TE Connectivity DRS-CT-3P-MOD-2T User manual

1 Introduction
3 Measurements
3.3 Power
Each successive press of the
button select a new range:
This document provides operating, maintenance and installation
instructions. This unit measures and displays the characteristics
of Single Phase Two Wire (1P2W), Three Phase Three Wire
(3P3W) and Three Phase Four Wire (3P4W) networks. The
measuring parameters include Voltage (V), Current (A),
Frequency (Hz), Power (kW/KVA/KVAr), Power Factor (PF),
Imported, Exported and Total Energy (kWh/kVArh).The unit also
measures Maximum Demand Current and Power, this is
measured over preset periods of up to 60 minutes.
The buttons operate as follows:
Selects the Voltage and Current display screens. In
Set-up Mode, this is the “Left” or “Back” button.
Select the Frequency and Power factor display
screens. In Set-up Mode, this is the “Up” button.
Select the Power display screens.
In Set-up Mode, this is the “Down” button.
Select the Energy display screens. In Set-up mode,
this is the “Enter” or “Right” button.
Instantaneous Active
Power in kW.
User Manual
DRS-CT-3P-MOD-2T
DIN Rail Energy Meter for CT Connected
Three Phase Electrical Systems
DUAL TARRIF
Instantaneous Reactive Power in
kVAr.
It also comes with a complete comms capability with built in
Pulse and RS485 Modbus RTU outputs, configuration is
password protected.
3.1 Voltage and Current
Each successive press of the
parameter:
button selects a new
This unit is 1A or 5A current transformer operated.
Auxiliary powered.
Instantaneous Volt-Amps in KVA.
1.1 Unit Characteristics
Phase to neutral voltages.
The DRS-CT-3P can measure and display:
•Phase to Neutral Voltage and THD%(Total
Harmonic Distortion) of all Phases
•Line Frequency
•Current, Maximum Demand Current and Current
THD% of all Phases
•Power, Maximum Power Demand and PowerFactor
•Imported, Exported & Total Active Energy
•Imported, Exported & Total ReactiveEnergy
Total kW, kVArh, kVA.
Phase to Line voltages
3.4 Energy Measurements
Each successive press of the
button selects a new range:
Current on each phase.
The unit has a Password-Protected set up menu for:
•Changing the Password
•System Configuration - 1P2W, 3P3W, 3P4W.
•Demand Interval Time
•Reset for Demand Measurements
•Pulsed Output Duration
Voltage THD% per phase
1.2 RS485 Serial –Modbus RTU
RS485 serial port with Modbus RTU protocol to provide a means
of remotely monitoring and controlling the Unit. Set-up screens
are provided for setting up the RS485 port. Refers to section 4.8.
Current THD% per each phase.
1.3 Pulse output
Two pulsed outputs that can be set for active (kWh) or reactive
(kVArh) energy.
3.2 Frequency and Power Factor and Demand
Each successive press of the
button selects a new range:
2 Start Up Screens
The first screen lights up all
display segments and can be used
as a display check.
Frequency and Power
Factor (total).
The second screen indicates the
firmware installed in the unit and
its build number.
Power Factor of each phase.
Please note: Values may vary from
the numbers shown here.
Maximum Current
Demand.
The interface performs a self-test
and indicates the result if the test
passes.
Maximum Power Demand.
*After a short delay, the screen will display active energy
measurements.
Caution: Risk of
Warnings Electric Shock
During normal operation, voltages hazardous to life
may be present at some of the terminals of this unit.
At voltages below that specified in the Range of Use
the meter may shut down. However, voltages
hazardous to life may still be present at some of the
terminals of this unit.
Installation and servicing should be performed only
by qualified, properly trained personnel abiding by
local regulations.
Ensure all supplies are de-energised before
attempting connection or other procedures.
Terminals should not be user accessible after
installation and external installation provisions must
be sufficient to prevent hazards under fault
conditions.
This unit is not intended to function as part of a
system providing the sole means of fault protection -
good engineering practice dictates that any critical
function be protected byat least two independent and
diverse means.
