janitza RCM 202-AB User manual

RESIDUAL CURRENT MEASUREMENT DEVICE
RCM 202-AB
User manual
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany
2 RCM 202-AB
1 Information about using this user manual
1.1 General information
This user manual is intended exclusively for use by trained specialized electrotech-
nical personnel.
This user manual is a part of the product and makes reference to other devices from
Janitza electronics GmbH. Only the names of the respective device series are spec-
ified, but not all the associated types. Read this user manual before using the device.
Observe all safety requirements and warning notices. Failure to observe the instruc-
tions can lead to personal injury and/or damage to the product.
Keep the user manual through the entire service life of the product so it is available
for all users.
For this quick start, please also note further documentation on our homepage, such
as
- user manual and safety instructions
NOTE
Further information - e.g. the manual - can be found in the download area at
www.janitza.com.
RCM 202-AB 3
2 Safety instructions
2.1 Symbols used
WARNING
These symbols and the word “warning” are used when there is possible
danger to life and limb.
Symbols are also used in these instructions that refer directly to the source
of danger.
ATTENTION
This symbol and the word “attention” are used when there is the possibility
of property damage.
Observe the user manual!
This symbol and “Observe the user manual!” are used when reference must
be made to the user manual or other documentation.
NOTE
This symbols and the word “Note” are used to make reference to additional
information necessary for device use.
2.2 General safety instructions
The following safety instructions must be observed for work on and with the RCM
202-AB. Specific safety instructions are also listed in the respective chapters.
WARNING
All work necessary for the connection, assembly, commissioning and oper-
ation of the device may only be performed by well trained and instructed
specialist personnel. The specialist personnel must observe and comply
with the relevant applicable standards and directives for work on electrical
systems (e.g. DIN EN 50110 and ff./ directives and regulations of profes-
sional associations in Germany).
4 RCM 202-AB
ATTENTION
Use of the device requires sufficient knowledge of the product as well as
knowledge about the connected devices and systems. Changes to the pre-
set values and control commands influence the evaluation behavior of the
residual current measurement device. Therefore changes to the commis-
sioning settings as well as the replacement of devices may only be carried
out upon agreement with Janitza electronics GmbH!
Changes carried out are to be documented in the system documentation!
Observe the user manual!
This user manual as well as the device-specific user manuals for connected
devices must be strictly observed.
NOTE
The RCM 202-AB is supplied as a component of a residual and operating
current monitoring system. Upon commissioning/delivery of a monitoring
system, all system-specific settings and control commands for the RCM
202-AB shall be parameterized and documented by Janitza electronics
GmbH.
3 Purpose - Intended use
The RCM 202-AB is a two-channel residual current measurement device for the
measurement and monitoring of main distribution boards up to a maximum residual
current of 20 A.
With connected current measurement transformers (also current sensors), the RCM
202-AB is used for the measurement and monitoring of residual currents in TN and
TT systems (grounded AC systems).
With additional devices of the RCM series, display devices or devices for data cou-
pling to third-party systems, it forms a complete residual and operating current moni-
toring system. This monitoring system increases system and operational safety.
Faults or an increase in residual currents (usually creeping) are detected early on, for
example, thus allowing preventative maintenance. The external signal current circuits
used in the monitoring system shall be secondary current circuits.
Any use of the RCM 202-AB that differs from the description in this manual is consid-
ered improper use and may affect the protection provided by the device.
RCM 202-AB 5
4 Overview of the RCM 202-AB
4.1 Device view
Fig. 1: RCM 202-AB device view
1 Connection for 2 current measurement
transformers
2 Operating keys
3 Label with manufacturer, serial number
and item number
4 Supply voltage connection
5 Status LED
6 Display
7 Modbus termination switch
8 Modbus connection (RS485 interface)
9 Analog output connection (interface
4 … 20 mA)
10 Digital output connection
3
1
2
8 9 10
4
5
7
6
6 RCM 202-AB
4.2 Device dimensions
Fig. 2: Device dimensions in mm
5 Functions
5.1 Basic functionality
The main functions of the RCM 202-AB are:
Residual current measurement via a connected current measurement trans-
former (max. 2 current measurement transformers)
Transformer connection monitoring for wire breaks or short circuit per channel
Effective value measurement (true RMS)
Parallel measured value recording
Evaluation of fault currents (residual currents) type A and B according to IEC
62020
Detection of sinusoidal residual fault currents with frequencies up to 20 kHz
(type B+)
Measured value and extreme value storage with time stamp
Parameterizable alarm threshold for alarm message per channel
Parameterizable warning threshold (e.g. prewarning) for warning message per
channel
Parameterizable delay times:
Delay time for warning and alarm messages
Reset delay time for warning and alarm messages
RCM 202-AB 7
Operating and error messages shown on the display
Communication via Modbus (RS485 interface/Modbus RTU)
Evaluation possibility with the help of the GridVis
®
monitoring system or a dis-
play and evaluation device
5.1.1 Residual current monitoring principle
The fault currents (residual currents) flowing to ground or other paths are recorded
via the connected current measurement transformers.
