CET PMC-512-A User manual

PMC-512-A
AC Multi-Circuit Power Monitor
User Manual
Version: V1.1
July 4, 2018

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This manual may not be reproduced in whole or in part by any means without the express
written permission from CET.
The information contained in this manual is believed to be accurate at the time of publication;
however, CET assumes no responsibility for any errors which may appear here and reserves
the right to make changes without notice. Please consult CET or your local representative
for the latest product specifications.
DANGER
This symbol indicates the presence of danger that may result in severe injury or death and
permanent equipment damage if proper precautions are not taken during the installation,
operation or maintenance of the device.
CAUTION
This symbol indicates the potential of personal injury or equipment damage if proper
precautions are not taken during the installation, operation or maintenance of the device.

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DANGER
Failure to observe the following instructions may result in severe injury or
death and/or equipment damage.

Installation, operation and maintenance of the meter should only be
performed by qualified, competent personnel that have the appropriate
training and experience with high voltage and current devices. The meter
must be installed in accordance with all local and national electrical codes.

Ensure that all incoming AC power and other power sources are turned OFF
before performing any work on the meter.

Before connecting the meter to the power source, check the label on top of
the meter to ensure that it is equipped with the appropriate power supply, and
the correct voltage and current input specifications for your application.

During normal operation of the meter, hazardous voltages are present on its
terminal strips and throughout the connected potential transformers (PT) and
current transformers (CT). PT and CT secondary circuits are capable of
generating lethal voltages and currents with their primary circuits energized.
Follow standard safety precautions while performing any installation or service
work (i.e. removing PT fuses, shorting CT secondaries…etc).

Do not use the meter for primary protection functions where failure of the
device can cause fire, injury or death. The meter should only be used for
shadow protection if needed.

Under no circumstances should the meter be connected to a power source if
it is damaged.

To prevent potential fire or shock hazard, do not expose the meter to rain or
moisture.

Setup procedures must be performed only by qualified personnel familiar with
the instrument and its associated electrical equipment.
DO NOT open the instrument under any circumstances.

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Limited warranty

CET offers the customer a minimum of 12-month functional warranty on the meter
for faulty parts or workmanship from the date of dispatch from the distributor.
This warranty is on a return to factory for repair basis.

CET does not accept liability for any damage caused by meter malfunctions. CET
accepts no responsibility for the suitability of the meter to the application for
which it was purchased.

Failure to install, set up or operate the meter according to the instructions herein
will void the warranty.

Only CET’s duly authorized representative may open your meter. The unit should
only be opened in a fully anti-static environment. Failure to do so may damage
the electronic components and will void the warranty.

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Table of Contents
Glossary .................................................................................................................................................... 7
Chapter 1 Introduction ............................................................................................................................. 8
1.1 Overview ....................................................................................................................................8
1.2 Features......................................................................................................................................8
1.3 PMC-512-A’ application in Monitoring Management Systems ................................................10
1.4 Getting more information ........................................................................................................10
Chapter 2 Installation ............................................................................................................................. 11
2.1 Appearance ..............................................................................................................................11
2.2 Unit Dimensions .......................................................................................................................12
2.2.1 Main Unit ......................................................................................................................12
2.2.1 HMI ...............................................................................................................................12
2.3 Overall Setup ............................................................................................................................13
2.4 Mounting..................................................................................................................................13
2.4.1 Mounting PMC-512-A ...................................................................................................13
2.4.2 Branch CTs and other Accessories.................................................................................14
2.4.3 Mounting the HMI ........................................................................................................17
2.5 Wiring Connections ..................................................................................................................18
2.5.1 Wiring Modes................................................................................................................18
2.5.2 Typical Application Wiring.............................................................................................20
2.5.3 CT Wiring.......................................................................................................................20
2.5.4 Communications Wiring................................................................................................22
2.5.5 Digital Input Wiring .......................................................................................................22
2.5.6 Analog Input Wiring ......................................................................................................22
2.5.7 Digital Output Wiring ....................................................................................................23
2.5.8 PMC-512-A Power Supply Wiring..................................................................................23
2.5.9 HMI Power Supply Wiring .............................................................................................23
Chapter 3 Front Panel............................................................................................................................. 24
3.1 Front Panel LED Indicators........................................................................................................24
3.2 Using the Front Panel Buttons..................................................................................................24
3.3 Data Display..............................................................................................................................25
3.3.1 Auto-Scroll ....................................................................................................................25
3.3.2 Metering .......................................................................................................................26
3.3.3 Alarm Status..................................................................................................................26
3.3.4 DI/DO Status .................................................................................................................26
3.3.5 SOE Log .........................................................................................................................26
3.3.6 Information ...................................................................................................................27
3.4 Setup and Maintenance via the Front Panel ............................................................................27
3.4.1 Making Setup Changes..................................................................................................27
3.4.2 Setup Menu ..................................................................................................................28
3.4.3 Configuration ................................................................................................................29
3.4.4 Maintenance .................................................................................................................31
Chapter 4 Applications ...........................................................................................................................33

