CET PMC-352 User manual

PMC-352
3-Phase LoRa DIN Energy Meter
User Manual
Version: V1.0A
July 27, 2020

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.

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.

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 ........................................................................................................................... 1
1.1 Overview................................................................................................................................... 1
1.2 Features .................................................................................................................................... 1
1.3 PMC-352’s application in a wireless IoT based EMS using LoRa network................................. 2
1.4 Getting more information......................................................................................................... 2
Chapter 2 Installation.............................................................................................................................. 3
2.1 Appearance............................................................................................................................... 3
2.1.1 Main Unit .......................................................................................................................3
2.1.2 LED Indicator..................................................................................................................3
2.1.3 Split-Core CT Appearances & Specifications ..................................................................4
2.1.4 Antenna Appearances & Specifications .........................................................................4
2.1.5 Connecting Cable (For 800A/40mA and 1600A/40mA SCCT only) ................................4
2.2 Dimensions ............................................................................................................................... 5
2.2.1 Unit Dimensions.............................................................................................................5
2.2.2 Terminal Dimensions......................................................................................................5
2.2.3 CT Dimensions ...............................................................................................................6
2.2.4 NTC Dimensions .............................................................................................................7
2.3 Mounting .................................................................................................................................. 7
2.4 Wiring Mode ............................................................................................................................. 8
2.5 SCCT Installation ..................................................................................................................... 10
2.5.1 Wiring for 5A/2mA, 100A/40mA, 200A/40mA or 400A/40mA SCCT...........................10
2.5.2 Wiring for 800A/40mA or 1600A/40mA SCCT .............................................................10
2.6 LoRa Antenna Installation ....................................................................................................... 11
2.7 RS-485 Wiring ......................................................................................................................... 11
2.8 Digital Input Wiring................................................................................................................. 11
2.9 NTC Input Wiring..................................................................................................................... 12
2.10 Power Supply Wiring............................................................................................................. 12
Chapter 3 Applications.......................................................................................................................... 13
3.1 Inputs ...................................................................................................................................... 13
3.1.1 Digital Inputs ................................................................................................................13
3.1.2 NTC Temperature Input................................................................................................13
3.2 Power and Energy ................................................................................................................... 13
3.2.1 Basic Measurements....................................................................................................13
3.2.2 Energy Measurements.................................................................................................13
3.2.3 Demand Measurements ..............................................................................................14
3.3 Power Quality ......................................................................................................................... 14
3.3.1 Phase Angles ................................................................................................................14
3.3.2 Unbalance ....................................................................................................................14
3.3.3 Harmonics....................................................................................................................14
3.4 Setpoints................................................................................................................................. 15
3.5 SOE Log ................................................................................................................................... 17
3.6 Diagnostics.............................................................................................................................. 17
3.6.1 Voltage Phase Loss.......................................................................................................17
3.6.2 Current Phase Loss.......................................................................................................18
Chapter 4 Modbus Register Map.......................................................................................................... 19
4.1 Basic Measurements............................................................................................................... 19
4.2 Energy Measurements............................................................................................................ 20
4.2.1 3-Phase Energy Measurements ...................................................................................21
4.2.2 Phase A (L1) Energy Measurements ............................................................................21
4.2.3 Phase B (L2) Energy Measurements.............................................................................21
4.2.4 Phase C (L3) Energy Measurements.............................................................................21
4.3 DI Pulse Counter ..................................................................................................................... 22
4.4 User-defined Data Map........................................................................................................... 22
4.5 Harmonic Measurements ....................................................................................................... 22

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4.5.1 Power Quality Measurements .....................................................................................22
4.5.2 Current Harmonic Measurements ...............................................................................23
4.5.3 Voltage Harmonic Measurements ...............................................................................23
4.6 Present Demands.................................................................................................................... 23
4.7 SOE Log ................................................................................................................................... 23
4.8 Device Setup ........................................................................................................................... 26
4.8.1 Basic Setup...................................................................................................................26
4.8.2 I/O Setup......................................................................................................................26
4.8.3 Comm. Setup ...............................................................................................................27
4.8.4 Setpoint Setup .............................................................................................................27
4.8.5 User-defined Data Map................................................................................................28
4.9 Time ........................................................................................................................................ 29
4.10 Clear/Reset Control............................................................................................................... 30
4.11 Meter Information ................................................................................................................ 30
Appendix A Technical Specifications..................................................................................................... 32
Appendix B Standards of Compliance................................................................................................... 33
Appendix C Ordering Guide .................................................................................................................. 34
Contact us ............................................................................................................................................. 36

