Bender RCMA420 User manual

Power in electrical safety
Operating Manual
RCMA420
Residual current monitor
for monitoring AC, DC and pulsed DC currents
in TN and TT systems
Software version D242 V1.1x
TGH1411en/08.2009

Dipl.-Ing. W. Bender GmbH & Co. KG
Londorfer Str. 65 • 35305 Grünberg • Germany
Postfach 1161 • 35301 Grünberg • Germany
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]om
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
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TGH1411en/08.2009
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 ............................................................................................ 11
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 ...................................................................................... 12
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

Table of Contents
4TGH1411en/08.2009
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 .......................................................................... 29
5.5.11 History memory query ................................................................................. 29
5.6 Commissioning .............................................................................................. 30
5.7 Factory setting ................................................................................................ 30
5.8 Standards, approvals and certifications ................................................ 30
6. Technical data ................................................................................................ 31
6.1 Data in tabular form ..................................................................................... 31
6.2 Ordering information ................................................................................... 34
6.3 Timing diagram: Overcurrent monitoring ............................................ 35
6.4 Error codes ....................................................................................................... 36

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TGH1411en/08.2009
1. Effective use of this manual
1.1 Notes for the user
This manual is intended for experts in electrical engineering and elec-
tronics!
In order to make it easier for you to find specific text passages or refer-
ences in this manual and for reasons of comprehensibility, important in-
formation is emphasized by symbols. The meaning of these symbols is
explained below:
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 cur-
rents may occur. These are in particular loads containing six-pulse rec-
tifiers 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 (IΔn1 = 50…100 % of the set response value IΔn2) and alarm
( IΔn2). Since the values are measured with measuring current transform-
ers, the RCMA is nearly independent of the nominal voltage and the load
current of the system being monitored.
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.

Effective use of this manual
6TGH1411en/08.2009
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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TGH1411en/08.2009
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 car-
ried 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.
 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 direc-
tive.
Unprofessional work activities on electrical installations
may result in a threat of danger to life and limb!

Safety information
8TGH1411en/08.2009

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TGH1411en/08.2009
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 Usis applied, the starting delay is activated.
Measured values changing during this time do not influence the switch-
ing state of the alarm relays. Residual current measurement takes place
via an external measuring current transformer of the W20AB…W60AB
series. The currently measured value is shown on the LC display. In this
way any changes, for example when circuits are connected to the sys-
tem, can be recognized easily. If the measured value exceeds one or
both response values, the response delays ton1/2 start running. Once the
response delay ton1/2 has elapsed, the K1/K2 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 toff
begins. Once the release delay toff has elapsed, the alarm relays return
to their original state and the alarm LEDs AL1/AL2 go out. If the fault
memory is activated, the alarm relays remain in the alarm state and the

Function
10 TGH1411en/08.2009
LEDs light until the reset button is pressed or until the supply voltage is
interrupted. 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 re-
turn to their initial position by pressing the reset button R. A second cas-
caded 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 IΔn1 and IΔn2 can be queried pressing the Up and Down keys ( <
1.5 s). Switchover 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 dis-
play elements appear on the display.

Function
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TGH1411en/08.2009
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).
For example, E08 means: Incorrect internal calibration. In such a case
please contact the Bender Service.
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 exceed-
ed, 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, residual current IΔn1, residual current
IΔn2 or alarm by device test can be assigned to the alarm relays via the
"out" menu.
3.2.8 Time delays t, ton and toff
The times t, ton and toff, described below, delay the output of alarms via
LEDs and relays.
3.2.9 Starting delay t
After connection to the supply voltage US, the alarm indication is de-
layed by the preset time t (0...10 s).
3.2.10 Response delay ton1/2
If the residual current increases above or falls below the response value
the response time tan expires. After the expiry of the response time an
alarm is signalled. A set response delay ton1/2 (0...10 s) adds up to the
device-related operating time tae and delays alarm signalling (total delay
time tan = tae + ton).
If the residual current fault changes from a value above the response

Function
12 TGH1411en/08.2009
value to a value below the response value, an alarm will not be sig-
nalled.
3.2.11 Delay on release toff
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 contin-
uously maintained for the selected period.
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 possi-
ble 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 mem-
ory 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

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TGH1411en/08.2009
4. Installation and connection
General dimension diagram and drawing for screw fixing
The front plate cover is easy to open at the lower part marked by an
arrow.
Ensure safe isolation from supply in the installation area. Ob-
serve the installation rules for live working.
90 mm
45
67,5
36 mm
31,1
47,5
70,5
100 mm
116 mm
Zubehör/
Accessory

Installation and connection
14 TGH1411en/08.2009
1. DIN rail mounting:
Snap the rear mounting clip of the device into place in such a way that
a safe and tight fit is ensured.
Screw fixing:
Use a tool to move the rear mounting clips (a second mounting clip
required, see ordering information) to a position that it projects
beyond the enclosure. Then fix the device using two M4 screws.
2. Wiring
Connect the device according the wiring diagram.
Terminal Connections
A1, A2 Connection to supply voltage Us
1Socket for the connecting cable WX... to the
measuring current transformer
T/R Connection to the combined test/reset button
11, 12, 14 Alarm relay K1
21, 22, 24 Alarm relay K2
T/R
11 1412
21 2422
A2A1
T/R
WX...
1234
kl
+
0
-
k
l
-
0
+
W...AB
1
a
b
ab
T
T