The unit does not have internal fuses therefore
external fuses must be used for protection andsafety
under fault conditions.
Never open-circuit the secondary winding of an
energized current transformer.
This product should only be operated with the CT
secondary connections earthed.
If this equipment is used in a manner not specified by
the manufacturer, protection provided by the
equipment may be impaired.
Tariff 1 active energy in kWh.
Total active energy in kWh.
Please note the register is 9999999.9 display over two lines.
Date and Time can only be set via Modbus
Tariff 2 active energy in kWh.
Total reactive energy in kVArh.
Tariff 1 reactive energy in kWh.
Tariff 2 reactive energy in kWh.

4 Set Up
There is a RS485 port can be used for communication using
Modbus RTU protocol. For Modbus RTU, parameters are
selected from Front panel.
Please note there are limitations that need to be factored inwhen
setting the pulsed output. This is based upon the relay output
only being able to pulse 2 times in onesecond.
Use
and
buttons to
To enter set-up mode, press the
the password screen appears.
button for 3 seconds, until
choose parity (EVEN /
ODD / NONE (default)).
Pulse settings: 1 pulse per 0.01(10W) / 0.1(100W) / 1 (1kWh)
/10(10kWh) / 100(100kWh) /1000 (1000kWh).
Setting up is password protected
so you must enter the correct
password (default ‘1000’) before
processing.
4.2.1 RS485 Address
DFT= Default. Set as 1 (1kWh)
From the set-up menu, use
On completion of the entry procedure, press
to confirm the
From the set-up menu, use
and
buttons to select the
setting and press
to return to the main set up menu.
If an incorrect password is
entered, the display will show:
PASS Err
address ID.
and
buttons to select the
Pulse Rate option.
4.2.4 Stop bits
Press
button to enter the
selection routine. The current
setting will be flashing.
From the set-up menu, use
Press
to enter the selection
routine. The current setting will
flash. 0.01/0.1/1/10/100kWh/
kVArh per pulse.
and
buttons to select the
stop bit option.
Once the correct password is entered, hold
enter the setup menu.
for 1 second to
Use
and
buttons to choose Modbus
address (001 to 247).
Press
to enter the selection
To exit the setup menu, press
measurement screen is restored.
repeatedly until the
Use
and
buttons to choose pulse rate. On
routine. The current setting will
flash.
completion of the entry procedure, press
to confirm the
4.1 Set-up Entry Methods
setting and press
to return to the main set up menu.
On completion of the entry procedure, press
button to
Some menu items, such as password and Modbus address,
require a four-digit number entry while others, such as supply
system, require selection from a number of menu options.
Use
and
4.3.2 Pulse Duration (DIT)
confirm the setting and press
up menu.
button to return the main set-
buttons to choose stop bit (2 or 1).
The energy monitored can be active or reactive and the pulse
width can be selected as 200, 100 or 60ms (Default).
CT ratio is not required. This product is directly connected.
4.2.2 Baud Rate
4.1.1 Menu Option Selection
On completion of the entry procedure, press
to confirm the
From the set-up menu, use
From the set-up menu, use
1. Use the
and
buttons to scroll through the different
options of the set up menu.
setting and press
to return to the main set up menu.
and
buttons to select the
and
buttons to select the
Pulse width option.
Baud Rate option.
2. Press
to confirm your selection.
4.3 Pulse Output
3. If an item flashes, then it can be adjusted by the
and
Press
to enter the selection
This option allows you to configure the pulse output. The output
can be set to provide a pulse for a defined amount of energy
active or reactive. Use this section to set up the relay pulse
output—Units: kWh, kVArh.
Press
to enter the selection
routine. The current setting will
flash.
routine. The current setting will
flash.
buttons.
4. Having selected an option from the current layer, press
to confirm your selection. The SET indicator will appear.
From the set-up menu, use
Use
and
buttons to
5. Having completed a parameter setting, press
to return to
Use
and
buttons to choose pulse width. On
choose Baud rate 2.4k. 4.8k, 9.6k,
19.2k, 38.4k
a higher menu level. The SET indicator will be removed and you
and
buttons to select the
completion of the entry procedure press
to confirm the
Pulse output option.
will be able to use the
selection.
and
buttons for further menu
setting and press
to return to the main set up menu.