For example:
Outflow-related residual currents (consumers and systems)
Stray currents in TN-S systems (PEN and N conductors)
ATTENTION
Do not route the PE conductor through the current measurement trans-
former!
Fig. 3: Simplified presentation of residual current measurement
8 RCM 202-AB
5.1.2 Current measurement transformer monitoring
The RCM 202-AB evaluates currents from up to two current measurement transform-
ers at the same time. For each active channel, the RCM 202-AB continuously checks
the connected transformer for short circuit or wire breaks. If a short circuit or wire
break occurs on the transformers, an error message is output on the display as well
as on the communication interfaces and the LED status flashes red.
5.2 RS485 interface (Modbus)
The RCM 202-AB has a Modbus interface (RS485) and works with the Modbus RTU
protocol as a slave. The device address 1 and the baud rate of 19200 baud are fac-
tory-set.
For more information, see the user manual at www.janitza.com
WARNING
The open ground connection of the RS485 interface may not be touched!
There is a risk of electric shock.
WARNING
The power supply connection and the transformer connections of the RCM
202-AB may be switched on only after connecting the ground terminal and
grounding the ground cable.
There is a risk of electric shock.
5.3 Digital outputs
ATTENTION
External signal current circuits must be secondary current circuits if the
RCM 202-AB is integrated in a monitoring system.
The digital outputs are not short-circuit proof.
Cables that are longer than 30 m must be installed shielded.
The RCM 202-AB has two transistor switching outputs. These digital outputs are elec-
trically isolated from the evaluation electronics via optocouplers.
The digital outputs switch direct current or alternating current loads.
The digital outputs switch loads independently of the polarity of the supply volt-
age.
8 RCM 202-AB
5.1.2 Current measurement transformer monitoring
The RCM 202-AB evaluates currents from up to two current measurement transform-
ers at the same time. For each active channel, the RCM 202-AB continuously checks
the connected transformer for short circuit or wire breaks. If a short circuit or wire
break occurs on the transformers, an error message is output on the display as well
as on the communication interfaces and the LED status flashes red.
5.2 RS485 interface (Modbus)
The RCM 202-AB has a Modbus interface (RS485) and works with the Modbus RTU
protocol as a slave. The device address 1 and the baud rate of 19200 baud are fac-
tory-set.
For more information, see the user manual at www.janitza.com
WARNING
The open ground connection of the RS485 interface may not be touched!
There is a risk of electric shock.
WARNING
The power supply connection and the transformer connections of the RCM
202-AB may be switched on only after connecting the ground terminal and
grounding the ground cable.
There is a risk of electric shock.
5.3 Digital outputs
ATTENTION
External signal current circuits must be secondary current circuits if the
RCM 202-AB is integrated in a monitoring system.
The digital outputs are not short-circuit proof.
Cables that are longer than 30 m must be installed shielded.
The RCM 202-AB has two transistor switching outputs. These digital outputs are elec-
trically isolated from the evaluation electronics via optocouplers.
The digital outputs switch direct current or alternating current loads.
The digital outputs switch loads independently of the polarity of the supply volt-
age.
RCM 202-AB 9
5.4 Analog outputs (interfaces 4 … 20 mA)
The RCM 202-AB has two analogue outputs (interfaces 4 … 20 mA). The analogue
outputs output the effective value of the measured total current. Both analogue out-
puts require a separate power supply (DC 12 … 24 V).
