CET PMC-T402 User manual
PMC-T402
Temperature & Iresidual Monitor
User Manual
Version: V1.0
November 09, 2017
CET Inc.
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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 Electric Technology (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 device should only be
performed by qualified, competent personnel that have the appropriate
training and experience with high voltage and current devices. The device 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 device.
Before connecting the device to the power source, check the label on top of
the device 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 device, 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 device for primary protection functions where failure of the
device can cause fire, injury or death. The device should only be used for
shadow protection if needed.
Under no circumstances should the device be connected to a power source if
it is damaged.
To prevent potential fire or shock hazard, do not expose the device 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
device 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 device malfunctions. CET
accepts no responsibility for the suitability of the device to the application for
which it was purchased.
Failure to install, set up or operate the device according to the instructions herein
will void the warranty.
Only CET’s duly authorized representative may open your device. 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 Dimensions .........................................................................................................................10
2.2.1 Main Unit.................................................................................................................10
2.2.2 Terminal...................................................................................................................10
2.2.3 Residual Current CTs ................................................................................................11
2.2.4 PT100.......................................................................................................................12
2.3 Mounting ............................................................................................................................ 12
2.4 RS-485 Wiring .....................................................................................................................14
2.5 Digital Output Wiring .......................................................................................................... 14
2.6 Residual Current Input Wiring .............................................................................................14
2.7 RTD Input Wiring.................................................................................................................15
2.8 Power Supply Wiring...........................................................................................................15
Chapter 3 Front Panel .......................................................................................................................16
3.1 LED Indicator....................................................................................................................... 16
3.2 Buttons ...............................................................................................................................16
3.3 LED Display .........................................................................................................................17
3.3.1 LED Display Symbols.................................................................................................17
3.3.2 LED Testing...............................................................................................................17
3.3.3 Default Display .........................................................................................................17
3.3.4 Data Display .............................................................................................................18
3.3.5 SOE Display ..............................................................................................................18
3.4 Setup Configuration ............................................................................................................ 19
3.4.1 Making Setup Changes.............................................................................................19
3.4.2 Setup Menu .............................................................................................................20
3.4.3 Configuration ...........................................................................................................21
Chapter 4 Applications......................................................................................................................23
4.1 Condition Monitoring..........................................................................................................23
4.1.1 Residual Current Monitoring ....................................................................................23
4.1.2 Temperature Alarm ..................................................................................................23
4.2 Digital Output ..................................................................................................................... 25
4.3 SOE Log...............................................................................................................................25
Chapter 5 Modbus Register Map....................................................................................................... 26
5.1 Basic Measurements ...........................................................................................................26
5.2 SOE Log...............................................................................................................................27
5.3 Device Setup .......................................................................................................................28
5.4 Time.................................................................................................................................... 29
5.5 Remote Control...................................................................................................................30
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5.6 Device Information..............................................................................................................30
Appendix A Technical Specifications.................................................................................................. 31
Appendix B Standards of Compliance................................................................................................32
Appendix C Ordering Guide...............................................................................................................33
Contact us.........................................................................................................................................34
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Chapter 1 Introduction
This manual explains how to use the PMC-T402 Temperature & Iresidual Monitor.
This chapter provides an overview of the PMC-T402 and summarizes many of its key features.
1.1 Overview
The PMC-T402 is CET’s latest offer for the Temperature (RTD) and Residual Current monitoring for the
Commercial and Industrial markets. Housed in a compact form factor measuring only
72(L)×72(H)×87.8(D)mm, the PMC-T402 can be used as a stand-alone device that offers real-time
monitoring and alarming of Residual Current and Temperature with its LED display, Front Panel buttons,
1xDO for Alarm Output or General Purpose Control and a built-in Alarm Buzzer. With the standard RS-
485 port and Modbus RTU protocol support, the PMC-T402 becomes a vital component of an
intelligent, centralized Condition Monitoring.
Intelligent Electrical Fire and Condition Monitoring for Industrial or Commercial facilities
Industrial and Commercial Electrical Power System
AC Low Voltage Distribution System
Condition monitoring of electrical equipment
1.2 Features
Ease of use
Bright 2-line LED display with high visibility for Temperature and Residual Current measurements
LED Indicators for Run, Fault, Warning, Alarm, Comm. Activities, Measurement Channel and Unit
indicators
Built-in Alarm Buzzer
Password-protected setup via front panel or free PMC Setup software
Panel or DIN Rail (with adapter) Mount
Support Firmware Upgrade over Communications
Residual Current Measurement
4 channels Residual Current Input (CT not included)
Two Setpoint Alarm Levels between 20 and 1000mA
Temperature Measurement
4 channels RTD Input (PT100 sensor not included)
Two Setpoint Alarm levels between 45°C and 140°C
SOE Log
64 events time-stamped to ±1ms resolution
Setup changes, Setpoint Alarms, Power Reset …etc.
