Bender RCMB330 User manual

Manual
EN
RCMB330
AC/DC sensitive residual current monitoring module
with integrated measuring current transformer
RCMB330_D00389_00_M_XXEN/12.2020 Manual EN

Bender GmbH & Co. KG
PO Box 1161 • 35301 Grünberg • Germany
Londorfer Str. 65 • 35305 Grünberg • Germany
Tel.: [phone] • Fax: [phone]
email: [e-mail] • www.bender.de
©Bender GmbH & Co. KG
All rights reserved.
Reprinting and duplicating
only with permission of the publisher.
Photos: Bender Archive

3
Table of Contents
RCMB330_D00389_00_M_XXEN/12.2020
1. General instructions ............................................................................... 5
1.1 How to use this manual .................................................................................. 5
1.2 Technical support: service and support .................................................... 5
1.3 Training courses ................................................................................................. 6
1.4 Delivery conditions ........................................................................................... 7
1.5 Inspection, transport and storage ............................................................... 7
1.6 Warranty and liability ....................................................................................... 7
1.7 Disposal ................................................................................................................. 8
2. Safety instructions .................................................................................. 9
2.1 General safety instructions ............................................................................ 9
2.2 Working on electrical installations .............................................................. 9
2.3 Intended use ....................................................................................................... 9
3. Device description ............................................................................... 10
3.1 Area of application .......................................................................................... 10
3.2 Device features ................................................................................................. 10
3.3 Functional description ................................................................................... 11
4. Mounting and connection ............................................................ 12
4.1 Dimension diagram ........................................................................................ 12
4.2 Mounting options ........................................................................................... 13
4.2.1 DIN rail mounting ............................................................................................ 13
4.2.2 Screw mounting .............................................................................................. 13
4.3 Connecting the device .................................................................................. 13
4.3.1 Device view RCMB330 ................................................................................... 14
4.3.2 Wiring diagram ................................................................................................. 14
4.4 Installation instructions for measuring current transformers ......... 16
5. Commissioning ..................................................................................... 17
5.1 Address setting ................................................................................................ 17
5.2 Offset calibration ............................................................................................. 18
5.3 Completing and checking installation .................................................... 18

Table of Contents
4RCMB330_D00389_00_M_XXEN/12.2020
5.4 Test and reset .................................................................................................... 19
5.4.1 Periodic self test ............................................................................................... 19
5.4.2 Manual test/reset ............................................................................................. 19
5.4.3 Offset calibration ............................................................................................. 19
5.4.4 Testing measuring channels ....................................................................... 19
6. LED ........................................................................................................... 20
7. Modbus registers .................................................................................. 21
7.1 General overview ............................................................................................. 21
7.1.1 Read and write accesses ............................................................................... 21
7.1.2 Formats used ..................................................................................................... 21
7.1.3 Overview of the register areas .................................................................... 22
7.1.4 Representation of values .............................................................................. 22
7.1.5 Alarm assignments ........................................................................................ 23
7.1.6 Descriptions ....................................................................................................... 23
7.2 Device information ......................................................................................... 23
7.3 Detailed measured values ............................................................................ 25
7.4 Basic measured values ................................................................................... 26
7.5 History .................................................................................................................. 28
7.6 Device parameters and factory settings ................................................. 29
7.7 Control commands ......................................................................................... 32
7.8 Additional function codes ............................................................................ 34
7.8.1 Diagnostic (function code 0x08) ................................................................ 34
7.8.2 Get Com Event Counter (function code 0x0B) ...................................... 34
7.8.3 Report Server ID (function code 0x11) ..................................................... 35
7.8.4 Device Identification (function code 0x2B) ............................................ 35
8. Frequency responses ........................................................................... 36
8.1 Low passes LP ................................................................................................... 36
8.2 Type B+ ............................................................................................................... 36
8.3 Type B .................................................................................................................. 37
8.4 Fire protection 100 kHz ................................................................................. 37
9. Technical data ....................................................................................... 38
9.1 Tabular data ....................................................................................................... 38
9.2 Standards and certifications ........................................................................ 40
9.3 Ordering information ..................................................................................... 40
9.4 Document revision history ........................................................................... 41
INDEX ............................................................................................................ 43

