Bender RCMA420 User manual

RCMA420
Residual current monitor
for monitoring AC, DC and pulsed DC currents
in TN and TT systems
Software version D242 V1.2x
RCMA420_D00059_04_M_XXEN/05.2021 Manual EN

Bender GmbH & Co. KG
PO Box 1161 • 35301 Grünberg • Germany
Londorfer Strasse 65 • 35305 Grünberg • Germany
Tel.: [phone] • Fax: [phone]
E-Mail: [email protected] • www.bender.de
©Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission of the publisher.
Subject to change!
Photos: Bender archives

Table of Contents
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RCMA420_D00059_04_M_XXEN/05.2021
1. Important information .................................................................................... 5
1.1 How to use this manual ................................................................................. 5
1.2 Technical support: service and support ................................................... 6
1.2.1 First level support ............................................................................................. 6
1.2.2 Repair service ..................................................................................................... 6
1.2.3 Field service ........................................................................................................ 7
1.3 Training courses ................................................................................................ 7
1.4 Delivery conditions .......................................................................................... 7
1.5 Inspection, transport and storage .............................................................. 8
1.6 Warranty and liability ...................................................................................... 8
1.7 Disposal ............................................................................................................... 9
2. Safety instructions ......................................................................................... 10
2.1 General safety instructions ........................................................................ 10
2.2 Work activities on electrical installations ............................................. 10
2.3 Intended use ................................................................................................... 11
3. Function ........................................................................................................... 12
3.1 Device features .............................................................................................. 12
3.2 Function ............................................................................................................ 12
3.2.1 Connection monitoring .............................................................................. 13
3.2.2 Fast response value query ......................................................................... 13
3.2.3 Automatic self test ........................................................................................ 13
3.2.4 Manual self test .............................................................................................. 13
3.2.5 Functional faults ............................................................................................ 14
3.2.6 Set the number of reload cycles .............................................................. 14
3.2.7 Assigning alarm categories to alarm relays K1/K2 ............................ 14
3.2.8 Time delays t, ton and toff ....................................................................... 14
3.2.9 Residual current monitoring in window discriminator mode ...... 15
3.2.10 Password protection (on, OFF) ................................................................. 15
3.2.11 Factory setting FAC ...................................................................................... 15

Table of Contents
4RCMA420_D00059_04_M_XXEN/05.2021
3.2.12 Erasable history memory ............................................................................ 15
3.2.13 External, combined test/reset button T/R ............................................ 15
3.2.14 Fault memory .................................................................................................. 15
4. Installation and connection ......................................................................... 16
5. Operation and setting .................................................................................. 18
5.1 Display elements in use .............................................................................. 18
5.2 Function of the operating elements ..................................................... 19
5.3 Menu structure ............................................................................................... 20
5.4 Display in standard mode .......................................................................... 21
5.5 Display in menu mode ................................................................................ 22
5.6 Parameter settings ........................................................................................ 24
5.6.1 Response value setting for overcurrent: ............................................... 24
5.6.2 Setting the fault memory and alarm relay operating mode .......... 26
5.6.3 Assigning alarm categories to the alarm relays ................................. 27
5.6.4 Set the time delays ....................................................................................... 29
5.6.5 Changeover: overcurrent/undercurrent/window mode ................ 30
5.6.6 Factory setting and password protection ............................................ 30
5.6.7 Device information query (Example) ..................................................... 32
5.6.8 History memory query ................................................................................. 32
5.7 Commissioning .............................................................................................. 32
6. Data .................................................................................................................. 33
6.1 Factory setting ................................................................................................ 33
6.2 Error codes ....................................................................................................... 34
6.3 Technical data ................................................................................................. 35
6.4 Standards, approvals and certifications ................................................ 39
6.5 Residual operating current ranges of the different measuring
current transformers .................................................................................... 39
6.6 Ordering information ................................................................................... 39
6.7 Document revision history ......................................................................... 41
INDEX .................................................................................................................... 43

Important information
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RCMA420_D00059_04_M_XXEN/05.2021
1. Important information
1.1 How to use this manual
Always keep this manual within easy reach for future reference.
To make it easier for you to understand and revisit certain sections in this ma-
nual, we have used symbols to identify important instructions and informati-
on. The meaning of these symbols is explained below:
This manual has been compiled with great care. It might nevertheless contain
errors and mistakes. Bender cannot accept any liability for injury to persons or
damage to property resulting from errors or mistakes in this manual.
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 electrocution 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