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TGH1411en/08.2009
5. Operation and setting
5.1 Display elements in use
A detailed description of the meaning of the display elements in use is
given in the table below.
Display elements in use Elemen
tFunction
RL Reload function with memory = off
(L = I.)
I2 Response value IΔn2 as mA
(Alarm 2)
I1 Response value IΔn1 as % of IΔn2
(Alarm 1, prewarning)
r1, 1
r2, 2
Alarm relay K1
Alarm relay K2
I Hys,
%Response value hysteresis as %
ton1,
ton2,
t,
toff
Response delay ton1 (K1)
Response delay ton2 (K2)
Starting delay t,
Delay on release toff for K2
MFault memory active
Relay operating mode K2
Password protection enabled

Operation and setting
16 TGH1411en/08.2009
5.2 Function of the operating elements
Device front Element Function
ON,
green
LED lighting continuously: Power
On
Flashing LED:
System fault or connection moni-
toring fault
AL1,
AL2
LED Alarm 1 lights (yellow):
Response value 1 reached (IΔn1)
LED Alarm 2 lights (yellow):
Response value 2 reached (IΔn2)
13 mA
M
13 mA flow through
the measuring current transformer,
Fault memory active
T, Test button (> 1.5 s):
To indicate the available display ele-
ments, to start a self test;
Up key (< 1.5 s):
Menu items/values
R, Reset button (> 1.5 s):
Deleting the fault memory;
Down key (< 1.5 s):
Menu items/values
MENU, MENU key (> 1.5 s):
Starting the menu mode;
Enter key (< 1.5 s):
Confirm menu item, submenu item
and value.
Enter key (> 1.5 s):
Back to the next higher menu level.
ON AL1 AL2
TMENUR

Operation and setting
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5.3 Menu structure
All adjustable parameters are listed in the columns "menu item" and "ad-
justable parameters". A display-like representation is used to illustrate
the parameters in the column menu item. Different alarm categories can
be assigned to the alarm relays K1, K2 via the submenus r1, r2. This is
done by activation or deactivation of the respective function.
Menu Sub
Menu
Menu
item
Activati
on Adjustable parameter
AL
(response -
values)
> I2 - (HI) IΔn2 (Alarm 2)
> I1 - (HI) IΔn1 as % of IΔn2
(Alarm 1, prewarning)
Hys - Hysteresis IΔn1 / IΔn2
out
(output con-
trol)
MONFault memory
1-Operating mode K1 (n.c.)
2-Operating mode K2 (n.c.)
RL - Reload function (memory =
off)
r1
(K1: (assign-
ment alarm
category)
1 Err ON Device error at K1
r1 I1 off Prewarning IΔn1 at K1
r1 I2 ON Alarm IΔn2 at K1
1 tES ON Device test
r2
(K2: (assign-
ment alarm
category)
2 Err ON Device error at K2
r2 I1 off Prewarning IΔn1 at K2
r2 I2 ON Alarm IΔn2 at K2
2 tES ON Device test

Operation and setting
18 TGH1411en/08.2009
5.4 Display in standard mode
By default, the currently measured residual current is displayed. The
current response values I1 (prewarning) and I2 (alarm) can be displayed
using the Up and Down key. Press the Enter key to return to the meas-
ured value.
t
(timing
check)
t on 1 - Response delay K1
t on 2 - Response delay K2
t- Starting delay
t off - Delay on release K1/K2
Set
(device con-
trol)
I 12 HI Selectable parameters:
High, window function, low
off Parameter setting via pass-
word
FAC - Restore factory settings
SYS - Function blocked
InF -Display hard / software ver-
sion
HiS Clr - History memory for the first
alarm value, erasable
In the standard mode, the currently set response values I1 and I2
can be displayed using the Up and Down keys.
Menu Sub
Menu
Menu
item
Activati
on Adjustable parameter

Operation and setting
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TGH1411en/08.2009
5.5 Display in menu mode
5.5.1 Parameter query and setting: overview
Menu
item Adjustable parameter
AL Response values query and setting:
– Residual current I2 (IΔn2) (AL2)
– Residual current I1 (IΔn1) (AL1)
– Hysteresis of the response values: % Hys
out Configuration of the fault memory and the alarm relays:
– Activate/deactivate the fault memory
– Select N/O operation (n.o.) or N/C operation (n.c.)
individually for each K1/K2
– Specify the number of the reload cycles
– Assign the alarm category I1 (IΔn1) or I2 (IΔn2), relay test
or device error individually to K1/K2 (1, r1/ 2, r2).
tSet delays:
– Response delay ton1/ton2
– Starting delay t
– Delay on release toff (LED, relay)
SEt Device control parameter setting:
– Select the appropriate parameter for response values:
overcurrent mode (HI), undercurrent mode (Lo) or win-
dow mode (In).
– Enable or disable password protection, change the pass-
word.
– Restore factory settings.
– Service menu SyS blocked
InF Query hard and software version
HiS Query the first stored alarm value.
ESC Move to the next higher menu level (back)

Operation and setting
20 TGH1411en/08.2009
Menu structure
t < 1,5 s
t >1,5 s
t > 1,5 s
t > 1,5 s
t < 1,5 s
AL
out
t
SEt
In
HiS
ESC
ESC