CET Electric Technology
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Chapter 1 Introduction
This manual explains how to use the PMC-352 3-Phase LoRa DIN Energy Meter. Throughout the manual
the term “meter” generally refers to all models.
This chapter provides an overview of the PMC-352 meter and summarizes many of its key features.
1.1 Overview
The PMC-352 3-Phase LoRa DIN Energy Meter is CET’s latest offer for the wireless IoT energy
monitoring market using the LoRa technology for its wireless communication capability. Designed in a
compact DIN form factor measuring 36x65x90mm, it is perfect for energy and condition monitoring
applications in space-limited power distribution board. The PMC-352 comes standard with 4xNTC
Inputs for temperature monitoring and 3xDI for status monitoring. With a standard RS-485 and
optionally LoRa supporting the Modbus RTU protocol and IEC 62053-21 Class 1 compliance, the PMC-
352 becomes a vital component of an intelligent, distributed and wireless loT based EMS or Condition
Monitoring System.
You can setup the meter via our free PMC Setup. The meter is also supported by our PecStar® iEMS
Integrated Energy Management System.
Following is a list of typical applications for the PMC-352:
Industrial, Commercial and Utility Substation Monitoring
Sub-metering and Cost Allocation
Wireless Energy & Condition Monitoring of Busbar or Machines
Building, Factory and Process Automation
Energy Management and Power Quality Monitoring
Production Line Energy Management Refinement
1.2 Features
Ease of use
Easy installation with DIN Rail mounting, no tools required
Simple commissioning and low-deployment cost with Split-Core CT and wireless IoT
communication
Basic Measurements
ULN, ULL and I per Phase and Average
P, Q, S and PF per Phase and Total
kWh, kvarh Import/Export/Net/Total and kVAh Total
Frequency and Device Operating Time (Running Hours)
Enhanced Measurements
U and I THD, TOHD, TEHD and Individual Harmonics up to 31st
U and I Unbalance and Phase Angles
Fundamental kW and PF
kvarh Q1-Q4
Present Demands for kW/kvar/kVA total and per Phase Current
Setpoints
10 user programmable Setpoints with extensive list of monitoring parameters including Voltage,
Current, Power and THD, etc.
Configurable thresholds, time delays and parameters
SOE Log
16 events time-stamped to ±1ms resolution
Setup changes, Setpoint, DI status changes, Clear Actions, etc.
Standard I/O
3xDI for Status Monitoring or Utility Pulse Counting
4xNTC Inputs for Temperature Monitoring (sensor not included)

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Diagnostics
Frequency Out-of-Range, Loss of Voltage / Current
kW Direction per Phase and Total, Possible incorrect CT Polarity
Incorrect U & I Phase Sequence
Communications
Optically isolated RS-485 port at 1200 to 38,400 bps
Built-in LoRa with configurable ISM Bands for EU863-870, RU864-870, IN865-867, US902-928,
AU915-928, AS920-923 and AS923-925
Modbus RTU protocol
System Integration
Supported by our PecStar® iEMS and PMC Setup Software
Easy integration into other Automation or SCADA systems via Modbus RTU protocol
1.3 PMC-352’s application in a wireless IoT based EMS using LoRa network
The PMC-352 can be used to monitor 3-phase or single-phase power system and become a vital
component of an intelligent, distributed and wireless loT based EMS or Condition Monitoring System.
Figure 1- 1 PMC-352’s application in a wireless IoT based EMS using LoRa network
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 [e-mail]

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Chapter 2 Installation
2.1 Appearance
2.1.1 Main Unit
Figure 2-1 Appearance
2.1.2 LED Indicator
There are six LED indicators on the PMC-352’s Front Panel as described below:
Indicator
Color
Status
Description
L1/L2/L3
Green
On
Register 6040 is enabled and
the corresponding Voltage Phase is active
Off
Register 6040 is enabled and
the corresponding Voltage Phase is inactive
All off
Register 6040 is disabled
Run
Green
Blink for one second
Device is running normally
Off
Power Off or Device is running abnormally
Alarm
Red
Flashing
Energy Pulsing if enabled
On
Energy Pulse Disabled and Setpoint Alarm
Comm.
Green
Flashing
Receiving or transmitting data via RS-485 or LoRa
Off
No Communication
Table 2-1 LED Indicators
Caution
Installation of the PMC-352 should only be performed by qualified, competent personnel who 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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4
2.1.3 Split-Core CT Appearances & Specifications
Figure 2-2 Split-Core CT Appearances & Specifications
2.1.4 Antenna Appearances & Specifications
Figure 2-3 Antenna Appearances & Specifications
2.1.5 Connecting Cable (For 800A/40mA and 1600A/40mA SCCT only)
Figure 2-4 Connecting Cable