CET PMC-340 User manual

PMC-340
Digital Three-Phase Energy Meter
User Manual
Version: V1.1A
May 8, 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 Inc. (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.
Standards Compliance
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
Chapter 1 Introduction........................................................................................................................ 8
1.1 Overview..............................................................................................................................8
1.2 Features...............................................................................................................................8
1.3 PMC-340’s application in Power and Energy Management Systems...............................10
1.4 Getting more information.................................................................................................11
Chapter 2 Installation........................................................................................................................12
2.1 Appearance .......................................................................................................................12
2.2 Unit Dimensions................................................................................................................12
2.3 Terminal Dimensions.........................................................................................................13
2.4 Mounting...........................................................................................................................13
2.5 Wiring Connections...........................................................................................................14
2.5.1 Direct Input Wiring.................................................................................................14
2.5.2 CT Input Wiring ......................................................................................................14
2.6 RS-485 Wiring....................................................................................................................15
2.7 Digital Input Wiring ...........................................................................................................15
2.8 Pulse Output Wiring..........................................................................................................15
Chapter 3 Front Panel .......................................................................................................................16
3.1 LED Indicator .....................................................................................................................16
3.2 Buttons ..............................................................................................................................16
3.3 LCD Display ........................................................................................................................17
3.4 LCD Testing ........................................................................................................................17
3.5 Default Display ..................................................................................................................17
3.6 Setup Configuration ..........................................................................................................18
3.6.1 Functions of buttons ..............................................................................................18
3.6.2 Setup Menu............................................................................................................20
3.6.3 Configuration..........................................................................................................20
Chapter 4 Applications......................................................................................................................23
4.1 Inputs and Outputs ...........................................................................................................23
4.1.1 Digital Inputs (PMC-340B Only) .............................................................................23
4.1.2 Energy Pulse Output ..............................................................................................23
4.2 Power and Energy .............................................................................................................24
4.2.1 Basic Measurements..............................................................................................24
4.2.2 Energy Measurements...........................................................................................24
4.2.3 Demand Measurements ........................................................................................24
4.3 Power Quality....................................................................................................................25
4.3.1 Phase Angles ..........................................................................................................25
4.3.2 Power Quality Parameters .....................................................................................25
4.3.3 Unbalance ..............................................................................................................26
4.4 Logging ..............................................................................................................................27
4.4.1 Max./Min. Log........................................................................................................27
4.4.2 Monthly Energy Log ...............................................................................................27
4.4.3 Peak Demand Log...................................................................................................28

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4.4.4 SOE Log (PMC-340B Only)......................................................................................28
4.4.5 Data Recorder Log (PMC-340B Only).....................................................................28
4.5 Time of Use (TOU).............................................................................................................29
Chapter 5 Modbus Register Map....................................................................................................... 31
5.1 Basic Measurements .........................................................................................................31
5.2 Energy Measurements ......................................................................................................33
5.2.1 3-Phase Energy Measurements .............................................................................33
5.2.2 Phase A (L1) Energy Measurements......................................................................34
5.2.3 Phase B (L2) Energy Measurements ......................................................................34
5.2.4 Phase C (L3) Energy Measurements ......................................................................35
5.3 DI Pulse Counter (PMC-340B Only)...................................................................................35
5.4 Harmonic Measurements .................................................................................................35
5.4.1 Power Quality Measurements ...............................................................................35
5.4.2 Current Harmonic Measurements.........................................................................36
5.4.3 Voltage Harmonic Measurements .........................................................................36
5.5 Demands............................................................................................................................36
5.5.1 Present Demands...................................................................................................36
5.5.2 Peak Demand Log of This Month (Since Last Reset) .............................................37
5.5.3 Peak Demand Log of Last Month (Before Last Reset) ...........................................37
5.6 Max./Min. Log ...................................................................................................................38
5.6.1 Max. Log of This Month (Since Last Reset)............................................................38
5.6.2 Min. Log of This Month (Since Last Reset).............................................................38
5.6.3 Max. Log of Last Month (Before Last Reset)..........................................................39
5.6.4 Min. Log of Last Month (Before Last Reset) ..........................................................40
5.6.5 Max./Min. Log Structure........................................................................................41
5.7 Monthly Energy Log ..........................................................................................................41
5.8 SOE Log (PMC-340B Only).................................................................................................42
5.9 Data Recorder Log (PMC-340B Only)................................................................................43
5.10 Device Setup....................................................................................................................44
5.10.1 Basic Setup Parameters........................................................................................44
5.10.2 I/O Setup ..............................................................................................................45
5.10.3 Communication Setup Parameters......................................................................45
5.11 Data Recorder Setup (PMC-340B Only) ..........................................................................46
5.12 TOU Setup........................................................................................................................46
5.12.1 Basic......................................................................................................................46
5.12.2 Season ..................................................................................................................47
5.12.3 Daily Profile ..........................................................................................................48
5.12.4 Alternate Days......................................................................................................49
5.13 Time.................................................................................................................................50
5.14 Clear/Reset Control.........................................................................................................51
5.15 Meter Information ..........................................................................................................52
Appendix A Data Recorder Parameter List......................................................................................... 53
Appendix B Technical Specifications .................................................................................................. 55
Appendix C Standards of Compliance................................................................................................ 56