General instructions
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RCMB330_D00389_00_M_XXEN/12.2020
1. General instructions
1.1 How to use this manual
Always keep this manual within easy reach for future reference. We have used the fol-
lowing symbols to identify important instructions and information:
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers:
First level support
Technical support by phone or e-mail for all Bender products
•Questions about specific customer applications
•Commissioning
•Troubleshooting
Telephone: [phone]*
Fax: [phone]:-259 Germany: 0700BenderHelp (telephone and fax)
E-mail: [e-mail]
This manual is intended for qualified personnel working in electrical
engineering and electronics!
This signal word indicates that there is a high risk of danger that will
result in death or serious injury if not avoided.
This signal word indicates a medium risk of danger that can lead to
death or serious injury, if not avoided.
This signal word indicates a low-level risk that can result in minor or
moderate injury or damage to property if not avoided.
This symbol denotes information intended to assist the user in making
optimum use of the product.
DANGER
WARNING
CAUTION

General instructions
6RCMB330_D00389_00_M_XXEN/12.2020
Repair service
Repair, calibration, update and replacement service for all Bender products
•Repair, calibration, testing and analysis
•Hardware and software update
•Delivery of replacement devices for faulty or incorrectly delivered devices
•Extended warranty with in-house repair service or replacement device at no extra
cost
Telephone: [phone]** (technical issues)/
[phone]**, -785** (commercial issues)
Fax: [phone]
E-mail: [email protected]
Please send the devices for repair to the following address:
Bender GmbH, Repair-Service, Londorfer Straße 65, 35305 Grünberg
Field service
On-site service for all Bender products
•Commissioning, parameter setting, maintenance, troubleshooting
•Analysis of the electrical installation in the building (power quality test, EMC test,
thermography)
•Practical training courses for customers
Telephone: [phone]**, -762 ** (technical issues)/
[phone]** (commercial issues)
Fax: [phone]
E-mail: [e-mail]
Internet: www.bender.de
*Available from 7.00 a.m. to 8.00 p.m. on 365 days of the year (CET/UTC +1)
**Mo-Thu 7.00 a.m. - 4.00 p.m., Fr 7.00 a.m. - 1.00 p.m
1.3 Training courses
Bender is happy to provide training regarding the use of test equipment.
The dates of training courses and workshops can be found on the Internet at
www.bender.de -> Know-how -> Seminars.

General instructions
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RCMB330_D00389_00_M_XXEN/12.2020
1.4 Delivery conditions
The conditions of sale and delivery set out by Bender apply.
For software products, the "Softwareklausel zur Überlassung von Standard- Software
als Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen Lieferbedingun-
gen für Erzeugnisse und Leistungen der Elektroindustrie" (software clause in respect of
the licensing of standard software as part of deliveries, modifications and changes to
general delivery conditions for products and services in the electrical industry) set out
by the ZVEI (Zentralverband Elektrotechnik- und Elektronikindustrie e.V., (German Elec-
trical and Electronic Manufacturers' Association) also applies.
Conditions of sale and delivery can be obtained from Bender in printed or electronic for-
mat.
1.5 Inspection, transport and storage
Inspect the dispatch and equipment packaging for damage, and compare the contents
of the package with the delivery documents. In the event of damage in transit, please
contact Bender immediately.
The devices must only be stored in areas where it is protected from dust, humidity and
spray or dripping water, and in which the specified storage temperatures can be as-
sured.
1.6 Warranty and liability
Warranty and liability claims in the event of injury to persons or damage to property are
excluded if they can be attributed to one or more of the following causes:
•Improper use of the device.
•Incorrect mounting, commissioning, operation and maintenance of the device.
•Failure to observe the instructions in this operating manual regarding transport,
commissioning, operation and maintenance of the device.
•Unauthorised changes to the device made by parties other than the manufacturer.
•Non-observance of technical data.
•Repairs carried out incorrectly and the use of replacement parts or accessories not
approved by the manufacturer.
•Catastrophes caused by external influences and force majeure.
•Mounting and installation with device combinations not recommended by the
manufacturer.

