Bender RCMA421H-DCB User manual

Manual
RCMA421H-DCB
WN-35BS
Residual current monitor
for monitoring AC, DC and pulsed DC currents
in earthed and resistance earthed systems
Software version D290 V1.0x
RCMA421H-DCB_D00062_00_M_XXEN/05.2014

©Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Bender GmbH & Co. KG
P.O. Box 1161 • 35301 Gruenberg • Germany
Londorfer Str. 65 • 35305 Gruenberg • Germany
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]
Web: http://www.bender.de

Table of Contents
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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
1. Making effective use of this document ....................................................... 5
1.1 How to use this manual ................................................................................. 5
1.2 Intended use ...................................................................................................... 5
2. Safety instructions ........................................................................................... 7
2.1 General safety instructions ........................................................................... 7
2.2 Working on electrical installations ............................................................. 7
2.3 Device-specific safety instructions ............................................................. 7
3. Function ............................................................................................................. 9
3.1 Device features ................................................................................................. 9
3.2 Description of function ............................................................................... 10
3.2.1 Transformer monitoring ............................................................................. 10
3.2.2 Quick query of the rated residual operating current ....................... 11
3.2.3 Self-test, automatic ....................................................................................... 11
3.2.4 Self-test, manual ............................................................................................ 11
3.2.5 Malfunction ..................................................................................................... 12
3.2.6 Password protection (on, OFF) ................................................................. 12
3.2.7 Factory setting FAC ...................................................................................... 12
3.2.8 Erasable history memory HiS .................................................................... 12
3.2.9 RS-485 interface ............................................................................................. 12

Table of Contents
4RCMA421H-DCB_D00062_00_M_XXEN/05.2014
4. Installation and connection ......................................................................... 13
4.1 Dimension diagrams .................................................................................... 13
4.2 Factory setting ................................................................................................ 16
4.3 Commissioning .............................................................................................. 16
5. Operation and configuration ...................................................................... 17
5.1 Getting to know the user interface ......................................................... 17
5.2 Understanding information on the standard display ...................... 18
5.3 Getting to know buttons and button functions ................................ 18
5.4 Starting a manual self-test ......................................................................... 20
5.5 Erasing the fault memory ........................................................................... 20
5.6 Calling up and exiting the menu ............................................................. 20
5.7 Making settings in the menu .................................................................... 21
5.7.1 Selecting menus ............................................................................................ 21
5.7.2 Querying the software version with the InF menu ........................... 22
5.7.3 Setting the bus address .............................................................................. 22
5.7.4 Making settings in the SEt menu ............................................................. 23
5.7.5 Querying and erasing the fault memory in the HIS menu ............. 25
6. Technical data ................................................................................................ 27
6.1 Data RCMA421H-DCB-2 in table form ................................................... 27
6.2 Error codes ....................................................................................................... 30
6.3 Recommended contactors ........................................................................ 32
6.4 Response times of the RCMA421H system plus contactor in ac-
cordance with UL943 ................................................................................... 33
6.5 Ordering information ................................................................................... 34
6.6 Standards, approvals and certifications ................................................ 34
INDEX .................................................................................................................... 35

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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
1. Making effective use of this document
1.1 How to use this manual
This manual has been designed for electrically skilled persons
working in electrical engineering and electronics.
To make it easier for you to understand and revisit certain sections of text and
instructions in the manual, we have used symbols to identify important in-
structions and information. Examples of how such symbols are used appear
below:
1.2 Intended use
The AC/DC sensitive residual current monitor RCMA421H-DCB with its meas-
uring current transformer WN-35BS is used to monitor earthed and resistive
earthed systems (TN and TT systems) in which DC and AC fault currents may
occur. These systems involve loads with six-pulse bridge rectifiers or half-
wave rectifiers with smoothing, e.g. converters and chargers.
In the event of a rated residual operating current IΔnof 6 mA, the device will
switch an alarm relay and the associated contactor in accordance with the op-
erating time specified in UL943.
The warning symbol indicates a potential dangerous
situation that may result in bodily injury and/or damage
to property.
Observe the associated safety instructions.
Information intended to assist the user to make optimum
use of the product are marked with the Info symbol.

