Bender RCMB300 Series User manual

Quick-start guide
EN
RCMB300 series_D00372_01_Q_XXEN/06.2019
RCMB300 series
AC/DC sensitive residual current monitoring module

2 RCMB300 series_D00372_01_Q_XXEN/06.2019
RCMB300 series
i
Part of the device documentation in addition to this quick-start guide is the enclosed "Safety
instructions for Bender products" and the operating manual. This quick-start guide applies to the
following devices:
Type Supply voltage Response value/variant Order number
RCMB301 DC 24 V (19.2…28.8 V) 30 mA…3 A/Modbus RTU B74043100
Intended use
The residual current monitoring modules of the RCMB300 series are intended for measuring AC
and DC fault currents in earthed systems (TN and TT systems). The modules are able to measure
residual currents up to IΔ= 20 A in a frequency range of DC…100 kHz.
Any other use than that described in this document is regarded as improper. This quick-start
guide does not replace the operating manual of the device. Download: www.bender.de/manuals
Safety instruction
I DANGER of electrocution due to electric shock!
Touching live parts of the system carries the risk of:
- An electric shock
- Damage to the electrical installation
- Destruction of the device
Before installing and connecting the device, make sure that the installation has been de-ener-
gised. Observe the rules for working on electrical installations.
Dimension diagrams RCMB30... + CTBC... (all dimensions in mm, tolerance ±0.5 mm)
c
b
d
aType a b c d e f g
RCMB30…-CTBC20(P) 81 112 37 ø 20 46 60
RCMB30…-CTBC35(P) 97 130 47 ø 35 46 61
RCMB30…-CTBC60(P) 126 158 57 ø 60 56 78
RCMB30…-CTBC120(P) 188 232 96 ø 120 65 96 139
RCMB30…-CTBC210(P) 302 346 153 ø 210 67 113 277
RCMB30… 74 37 44 2 4.6
RCMB30…
RCMB30… + CTBC20(P)/CTBC35(P) RCMB30… + CTBC60(P) RCMB30… + CTBC120(P)/CTBC210(P)
d
b
f
c
ae
d
e
f
c
b
a
g
a
d
e
c
f
b

RCMB300 series
RCMB300 series_D00372_01_Q_XXEN/06.2019 3
Dimensions of mountings
a
b
c
a
b
c
a
b
c
Type a b c
CTBC20(P) 31.4 49 2 x ø 5.5
CTBC35(P) 49.8 49 2 x ø 5.5
CTBC60(P) 56 66 2 x ø 6.5
CTBC120(P) 103 81 4 x ø 6.5
CTBC210(P) 180 98 4 x ø 5.5
CTBC20(P)/CTBC35(P) CTBC60(P) CTBC120(P)/CTBC210(P)
Assembly
A complete residual current monitoring module consists of the RCMB30…evaluation electronics
and a CTBC20(P)…210(P) series measuring current transformer core. If ordered separately, these
two components must be plugged together and calibrated during commissioning.
Device view RCMB30…
21 22 2411 12 14
K1 K2
34789
125610
11 12
11 12
13 14
No. Terminal Meaning
124 V Supply voltage US
2 GND
3 D1 Contact feedback
4 DG
5 T/R Connection external test/reset
6 GND
7 A RS-485 interface
8 B
9 X1 Terminals for cable bridge for connection of the
integrated terminating resistor of the RS-485
interface
10 X2
11 11, 12, 14 Relay K1 (prewarning)
12 21, 22, 24 Relay K2 (alarm)
13 – LED: operation "ON" and "Alarm"
14 – Test and reset button "T"
Step 1: Place the electronic module on the mark on the
measuring current transformer.
Step 2: Fold the electronic module down onto the
measuring current transformer.
Step 3: Slide the electronic module onto the plug
contacts of the measuring current transformer.
3
1
2

4 RCMB300 series_D00372_01_Q_XXEN/06.2019
RCMB300 series
Connection
Refer to the manual for further connection options.
Commissioning - Modbus RTU
Address setting
i
Every RCMB3… has a factory-set Modbus address. The address is 1XX, where XX = the last two
digits of the serial number. Example: Serial number = 12345678 -> Modbus address = 178
The preset address can be changed via a COMTRAXX gateway, via Modbus or directly on the de-
vice.
The address can be changed on the device before installation and offset calibration. The electron-
ic module must not be connected to the measuring current transformer during address setting.
Each address in the bus system may only be assigned once.
i
The use of a type 2 surge protection de-
vice (SPD) is mandatory due to possible
impulse voltages and in order to comply
with normative requirements.
The surge protection device must be con-
nected upstream of the power supply
unit on the supply side.
Features of the surge protection device:
– Nominal discharge current In (8/20 μs): 20 kA
– Response time: 25 ns
– Two-stage: 1 varistor + 1 spark gab
– Alternatively, the power supply unit must be
connected to a CAT II supply without a surge
protection device.
F 6 A
L1
L2
L3
N
DC 24 V
AC
DC
21
GND
T/R
GND
24 V
L
N
22 24
21
22 24
11
12 14
3
RCMB301-CTBC...
SPD
i
Within an interconnection of devices via
the RS-485 interface, the first and the last
device must each be provided with a ter-
minating resistor.
This device-internal resistor can be con-
nected by means of a wire jumper or a
DIP switch.
X1 X2
120 Ω 120 Ω
Wire jumper
DIP switch
COM465IP
last device
RCMB30...
first device