General instructions
8RCMB330_D00389_00_M_XXEN/12.2020
This operating manual, especially the safety instructions, must be observed by all per-
sonnel working on the device. Furthermore, the rules and regulations that apply for ac-
cident prevention at the place of use must be observed.
1.7 Disposal
Abide by the national regulations and laws governing the disposal of this device. Ask
your supplier if you are not sure how to dispose of the old equipment.
The directive on waste electrical and electronic equipment (WEEE directive) and the di-
rective on the restriction of certain hazardous substances in electrical and electronic
equipment (RoHS directive) apply in the European Community. In Germany, these pol-
icies are implemented through the "Electrical and Electronic Equipment Act" (ElektroG).
According to this, the following applies:
•Electric and electronic equipment are not to be included in household waste.
•Batteries and accumulators are not to be included in household waste but must be
disposed of in accordance with the regulations.
•Old electrical and electronic equipment from users other than private households
which was introduced to the market after 13 August 2005 must be taken back by
the manufacturer and disposed of properly.
For more information on the disposal of Bender devices, refer to our website at
www.bender.de -> Service & support.

Safety instructions
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RCMB330_D00389_00_M_XXEN/12.2020
2. Safety instructions
2.1 General safety instructions
Part of the device documentation in addition to this manual is the enclosed " Safety in-
structions for Bender products".
2.2 Working on electrical installations
If the device is used outside the Federal Republic of Germany, the applicable local
standards and regulations must be complied with. The European standard EN 50110
can be used as a guide.
2.3 Intended use
The RCMB330 residual current monitoring modules are intended for AC/DC sensitive re-
sidual current measurement. The area of application is the monitoring of residual cur-
rents IΔfor preventive maintenance in TN, TT and IT system up to 300 V with IΔ≤ 500 A
rms, whereby IΔis intended to be measured within the range f= 0…100 kHz.
The devices are intended for operation in control cabinets or similarly protected envi-
ronments.
Any other use than that described in this manual is regarded as improper.
Only qualified personnel working in electrical engineering and
electronics are permitted to carry out the work necessary to install,
commission and run a device or system.
Risk of fatal injury 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-energised. Observe the rules for working on
electrical installations.
Refer to the rated and supply voltage values as specified in the techni-
cal data!
DANGER

Device description
10 RCMB330_D00389_00_M_XXEN/12.2020
3. Device description
3.1 Area of application
The RCMB330 residual current monitoring modules are intended for measuring AC and
DC fault currents in earthed systems (TN and TT systems). The modules are able to
measure residual currents IΔ= 10…500 mA in a frequency range of DC…100 kHz.
Two separately adjustable response values allow a distinction to be made between pre-
warning and main alarm.
The modules feature an RS-485 interface with Modbus RTU which can be used to trans-
fer measured values and alarm values. Setting parameters is also possible via this inter-
face.
3.2 Device features
•Continuous residual current monitoring in compliance with DGUV Vorschrift 3
(German Accident Prevention Regulation 3)
•Easy DIN rail or screw mounting
•RS-485 interface with Modbus RTU (reading out measured values/setting param-
eters)
•Frequency range DC…100 kHz
•Multicolour LED for operation and status messages
•Digitally adjustable filters for AC/DC sensitive measured value acquisition (low-
pass filters, type B acc. to IEC 60755, type B+ acc. to VDE 0664-400)
•Separate evaluation of the AC and DC components as well as the RMS value of
the residual current possible
•Installation without mechanical separation of the primary conductors
•Extension or modification of functionalities through software updates via Mod-
bus
•Insensitive to load currents due to magnetic screen
•Supply voltage DC 24 V

Device description
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RCMB330_D00389_00_M_XXEN/12.2020
3.3 Functional description
Residual current IΔn
The residual current monitoring module measures both AC and DC currents. The mes-
sage is transmitted via Modbus based on the determined RMS value. If the set residual
operating current IΔn (main alarm) is exceeded, the LED lights red.
The individual components of the residual current (AC component, DC component)
and the RMS value can be evaluated separately with the RCMB module. In addition, it is
possible to set the main alarm and prewarning for individual components.
If storing behaviour is enabled (prewarning register 16055, main alarm register 16073),
the message must be deleted on the device or via Modbus (register 20001).
Offset calibration
When the device has been installed, an offset calibration should first be performed (Re-
fer to "Offset calibration" on page 18.).
Test measuring channels
A test of the measuring channels can be started via Modbus. Simulated measured val-
ues/messages are output via Modbus (register 20010).
Test
A device test can be performed on the device or via Modbus (register 20000).
Reset
A reset can be performed on the device or via Modbus to delete the stored messages
(register 20001).
RS-485 interface
The RS-485 interface uses the Modbus RTU protocol to
•read out measured values
•set device parameters
•test
•reset
•perform software updates (in preparation)