Making effective use of this document
6RCMA421H-DCB_D00062_00_M_XXEN/05.2014

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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
2. Safety instructions
2.1 General safety instructions
In addition to these operating instructions, the “Important safety instruction
for Bender products”, which are also included in the scope of supply, are an in-
tegral part of the device documentation.
2.2 Working on electrical installations
 Only skilled persons are permitted to carry out the work necessary to
install, commission and run a device or system.
 Compliance with applicable regulations governing work on electrical
installations, and with the regulations derived from and associated
with them, is mandatory. EN 50110 is of particular importance in this
regard.
 If the device is being used in a location outside the Federal Republic of
Germany, the applicable local standards and regulations must be com-
plied with. European standard EN 50110 can be used as a guide.
2.3 Device-specific safety instructions
Failure to carry out work on electrical installations prop-
erly and correctly can put life and limb at risk!
According to UL943 every residual current monitor and
the associated measuring current transformer is to be
tested in pairs. The relevant serial number for the trans-
former is imprinted on the enclosure of the RCMA421H.
The residual current monitor and the measuring current
transformer assigned to it may only be used or inter-
changed in pairs.

Safety instructions
8RCMA421H-DCB_D00062_00_M_XXEN/05.2014

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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
3. Function
3.1 Device features
 AC/DC sensitive residual current monitor with external 35 mm measur-
ing current transformer
 Can be used in conjunction with a UL508-listed contactor
 Rated residual operating current IΔn= 6 mA to UL943
 Operating time to UL943
 rms value measurement, frequency range 0…150 Hz
 Measured value display via multi-functional LCD
 Alarm signalling via LEDs (TPD, ERR) and K2 changeover contact
 Password protection to prevent unauthorised changes being made to
device settings
 Permanent fault memory
 N/C operation of alarm relay
 Device test when the power supply voltage is connected
 Automatic self test every 24 hours
 CT-connection monitoring
 RS-485 interface can be terminated with switch
 Internal test circuit to UL943 without additional external components
 Internal test and reset button
 N-PE conductor monitoring on the load side

Function
10 RCMA421H-DCB_D00062_00_M_XXEN/05.2014
3.2 Description of function
The RCMA421H-DCB runs a device test when the power supply voltage is con-
nected. During the start-up phase, the TRP LED lights up and the alarm relay
switches to the alarm setting. Once the device test has been completed suc-
cessfully, the ERR alarm LED will stop flashing, the TPD LED will go out and the
alarm relay will return to the normal setting.
The device will check the circuit for the presence of residual currents even dur-
ing the self-test.
An external measuring current transformer (e.g. WN-35BS) is used for residual
current measurement. The actual measured value is indicated on the LCD.
This means that changes (e.g. as occur when outgoing feeders switch in) can
easily be detected. If the rated residual operating current of 6 mA is exceeded,
the alarm relay K2 will change to the alarm state and the TRP alarm LED will
light up.
Once the alarm relay has switched, the residual current must fall to less than
the rated residual operating current. If it does not, error code E.04 will appear
on the display and the ERR alarm LED will flash. This means that the connected
contactor has not shut down the faulty circuit.
If the residual current falls below the release value, the error will continue to
be signalled due to the permanently activated fault memory. The alarm relay
K2 will not switch back to the initial state and the TRP alarm LED will not go
out until the Reset button R is pressed or the power supply voltage Usis inter-
rupted.
Parameters are assigned to the device via the LCD and the control keys on the
front panel; this function can be password-protected.
A reset is also possible via the RS-485 interface by activating the RESET com-
mand, for example, via an externally connected MK2430 alarm indicator and
test combination.
3.2.1 Transformer monitoring
The connections to the measuring current transformer are checked periodi-
cally every 10 s for short and open circuits. In the event of an error, the alarm
relay K2 will switch, the red TPD alarm LED will light up and the green ERR