Digital Output
1 Form A mechanical DO (3A @ 250VAC or 30VDC)
Can be used for Alarm Output or General Purpose Control
Communications
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Chapter 2 Installation
2.1 Appearance
Figure 2-1 Appearance
Caution
Installation of the PMC-T402 should only be performed by qualified, competent personnel
that have the appropriate training and experience with high voltage and current devices.
The monitor must be installed in accordance with all local and national electrical codes.
During the operation of the monitor, 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 Dimensions
2.2.1 Main Unit
Figure 2-2 Main Unit Dimensions
2.2.2 Terminal
Figure 2-3 Terminal Dimensions
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Terminal
Terminal Dimension (mm)
Wire Size (mm2)
Max. Torque
1
DO & RS-485
2.5 x 2.8
1.5
4.5 kgf.cm/M2.5
(3.9 lb-in)
2
TCn
3
IRn
4
Power Supply
6.0 x 6.0
1.0mm2- 2.5mm2
(14AWG - 22AWG)
6.0 kgf.cm/M3
(5.2 lb-in)
Table 2-1 Terminal Dimensions
2.2.3 Residual Current CTs
PMC-MIR-46 (160A, Ø=46mm)
Figure 2-4 PMC-MIR-46 Dimensions
PMC-MIR-80 (400A, Ø=80mm)
Figure 2-5 PMC-MIR-80 Dimensions
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PMC-MIR-120 (1000A, Ø=120mm)
Figure 2-6 PMC-MIR-120 Dimensions
PMC-MIR-220x50 (630A, 220x50mm)
Figure 2-7 PMC-MIR-220x50 Dimensions
2.2.4 PT100
Figure 2-8 PT100 Dimensions
2.3 Mounting
The PMC-T402 should be installed in a dry environment with no dust and kept away from heat,
radiation and electrical noise source. The PMC-T402 supports two installation modes: Panel mount
and DIN-Rail mount.
Panel Installation steps:
oRemove the installation clips from the PMC-T402
oFit the PMC-T402 through a 68mm x 68mm cutout as shown in Figure 2-9
oRe-install the installation clips and push the clips tightly against the panel to secure the PMC-
T402
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Figure 2-9 Panel Installation
DIN-Rail Installation steps:
oBefore installation, please make sure that the DIN rail and the adapter are already in place.
oRemove the installation clips from the PMC-T402
oFit the PMC-T402 through the adapter as shown in Figure 2-10
oRe-install the installation clips and push the clips tightly against the adapter to secure the
PMC-T402
Figure 2-10 DIN-Rail Installation
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2.4 RS-485 Wiring
The PMC-T402 provides a standard RS-485 port that supports the Modbus RTU protocol. Up to 32
devices can be connected on a RS-485 bus. The overall length of the RS-485 cable connecting all
devices should not exceed 1200m.
If the master station does not have a RS-485 communications port, a RS-232/RS-485 or USB/RS-485
converter with optically isolated outputs and surge protection should be used. The following figure
illustrates the RS-485 connections on the PMC-T402.
Figure 2-11 RS-485 Connections
2.5 Digital Output Wiring
The following figure illustrates the Digital Output connections on the PMC-T402:
Figure 2-12 DO Connections
2.6 Residual Current Input Wiring
The following figures illustrate the Residual Current Input connection on the PMC-T402 and typical
wiring with a 3P4W system, respectively:
Figure 2-13 Residual Current Input Connections
Notes:
1) The Residual Current terminals (either IR11 or IR12) should be left open and should not be connected to ground if unused.
Otherwise, doing so would damage the device.
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2) The alarming feature of the Residual Current measurement is disabled by default and can be enabled via the Front Panel or
through communications.
3) Please ensure that the device power is OFF when connecting the Residual Current CT.
2.7 RTD Input Wiring
The following figure illustrates the Temperature Input connections on the PMC-T402:
Figure 2-14 Temperature Input Connections
Notes:
1) The alarming feature of the Temperature measurement is disabled by default and can be enabled via the Front Panel or
through communications.
2) Please ensure that the device power is OFF when connecting the RTD.
2.8 Power Supply Wiring
The following figure illustrates the Power Supply connections on the PMC-T402:
Figure 2-15 Power Supply Connections
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Chapter 3 Front Panel
The PMC-T402 has a bright 2-line LED display and 4 buttons for both data display and setup
configuration purposes.
Figure 3-1 Front Panel Display
3.1 LED Indicator
There are 17 LED indicators on the PMC-T402’s front panel as described below:
LED Indicator
Color
Description
Run
Green
Blinking when the system is running normally
IR1~IR4
TC1~TC4
Green
Lit if the corresponding IRn or TCn measurement or Alarm/Fault event is
displayed
Warn
Red
Lit if any measurement has breached the Warning Setpoint Limit
Alarm
Red
Lit if any measurement has breached its Alarm Setpoint Limit
Mute
Green
Lit if the activated buzzer is muted (by pressing < /Mute> button)
Comm.
Green
Blinking when communicating
mA/°C/s
Green
Lit to display the present measurement unit
Table 3-1 LED Indicators
3.2 Buttons
Buttons
Data Display Mode
Setup Configuration Mode
Alarm/Fault Mode
< /Diag.>
Pressing this button
scrolls to the next
available parameter
or menu item.