Press
to enter the selection
6. On completion of all setting-up, press
the measurement screen is restored.
repeatedly until
4.4 Light Period (LP)
routine. The unit symbol will flash.
On completion of the entry procedure, press
to confirm the
The light period is a programmable time (in minutes) that
determines how long the display backlight remains on for before
this goes into standby.
setting and press
to return to the main set up menu.
4.1.2 Number Entry Procedure
4.2.3 Parity
When setting up the unit, some screens require the entering of a
number. In particular, on entry to the setting up section, a
password must be entered. Digits are set individually, from left to
right. The procedure is as follows:
Use
and
buttons to
From the set-up menu, use the
choose kWh or kVArh.
From the set-up menu, use
and
the reset option.
buttons to select
and
buttons to select the
1. The current digit to be set flashes and then can be adjusted
parity option.
using the
and
buttons.
On completion of the entry procedure, press
to confirm the
Press
to enter the selection
Press
to enter the selection
2. Press
to confirm each digit setting. The SET indicator
routine. The dIt will flash. The
options are 0/10/30/60/120
minutes.
setting and press
to return to the main set up menu.
routine. The current setting will
flash.
appears after the last digit has been set.
4.3.1 Pulse rate
3. After setting the last digit, press
to exit the number
setting routine. The SET indicator will be removed.
You can configure the pulse output to relate to a defined amount
of imported or exported energy. This can also be set to use with
active energy (kWh) or reactive energy (kVarh).
4.2 Communication
Press
to confirm the setting and press
to return to
the main set up menu.

4.5 Supply System
supplies).
•Percentage voltage THD% between phases
(three phase supplies only).
•Current 100A (Direct connected)
•Continuous Overload current 120%
•Current THD% for each phase.
•Burden <10VA (nom 2VA)
•Self powered from any phase
Use
and
to set the first
The unit has a default setting of 3Phase 4wire (3P4). Use this
section to set the type of electrical system.
digit and press
to confirm
your selection. The next digit will
flash.
Repeat the procedure for the
remaining three digits.
From the set-up menu, use
and
buttons to select the
system option.
5.1.2 Power factor and Frequency and Max. Demand
The screen will show the currently
selected power supply.
•Frequency in Hz
•Instantaneous power:
•Power 0 to 3600 MW
•Reactive power 0 to 3600MVAr
•Volt-amps 0 to 3600 MVA
•Maximum demanded power since lastDemand
reset Power factor
•Maximum neutral demand current, since thelast
Demand reset (for three phase suppliesonly)
After setting the last digit, SET will
show.
Press
to enter the selection
routine. The current selection will
flash.
Use
and
buttons to
Press
to exit the number setting routine and return to the
select the required system option:
1P2(W),3P3(W), 3P4(W).
Set-up menu. SET will be removed.
5.1.3 Energy Measurements
4.8 DIT Demand Integration Time
•Imported/Exported active
energy
•Imported/Exported
reactive energy
•Total active energy
•Total reactive energy
0 to 9999999.9 kWh
This sets the period in minutes over which the current and power
readings are integrated for maximum demand measurement.The
options are: off, 5, 10,15 30,60minutes.
Press
to confirm the
0 to 9999999.9 kVArh
selection. SET indicator will
appear.
0 to 9999999.9 kWh
0 to 9999999.9 kVArh
From the set-up menu, use
5.2 Measured Inputs
and
buttons to select the DIT
Press
to exit the system selection routine and return to the
Voltage inputs through 4-way fixed connector with 2.5mm²
stranded wire capacity. Single phase two wire(1p2w), three
phase three wire(3p3w) or three phase four wire(3p4w)
unbalanced. Line frequency measured from L1 voltage or L3
voltage.
option. The screen will show
menu. SET will disappear and you will be returned to the main
set-up Menu.
the currently selected integration
time.