Mounting and connection
12 RCMB330_D00389_00_M_XXEN/12.2020
4. Mounting and connection
4.1 Dimension diagram
Fig. 4.1: Dimension diagram RCMB330
all dimensions in mm, tolerance ±0.5 mm
Only qualified personnel working in electrical engineering and
electronics are permitted to carry out the work necessary to install,
commission and run a device or system.
Risk of fatal injury 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-energised. Observe the rules for working on
electrical installations.
Refer to the rated and supply voltage values as specified in the
technical data!
Risk of fatal injury due to electric shock!
If the Modbus RTU system is supplied from several power supply units,
impermissibly high touch currents may occur.
Use only one power supply unit in the Modbus RTU system.
DANGER
DANGER
T/R
Bender
65,5 25
100,4
25

Mounting and connection
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RCMB330_D00389_00_M_XXEN/12.2020
4.2 Mounting options
4.2.1 DIN rail mounting
4.2.2 Screw mounting
The device can also be screwed on using
the supplied adapter. For this purpose, the
adapter is inserted into the mounting
groove on the bottom of the RCMB330
and fixed with the mounting clip.
4.3 Connecting the device
Risk of fatal injury 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-energised. Observe the rules for working on
electrical installations.
Refer to the rated and supply voltage values as specified in the
technical data!
1.
2.
4.
„Klick“
3.
RCMB330
DANGER

Mounting and connection
14 RCMB330_D00389_00_M_XXEN/12.2020
4.3.1 Device view RCMB330
Tab. 4.1: Device view RCMB330
4.3.2 Wiring diagram
*)
No
.Element Description
1
Unlock cur-
rent trans-
former core
Press both elements together simultane-
ously and flip the RCMB330 open
2"T/R" button
For manual test, manual reset, degaussing,
offset calibration
(use pointed object to press)
3LED Combined LED (Refer to "LED" on page 20.)
4
Terminal block
Termi-
nal Pin no. Termi-
nal Description
X1 56 X2
Terminals for jumper to
connect the integrated ter-
minating resistor (120 Ω) of
the RS-485 interface
B47 BRS-485 interface
A38 A
GND 29GND Supply voltage US
+24 V 110+24 V
The use of a type 2 surge protection device (SPD) is mandatory due to
possible impulse voltages and in order to comply with normative
requirements. The surge protection device must be connected 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 can be connected to a CAT II supply
without a surge protection device.
T/R
2
1
4
3

Mounting and connection
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RCMB330_D00389_00_M_XXEN/12.2020
Fig. 4.2: Wiring diagram RCMB330
RCMB330
By using the jumper, the internal 120 Ω terminating resistor can be connected.
COM465IP
By means of the DIP switch, the internal 120 Ω terminating resistor can be connected.
The connections for the power supply (X1, X2) and the RS-485 interface (A,
B) are doubled, so that the wiring can be carried out directly on the device
according to the daisy-chain principle required for Modbus.
F 6 A
L1
L2
L3
N
DC 24 V
AC
DC
GND SPD
24 V
L
N
3
RCMB330
RCMB330 COM465IP
X1 X2
120 Ω 120 Ω
First device
Jumper
Last device
DIP switch
Connection RS-485 interface (Modbus RTU)
SPD =
surge protection device *)

Mounting and connection
16 RCMB330_D00389_00_M_XXEN/12.2020
4.4 Installation instructions for measuring current transformers
Do not route any shielded cables through the measuring current
transformer!
Device damage due to interference pulses!
The connecting cable (supply, analogue interface...) must not be routed
directly past the current transformer core/primary conductor.
Protective conductors and live conductors
Make sure that all current-carrying cables are routed
through the measuring current transformer.
Never route an existing protective conductor
through the measuring current transformer.
The cable diameter may not exceed half the current
transformer diameter.
Bending cables
The cables may only be bent at a certain distance
from the measuring current transformer.
* Distance to 90° angle:
2 x external diameter of the current transformer
Routing cables centrally
The cables must be aligned with the centre of the
measuring current transformer.
CAUTION
PE
L1
L2
L3
N
**