Important information
6RCMA420_D00059_04_M_XXEN/05.2021
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers you:
1.2.1 First level support
Technical support by phone or e-mail for all Bender products
 Questions concerning specific customer applications
 Commissioning
 Troubleshooting
Telephone: [phone]*
Fax: [phone]
In Germany only: 0700BenderHelp (Tel. and Fax)
E-mail: [email protected]
1.2.2 Repair service
Repair, calibration, update and replacement service for Bender products
 Repairing, calibrating, testing and analysing Bender products
 Hardware and software update for Bender devices
 Delivery of replacement devices in the event of faulty or incorrectly
delivered Bender devices
 Extended guarantee for Bender devices, which includes an in-house
repair service or replacement devices at no extra cost
Telephone: [phone]** (technical issues)
[phone]**, -785** (sales)
Fax: [phone]
E-mail: [email protected]
Please send the devices for repair to the following address:
Bender GmbH, Repair-Service,
Londorfer Str. 65,
35305 Grünberg

Important information
7
RCMA420_D00059_04_M_XXEN/05.2021
1.2.3 Field service
On-site service for all Bender products
 Commissioning, configuring, maintenance, troubleshooting of Bender
products
 Analysis of the electrical installation in the building (power quality test,
EMC test, thermography)
 Training courses for customers
Telephone: [phone]**, -762 **(technical issues)
[phone]** (sales)
Fax: [phone]
E-mail: [e-mail]
Internet: www.bender.de
*Available from 7.00 a.m. to 8.00 p.m. 365 days a year (CET/UTC+1)
**Mo-Thu 7.00 a.m. - 8.00 p.m., Fr 7.00 a.m. - 13.00 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.
1.4 Delivery conditions
Bender sale and delivery conditions apply.
For software products the "Softwareklausel zur Überlassung von Standard-
Software als Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen
Lieferbedingungen für Erzeugnisse und Leistungen der Elektroindustrie"
(software clause in respect of the licensing of standard software as part of de-
liveries, modifications and changes to general delivery conditions for pro-
ducts and services in the electrical industry) set out by the ZVEI
(Zentralverband Elektrotechnik- und Elektronikindustrie e. V.) (German Elec-
trical and Electronic Manufacturer's Association) also applies.

Important information
8RCMA420_D00059_04_M_XXEN/05.2021
Sale and delivery conditions can be obtained from Bender in printed or
electronic format.
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 they are protected from dust,
damp, and spray and dripping water, and in which the specified storage tem-
peratures can be ensured.
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 fol-
lowing 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 recom-
mended by the manufacturer.
This operating manual, especially the safety instructions,
must be observed by all personnel working on the device. Furthermore,
the rules and regulations that apply for accident prevention at the place of use
must be observed.

Important information
9
RCMA420_D00059_04_M_XXEN/05.2021
1.7 Disposal
Abide by the national regulations and laws governing the disposal of this de-
vice. Ask your supplier if you are not sure how to dispose of the old equip-
ment.
The directive on waste electrical and electronic equipment (WEEE directive)
and the directive on the restriction of certain hazardous substances in electri-
cal and electronic equipment (RoHS directive) apply in the European Commu-
nity. In Germany, these policies are implemented through the "Electrical and
Electronic Equipment Act" (ElektroG). According to this, the following applies:
 Electrical and electronic equipment are not part of household waste.
 Batteries and accumulators are not part of household waste and 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 home-
page at www.bender.de > Service & support.

Safety instructions
10 RCMA420_D00059_04_M_XXEN/05.2021
2. Safety instructions
2.1 General safety instructions
Part of the device documentation in addition to this manual is the enclosed
"Safety instructions for Bender products".
2.2 Work activities 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 stan-
dard EN 50110 can be used as a guide.
Only qualified personnel are permitted to carry out the
work necessary to install, commission and run a device or
system.
Risk 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-energised. Observe the
rules for working on electrical installations.
DANGER

Safety instructions
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RCMA420_D00059_04_M_XXEN/05.2021
2.3 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 oc-
cur. These are in particular loads containing six-pulse rectifiers or one way rec-
tifiers 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 main alarm
( IΔn2). 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.
In order to meet the requirements of the applicable standards, customised pa-
rameter settings must be made on the equipment in order to adapt it to local
equipment and operating conditions. Please heed the limits of the range of
application indicated in the technical data.
Any use other than that described in this manual is regarded as improper.

Function
12 RCMA420_D00059_04_M_XXEN/05.2021
3. Function
3.1 Device features
 AC/DC sensitive residual current monitor Type B according to
DIN EN 62020 and IEC 60755
 Two separately adjustable response ranges (prewarning, main 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. Measu-
red 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 CTUB101-CTBC20…60 series. The cur-
rently measured value is shown on the LC display. In this way any changes, for
example when circuits are connected to the system, can be recognized easily.
If the measured value exceeds one or both response values, the response de-
lays 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 cur-
rent 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 LEDs
light until the reset button is pressed or until the supply voltage is interrupted.

