Bender LINETRAXX RCM420 User manual

Manual EN
LINETRAXX® RCM420
Residual current monitor
for AC current monitoring in TN and TT systems
RCM420_D00057_06_M_XXEN/12.2023


2 RCM420_D0005 _06_M_XXEN/12.2023

LINETRAXX® RCM420
Table of contents
1General information 5
1.1 How to use the manual.................................................................................................................................5
1.2 Indication of important instructions and information.......................................................................5
1.3 Signs and symbols...........................................................................................................................................5
1.4 Service and Support....................................................................................................................................... 5
1.5 Training courses and seminars...................................................................................................................6
1.6 Delivery conditions......................................................................................................................................... 6
1. Inspection, transport and storage.............................................................................................................6
1.8 Warranty and liability.....................................................................................................................................6
1.9 Disposal of Bender devices..........................................................................................................................
1.10 Safety....................................................................................................................................................................
2Function 8
2.1 Intended use......................................................................................................................................................8
2.2 Device features................................................................................................................................................. 8
2.3 Function...............................................................................................................................................................8
2.3.1 Connection monitoring.................................................................................................................................9
2.3.2 Fast response value query........................................................................................................................... 9
2.3.3 Automatic self test.......................................................................................................................................... 9
2.3.4 Manual self test................................................................................................................................................ 9
2.3.5 Functional faults...............................................................................................................................................9
2.3.6 Set the number of reload cycles................................................................................................................9
2.3. Assigning alarm categories to alarm relays K1/K2..............................................................................9
2.3.8 Time delays t, ton and toff...............................................................................................................................9
2.3.9 Residual current monitoring in window discriminator mode...................................................... 10
2.3.10 Password protection (on, OFF)................................................................................................................ 10
2.3.11 Factory setting FAC...................................................................................................................................... 10
2.3.12 Erasable history memory............................................................................................................................10
2.3.13 External, combined test/reset button T/R........................................................................................... 10
2.3.14 Fault memory..................................................................................................................................................10
2.3.15 Additional cascaded measuring current transformer..................................................................... 10
3Installation, connection and commissioning 11
3.1 Wiring.................................................................................................................................................................11
3.2 Commissioning...............................................................................................................................................13
RCM420_D0005 _06_M_XXEN/12.2023 3

Table of contents
4Operation and setting 14
4.1 Display elements in use..............................................................................................................................14
4.2 Function of the operating elements......................................................................................................15
4.3 Menu structure...............................................................................................................................................15
4.4 Display in standard mode..........................................................................................................................1
4.5 Display in menu mode................................................................................................................................1
5Parameter settings 19
5.1 Response value setting for overcurrent............................................................................................... 19
5.2 Fault memory..................................................................................................................................................20
5.3 Alarm relays.....................................................................................................................................................20
5.4 Alarm categories............................................................................................................................................21
5.5 Set the time delays.......................................................................................................................................22
5.6 Changeover: overcurrent/undercurrent/window mode................................................................ 23
5. Cascaded current transformer..................................................................................................................24
5.8 Password protection.................................................................................................................................... 24
5.9 Factory settings..............................................................................................................................................25
5.10 Device information query.......................................................................................................................... 26
5.11 History memory query................................................................................................................................ 26
6Technical Data 27
6.1 Factory settings..............................................................................................................................................2
6.2 Error codes.......................................................................................................................................................2
6.3 Tabular data.................................................................................................................................................... 2
6.4 Standards, approvals and certifications................................................................................................32
6.5 Ordering information...................................................................................................................................32
6.6 Document revision history........................................................................................................................ 33
4 RCM420_D0005 _06_M_XXEN/12.2023