4.6 CLR
Press
routine.
to enter the selection
The meter provides a function to reset the maximum demand
value of current and power.
5.3 Accuracy
The current time interval will flash.
•Voltage
•Current
•Frequency
•Power factor
•Active power (W)
•Reactive power (VAr)
•Apparent power (VA)
•Active energy (Wh)
•Reactive energy(VARh)
•Total harmonic
distortion
•Response time to
step input
0·5% of range maximum
0·5% of nominal
0·2% of mid-frequency
1% of unity (0.01)
±1% of range maximum
±1% of range maximum
±1% of range maximum
Class 1 IEC 62053-21
±1% of range maximum
1% up to 31st harmonic
From the set-up menu, use
Use
and
buttons to select the time required.
and
buttons to select the
reset option.
Press
to enter the selection
Press
to confirm the
routine. The dIt will flash.
selection. SET indicator will
appear.
1s, typical, to >99% of
final reading, at 50 Hz.
5.4 Interfaces for External Monitoring
Press
to confirm the setting and press
to return to
Press
menu.
to exit the DIT selection routine and return to the
the main set up menu.
Three interfaces are provided:
4.7 Change Password
•RS485 communication channel that canbe
programmed for Modbus RTU protocol
•Relay output indicating real-time measuredenergy.
(configurable)
•Pulse output 400imp/kWh (notconfigurable)
5 Specifications
5.1 Measured Parameters
Use the
and
to choose the change
password option.
The unit can monitor and display the following parameters of a
single phase two wire (1p2w), three phase three wire (3p3w) or
three phase four wire (3p4w) system.
The Modbus configuration (baud rate etc.) and the pulse relay
output assignments (kW/kVArh import/export etc.) are configured
through the set-up screens.
5.1.1 Voltage and Current
Press the
to enter the
change password routine. The
new password screen will appear
with the first digit flashing.
5.4.1 Pulse Output
•Phase to neutral voltages 100 to 289V a.c.
(not for 3p3w supplies).
•Voltages between phases 173 to 500V a.c.
(3p supplies only).
•Continuous Overload voltage 120%
•Percentage total voltage harmonicdistortion
(THD%) for each phase to N ( not for3p3w
Opto-coupler with potential free SPST-NO Contact
(Contact range 5-27VDC / Max current input: Imin 2mA and Imax
27mA DC). The pulse output can be set to generate pulses to
represent kWh or kVArh.
4.9 CT Ratio
The CT option sets the secondary current (CT2 1A or 5A) of the
current transformer (CT) that wires to the meter and the ratio to
the primary current.
From the set-up menu, use
and
buttons to select the
secondary CT menu.
Press
to enter the CT
Secondary value. 5A/1A
Press
to enter the CT Ratio
The range is 0001 to 9999.
The value is entered as a RATIO of the
primary and secondary current.
CT RATIO
For example, if using a 100/5A current transformer you would
enter 0020 on this screen.
4.10 PT Ratio
The PT option sets the secondary voltage (PT2 100 to 500V) of
the voltage transformer (PT) that wires to the meter.
From the set-up menu, use
and
buttons to select the secondary PT
menu. The default value is 400V
Press
to enter the PT
secondary voltage. The range is 100 to
500V L-L
Press
to enter the PT RATIO
RATIO.
The range is 0001 to 9999.
The value is entered as a RATIO of the
primary and secondary voltage.
PT RATIO
For example, if using a 8,000/400V voltage transformer you
would enter 0020 on this screen.

6.2 Input Wiring and Fusing
8.3 Three phase four wires
Choose fuses of a type and with a breaking capacity appropriate
to the supply and in accordance with local regulations.
7.2 Appearance
A switch or circuit breaker allowing isolation of supplies to the unit
must be provided where practical. In primary metering
applications, ensure the supply is isolated before any
maintenance on the product. Tampering with the product seals
may contravene local laws.
6.3 Wire Size
Voltage and current terminal blocks will accept 2.5mm² stranded
cable.