RCMB300 series
RCMB300 series_D00372_01_Q_XXEN/06.2019 5
LED flashing modes
A
   slowly error
B
    medium mode change
C       quickly ready for address modification
D     very quickly address setting mode
E
 once confirmation
Address modification procedure
Phase Action LED
1Supply the electronic module with power Flashes red briey (A, error: no measuring
current transformer)
2Press and hold "T" until the LED ashes red very quickly; release
afterwards
Flashes red briey (A, error)
Flashes red at medium speed (B, mode
change)
Flashes red quickly (C, ready for address
setting mode)
3Set address (address setting range: 1…247) Flashes red quickly (D, address setting mode)
3a Units
place
Press "T" repeatedly until reaching the desired digit of the
units place Each keystroke is conrmed with green (E)
Acknowledge the entry: Press and hold "T" until the LED
ashes red; release afterwards
Lights green shortly (E)
LED ashes red briey (C)
3b Tens
place
Press "T" repeatedly until reaching the desired digit of the
tens place Each keystroke is conrmed with green (E)
Acknowledge the entry: Press and hold "T" until the LED
ashes red; release afterwards
Lights green shortly (E)
LED ashes red briey (C)
3c Hundreds
place
Press "T" repeatedly until reaching the desired digit of the
hundreds place Each keystroke is conrmed with green (E)
Acknowledge the entry: Press and hold "T" until the LED
ashes red; release afterwards
Lights green shortly (E)
LED ashes red briey (C)
4
Check address setting: LED indicates the address by ashing 1)
Digit units place Flashes green for each number (E)
Pause o
Digit tens place Flashes green for each number (E)
Pause o
Digit hundreds place Flashes green for each number (E)
Pause o
5Address set Flashes red briey (A, error: no measuring
current transformer)
1)Example for "Check address setting": flashing pattern after successful setting of address "124" :
E
EEA

6 RCMB300 series_D00372_01_Q_XXEN/06.2019
RCMB300 series
System state LED and output relays
The LED indicates the system state by means of colours and lighting/flashing. The changeover
contacts of the relay outputs K1 and K2 have defined switching positions for each system state.
System state GREEN LED
ON
RED LED
Alarm
Notes Relay K1 Relay K2
Device switched o o o Device is de-energised, no monitoring, no
monitoring function
de-energised de-energised
Normal operating state lights o The device is supplied with the specied
voltage and monitors the primary circuit.
No residual current ows which would
lead to tripping.
energised energised
Prewarning lights ashes
briey
The device is supplied with the specied
voltage and monitors the primary circuit.
A fault current ows which exceeds the
set limit of the prewarning.
de-energised energised
Alarm state o lights The device is supplied with the specied
voltage and monitors the primary circuit.
A fault current ows which exceeds the
set limit of the alarm.
de-energised de-energised
Device error o ashes
slowly
The device is supplied with the specied
voltage and monitors the primary circuit.
An error is detected by the periodic self
tests.
de-energised de-energised
Device in calibration
mode
see manual for DC calibration procedure de-energised de-energised
Device in address mode see manual for procedure
Device signalling Flash quickly in alter-
nation
Modbus register 20006 = 2
Use to detect the device in its environ-
ment faster. Is automatically deactivated
after one minute.