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Appendix D Ordering Guide .............................................................................................................. 57
Contact us.........................................................................................................................................58

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Chapter 1 Introduction
This manual explains how to use the PMC-340 Series Digital Three-Phase Energy Meter. Throughout
the manual the term “meter” generally refers to all models.
This chapter provides an overview of the PMC-340 meter and summarizes many of its key features.
1.1 Overview
The PMC-340 Series Digital Three-Phase Energy Meter is CET’s latest offer for the low voltage
power/energy metering market featuring DIN rail mount, high accuracy, multifunction measurements
and a large, easy to read LCD display. The PMC-340 complies with the IEC 62053-21 Class 1 and IEC
62053-22 Class 0.5S kWh Accuracy Standards for 100A Direct Input and 5A CT Input, respectively. The
PMC-340 comes standard with a LED as well as a Solid State Pulse Output for energy pulsing. The
PMC-340 optionally provides 2MB memory for Data Recording and 3 Digital Inputs for status
monitoring, Tariff switching or pulse counting for collecting WAGES (Water, Air, Gas, Electric and Steam)
information. The standard RS-485 port and Modbus protocol support allows the PMC-340 to become
a vital component of an intelligent, multifunction monitoring solution for any Power and Energy
Management Systems.
You can setup the meter via our free PMC Setup software. The meter is also supported by our
PecStar® Integrated Energy Management System.
The PMC-340 is available in two models: PMC-340A and PMC-340B. Following is a list of typical
applications for the PMC-340:
DIN rail mount energy metering
Industrial and commercial metering
Substation, building and factory automation
Sub-metering
Power quality monitoring
1.2 Features
Ease of use
Easy to read LCD
Two LED indicators for energy pulsing and communications activities
Password-protected setup via front panel or free PMC Setup software
Easy installation with DIN rail mounting, no tools required
3-phase power supply, no external control power required
Basic Measurements
Multifunction measurements
oVoltage, Current, kW, kvar, kVA, PF, Phase Angle and Frequency
oPer phase kWh and kvarh Imp/Exp/Tot/Net and kVAh
o4-Quadrant kvarh
oDevice Operating Time (Running Hour)
oVoltage/Current THD, THOD, THED, Individual harmonics up to 31st and Unbalance
oCurrent TDD, TDD Odd, TDD Even, K-factor and Crest Factor
okW/kvar/kVA Total Demands. Max. Demands and Max Demands per Tariff

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oPer Phase Current Demands and Max. Demands
oMax./Min. Log
Two TOU schedules, each providing
o12 Seasons
o20 Daily Profiles, each with 12 Periods in 15-minute interval
o90 Holidays or Alternate Days
o4 Tariffs, each providing the following information
okWh/kvarh Imp/Exp, kVAh
okW/kvar/kVA Max. Demands of This Month (Since Last Reset) and Last Month (Before
Last Reset)
12 monthly recording of kWh/kvarh Import/Export/Total/Net, kVAh, kvarh Q1-Q4 as well as
kWh/kvarh Import/Export and kVAh per Tariff
Front Panel & Communication Programming Counters (PMC-340B only)
SOE Log (PMC-340B only)
16 events time-stamped to ±1ms resolution
Setup changes, Digital Input status changes
Data Recorder (PMC-340B only)
One Data Recorder Log of maximum 16 parameters
Recording Interval from 1s to 40 days
Configurable Depth and Recording Offset
2MB Log Memory
Digital Inputs (PMC-340B only)
3 channels for external status monitoring, pulse counting and Tariff switching
Self-excited, internally wetted at 24VDC
1000Hz sampling
Energy Pulse Outputs
1 LED Pulse Output on the front panel for energy pulsing application
1 Solid State Digital Relay Output for energy pulsing application
Communications
Optically isolated RS-485 port, baud rate from 1,200 to 19,200 bps
Modbus RTU protocol
Real-time Clock
Battery-backed real-time clock @ 6ppm
Clock error ≤ 0.5s/day
Can be set through front panel or communication
System Integration
Supported by our PecStar® iEMS and PMC Setup
Easy integration into other Automation or SCADA systems via Modbus RTU protocol

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Features and Options List
Features and Options
PMC-340 Models
A
B
Real-time Measurements
Uln/Ull per phase and Average


Current per phase and Average, In


kW/kvar/kVA per phase and Total


PF per phase and Total


Frequency


Demands and Peak Demands


Energy Measurements (per phase and 3-phase total)
kWh Imp, Exp, Net, Total


kvarh Imp, Exp, Net, Total


kVAh Total


4-Quadrant kvarh


TOU Energy (4 Tariffs)


Power Quality
Voltage and Current Unbalance


THD, THOD, THED, K-Factor, Crest-Factor, TDD


Individual Harmonics (2nd to 31st)


Logging
Max./Min. & Peak Demand Recording


12 Monthly Energy Log


SOE Log
-

Data Recorder Log with 2MB Memory
-

Inputs and Outputs
DI
-
3
Energy Pulse Output (Solid State Relay)
1
1
LED Energy Pulse Output
1
1
Communications
RS-485 Port


1.3 PMC-340’s application in Power and Energy Management Systems
The PMC-340 series meter can be used to monitor Wye connected power system. Modbus
communications allow real-time data and other information to be transmitted across a RS-485 network
to an Integrated Energy Management System such as PecStar® iEMS.