LINETRAXX® RCM420
1 General information
1 1 How to use the manual
ADVICE
This manual is intended for qualified personnel working in electrical engineering and electronics!
Part of the device documentation in addition to this manual is the enclosed supplement ‘Safety
instructions for Bender products’.
ADVICE
Read the operating manual before mounting, connecting and commissioning the device. Keep the
manual within easy reach for future reference.
1 2 Indication of important instructions and information
DANGER
Indicates a high risk of danger that will result in death or serious injury if not avoided.
WARNING
Indicates a medium risk of danger that can lead to death or serious injury if not avoided.
CAUTION
Indicates a low-level risk that can result in minor or moderate injury or damage to property if not
avoided.
ADVICE
Indicates important facts that do not result in immediate injuries. They can lead to malfunctions if the
device is handled incorrectly.
Information can help to optimise the use of the product.
1 3 Signs and symbols
Disposal Protect from moisture Protect from dust
Temperature range Recycling RoHS directives
1 4 Service and Support
Information and contact details about customer service, repair service or field service for Bender devices are
available on the following website: Fast assistance | Bender GmbH & Co. KG.
RCM420_D0005 _06_M_XXEN/12.2023 5

General information
1 5 Training courses and seminars
Regular face-to-face or online seminars for customers and other interested parties:
www.bender.de > know-how > seminars.
1 6 Delivery conditions
The conditions of sale and delivery set out by Bender GmbH & Co. KG apply. These can be obtained in printed
or electronic format.
The following applies to software products:
Die 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’
1 7 Inspection, transport and storage
Check the shipping and device packaging for transport damage and scope of delivery. In the event of
complaints, the company must be notified immediately, see ‘www.bender.de > service & support.’.
The following must be observed when storing the devices:
1 8 Warranty and liability
Warranty and liability claims for personal injury and property damage are excluded in the case of:
•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.
•The use of accessories or spare parts that are not provided, approved or recommended by the
manufacturer.
•Catastrophes caused by external influences and force majeure.
•Mounting and installation with device combinations not approved or recommended by the manufacturer.
This operating manual and the enclosed safety instructions must be observed by all persons working with the
device. Furthermore, the rules and regulations that apply for accident prevention at the place of use must be
observed.
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LINETRAXX® RCM420
1 9 Disposal of Bender devices
Abide by the national regulations and laws governing the disposal of this device.
For more information on the disposal of Bender devices, refer to
www.bender.de > service & support.
1 10 Safety
If the device is used outside the Federal Republic of Germany, the applicable local standards and regulations
must be complied with. In Europe, the European standard EN 50110 applies.
DANGER Risk of fatal injury due to electric shock!
Touching live parts of the system carries the risk of:
•Risk of electrocution due to electric shock
•Damage to the electrical installation
•Destruction of the device
Before installing the device and before working on its connections, make sure that the installation
has been de-energised. The rules for working on electrical systems must be observed.
RCM420_D0005 _06_M_XXEN/12.2023

Function
2 Function
2 1 Intended use
The AC and pulsed DC sensitive residual current monitor RCM420 (Type A) from Bender is designed for fault
and residual current monitoring in earthed power supply systems (TN/TT systems) where an alarm is to be
activated in the event of a fault, but disconnection must be prevented. In addition, the device can be used to
monitor single conductors, such as PE conductors, N-PE connections and PE-PAS connections.
Two separately adjustable response ranges IΔ1 and IΔ2 allow to distinguish between prewarning and main
alarm (IΔ1 = 50…100 % of the set response value IΔ2).
In order to meet the requirements of the applicable standards, customised parameter 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.
2 2 Device features
•AC and pulsed DC sensitive residual current monitor Type A according to DIN EN 62020
•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
2 3 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 CTAC…, WR…
or WS… series.
The currently 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 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 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.
8 RCM420_D0005 _06_M_XXEN/12.2023

LINETRAXX® RCM420
2 3 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.
2 3 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.
2 3 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.
2 3 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.
2 3 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 Service.
2 3 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.
2 3 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.
2 3 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
RCM420_D0005 _06_M_XXEN/12.2023 9

Function
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 value to a value below the response
value, an alarm will not be signalled.
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.
2 3 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.
2 3 10 Password protection (on, OFF)
When the password protection is activated (on), settings are only possible after entering the correct password
(0…999).
2 3 11 Factory setting FAC
After activating the factory setting, all settings previously changed are reset to delivery status.
2 3 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.
2 3 13 External, combined test/reset button T/R
Reset = Pressing the external button < 1.5 s
Test = Pressing the external button > 1.5 s
2 3 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 means of the reset button R.
2 3 15 Additional cascaded measuring current transformer
Für Anwendungen, in denen Differenzströme von mehr als 10 A auftreten, kann ein zweiter externer Wandler
kaskadiert werden. Dessen Übersetzungsverhältnis kann im Menü SEt mit dem Korrekturfaktor nRCM angepasst
werden.
For applications where residual currents higher than 10 A occur, a second external transformer can be
cascaded. The transformer's transmission ratio can be adapted using the correction factor nRCM in the SEt
menu.
10 RCM420_D0005 _06_M_XXEN/12.2023