RCMB300 series
RCMB300 series_D00372_01_Q_XXEN/06.2019 7
Installation instructions measuring current transformer
i
Do not route any shielded cables through the measuring current transformer.
I CAUTION! Device damage due to high induction currents! High currents can be induced into
the conductor loop due to the AC/DC sensitive measuring technology used. Do not route pro-
tective conductors and low-resistance conductor loops through the measuring current trans-
former!
I CAUTION! Device damage due to interference pulses! The connecting cable (supply, analogue
interface ...) must not be routed directly past the current transformer core.
I CAUTION! Risk of injury due to accessible live conductors!
The measuring current transformer must be connected to the corresponding evaluator before
the first use and before commissioning of the monitored system.
Offset calibration and completion of the installation
Before commissioning the system, it is recommended that an offset calibration be carried out on
the RCMB module at the installation site. Note that during the offset calibration the system is
switched off and no current flows through the measuring current transformer. For the CTBC120
and CTBC210 measuring current transformer cores, an offset calibration is mandatory. The offset
calibration procedure is described in the manual.
The installation should be completed with a functional test: Press the "T" button for 1.5…5 s.
PE
L1
L2
L3
N
*
*
Never route an existing protective conductor through the measuring current trans-
All current-carrying cables must be routed together through the measuring current
transformer.
The primary conductors may only be bent from the specified minimum distance. The
minimum bending radius specified by the manufacturers must be observed. Distance
to 90° angle = 2 * external diameter
The cables must be centred in the measuring current transformer.

Alle Rechte vorbehalten.
Nachdruck und Vervielfältigung
nur mit Genehmigung des Herausgebers.
Bender GmbH & Co. KG
Postfach 1161 • 35301 Grünberg • Deutschland
Londorfer Str. 65 • 35305 Grünberg • Deutschland
Tel.: [phone] • Fax: [phone]
E-Mail: [email protected] • www.bender.de
All rights reserved.
Reprinting and duplicating
only with permission of the publisher.
Bender GmbH & Co. KG
P.O. Box 1161 • 35301 Grünberg • Germany
Londorfer Str. 65 • 35305 Grünberg • Germany
Tel.: [phone] • Fax: [phone]
E-mail: [email protected] • www.bender.de
RCMB300 series_D00372_01_Q_XXEN/06.2019 / pdf / © Bender GmbH & Co. KG, Germany – Subject to change! The specied standards take into account the edition valid until 06/2019 unless otherwise indicated.
Technical data
Rated voltage .................................................................... 800 V
Overvoltage category............................................................... III
Nominal supply voltage Us...............................................DC 24 V
Operating range US...........................................................±20 %
Power consumption........................................................≤ 2.5 W
Measuring circuit
Characteristics according to IEC 62020 and IEC/TR 60755
............................................................... AC/DC sensitive, type B
Measuring range..................................................... 5 mA…20 A
Response value IΔn ......................................................30 mA…3 A
Prewarning.....................................................50 %…100 % IΔn
Rated current In
CTBC20 when IΔn = 30 mA ....................................................40 A
CTBC20 when IΔn = 300 mA ..................................................63 A
CTBC20P................................................................................80 A
CTBC35 when IΔn = 30 mA ....................................................80 A
CTBC35 when IΔn = 300 mA ................................................125 A
CTBC35P..............................................................................160 A
CTBC60 when IΔn = 30 mA ..................................................160 A
CTBC60 when IΔn = 300 mA ................................................250 A
CTBC60P..............................................................................320 A
CTBC120 when IΔn = 100 mA ..............................................330 A
CTBC120P when IΔn = 100 mA ............................................630 A
CTBC210 when IΔn = 300 mA ..............................................630 A
CTBC210P when IΔn = 100 mA ............................................630 A
CTBC210P when IΔn = 300 mA ..........................................1000 A
Operating uncertainty ...................................................±17.5 %
Relative uncertainty ................................................... 0…-35 %
Outputs
Outputs.....................................................2 changeover contacts
Operating principle.................... N/C operation or N/O operation
Switching outputs (K1, K2) .........................................250 V, 5 A
Switching capacity..............................................1500 VA/144 W
Contact data acc. to IEC 60947-5-1
Rated operational voltage AC.................................. 250 V/250 V
Utilisation category ................................................ AC-13/AC-14
Rated operational current AC .......................................... 5 A/3 A
Rated operational voltage DC ............................... 220/110/24 V
Utilisation category..............................................................DC12
Rated operational current DC.....................................0.1/0.2/1 A
Minimum current............................................... 10 mA at DC 5 V
Ordering details
Suitable measuring current transformer cores
ø current
transformers
Type
Art. No.
20 mm
CTBC20
B98120001
CTBC20P
B98120002
35 mm
CTBC35
B98120003
CTBC35P
B98120004
60 mm
CTBC60
B98120005
CTBC60P
B98120006
120 mm
CTBC120
B98120007
CTBC120P
B98120020
210 mm
CTBC210
B98120008
CTBC210P
B98120021
System components
max. connected
current transformers Type Art. No.
4
STEP-PS/1 AC/24 DC/0.5
B94053110
14
STEP-PS/1 AC/24 DC/1.75
B94053111
34
STEP-PS/1 AC/24 DC/4.2
B94053112
Accessories
Type Art. No.
USB to RS-485 interface converter B95012045
Terminal set for RCMB module (spare part) B74043124