Further information can be found in the user manual at www.janitza.de
6 Connection assignment
Fig. 4: Circuit diagram of the RCM 202-AB
10 RCM 202-AB
Modbus (RS485 interface)
Pin Desig-
nation
Meaning
1 B+ D
+
/non-inverted signal
2 A– D
–
/inverted signal
3 Reference potential (GND)
Analog and digital output connection
1 AO1+ Analog output 1 (4 … 20 mA sink +)
2 AO1– Analog output 1 (4 … 20 mA sink -)
3 AO2+ Analog output 2 (4 … 20 mA sink +)
4 AO2– Analog output 2 (4 … 20 mA sink -)
5 - -
6 1 Common connection for both digital outputs
7 2 Digital output 1
8 3 Digital output 2
Current measurement transformer connection
1 I1 – K Current measurement transformer 1, contact k (wire color
1)
: white)
2 I1 – L Current measurement transformer 1, contact l (wire color
1)
:
brown)
3 I2 – K Current measurement transformer 2, contact k (wire color
1)
: white)
4 I2 – L Current measurement transformer 2, contact l (wire color
1)
:
brown)
Power supply connection
1 N Supply voltage AC 90 ... 230 V (N)
2 L Supply voltage AC 90 ... 230 V (L)
Tab. 1: Connection assignment RCM 202-AB
Bus termination
TERM switch Switch position Resistance
On (first and last bus
participant)
RH Resistance (120 Ω) switched on
Off Left No resistance
Tab. 2: Bus termination via the TERM switch
1)
for transformers with fixed connection cables without contacts k and l
RCM 202-AB 11
7 Application example
7.1 Application example RCM 202-AB in stand-alone mode
Fig. 5: Connection of two relays to the digital outputs
7.2 Application example analog outputs (interface 4 … 20 mA)
Fig. 6: Connection of a display device and a PLC to the analog outputs
(Power supply: Janitza power supply unit, art. no. 16.05.012)
Art no.: 33.03.388 Doc. no.: 2.002.145.0.e 09/2020
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau, Germany

12 RCM 202-AB
7.3 Application example analog outputs and UMG 96RM-E
Fig. 7b: Connection to the analogue outputs of a UMG 96RM-E
The analogue outputs (AO1/AO2) may only be operated on galvanically isolated
inputs/devices. Use a maximum of ONE analogue measurement circuit per meas-
urement device (e.g. UMG 96RM-E) for the RCM 202-AB. Using TWO analogue
channels between the RCM 202-AB and a device without galvanically isolated in-
puts leads to measurement errors (cf. Fig. 10c)!
Fig. 8c: Invalid connection scheme
Janitza power supply unit (art. no. 16.05.012) required!
RCM 202-AB 13
7.4 Application examples via Modbus (RS485 interface)
Fig. 9: Application example – PLC
Fig. 10: Application example – Measurement devices
Fig. 11: Application example – Modbus TCP
Fig. 12:
Application example RS232/RS485
14 RCM 202-AB
8 Assembly, commissioning and configuration
ATTENTION
Assembly, connection and commissioning may only take place through
qualified electrical personnel in compliance with the existing safety regula-
tions and standards.
A line circuit breaker must be installed for the power supply of the
RCM 202-AB. After commissioning, the connectors of the device must be
protected against accidental contact by a cover if it is not ensured that only
qualified personnel have access to the device.
NOTE
Site information (e.g.: device designations), the installation in the Modbus
segment, the serial number, the Modbus address (device address) as well
as the designation of the current measurement transformer must be noted
in the system documentation or taken from the supplied system documen-
tation.
8.1 Assembly (initial installation)
The RCM 202-AB is installed in distribution boards and switchgears on a top hat rail
(35 mm) according to DIN EN 60715.
Requirements: The current measurement transformers are already installed on
the cables to be monitored.
Visually check the RCM 202-AB for damage.
Snap the RCM 202-AB onto the top hat rail.
Check the RCM 202-AB for tight fit.
RCM 202-AB 15
Connect the plug of the RS485 interface to RCM 202-AB. Connect the ground
connection of the RS485 interface with the protective conductor PE.
NOTE
The device address 1 and the baud rate of 19200 baud are factory-set.
If the RCM 202-AB is the first or last device in the Modbus line, the termina-
tion resistor must be set.
The ground terminals of all RS485 connections of multiple RCM 202-AB
must be connected with the ground wire of the cable. The ground wire must
be grounded in one point. The second wire pair of the bus cable is used as
the ground wire. Both wires of the pair are parallel connected.
The shield may be applied only on one side!
Terminate the first and last bus participants within a bus segment by pushing
the “Term” switch to the right.
NOTE
In the case of a RS485 connection from a control cabinet to a control cabi-
net, the Modbus connections B+ and A- must be electrically isolated.
Connect the current measurement transformer to the plug of the respective
current measurement input (I1 and I2). When doing so, observe the connec-
tions K and L (see also Tab. 1 on page 10).
Connect the analog and digital outputs if necessary.
Make sure that the connected connectors are still firmly seated.
Retighten all screw connections.
8.2 Commissioning
NOTE
The housing of the RCM 202-AB warms up during operation.