6.4 Maintenance
The front of the case should be wiped with a dry cloth only, using
minimal pressure. If necessary wipe the rear case with a dry
cloth.
No user serviceable parts.
8 Wiring Diagram
8.1 Single phase two wires
7 Meter
Explanation of Symbols
7.1 Dimensions
Refer to manual
Danger of electric shock
Do not discard
8.2 Three phase three wires
While TE has made every reasonable effort to ensure the accuracy of the information in this catalogue, TE
does not guarantee that it is error-free, nor does TE make any other representation, warranty or guarantee
that the information is accurate, correct, reliable or current. TE reserves the right to make any adjustments to
the information contained herein at any time without notice. TE expressly disclaims all implied warranties
regarding the information contained herein, including, but not limited to, any implied warranties of
merchantability or fitness for a particular purpose. The dimensions in this catalogue are for reference
purposes only and are subject to change without notice. Specifications are subject to change without notice.
Consult TE for the latest dimensions and design specifications. TE connectivity (logo), TE (logo) and TE
Connectivity are trademarks of the TE Connectivity Ltd. family of companies. Crompton is a trademark of
Crompton Parkinson and is used by TE Connectivity under a licence. Other logos, product and company names
mentioned herein may be trademarks of their respective owners
TE Energy –innovative and economical solutions for the electrical power industry: cable
accessories, connectors & fittings, insulators & insulation, surge arresters, switching
equipment, street lighting, power measurement and control.
Tyco Electronics UK Ltd
TE Energy
Freebournes Road
Witham, Essex CM8 3AH
Phone: [phone]
Fax: [phone]
Email: [e-mail]
www.crompton-instruments.com
Project 2305. Drawing No. CI-3L32301 Rev.2
10/12/19
Rate can be set to generate 1 pulse per:
0.01 = 10 Wh/VArh
0.1 = 100 Wh/VArh
1 = 1 kWh/kVArh
10 = 10 kWh/kVArh
100 = 100 kWh/kVArh
Pulse width 200/100/60 ms.
5.4.2 RS485 Output for Modbus RTU
For Modbus RTU, the following RS485 communication
parameters can be configured from the set-up menu:
Baud rate 2400, 4800, 9600, 19200, 38400
Parity none (default) / odd / even
Stop bits 1 or 2
RS485 network address nnn –3-digit number, 1 to 247
Modbus™ Word order Hi/Lo byte order is set automatically to
normal as defined by IEEE 754. It cannot be configured from the
set-up menu.
5.5 Reference Conditions of Influence Quantities
Influence Quantities are variables that affect measurement errors
to a minor degree. Accuracy is verified under nominal value
(within the specified tolerance) of these conditions.
•Ambient temperature
•Input waveform
•Input waveform
23°C ±1°C
50 or 60Hz ±2%
Sinusoidal (distortion
factor < 0·005)
factor < 0·05)
Terrestrial flux
(if AC)
•Magnetic field of
external origin
5.6 Environment
•Operating temperature
•Storage temperature
•Relative humidity
-25°C to +55°C*
-40°C to +70°C*
0 to 95%,
non-condensing
Up to 3000m
1 minute
10Hz to 50Hz, IEC
60068-2-6, 2g
30g in 3 planes
•Altitude
•Warm up time
•Vibration
•Shock
*Maximum operating and storage temperatures are in the context
of typical daily and seasonal variation.
5.7 Mechanics
•DIN rail dimensions
76 x 100 mm (WxH)
per DIN 43880
DIN rail (DIN 43880)
IP51 indoor
UL 94 V-0
Self-extinguishing
•Mounting
•Sealing
•Material
6 Installation and Maintenance
6.1 Installation notes
Units should be installed in a dry position, where the ambient
temperature is reasonably stable and will not be outside the
range -25 to +55⁰C.
Vibration should be kept to a minimum.
Preferably, mount the Integra so that the display contrast is not
reduced by direct sunlight or other high intensity lighting.
8.4 Additional Connections
5.4.3 Tariff Input
The energy can be measured for two tariffs. The tariff is
changed by applying 230v to terminals 2T.