Bender RCMA420-D-1, RCMA420-D-2, RCMA420 User guide
Operating Manual
for monitoring AC, DC and pulsed DC currents
RCMA420
Residual current monitor
in TN and TT systems
Software version D242 V1.2x
Power in electrical safety
TGH1411en/03.2011
Dipl.-Ing. W. Bender GmbH & Co. KG
Londorfer Str. 65 • 35305 Grünberg • Germany
Postfach 1161 • 35301 Grünberg • Germany
Tel.: +49 6401 807-0
Fax: +49 6401 807-259
E-Mail: info@bender-de.com
Web: http://www.bender-de.com
© Dipl.-Ing. W. Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Table of Contents
1. Effective use of this manual ........................................................................... 5
1.1 Notes for the user ............................................................................................. 5
1.2 Intended use ...................................................................................................... 5
1.3 Information about factory setting ............................................................. 6
2. Safety information ........................................................................................... 7
2.1 Safety information ........................................................................................... 7
2.2 Work activities on electrical installations ................................................ 7
3. Function ............................................................................................................. 9
3.1 Device features ................................................................................................. 9
3.2 Function ............................................................................................................... 9
3.2.1 Connection monitoring .............................................................................. 10
3.2.2 Fast response value query ......................................................................... 10
3.2.3 Automatic self test ........................................................................................ 10
3.2.4 Manual self test .............................................................................................. 10
3.2.5 Functional faults ............................................................................................ 10
3.2.6 Set the number of reload cycles .............................................................. 11
3.2.7 Assigning alarm categories to alarm relays K1/K2 ............................ 11
3.2.8 Time delays t, ton and toff ....................................................................... 11
3.2.9 Starting delay t ............................................................................................... 11
3.2.10 Response delay ton1/2 ................................................................................ 11
3.2.11 Delay on release toff .................................................................................... 11
3.2.12 Residual current monitoring in window discriminator mode ...... 12
3.2.13 Password protection (on, OFF) ................................................................. 12
3.2.14 Factory setting FAC ...................................................................................... 12
3.2.15 Erasable history memory ............................................................................ 12
3.2.16 External, combined test/reset button T/R ............................................ 12
3.2.17 Fault memory ................................................................................................. 12
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Table of Contents
4. Installation and connection ......................................................................... 13
5. Operation and setting .................................................................................. 15
5.1 Display elements in use .............................................................................. 15
5.2 Function of the operating elements ...................................................... 16
5.3 Menu structure ............................................................................................... 17
5.4 Display in standard mode .......................................................................... 18
5.5 Display in menu mode ................................................................................ 19
5.5.1 Parameter query and setting: overview ................................................ 19
5.5.2 Changeover from overcurrent to undercurrent mode
or to window mode ...................................................................................... 21
5.5.3 Response value setting for overcurrent: ............................................... 22
5.5.4 Setting the fault memory and alarm relay operating mode .......... 23
5.5.5 Assigning alarm categories to the alarm relays ................................. 24
5.5.6 Set the time delays ....................................................................................... 26
5.5.7 Changing from overcurrent operation to window operation ...... 27
5.5.8 Factory setting and password protection ............................................ 27
5.5.9 Restoring factory settings .......................................................................... 29
5.5.10 Device information query (Example) ..................................................... 29
5.5.11 History memory query ................................................................................. 29
5.6 Commissioning .............................................................................................. 30
5.7 Factory setting ................................................................................................ 30
6. Technical data ................................................................................................ 31
6.1 Data in tabular form ..................................................................................... 31
6.2 Standards, approvals and certifications ................................................ 34
6.3 Ordering information ................................................................................... 35
6.4 Error codes ....................................................................................................... 36
INDEX .................................................................................................................... 37
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1. Effective use of this manual
1.1 Notes for the user
This manual is intended for experts in electrical engineering and electronics!
In order to make it easier for you to find specific text passages or references in
this manual and for reasons of comprehensibility, important information is
emphasized by symbols. The meaning of these symbols is explained below:
Information calling attention to hazards are marked
with this warning symbol.
Information intended to assist the user to make optimum
use of the product are marked with the Info symbol.
1.2 Intended use
The AC/DC sensitive residual current monitor RCMA420 is designed for use in
earthed systems (TN and TT systems) where DC and AC fault currents may occur. These are in particular loads containing six-pulse rectifiers or one way rectifiers with smoothing, such as converters, battery chargers, construction site
equipment with frequency-controlled drives.
Two separately adjustable response ranges allow to distinguish between prewarning (I
Since the values are measured with measuring current transformers, the
RCMA is nearly independent of the nominal voltage and the load current of
the system being monitored.
= 50…100 % of the set response value I
Δn1
) and alarm ( I
Δn2
Δn2
).
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Effective use of this manual
1.3 Information about factory setting
Page 30 provides a summary of all factory settings.
If you want to reset the residual current monitor to factory settings, refer to
page 29.
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2. Safety information
2.1 Safety information
In addition to this data sheet, the documentation of the device includes a
sheet entitled "Important safety instructions for BENDER products“.
2.2 Work activities on electrical installations
All work activities necessary for installation, commissioning or work
activities during operation of electrical devices or systems are to be carried out by adequately skilled personnel.
Observe the relevant regulations applying to work on electrical instal-
lations, in particular DIN EN 50110 or its subsequent regulations.
Unprofessional work activities on electrical installations
may result in a threat of danger to life and limb!
If the equipment is used outside the Federal Republic of Germany, the
respective national standards and regulations are to be observed. The
European standard EN 50110 is recommended to be used as a directive.