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4.1 Inputs and Outputs ..................................................................................................................33
4.1.1 Digital Inputs .................................................................................................................33
4.1.2 Analog Input..................................................................................................................33
4.1.3 Energy Pulse Outputs....................................................................................................33
4.2 Power, Energy and Demand .....................................................................................................34
4.2.1 Basic Measurements.....................................................................................................34
4.2.2 Energy Measurements ..................................................................................................34
4.2.3 Interval Energy Measurements .....................................................................................34
4.2.4 Demands .......................................................................................................................35
4.3 Alarm Setpoints........................................................................................................................35
4.3.1 Alarm Status..................................................................................................................35
4.3.2 Universal Hysteresis and Current ON/OFF Status .........................................................36
4.3.3 Current Alarms..............................................................................................................37
4.3.4 Voltage Alarm................................................................................................................38
4.3.5 Frequency Alarm...........................................................................................................39
4.3.6 Unbalance Alarm ..........................................................................................................40
4.3.7 Phase Reversal Alarm....................................................................................................41
4.3.8 Phase Loss Alarm ..........................................................................................................41
4.3.9 AI Alarm ........................................................................................................................42
4.3.10 DI Alarm ......................................................................................................................43
4.4 Power Quality...........................................................................................................................43
4.4.1 Phase Angles .................................................................................................................43
4.4.2 Unbalance .....................................................................................................................43
4.4.3 Harmonics .....................................................................................................................44
4.5 Sub-Meters (SM) ......................................................................................................................44
4.6 Virtual Meters (VM) .................................................................................................................45
4.7 Data Logging.............................................................................................................................45
4.7.1 Peak Demand Log .........................................................................................................45
4.7.2 SOE Log .........................................................................................................................46
4.7.3 Daily Freeze Log ............................................................................................................46
4.7.4 Monthly Freeze Log.......................................................................................................46
4.7.5 Data Recorder Log (DR Log) ..........................................................................................46
Chapter 5 Modbus Register Map............................................................................................................48
5.1 Status Register..........................................................................................................................48
5.1.1 General Status...............................................................................................................48
5.1.2 Instantaneous Alarms ...................................................................................................49
5.1.3 Latched Alarms .............................................................................................................50
5.2 Basic Measurements ................................................................................................................51
5.2.1 Measurements..............................................................................................................51
5.2.2 Measurements for HMI.................................................................................................53
5.2.3 Operating Time .............................................................................................................54
5.3 Energy Measurements .............................................................................................................54
5.3.1 Complete Energy Measurements based on kWh, kvarh and kVAh...............................54
5.3.2 Complete Energy Measurements based on SMs and VMs ...........................................55

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5.3.3 kWh and kvarh Energy Measurements for SMs and VMs.............................................56
5.3.4 Interval Energy Measurements .....................................................................................56
5.4 DI Pulse Counter.......................................................................................................................57
5.5 Demands ..................................................................................................................................57
5.5.1 Present Demands..........................................................................................................57
5.5.2 Peak Demand Log of This Month (Since Last Reset) .....................................................58
5.5.3 Peak Demand Log of Last Month (Before Last Reset) ...................................................59
5.6 Harmonics Measurements .......................................................................................................60
5.6.1 Voltage THD Measurements .........................................................................................60
5.6.2 Current THD Measurements .........................................................................................61
5.6.3 Individual Harmonics ....................................................................................................61
5.7 Log Register ..............................................................................................................................62
5.7.1 SOE Log .........................................................................................................................62
5.7.2 Daily Freeze Log ............................................................................................................62
5.7.3 Monthly Freeze Log.......................................................................................................64
5.7.4 Data Recorder Log.........................................................................................................65
5.8 Device Setup.............................................................................................................................65
5.8.1 Basic Setup Parameters.................................................................................................65
5.8.2 AI Setup.........................................................................................................................66
5.8.3 DI Setup.........................................................................................................................66
5.8.4 Communication Setup Parameters ...............................................................................66
5.8.5 Alarm Setup ..................................................................................................................67
5.8.6 1-Ø SMs Setup Parameters ...........................................................................................69
5.8.7 VM Setup ......................................................................................................................70
5.8.8 Data Recorder Setup .....................................................................................................70
5.9 Time Registers ..........................................................................................................................70
5.10 Clear/Reset Control ................................................................................................................71
5.11 Remote Control ......................................................................................................................71
5.12 Meter Information..................................................................................................................72
Appendix A - SOE Event Classification .................................................................................................... 74
Appendix B - Data Recorder Parameters ................................................................................................76
Appendix C - Data Recorder Default Settings .........................................................................................79
Appendix D - Mains Circuit CT ................................................................................................................81
Appendix E - Technical Specifications..................................................................................................... 85
Appendix F - Accuracy Specifications .....................................................................................................86
Appendix G - Standards Compliance ...................................................................................................... 87
Appendix H - Ordering Guide .................................................................................................................88
Contact us............................................................................................................................................... 89