Function
13
RCMA420_D00059_04_M_XXEN/05.2021
The device function can be tested using the TEST button. The parameterizati-
on of the device can be carried out via the LC display and the function keys in-
tegrated 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 re-
turn 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 pres-
sing 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
IΔn1 and IΔn2 can be queried pressing the Up and Down keys ( < 1.5 s). Switcho-
ver to the Menu mode is not required. If you want to exit the fast response va-
lue 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 functio-
nal 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. Du-
ring 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.

Function
14 RCMA420_D00059_04_M_XXEN/05.2021
3.2.5 Functional faults
If an internal functional fault occurs, all three LEDs flash. An error code will ap-
pear on the display (E01…E32). In such a case please contact the Bender Ser-
vice.
3.2.6 Set the number of reload cycles
If faults occur only temporarily, but recurrently, in the system being monito-
red, with the fault memory M deactivated, the alarm relays would switch syn-
chronously to the error status.
RL in the out menu can be used to limit the number of these changeover pro-
cesses. 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, 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.
Starting delay t
After connection to the supply voltage, the alarm indication is delayed by the
preset time t(0…10 s).
Response delay ton1/2
If the residual current increases above or falls below the response value the re-
sponse time tan expires. After the expiry of the response time an alarm is sig-
nalled. 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 value to
a value below the response value, an alarm will not be signalled.

Function
15
RCMA420_D00059_04_M_XXEN/05.2021
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 continuously maintained for
the selected period.
3.2.9 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.
3.2.10 Password protection (on, OFF)
When the password protection is activated (on), settings are only possible af-
ter entering the correct password (0…999).
3.2.11 Factory setting FAC
After activating the factory setting, all settings previously changed are reset to
delivery status.
3.2.12 Erasable history memory
The first alarm value that occurs will be saved in this memory. The memory can
be cleared via the menu HiS.
3.2.13 External, combined test/reset button T/R
Reset = Pressing the external button < 1.5 s
Test = Pressing the external button > 1.5 s
3.2.14 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 me-
ans of the reset button R.

Installation and connection
16 RCMA420_D00059_04_M_XXEN/05.2021
4. Installation and connection
Dimension diagram, drawing for screw mounting, push-wire
terminal connection
Only qualified personnel are permitted to carry out the
work necessary to install, commission and run a device or
system.
Risk 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-energised. Observe the
rules for working on electrical installations.
DANGER
36
93
74,5
90 45 70,5
47,5
31,1
Click
107
100
M4
M4
B98060008
1
2
3

Installation and connection
17
RCMA420_D00059_04_M_XXEN/05.2021
The front plate cover is easy to open at the lower part marked by an arrow.
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 bey-
ond 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
1Socket for the connecting cable CTX… to the measuring CT
T/R Connection to the combined test/reset button
11, 12, 14 Alarm relay K1
21, 22, 24 Alarm relay K2
Us
+12V –12V TGND
S1(k) S2(l)
CTUB101-
CTBC...
–12V k
T
lGND
+12V
1
CTX...
AL1 AL2
T/R
1
T/R
A1
14
11 12
2421 22
A2

Operation and setting
18 RCMA420_D00059_04_M_XXEN/05.2021
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 Ele-
ment Function
RL Reload function with memory = off (L = I.)
I2 Response value IΔn2 as mA (Main alarm)
I1 Response value IΔn1 as % of IΔn2
(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
19
RCMA420_D00059_04_M_XXEN/05.2021
5.2 Function of the operating elements
Device front Element Function
ON,
green
LED lighting continuously: Power On
Flashing LED: System fault or con-
nection monitoring fault
AL1,
AL2
LED Alarm 1 lights (yellow):
Response value 1 reached (IΔn1)
LED Alarm 2 lights (yellow): Res-
ponse 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
20 RCMA420_D00059_04_M_XXEN/05.2021
5.3 Menu structure
All adjustable parameters are listed in the columns "menu item" and "adjus-
table parameters". A display-like representation is used to illustrate the para-
meters 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
Activa-
tion Adjustable parameter
AL
(res-
ponse -
values)
> I2 - (HI) IΔn2 (Main alarm)
> I1 - (HI) IΔn1 as % of IΔn2
(Prewarning)
Hys - Hysteresis IΔn1 / IΔn2
out
(output
control)
M ON Fault 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 ON Prewarning IΔn1 at K1
r1 I2 off Main 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 Main alarm IΔn2 at K2
2 tES ON Device test