meter will response data as follows: 01 10 01 2C 00 02 81 FD
No.
Alias
Type
Range
(hexadecimal)
Range
(decimal)
1
Salve ID
UInt8
01
1
2
Function code
UInt8
10
16
3
Registers Start address
UInt16
012C
300
4
Registers Numbers
UInt16
0002
2
7
CRC-16 Check
UInt16
81FD