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Glossary
CET = Cet Electric Technology
1-Ø = Single Phase
3-Ø = Three Phase
SM = Sub Meter
VM = Virtual Meter
LCD = Liquid Crystal Display
DMD = Present Demand
PQ = Power Quality
Fund. = Fundamental
THD = Total Harmonic Distortion
TOHD = Total Odd Harmonic Distortion
TEHD = Total Even Harmonic Distortion
Hn = nth order Harmonic, integer multiple (n) of the Fundamental Frequency (50Hz or 60Hz)
HDn = nth order Harmonic Distortion
DR = Data Recorder
SOE = Sequence Of Events
DI = Digital Input
DO = Digital Output
SSR = Solid State Relay
FIFO = First In First Out
MB = Mega Byte
RTC = Real Time Clock
Ung = Neutral to Ground Voltage
U1/2/3 = 3-phase Line to Neutral Voltage
U12/23/31 = 3-phase Line to Line Voltage
I1/2/3 = 3-phase Current

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Chapter 1 Introduction
This manual explains how to use the PMC-512-A AC Multi-Circuit Power Monitor.
This chapter provides an overview of the PMC-512-A and summarizes many of its key features.
1.1 Overview
The PMC-512-A is CET’s latest offer for the economical multi-circuit monitoring of Data Centers, Telecom
Base Stations and Industrial & Commercial Buildings. Housed in a compact DIN Rail Mountable
enclosure, the PMC-512-A is perfectly suited for high-density metering applications. The PMC-512-A
features quality construction with multifunction and high-accuracy measurements with an optional
color touch-screen HMI that supports up to 16 devices simultaneously over a RS-485 network. The PMC-
512-A comes standard with 12xDIs for status monitoring or pulse counting, 1xDO for control or alarming
as well as 1xAI for temperature measurement or other analogue input applications. The standard SOE
Log records all setup changes, alarms and DI/DO operations in 1ms resolution. With dual RS-485 as
standard feature supporting Modbus RTU, the PMC-512-A can easily be deployed in a stand-alone
system with its Touch Screen HMI or simultaneously with a centralized monitoring and control system
for an AC power distribution network.
Typical Applications
Power/Energy Monitoring for Data Centers’ PDUs
Utility Substation Multi-Circuit Monitoring
Power Quality Monitoring
Maximum Demand Indicator
The above are just a few of the many applications. Contact CET Technical Support should you require
further assistance with your application.
1.2 Features
Ease of use
Status LEDs - Run, Pulse and Comm. Activities
Self-Diagnostic function
Password-protected setup via the Front Panel
Compact, DIN Rail Mount for easy installation
Measurements
Class 0.5S Accuracy for Energy measurements
ULN & ULL per phase and average, ULN Phase Angles, Ung
Frequency
Sub Meters (SM)
Support 1-Ø and 3-Ø Sub Meters without configuration
12x1-Ø SM
oCurrent Magnitude and Phase Angles
okW, kvar, kVA and PF
oCurrent Loading Factor (%) and THD
okWh/kvarh Import/Export and kVAh
oCurrent/kW/kvar/kVA Demand and Max. Demand with Timestamp

