CET PMC-D721MD User manual

PMC-D721MD
Digital Multifunction Meter
User Manual
Version: V1.0
June 25, 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
Chapter 1 Introduction ............................................................................................................................. 7
1.1 Overview ....................................................................................................................................7
1.2 Features......................................................................................................................................7
1.3 Getting more information ..........................................................................................................8
Chapter 2 Installation ............................................................................................................................... 9
2.1 Appearance ................................................................................................................................9
2.2 Unit Dimensions .......................................................................................................................10
2.3 Mounting..................................................................................................................................10
2.4 Input Wiring .............................................................................................................................11
2.5 Communications Wiring ...........................................................................................................11
2.6 Digital Input Wiring ..................................................................................................................11
2.7 Pulse Output Wiring .................................................................................................................12
2.8 Power Supply Wiring ................................................................................................................12
Chapter 3 Front Panel............................................................................................................................. 13
3.1 Display ......................................................................................................................................13
3.1.1 LCD Testing....................................................................................................................13
3.1.2 LCD Display Areas..........................................................................................................13
3.2 Using the Front Panel Buttons..................................................................................................15
3.3 LED Pulse Outputs ....................................................................................................................15
3.4 Display Screen Types ................................................................................................................15
3.5 Setup Configuration via the Front Panel ..................................................................................15
3.5.1 Making Setup Changes..................................................................................................16
3.5.2 Setup Menu ..................................................................................................................16
3.5.3 Configuration ................................................................................................................17
Chapter 4 Applications ........................................................................................................................... 18
4.1 Digital Inputs ............................................................................................................................18
4.2 Pulse Outputs ...........................................................................................................................18
4.3 Basic Measurement..................................................................................................................18
4.4 SOE ...........................................................................................................................................18
Chapter 5 Modbus Register Map............................................................................................................ 19
5.1 Basic Measurements ................................................................................................................19
5.2 SOE Log.....................................................................................................................................19
5.3 Device Setup.............................................................................................................................21
5.3.1 Basic Setup Parameters.................................................................................................21
5.3.2 I/O Setup Parameters....................................................................................................21
5.3.3 Energy Pulse Setup Parameter......................................................................................21
5.3.4 Communication Setup Parameters ...............................................................................21
5.4 Time..........................................................................................................................................21
5.5 Clear Control ............................................................................................................................22
5.6 Meter Information....................................................................................................................22
Appendix A Technical Specifications....................................................................................................... 24

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Appendix B Standards Compliance......................................................................................................... 25
Appendix C Ordering Guide ....................................................................................................................26
Contact us............................................................................................................................................... 27

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Chapter 1 Introduction
This manual explains how to use the PMC-D721MD DC Multifunction Meter. Throughout the manual
the term “meter” generally refers to all models. Differences between the models are indicated with
the appropriate model number.
This chapter provides an overview of the PMC-D721MD meter and summarizes many of its key
features.
1.1 Overview
The PMC-D721MD DC Multifunction Meter is CET’s latest offer for the low-cost DC metering market.
Housed in an industry standard DIN form factor measuring 72mmx72mmx71.8mm, it is perfectly suited
for industrial, commercial and utility DC metering applications. The PMC-D721MD complies with Class
0.5S kWh Accuracy Standard and features quality construction, multifunction measurements and a
bright, easy to read LCD display. The PMC-D721MD comes standard with two front panel LED
indicators for Energy Pulsing and Communication. It optionally provides two Digital Inputs for Status
Monitoring and two Solid State Pulse Outputs for kWh Energy Pulsing applications. The standard SOE
Log records meter events such as power-off, setup changes and DI operations in 1ms resolution. With
the standard RS485 port and Modbus protocol support, the PMC-D721MD becomes a vital component
of an intelligent, multifunction monitoring solution for any DC Power and Energy Management systems.
You can setup the meter through its front panel or via our free PMC Setup software. The meter is also
supported by our PecStar® iEMS Integrated Energy Management System.
Following is a list of typical applications for the PMC- D721MD:
DC Inverter, DC Panel Metering and DC Charging Station
Industrial and commercial DC metering
DC Distribution Monitoring
Contact CET Technical Support should you require further assistance with your application.
1.2 Features
Ease of use
Large, backlit LCD display with wide viewing angle
Intuitive user interface
LED indicators for Energy Pulsing and Communication activities
Password-protected setup via front panel or free PMC Setup software
Easy installation with mounting clips, no tools required
Measurements
Voltage, Current and kW
Bi-directional kWh measurements
SOE Log
32 events time-stamped to ±1ms resolution
Record all setup and Digital Input status changes

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Inputs and Outputs
2xFront Panel LED indicators for Energy Pulsing and Communication
Optional 2xDigital Inputs for Status Monitoring
Optional 2xSolid State Relay for kWh Imp and kWh Exp Pulse Output.
Communications
Standard RS-485 port with Modbus RTU support at 1200 to 19,200 bps equipped
System Integration
Supported by CET’s PecStar® iEMS and PMC Setup
Easy integration into other Automation, SCADA or BMS systems via Modbus RTU
1.3 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 Rear Panel (2DIs + 2DOs)
Caution
Installation of the PMC-D721MD 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
Figure 2-3 Dimension
2.3 Mounting
The PMC-D721MD meter should be installed in a dry environment with no dust and kept away from
heat, radiation and electrical noise source.
Installation steps:
Remove the installation clips from the meter
Fit the meter through a 68mmx68mm cutout as shown in Figure 2-4
Re-install the installation clips and push the clips tightly against the panel to secure the meter
Figure 2-4 Panel Cutout