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Safety information
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3. Function
3.1 Device features
AC/DC sensitive residual current monitor Type B according to IEC
62020 and IEC 60755
Two separately adjustable response ranges (prewarning, alarm)
Adjustable switching hysteresis
r.m.s. value measurement
Starting delay, response delay and delay on release
Measured value display via multi-functional LC display
Alarm indication via LEDs (AL1, AL2) and changeover contacts (K1, K2)
N/C operation or N/O operation selectable
Password protection against unauthorized parameter changing
Fault memory function can be switched off
CT connection monitoring
3.2 Function
Once the supply voltage Us is applied, the starting delay is activated. Measured values changing during this time do not influence the switching state of
the alarm relays. Residual current measurement takes place via an external
measuring current transformer of the W20AB…W60AB series. The currently
mea sure d val ue is sho wn on the LC di spla y. In thi s way any c hanges, for e xample when circuits are connected to the system, can be recognized easily. If the
measured value exceeds one or both response values, the response delays
t
start running. Once the response delay t
on1/2
alarm relays switch and the alarm LEDs AL1/AL2 light up. If the residual current falls below the release value (response value minus hysteresis), the delay
on release t
return to their original state and the alarm LEDs AL1/AL2 go out. If the fault
begins. Once the release delay t
off
memory is activated, the alarm relays remain in the alarm state and the LEDs
light until the reset button is pressed or until the supply voltage is interrupted.
has elapsed, the K1/K2
on1/2
has elapsed, the alarm relays
off
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Function
The device function can be tested using the TEST button. The parameterization of the device can be carried out via the LC display and the function keys
integrated in the front plate and can be password-protected.
3.2.1 Connection monitoring
The CT connections are continuously monitored. In the event of a fault, the
alarm relays K1 / K2 switch without delay, the alarm LEDs AL1 / AL2 / ON flash
(Error Code E.01). After eliminating the fault, the alarm relays automatically return to their initial position, provided that the fault memory M is deactivated.
With the fault memory activated, K1/K2 return to their initial position by pressing the reset button R. A second cascaded measuring current transformer will
not be monitored.
3.2.2 Fast response value query
With the display in standard mode, the currently measured response values
I
and I
Δn1
can be queried pressing the Up and Down keys ( < 1.5 s). Switch-
Δn2
over to the Menu mode is not required. If you want to exit the fast response
value query, press the enter key.
3.2.3 Automatic self test
The device automatically carries out a self test after connecting to the system
to be monitored and later every 24 hours. During the self test internal functional faults will be detected and appear in form of an error code on the display. The alarm relays are not checked during this test.
3.2.4 Manual self test
After pressing the test button for > 1.5 s, the device carries out a self test. During this test, internal functional faults are detected and will be displayed in
form of an error code. The alarm relays are not checked during this test.
While the test button T is pressed and held down, all device-related display elements appear on the display.
3.2.5 Functional faults
If an internal functional fault occurs, all three LEDs flash. An error code will appear on the display (E01...E32). In such a case please contact the Bender Serv-
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Function
ice.
3.2.6 Set the number of reload cycles
If faults occur only temporarily, but recurrently, in the system being monitored, with the fault memory M deactivated, the alarm relays would switch
synchronously to the error status.
RL in the out menu can be used to limit the number of these changeover processes. As soon as the preset number of switching cycles is exceeded, the fault
memory will come on and an activated alarm remains stored.
3.2.7 Assigning alarm categories to alarm relays K1/K2
The alarm categories device error, res idual current I
alarm by device test can be assigned to the alarm relays via the "out" menu.
, residual current I
Δn1
Δn2
or
3.2.8 Time delays t, t
The times t, ton and t
and t
on
described below, delay the output of alarms via LEDs
off,
off
and relays.
3.2.9 Starting delay t
After connection to the supply voltage, the alarm indication is delayed by the
preset time t (0...10 s).
3.2.10 Response delay t
on1/2
If the residual current increases above or falls below the response value the response time t
nalled. A set response delay t
operating time t
If the residual current fault changes from a value above the response value to
expires. After the expiry of the response time an alarm is sig-
an
and delays alarm signalling (total delay time tan = tae + ton).
ae
(0...10 s) adds up to the device-related
on1/2
a value below the response value, an alarm will not be signalled.
3.2.11 Delay on release t
off
When no alarm exists after deactivating the fault memory, the alarm LEDs go
out and the alarm relays switch back to their initial position. After activating
the delay on release (0...99 s), the alarm state is continuously maintained for
the selected period.
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Function
3.2.12 Residual current monitoring in window discriminator mode
Change the measuring principle by selecting the window mode (SEt / In). In
the window discriminator mode, the threshold values I1 and I2 represent the
upper and the lower value. If the measured value is not within this area, an
alarm is initiated by the device. See page 27.
3.2.13 Password protection (on, OFF)
When the password protection is activated (on), settings are only possible after entering the correct password (0...999).
3.2.14 Factory setting FAC
After activating the factory setting, all settings previously changed are reset to
delivery status.
3.2.15 Erasable history memory
The first alarm value that occurs will be saved in this memory. The memory can
be cleared via the menu HiS.
3.2.16 External, combined test/reset button T/R
Reset= Pressing the external button < 1.5 s
Test= Pressing the external button > 1.5 s
3.2.17 Fault memory
The fault memory can be activated, deactivated or set to continuous mode
(con). If the fault memory is set to "con" mode, the alarm parameters remain
stored even on failure of the supply voltage. Stored alarms can be reset by
means of the reset button R.
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