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oOperating Time (Run Hour)
4x3-Ø SM
oI per phase, I average and In (Calculated)
oI Unbalance
oFrequency
okW/kvar/kVA Total and PF total
okWh/kvarh Import/Export/Total and kVAh Total
okW/kvar/kVA Total Demand and Max. Demand with Timestamp
oOperating Time (Run Hour)
Virtual Meters (VM)
Up to 4 Virtual Meters for arbitrary aggregation of 1-Ø SMs
kW/kvar/kVA Total (via communications only)
kWh/kvarh Import/Export and kVAh Total
kW/kvar/kVA Total Demand and Max. Demand with Timestamp (via communications only)
Power Quality Features
U and I THD/TOHD/TEHD
U and I Individual Harmonics up to 31st (via communications only)
U and I Unbalance
Logs
Data Recording Log
4MB Log Memory
Up to 60 parameters @ min. 1-min recording interval for 5,000 logs with timestamps
Daily Freeze Logs
1000 Daily Freeze Logs
1-Ø SM: Current, kW, kvar, kVA, kWh, kvarh Import/Export & kVAh
3-Ø SM and VM: kW, kvar, kVA Total, kWh, kvarh Import/Export & kVAh
Monthly Freeze Logs
24 Monthly Freeze Logs
1-Ø SM: kWh/kvarh Import, kWh/kvarh Export, kVAh
3-Ø SM and VM: kWh/kvarh Total Import, kWh/kvarh Total Export, kVAh Total
SOE Log
512 FIFO events time-stamped to ±1ms resolution
Setup changes, Alarms, Setpoint events, Self-Diagnosis and I/O operations
Alarming
Support High-High, High, Low, Low-Low and OFF Alarms
Configurable Threshold and Time Delay for each branch
Support Current, Voltage, Frequency, Unbalance, Phase Reversal, Phase Loss, AI and DI Alarms
All alarms are recorded in the SOE Log
Digital Inputs and Digital Outputs
12xDIs with external excitation @ 48VDC with programmable debounce
1xDO, mechanical relay @ 250VAC/5A or 30VDC/5A

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1xAI, 0~20mA
Communications
2xRS-485, optically isolated
Modbus RTU protocol
Baud rate @ 1,200 to 57,600
System Integration
The PMC-512-A is supported by CET’s PecStar iEMS. In addition, it can be easily integrated into other
3rd party Automation, Energy Management or SCADA systems because of its support of multiple
communications ports and Modbus RTU protocol.
1.3 PMC-512-A’ application in Monitoring Management Systems
1.4 Getting more information
Additional information is available from CET via the following sources:
Visit www.cet-global.com
Contact your local representative
Contact CET directly via email or telephone

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Chapter 2 Installation
2.1 Appearance
Figure 2-1 Appearance
Figure 2-2 Terminal Diagram
Caution
Installation of the PMC-512-A
should only be performed by qualified, competent personnel
that have the appropriate training and experience with high voltage and current devices.
The meter must be installed in accordance with all local and national electrical codes.
During the operation of the meter, hazardous voltages are present at the input terminals.
Failure to observe precautions can result in serious or even fatal injury and equipment
damage.

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2.2 Unit Dimensions
2.2.1 Main Unit
Figure 2-3 Main Unit Dimension
2.2.1 HMI
Front View
Side View
Figure 2-4 HMI Dimensions

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2.3 Overall Setup
Figure 2-5 Overall Setup
Figure 2-6 Overall Installation
2.4 Mounting
The PMC-512-A should be installed in a dry environment without dust and kept away from heat,
radiation and electrical noise sources. The PMC-512-A is usually installed inside the PDU cabinet. Please
reserve enough room for other accessories and make it convenient for future maintenance.
2.4.1 Mounting PMC-512-A
Installation steps:
Before installation, make sure that the DIN rail is already in place.

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Move the installation clips at the back of the PMC-512-A downward to the “unlock” position.
Align the top of the mounting channel at the back of the PMC-512-A at an angle against the top of
the DIN rail as shown in figure below.
Rotate the bottom of the PMC-512-A towards the back while applying a slight pressure to make
sure that the device is completely and securely fixed on to the DIN rail.
Push the installation clips upward to the “lock” position to secure the PMC-512-A on to the DIN
rail.
Figure 2-7 Mounting the Main Unit
2.4.2 Branch CTs and other Accessories
There are different types of Branch CTs available for the PMC-512-A. Please refer to Appendix D for their
complete specifications. Select the appropriate Branch CTs for your applications.
2.4.2.1 PMC-CT-100A-40mA-3P-A (Molded Case 3-Phase 100A CT)
Figure 2-8 PMC-CT-100A-40mA-3P-A Dimensions