Commissioning
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RCMB330_D00389_00_M_XXEN/12.2020
5. Commissioning
5.1 Address setting
Every RCMB330 has a factory-set Modbus address. The address is 1XX, where XX = the
last two digits of the serial number.
If the preset address is to be changed, this can be done
•via a COMTRAXX® gateway,
•via Modbus.
Example:
Serial number = 12345678 —> Modbus address = 178
Each address in the bus system may only be assigned once.

Commissioning
18 RCMB330_D00389_00_M_XXEN/12.2020
5.2 Offset calibration
The RCMB330 should be calibrated after installation in the system to be monitored. The
device can be calibrated by pressing the "T/R" button and via the Modbus interface.
Offset calibration process
Fig. 5.1: LED flashing pattern
5.3 Completing and checking installation
The installation should be completed with a functional test.
Make sure that during the offset calibration the system is switched off and
no current flows through the measuring current transformer.
Phase Action LED flashing pattern
1Install the measuring current transformer in
the system and close it Aoff
2a Press and hold "T/R" button Aoff
2b Supply the device with supply voltage Us
Dlights red permanently (not ready for opera-
tion)
Eflashes red slowly (ready for calibration)
Fflashes red quickly (calibration mode)
3If LED flashes red quickly, start calibration:
Release "T/R" button Fflashes red quickly
4 Calibration in progress (approx. 10 s) Fflashes red quickly
5 Calibration finished, normal operating status Blights green permanently
To test the measuring current transformer, a known current (e.g. from an
RCD tester) must flow through the measuring current transformer and be
measured.
A
B
C
D
E
F
G

Commissioning
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RCMB330_D00389_00_M_XXEN/12.2020
5.4 Test and reset
5.4.1 Periodic self test
The RCMB330 carries out self-diagnosis of the electronics at regular intervals to ensure
that the device functions properly.
5.4.2 Manual test/reset
The integrated "T/R" button allows a function test to be performed locally at any time.
It is useful for commissioning, repair measures and periodic inspections by the system
operator.
Test Press "T/R" button for 5…10 s
Alternatively, a test can also be performed via the RS-485 interface
(register 20000).
Reset Press "T/R" button for 1.5…5 s
Alternatively, a reset can also be performed via the RS-485 interface
(register 20001):
5.4.3 Offset calibration
If the compensation range of the measurement technology has been exceeded during
operation, an offset calibration must be performed (see Page 18).
5.4.4 Testing measuring channels
Via register 20010, a test alarm can be activated for each measuring channel. The re-
spective detailed measuring channel (4000...7999) switches to alarm state for one
minute.

LED
20 RCMB330_D00389_00_M_XXEN/12.2020
6. LED
The LED indicates the module state by means of colours and lighting/flashing.
Tab. 6.1: LED indicates system state
LED flashing pattern
No. Description
ADevice switched off
Device is de-energised, no monitoring, no monitoring function (LED is off).
B
Normal operating state
The device is supplied with the specified voltage and ready for operation. It monitors the pri-
mary circuit (lights green).
C
Prewarning
The device is supplied with the specified voltage and monitors the primary circuit. A fault
current flows that exceeds the set prewarning limit.
D
Main alarm
The device is supplied with the specified voltage and monitors the primary circuit (lights
red). A fault current flows that exceeds the set main alarm limit.
E
Degaussing/offset calibration required
Compensation range of the measurement technology has been exceeded (> 100 A) (flashes
red slowly). Degaussing/offset calibration must be performed.
Device error
The device is supplied with the specified voltage and monitors the primary circuit. An error is
detected by the periodic self tests.
FDegaussing/offset calibration mode active
Offset calibration procedure: see Page 18 (flashes red quickly).
G
Device signalling
Use (Modbus register 20006 = 2) to detect the device in its environment faster. It is automat-
ically deactivated after one minute (flashes quickly red and green in alternation with a
pause).
A
B
C
D
E
F
G