Function
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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
alarm LED will flash (error codes E.01 or E.03). Once the error has been elimi-
nated, the alarm LEDs and the alarm relay will remain in the alarm state. Press-
ing the Reset button R or sending a RESET command via the RS-485 interface
will switch K2 back to its initial state and the alarm LEDs will go out.
3.2.2 Quick query of the rated residual operating current
When the display is in standard mode, the rated residual operating current IΔn
= 6 mA can be queried by pressing the Up or Down button
(< 1.5 s). Switching to menu mode is not necessary. Quick query mode can be
exited by pressing Enter (< 1.5 s).
3.2.3 Self-test, automatic
The device runs a self-test every 24 hours. Any internal malfunctions detected
are shown on the display as error codes. The automatic self-test is carried out
without internal fault current. The alarm relay is not switched during the 24-
hour test.
3.2.4 Self-test, manual
The device runs a self-test when the test button is pressed (> 1.5 s). Any inter-
nal malfunctions detected are shown on the display as error codes.
Whilst the test button T is pressed, all display elements available for this de-
vice are shown. When the button is released, the tES test symbol appears and
the manual self-test commences.
During the manual self-test, an internal test current of approx. 7 mA is evalu-
ated. Consequently, the TPD alarm LED lights up and the alarm relay switches.
Once the alarm relay has switched, the residual current must fall to less than
the rated residual operating current. If it does not, error code E.04 will appear
on the display to indicate that the connected contactor has not shut down the
load circuit.
If the self test has not been successfully, the alarm LED TPD will light, the alarm
LED ERR will flash, the alarm relay will switch to the alarm state and an error
code will be displayed.

Function
12 RCMA421H-DCB_D00062_00_M_XXEN/05.2014
3.2.5 Malfunction
In the event of an internal malfunction, the alarm LED TPD will light and the
alarm LED ERR will flash. An error code will appear on the display until the fault
is removed. Information about error codes appears on page 30.
3.2.6 Password protection (on, OFF)
If password protection has been activated (on), settings can only be made
subject to the correct password being entered (0…999).
3.2.7 Factory setting FAC
Activating the factory setting will reset all modified settings, with the excep-
tion of the device address, to the default upon delivery.
3.2.8 Erasable history memory HiS
The first alarm value to occur is written to this memory. The memory can be
erased via the HiS menu.
3.2.9 RS-485 interface
This interface provides the device with a means of communicating with an
alarm indicator and test combination (e.g. MK2430). The ability to output up-
to-date measured values and alarms is just one of the features supported. Test
and reset commands can be sent to the
RCMA421H-DCB from the MK2430.

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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
4. Installation and connection
4.1 Dimension diagrams
RCMA421H dimension diagram and drawing for screw fixing
The front plate cover is easy to open at the lower part marked by an arrow.
Make sure that the installation area has been de-energised and
ensure compliance with the regulations for working on electri-
cal installations.
36 mm
90 mm
Zubehör/
Accessory
100 mm
116 mm

Installation and connection
14 RCMA421H-DCB_D00062_00_M_XXEN/05.2014
Dimension diagram for measuring current transformer WN-35BS
Dimensions in mm
62
51,20
42
57
90 79
37
4,60
35
99,50
71

Installation and connection
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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
1. Mounting on a DIN rail:
Snap the mounting clip at the rear of the device onto the DIN rail so
that it sits securely.
Screw fixing:
Using a tool, position the rear mounting clips (a second mounting clip
is required, see the ordering information) so that it protrudes over the
enclosure. Fix the device in place with two M4 screws.
2. Wiring
The device must be wired as illustrated in the connection diagram
(example).
Terminal Connections
A1, A2 Connection to the power supply voltage Us
1Bush for measuring current transformer’s connecting cable
T1, T2 Test connections for internal monitoring circuit
A, B RS-485 interface, can be terminated with switch R
21, 22, 24 Alarm relay K2: Connection to contactor or load switch
WN-…BS Measuring current transformer
K1 Recommended contactors are listed in the table on page 32
T1 T2
K1
K1
T1
BA
A2A1
T2
1
21 2422
on
off
A
B
RRS485
WN-...BS
6
<
U
k1
k2
T
I1
I2
T
MK2430
A
B
3,15 A 3,15 A