Connect the plug for the power supply to the N/L connection. The status LED
flashes green. RCM 202-AB initialization takes place. “I1 = ---” and “I2 = ---”
appear on the display.
Wait until initialization is completed. Initialization can take up to 60 seconds.
Initialization will take longer if the transformer measures residual currents
already during initialization.
The status LED lights up green and the measured values for the activated
measurement channels are shown on the display. The RCM 202-AB is
ready for operation.
16 RCM 202-AB
If necessary, configure the RCM 202-AB (see chapter Fehler! Verweisquelle
konnte nicht gefunden werden.) according to the system to be monitored
and depending on the circuit of its connections.
Observe the user manual!
The system documentation must be observed for the parameterization of
the RCM 202-AB.
9 Technical data
9.1 General technical data
Operating data
Supply voltage USAC 90 … 230 V, 50/60 Hz
Required external back-up fuse for the
power supply
Circuit breaker 1 pole, 3 A,
AC 230 V
Operating mode Continuous operation
Power consumption (internal consumption) 8 W
Isolation coordination according to IEC 60664-1
Rated current lb 4 kA
Rated surge voltage 4 kV
Pollution degree 2
Rated voltage AC 250 V, 50 … 60 Hz
Monitored system
Measurement transformer types/transformation ratio:
Residual current measuring transducer See Tab. 3 on page 19
Current measurement transformer rated
voltage
AC 20 ... 720 V
Current measurement transformer rated fre-
quency
0 ... 20 kHz
Current measurement transformer rated
current
(depending on the type)
Measurement channels
Number of measuring channels 2 (connectable current measurement
transformers)
Measured value recording Parallel, effective value measurement
(true RMS)
Evaluation Residual currents
RCM 202-AB 17
Type A and B according to IEC 62020
Measurement response residual current I Δn Parameterizable, 30 mA ... 20 A
Response delay time of the
warning and alarm messages t
v
Parameterizable, 10 ms ... 10 s
Reset delay time t vr Parameterizable, 10 ms ... 10 s
Transformer connections
Connection to the current measurement
transformers
Line resistance max. 2 Ω
Line/transformer 2-wire
Line length:
Single wires (0.75 to 1.5 mm²) max. 1 m
Twisted single wires (0.75 to 1.5 mm²) max. 10 m
Shielded cable (0.75 to 1.5 mm²) max. 10 m
Displays, messages and memory
Full graphics display (LCD) 128 x 64 pixel with backlight
Status LED 3-color
Controls 3 keys
Menu languages German, English, Spanish
Date and time With RTC, stored in the non-volatile
memory
Parameterization On RCM 202-AB in the configuration
menu
Messages Display, LED, Modbus, digital outputs
Measured value memory 18,725 datasets (circular buffer)
With date and time
Examples:
Shielded cable 0.75 mm2(shield on I) Max. length 20 m (21.87 yd)
Cable type J-Y(ST)Y Ø 0.6 mm Max. length 15 m (16.4 yd)
Analog outputs
Interface 4 … 20 mA
Quantity 2
Supply voltage of the analog outputs DC 12 … 24 V
Digital outputs
Number of digital outputs 2
Switching voltage max. DC 60 V, AC 30 V
Maximum current 350 mA
Start-up resistance 2 Ω
18 RCM 202-AB
Maximum cable length up to 30 m (32.8 yd) unshielded,
above 30 m (32.8 yd) shielded
RS485 interface
Protocol Modbus RTU (RCM 202-AB as the slave)
Interface RS485
Baud rate Parameterizable, 9.6 … 115.2 kbaud
Address range 1 … 247
max. cable length (38.4 kbaud) 1200 m (1212.3 yd)
Cable (shielded, shield one-sided on PE) Unitronic Li2YCY(TP) 2x2x0.22 (Lapp ca-
ble)
Termination resistor 120 Ω (can be activated on the device)
Device safety
Safety regulations for electrical measurement, control, regulation and laboratory devices
Part 1: General requirements IEC/EN 61010-1
Part 2-030: Particular requirements for
equipment having testing or measuring cir-
cuits
IEC/EN 61010-2-030
Electromagnetic compatibility (EMC)
Immunity from interference
Class A: Industrial sector IEC/EN 61326-1
Electrostatic discharges IEC/EN 61000-4-2
Voltage dips IEC/EN 61000-4-11
Emissions
Class B: Residential sector IEC/EN 61326-1
RFI field strength 30 ... 1000 MHz IEC/CISPR11/EN 55011
Radiated interference voltage 0.15 ... 30
MHz
IEC/CISPR11/EN 55011
Standards
The RCM 202-AB fulfills the requirements according to
EN 62020:1998+A1:2005 (VDE 0663):2005
Ambient conditions