LINETRAXX® RCM420
3 Installation, connection and commissioning
Only skilled persons are permitted to carry out the work necessary to install, put into service and run a
device or system.
DANGER Risk of fatal injury due to electric shock!
Touching live parts of the system carries the risk of:
•Risk of electrocution due to electric shock
•Damage to the electrical installation
•Destruction of the device
Before installing the device and before working on its connections, make sure that the installation
has been de-energised. The rules for working on electrical systems must be observed.
Dimension diagram, drawing for screw mounting, push-wire terminal connection
36
93
4.5
90 45 0.5
4 .5
31.1
Click
107
100
M4
M4
B98060008
All dimensions in mm.
The front plate cover is easy to open at the lower part marked by an arrow.
Mounting
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.
3 1 Wiring
Connect the device according the wiring diagram.
RCM420_D0005 _06_M_XXEN/12.2023 11

Installation, connection and commissioning
Wiring diagram
Terminal Connections
A1, A2 Connection to supply voltage
k, l Connection of measuring current transformers
T/R Connection to the combined test/reset button
11, 12, 1 Alarm relay K1
21, 22, 2 Alarm relay K2
12 RCM420_D0005 _06_M_XXEN/12.2023

LINETRAXX® RCM420
Connection of an additional cascaded measuring current transformer
If the residual current range of 10 A is not sufficient, an additional measuring current transformer can be
cascaded. Connect the measuring current transformer as illustrated in the drawing below.
E ample
An additionally cascaded transformer on the load side has a transmission ratio of X1 = 100 (500 A / 5 A). That
means, when the lowest value of 10 mA is set at the RCM420, a current of 1 A can only just be detected on the
primary side of the transformer on the load side. In order to reduce the value that can be detected to 100 mA,
10 turns of the supply cable has to be routed through the transformer on the RCM side.
Hence, the correction factor to be set is nRCM = X1:X2 = 100:10 = 10. The correction factor can be set via the
SEt/n menu.
The correction factor is factory set to 1 and relates to normal operation with one Bender measuring current
transformer only (X = 600:1).
3 2 Commissioning
Prior to commissioning, check proper connection of the residual current monitor.
RCM420_D0005 _06_M_XXEN/12.2023 13

Operation and setting
4 Operation and setting
4 1 Display elements in use
A detailed description of the meaning of the display elements in use is given in the table below.
on off
Hys M
t
%
RI. n12
s
k
mA
>
<
Display-Elemente
Element Function
RL Reload function with memory = off (L = I.)
n Transformation ratio factor for a second external measuring current transformer
I2 Response value IΔn2 as mA (Alarm 2, main alarm)
I1 Response valueIΔn1 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 delayton1 (K1)
Response delay ton2 (K2)
Starting delay t
Delay on release toff (K2)
M Fault memory active
Relay operating mode K2
Password protection enabled
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LINETRAXX® RCM420
4 2 Function of the operating elements
Operating elementes
AL1
AL2
Element Function
ON, green LED ON lighting continuously: Power On
Flashing LED ON: System fault or connection monitoring fault
AL1, yellow LED AL 1 lights: Response value 1 reached (IΔn1)
AL2, yellow LED AL 2 lights: Response value 2 reached (IΔn2)
TTest button (> 1.5 s): To indicate the available display elements,
to start a self test
R Reset button (> 1.5 s): Deleting the fault memory
Up/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.
4 3 Menu structure
All adjustable parameters are listed in the columns ‘menu item’ and ‘adjustable 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 Activation Adjustable parameter
>I2 - (HI) IΔn2 (alarm2, main alarm )
>I1 - (HI) IΔn1 as % of IΔn2 (alarm 1, prewarning)
AL
(response
values)
Hys - Hysteresis IΔn1 / IΔn2
RCM420_D0005 _06_M_XXEN/12.2023 15