Installation and connection
16 RCMA421H-DCB_D00062_00_M_XXEN/05.2014
Conductor colours for measuring current transformer
4.2 Factory setting
4.3 Commissioning
Checks must be carried out prior to commissioning to ensure that the residual
current monitor, the external measuring current transformer and the associ-
ated contactors and peripherals have been connected correctly.
Colour Pin
assignment Colour Pin
assignment
Brown k1 Black I1
Orange k2 Red I2
Pink T Violet T
Rated residual operating cur-
rent, fixed value:
Hysteresis, fixed value:
Bus address:
Bus terminating resistor R:
Fault memory M:
Mode of operation K2:
Password:
6 mA
15%
2
Off
Permanently activated
Permanent
N/C operation (n.c.)
0, deactivated (off)
Incorrect connections can lead to personal injury and damage
to equipment or property!

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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
5. Operation and configuration
5.1 Getting to know the user interface
1 Green Power ON LED:
Lights up when the power supply
voltage is connected and the device is
running.
2 Red TPD alarm LED:
Lights up when the rated residual
operating current IΔnis exceeded.
3 Yellow ERR alarm LED:
Flashes in the event of system errors.
An error code will appear on the
display (e.g. E.03).
4DISPLAY:
Displays operating information.
5 ENTER (< 1.5 s/MENU (> 1.5 s) button:
Press this button to apply entries and
changes and call up the menu.
6 DOWN (< 1.5 s)/RESET (> 1.5 s) button:
Press this button to reduce input
values and navigate through the
menu, as well as to perform a reset.
7 UP (< 1.5 s)/TEST (> 1.5 s) button:
Press this button to increase input
values and navigate through the
menu, as well as to run a manual self-
test.
Fig. 5.1: User interface

Operation and configuration
18 RCMA421H-DCB_D00062_00_M_XXEN/05.2014
5.2 Understanding information on the standard display
The actual measured residual current is displayed by default.
Press the Up or Down button to display the factory-set rated residual operat-
ing current IΔn. Pressing the Enter button restores the measured value.
5.3 Getting to know buttons and button functions
The table below lists the functions of the buttons when navigating through
the display, navigating through the menu and when making settings. From
In standard operation, the display can be toggled to the fixed
rated residual operating current I
Δ nof 6 mA using the Up/Down
button.
Fig. 5.1: Standard display
1 Measured value display in mA:
2CurrenttypedisplayAC/DC
3 Password protection
activated
4 Fault memory activated

Operation and configuration
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RCMA421H-DCB_D00062_00_M_XXEN/05.2014
Chapter 5.7 Making settings in the menu onwards, just the relevant button
symbol is used to indicate that buttons have been pressed.
Button Button symbol Function
Up/
Test
 Call up next display
 Go to next menu/sub-menu/cate-
gory item
 Activate parameter
 Change (increase) parameter value
 Press and hold down button for
more than 1.5 seconds: run manual
self-test.
Down/
Reset
 Call up next display
 Go to next menu/sub-menu
 Deactivate parameter
 Change (reduce) parameter value
 Press and hold down button for
more than 1.5 seconds: erase fault
memory.
ENTER/
Menu
 Call up menu/sub-menu
 Apply modified parameter value
 Press and hold down button for
more than 1.5 seconds: call up
menu/exit menu/go to next highest
sub-menu
T
R
MENU

Operation and configuration
20 RCMA421H-DCB_D00062_00_M_XXEN/05.2014
5.4 Starting a manual self-test
You can start a self-test manually. During the test, any internal malfunctions
detected are shown on the display as error codes. The alarm relay will be
switched.
To start a self-test manually:
 Press and hold down the test button T (UP) for more than 1.5 seconds.
5.5 Erasing the fault memory
The device has an erasable fault memory.
To erase the fault memory:
 Press and hold down the reset button R (DOWN) for more than 1.5 sec-
onds.
5.6 Calling up and exiting the menu
To call up the menu:
 Press and hold down the MENU (ENTER) button for more than
1.5 seconds.
To exit the menu again:
 Press and hold down the MENU (ENTER) button again for more than
1.5 seconds.
The text “tES” appears on the display along with all avail-
able display elements.
The areas of the display which can be configured flash. This is in-
dicated by an oval marker in the illustrations below. Press and
hold down the MENU button > 1.5 s to enter menu mode.