Ambient temperature during operation -5 ... +55°C (23°F…131°F)
Ambient temperature during storage -25 ... +70°C (-13°F…158°F)
Ambient temperature during transport -25 ... +70°C (-13°F…158°F)
Altitude 0 … 2000 m (0 …1.24 mi)
Climate category according to
IEC 60721-3-3 (operation)
3K5
RCM 202-AB 19
Installation conditions
Installation position Horizontal/vertical
Assembly Top hat rail per DIN EN 60715
Device dimensions in mm (H x W x D) 71 x 90 x 73
Protection class according to EN 60529 IP 20
Protection class II
Flammability rating UL94V-0
Weight Approx. 170 g (0.375 lb)
Connection type/cable Series terminal/copper
Connection cross section single-wire/finely
stranded
0.2 ... 4 mm2/0.2 ... 1.5 mm2(AWG 24-15)
The following current measurement transformers can be connected to the RCM
202-AB:
Transformer type Inner win-
dow mm
Sepa-
rable
Transformation
ratio
Max. primary cur-
rent
mA
DACT20 20 - 600:1 18000
CT-AC RCM 35N 35 - 700:1 20000
CT-AC RCM 80N 80 - 700:1 20000
CT-AC RCM 110N 110 - 700:1 20000
CT-AC RCM 140N 140 - 700:1 20000
CT-AC RCM 210N 210 - 700:1 20000
CT-AC RCM
A110N
110 • 700:1 20000
CT-AC RCM
A150N
150 • 700:1 20000
CT-AC RCM
A310N
310 • 700:1 20000
KBU 23D 20 x 30 • 600:1 18000
KBU 58D 50 x 80 • 600:1 18000
KBU 812D 80 x 120 • 600:1 18000
Tab. 3: Current measurement transformer for RCM 202-AB
2 RCM 202-AB
1 Information about using this user manual
1.1 General information
This user manual is intended exclusively for use by trained specialized electrotech-
nical personnel.
This user manual is a part of the product and makes reference to other devices from
Janitza electronics GmbH. Only the names of the respective device series are spec-
ified, but not all the associated types. Read this user manual before using the device.
Observe all safety requirements and warning notices. Failure to observe the instruc-
tions can lead to personal injury and/or damage to the product.
Keep the user manual through the entire service life of the product so it is available
for all users.
For this quick start, please also note further documentation on our homepage, such
as
- user manual and safety instructions
NOTE
Further information - e.g. the manual - can be found in the download area at
www.janitza.com.
Janitza electronics GmbH
Vor dem Polstück 6 • 35633 Lahnau, Germany
Support Tel. [phone] • E-Mail: [email protected] • www.janitza.de
RCM 202-AB 15
Connect the plug of the RS485 interface to RCM 202-AB. Connect the ground
connection of the RS485 interface with the protective conductor PE.
NOTE
The device address 1 and the baud rate of 19200 baud are factory-set.
If the RCM 202-AB is the first or last device in the Modbus line, the termina-
tion resistor must be set.
The ground terminals of all RS485 connections of multiple RCM 202-AB
must be connected with the ground wire of the cable. The ground wire must
be grounded in one point. The second wire pair of the bus cable is used as
the ground wire. Both wires of the pair are parallel connected.
The shield may be applied only on one side!
Terminate the first and last bus participants within a bus segment by pushing
the “Term” switch to the right.
NOTE
In the case of a RS485 connection from a control cabinet to a control cabi-
net, the Modbus connections B+ and A- must be electrically isolated.
Connect the current measurement transformer to the plug of the respective
current measurement input (I1 and I2). When doing so, observe the connec-
tions K and L (see also Tab. 1 on page 10).
Connect the analog and digital outputs if necessary.
Make sure that the connected connectors are still firmly seated.
Retighten all screw connections.
8.2 Commissioning
NOTE
The housing of the RCM 202-AB warms up during operation.
Connect the plug for the power supply to the N/L connection. The status LED
flashes green. RCM 202-AB initialization takes place. “I1 = ---” and “I2 = ---”
appear on the display.
Wait until initialization is completed. Initialization can take up to 60 seconds.
Initialization will take longer if the transformer measures residual currents
already during initialization.
The status LED lights up green and the measured values for the activated
measurement channels are shown on the display. The RCM 202-AB is
ready for operation.