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2.4.2.2 PMC-CT-250A-40mA-A (Solid-Core 1-Phase 250A CT)
Figure 2-9 PMC-CT-250A-40mA-A Dimensions
2.4.2.3 PMC-CT-400A-40mA-A (Solid-Core 1-Phase 400A CT)
Figure 2-10 PMC-CT-400A-40mA-A Dimensions
2.4.2.4 PMC-CT-800A-40mA-A (Solid-Core 1-Phase 800A CT)
Figure 2-11 PMC-CT-800A-40mA-A Dimensions

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2.4.2.5 PMC-SCCT-5A-1.667mA-10-A (Split-Core 1-Phase 5A CT)
Figure 2-12 PMC-SCCT-5A-1.667mA-10-A Dimensions
2.4.2.6 PMC-SCCT-100A-40mA-16-A (Split-Core 1-Phase 100A CT)
Figure 2-13 PMC-SCCT-100A-40mA-16-A Dimensions
2.4.2.7 PMC-SCCT-200A-40mA-24-A (Split-Core 1-Phase 200A CT)
Figure 2-14 PMC-SCCT-200A-40mA-24-A Dimensions

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2.4.2.8 PMC-SCCT-400A-40mA-35-A (Split-Core 1-Phase 400A CT)
Figure 2-15 PMC-SCCT-400A-40mA-35-A Dimensions
2.4.2.9 PMC-SCCT-800A-40mA-A (Split-Core 1-Phase 800A CT)
Front View
Side View
Figure 2-16 PMC-SCCT-800A-40mA-A Dimensions
2.4.2.10 PMC-BCC-3CT (3-Phase Termination Connector)
P1 Side
Pin
CT
PMC-512-A
1
1# S1 (+)
I1 or I4 or I7 or I10
2
1# S2 (-)
3
2# S1 (+)
I2 or I5 or I8 or I11
4
2# S2 (-)
5
3# S1 (+)
I3 or I6 or I9 or I12
6
3# S2 (-)
Table 2-1 PMC-BCC-3CT
2.4.3 Mounting the HMI
The HMI should be mounted on the cabinet door with a minimum clearance of 105cm from the door to
the inside components.
1. Put the HMI through the cutout.

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2. Install the installation clips as per the diagram below.
3. Affix the supplied screws through the hole of the installation clips.
4. Tighten the screws against the back of the panel until the HMI is mounted securely in place.
Figure 2-17 Mounting the HMI
2.5 Wiring Connections
The PMC-512-A provides 12 Current Inputs which can be configured as 12x1-Ø SM, 4x3-Ø SM or a
combination of 1-Ø SMs or 3-Ø SMs. Regardless of the Wiring Mode, the PMC-512-A always relies on
the relationship illustrated in Table 2-2 between Voltage Inputs (V1, V2, V3) and Current Inputs (I1 –I12)
for its Power and Energy calculations for the various 1-Ø and 3-Ø SMs. 2-Ø SM (or 1P3W Wiring Mode)
is not supported by the PMC-512-A. The SM assignment principle is not programmable. Therefore, it is
extremely important to allocate the 1-Ø and 3-Ø circuits during installation that meet this fixed
assignment principle.
3-Ø SM1
3-Ø SM2
3-Ø SM3
3-Ø SM4
1-Ø
SM1
1-Ø
SM2
1-Ø
SM3
1-Ø
SM4
1-Ø
SM5
1-Ø
SM6
1-Ø
SM7
1-Ø
SM8
1-Ø
SM9
1-Ø
SM10
1-Ø
SM11
1-Ø
SM12
V1
V2
V3
V1
V2
V3
V1
V2
V3
V1
V2
V3
I1
I2
I3
I4
I5
I6
I7
I8
I9
I10
I11
I12
Table 2-2 Relationship between Vxand Ix
2.5.1 Wiring Modes
The PMC-512-A supports the following Wiring Modes:
Single Phase (1P2W) Wiring with or without VG
3-Wire Delta (3P3W) Wiring with open N connection or with PTs
DANGER
Please make sure that the Voltage and Current circuits are not energized while connecting Voltage
inputs to the PMC-512-A.

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4-Wire Wye (3P4W) Wiring with or without VG, 4-Wire Wye (3P4W) Wiring with VG and PTs
2.5.1.1 Single Phase (1P2W) Wiring
Figure 2-18 1P2W with VG Figure 2-19 1P2W without VG
2.5.1.2 3-Wire Delta (3P3W) Wiring
Figure 2-20 3P3W without PTs
Figure 2-21 3P3W with PTs
2.5.1.3 4-Wire Wye (3P4W) Wiring
Figure 2-22 3P4W without PTs & with VG
Figure 2-23 3P4W without PTs & VG
Figure 2-24 3P4W with VG and PTs