Operation and setting
Menu Sub menu Menu item Activation Adjustable parameter
M ON Fault memory
1- Operating mode K1 (n.c.)
2 - Operating mode K2 (n.c.)
RL - Reload function (memory = off )
1 Err ON Device error at K1
r1 I1 ON PrewarningIΔn1 at K1
r1 I2 OFF Main alarm IΔn2 at K1
r1 (K1: assignment
alarm category)
1 tES ON Device test
2 Err ON Device error at K2
r2 I1 OFF PrewarningIΔn1 at K2
r2 I2 ON Main alarm IΔn2 at K2
out
(output
control)
r2 (K2: assignment
alarm category)
2 tES ON Device test
t on 1 - Response delay K1
t on 2 - Response delay K2
t - Starting delay
t
(timing check)
t off - Delay on release K1/K2
I 12 HI
Selectable parameters:
High (HI),
window function (In),
low (Lo)
n 1 Transformation ratio factor for a second
external measuring current transformer
OFF Parameter setting via password
FAC - Restore factory settings
Set
(device
control))
SYS - Function blocked
InF - Display hardware and software version
HiS Clr - History memory for the first alarm
value, erasable
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LINETRAXX® RCM420
4 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 measured
value.
M
m
A
I2
mA
>
M
I1
m
A
>
In the standard mode, the currently set response values I1 and I2 can be displayed using the Up and Down
keys.
4 5 Display in menu mode
AL
out
t
SEt
InF
HiS
ESC
M
m
A
t > 1,5 s
t > 1,5 s
t > 1,5 s
t < 1,5 s
t < 1,5 s
ESC
Parameter query and setting: overview
Menu item Adjustable parameter
AL
Response values query and setting
•Residual currentI2 (IΔn2) (AL2)
•Residual currentI1 (IΔn1) (AL1)
•Hysteresis of the response: % Hys
RCM420_D0005 _06_M_XXEN/12.2023 1

Operation and setting
Menu item Adjustable parameter
UT
Configuration of the fault memory and the alarm relays
•Activate/deactivate the fault memory or assign continuous mode (on/off/con)
•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).
T
Set 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 window mode (In).
•Set the correction factor nRCM (n) for additional cascaded current transformer
•Enable or disable password protection, change the password.
•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)
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LINETRAXX® RCM420
5 Parameter settings
An example is given here on how to change the alarm response value I1 (IΔn1). It is presumed that the option
overcurrent (HI) has been selected in the SEt/I 12 menu (factory setting). Proceed as follows:
1. Press the MENU/Enter key for more than 1.5 seconds. The flashing short symbol AL appears on the display.
2. Confirm with Enter. The parameter response value > I2 flashes, in addition the associated overcurrent
value > 30 mA appears.
3. Use the Down key to select the parameter response value I1. The parameter > I1 flashes, in addition the
associated percentage value for prewarning 50 % of I2 appears.
4. Confirm with Enter. The current value for prewarning appears on the flashing display.
5. Use the Up or Down key to set the appropriate prewarning value. Confirm with Enter. I1 flashes.
6. You can exit the menu by:
– pressing the Enter key for more than 1.5 seconds or
– selecting the menu item ESC and confirming with Enter
to reach the next higher level.
The currently active segments are flashing! In the figures below, the segments where device settings can be
carried out are highlighted by an oval. The menu mode can be reached by pressing the MENU key for more
than 1.5 seconds.
5 1 Response value setting for overcurrent
Increasing the response value I2 (main alarm overcurrent IΔn2)
I
2
m
A
>
I2
mA
>
I2
mA
>
I2
mA
>
Increasing the response value I1 (prewarning overcurrent IΔn1)
I
2
m
A
>
%
I
1
>
%
I
1
>
I1
%
>
I1
%
>
1x
RCM420_D0005 _06_M_XXEN/12.2023 19

Parameter settings
Setting the hysteresis of the response values IΔn1, IΔn2
I
2
mA
>
Hys
%
I
Hys
%
I
Hys
%
I
Hys
%
I
2x
5 2 Fault memory
Setting the fault memory to con mode
M M
M
M M
5 3 Alarm relays
Setting the alarm relay K1 to N/O operation (n o )
M
1 1
1 1
20 RCM420_D0005 _06_M_XXEN/12.2023