If the selected parameters is a
numeric value, pressing this
button moves the cursor to
the left by one position. Once
the cursor has reached the
left most digit, pressing this
button returns to the first
digit.
Pressing this button
queries other Fault or
Alarm events under the
event display screen.
< /Mute>
Pressing this button
scrolls to the
previous available
parameter or menu
item.
If the selected parameter is
a numeric value, pressing
this button increments the
selected digit. Once the
number reaches to 9,
pressing this button again
will become to 0.
If the selected parameter is
an enumerated value,
pressing this button scrolls
through the enumerated
When the buzzer is
active due to an Alarm
or a Fault, pressing this
button for one second
mutes the sound.
Under an Alarm event
screen, pressing this
button switches to the
Fault event screen.
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list.
</Enter>
This button is
ignored in the Data
Display mode.
Pressing this button for
three seconds toggles
between Data Display mode
and Setup Configuration
Mode.
Once inside the Setup
Configuration mode,
pressing this button selects
a parameter for
modification. After
changing the parameter,
pressing this button again
saves the new setting into
memory.
This button is ignored in
the Alarm/Fault Mode.
</Esc>
Pressing this button
returns to the
previous menu
level.
Press this button to discard
the changes or cancel the
current operation.
Pressing this button for
three seconds to reset the
Alarm and Fault.
Table 3-2 Buttons Description
3.3 LED Display
3.3.1 LED Display Symbols
The following table shows the special LED display symbols:
Label
Description
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
Y
0
1
2
3
4
5
6
7
8
9
Table 3-3 LED Display Segments
3.3.2 LED Testing
Pressing < /Diag.> button for one second enters the LED Testing mode. During testing, all LED
segments and indicators are illuminated for 1 second. This cycle will repeat 6 times to allow for the
detection of faulty LED segments or indicators. In addition, the Alarm Buzzer will sound for 3 seconds
first and then short sound for 3 times during illumination LED segments and indicators. The LED will
return to its normal display mode afterwards.
3.3.3 Default Display
The PMC-T402 has a Default Display that shows the IR1 and IR2 parameters as shown below. The user
can use the < /Diag.> and < /Mute>> buttons to scroll and display other parameters. Please refer
to Section 3.2 above for a complete description of the front panel and button operations.
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Figure 3-2 Default Display
3.3.4 Data Display
The following table illustrates the available measurements under the Data Display Mode.
Menu
Display screens
Measurements
IRn
Display 1
IR1
IR2
Display 2
IR3
IR4
TCn
Display 1
TC1
TC2
Display 2
TC3
TC4
DO
Display 1
DO Status
Table 3-4 PMC-T402 Data Display Pages
3.3.5 SOE Display
The PMC-T402 can display Alarm/Fault events on its LED. The users can scroll the display screens by
pressing < /Diag.> button. When there is an Alarm or a Fault event:
The Front Panel displays the Alarm/Fault channel and the detailed information
The Alarm buzzer would sound
The correspond IRn/TCn LED indicator and Alarm/Fault indicator would be lit
The Alarm event has a higher priority than the Fault event. Users can press < /Mute> button to switch
to the Fault event screen. Once there is no more Alarm or Fault event, the display will return to the
Default Display screen automatically. In addition, users can query other Fault or Alarm events by
pressing < /Diag.> under an event screen.
Examples of Event Log Display:
IRn/TCn Alarm Events:
Figure 3-3 IRn/TCn Alarm Events
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IRn/TCn Fault Events:
Figure 3-4 IRn/TCn Fault Events
3.4 Setup Configuration
3.4.1 Making Setup Changes
1) Entering the Password:
Press < /Enter> for three seconds to enter Setup Configuration mode, and the LED displays
PROG.
Press < /Diag.> to advance to the Password page.
A correct password must be entered before changes are allowed. The factory default password is
“0000”.
Press< /Diag.> to shift the cursor to the left by one position and press < /Mute>to increment
the numeric value for the password.
When the password has been entered, pressing < /Diag.> or < /Mute>advances to the setup
menu if the password is correct.
2) Selecting a parameter to change:
Press < /Diag.>or < /Mute> to scroll to the desired sub-menu or parameter.
Press < /Enter> to select the sub-menu or parameter. Once a parameter has been selected, its
value will blink.
3) Changing and saving a setup parameter:
For a Numeric parameter, press < /Diag.> to shift the cursor to the left by one position. Press <
/Mute>to increment the numeric value
For an Enumerated parameter, press < /Mute>to scroll through the enumerated list.
After modification, press </Enter> to save the change into memory or </Esc> to exit the
currently selected parameter without change.
Repeat step 3) until all setup parameters have been changed.
4) Exiting the Setup Mode
Press < /Enter> for three seconds to return to the Display Mode.
Also, the Setup Mode will be automatically exited if there is a period of inactivity of 5 minutes or
longer.
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3.4.2 Setup Menu
Figure 3-5 Setup Menu
Table of contents
