Bender RCM420 Series User manual

Manual
EN
RCM420
Residual current monitor
for AC current monitoring in TN and TT systems
Software version: D240 V1.2x
RCM420_D00057_02_M_ XXEN/06.2016

Bender GmbH & Co. KG
P.O. Box 1161 • 35301 Gruenberg • Germany
Londorfer Strasse 65 • 35305 Gruenberg • Germany
Tel.: [phone] • Fax: [phone]
E-Mail: [e-mail] • 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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RCM420_D00057_02_M_ XXEN/06.2016
1. Important information .................................................................................... 7
1.1 How to use this manual ................................................................................. 7
1.2 Technical support: service and support ................................................... 8
1.2.1 First level support ............................................................................................. 8
1.2.2 Repair service ..................................................................................................... 8
1.2.3 Field service ........................................................................................................ 9
1.3 Training courses ............................................................................................. 10
1.4 Delivery conditions ....................................................................................... 10
1.5 Inspection, transport and storage ........................................................... 10
1.6 Warranty and liability ................................................................................... 11
1.7 Disposal ............................................................................................................ 12
2. Safety instructions ......................................................................................... 13
2.1 General safety instructions ........................................................................ 13
2.2 Work activities on electrical installations ............................................. 13
2.3 Intended use ................................................................................................... 14
3. Function ........................................................................................................... 15
3.1 Device features .............................................................................................. 15
3.2 Function ............................................................................................................ 15
3.2.1 Connection monitoring .............................................................................. 16
3.2.2 Additional cascaded measuring current transformer ...................... 16
3.2.3 Fast response value query ......................................................................... 16
3.2.4 Automatic self test ........................................................................................ 16
3.2.5 Manual self test .............................................................................................. 16
3.2.6 Functional faults ............................................................................................ 17
3.2.7 Set the number of reload cycles .............................................................. 17
3.2.8 Assigning alarm categories to alarm relays K1/K2 ............................ 17
3.2.9 Time delays t, ton and toff ....................................................................... 17

Table of Contents
4RCM420_D00057_02_M_ XXEN/06.2016
3.2.10 Residual current monitoring in window discriminator mode ...... 18
3.2.11 Password protection (on, OFF) ................................................................. 18
3.2.12 Factory setting FAC ...................................................................................... 18
3.2.13 Erasable history memory ............................................................................ 18
3.2.14 External, combined test respectively reset button T/R ................... 18
3.2.15 Fault memory .................................................................................................. 18
4. Installation and connection ......................................................................... 19
5. Operation and setting .................................................................................. 23
5.1 Display elements ........................................................................................... 23
5.2 Function of the operating elements ...................................................... 24
5.3 Menu structure ............................................................................................... 25
5.4 Display in standard mode .......................................................................... 26
5.5 Display in menu mode ................................................................................ 27
5.5.1 Parameter query and setting: Overview ............................................... 27
5.5.2 Changeover from overcurrent to undercurrent mode or to window
mode .................................................................................................................. 29
5.5.3 Response value setting for overcurrent: ............................................... 30
5.5.4 Setting the fault memory and alarm relay operating mode .......... 30
5.5.5 Assigning alarm categories to the alarm relays ................................. 31
5.5.6 Set the time delays ....................................................................................... 33
5.5.7 Changing from overcurrent operation to window operation ...... 34
5.5.8 Setting the correction factor for an additional cascaded current
transformer ...................................................................................................... 34
5.5.9 Factory setting and password protection ............................................ 35
5.5.10 Re-establishing the factory settings ....................................................... 36
5.5.11 Device information query .......................................................................... 37
5.5.12 History memory query ................................................................................. 37
5.6 Commissioning .............................................................................................. 37
5.7 Factory setting ............................................................................................... 37
5.8 Error codes ....................................................................................................... 38

Table of Contents
5RCM420_D00057_02_M_ XXEN/06.2016
6. Technical data ................................................................................................ 39
6.1 Data in tabular form ..................................................................................... 39
6.2 Standards, approvals and certifications ................................................ 42
6.3 Ordering information ................................................................................... 43
INDEX .................................................................................................................... 45

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RCM420_D00057_02_M_ XXEN/06.2016
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 man-
ual, we have used symbols to identify important instructions and information.
The meaning of these symbols is explained below:
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
8RCM420_D00057_02_M_ XXEN/06.2016
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.
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: [e-mail]
Please send the devices for repair to the following address:

Important information
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RCM420_D00057_02_M_ XXEN/06.2016
Bender GmbH, Repair-Service,
Londorfer Str. 65,
35305 Grünberg
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.com
*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

Important information
10 RCM420_D00057_02_M_ XXEN/06.2016
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.com -> 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 prod-
ucts and services in the electrical industry) set out by the ZVEI (Zentralverband
Elektrotechnik- und Elektronikindustrie e. V.) (German Electrical and Electron-
ic Manufacturer's Association) also applies.
Sale and delivery conditions can be obtained from Bender in printed or elec-
tronic 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.

Important information
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RCM420_D00057_02_M_ XXEN/06.2016
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 follow-
ing 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
12 RCM420_D00057_02_M_ XXEN/06.2016
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
homepage at www.bender-de.com -> Service & support.

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RCM420_D00057_02_M_ XXEN/06.2016
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 stand-
ard 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
14 RCM420_D00057_02_M_ XXEN/06.2016
2.3 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 activatedin 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 con-
nections and PE-PAS connections.
Two separately adjustable response ranges IΔn1 and IΔn2 allow to distinguish
between prewarning and alarm (IΔn1 = 50…100 % of the set response value
IΔn2).
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.

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RCM420_D00057_02_M_ XXEN/06.2016
3. Function
3.1 Device features
 AC and pulsed DC sensitive residual current monitor Type A according
to IEC 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
3.2 Function
Once the supply voltage Usis applied, the starting delay "t" is activated. Mea-
sured values exceeded during this time do not influence the switching state
of the alarm relays. Residual current monitoring takes place via an external
measuring current transformer. The currently measured value is shown on the
LC display. In this way any changes can be recognized easily, for example,
when circuits are connected to the system. If the measured value exceeds one
or both response values, the response delay ton1/2 starts running. After the ex-
piry of the response delay ton1/2, the selected alarm relay switches and the
alarm LEDs light. If the release value is not reached before the expiry of ton, no
alarm will be signalled: the LEDs AL1, AL2 do not light and the alarm relays do
not switch. The set release time toff begins when the measured value again
falls below the release value (response value plus hysteresis) after the swit-
ching of the alarm relays. After the expiry of toff, the alarm relays switch back
to their initial position. With the fault memory activated, the alarm relays do
not change their actual state until the reset button R is pressed. The device

Function
16 RCM420_D00057_02_M_ XXEN/06.2016
function can be tested using the test button T. 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 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 Additional cascaded measuring current transformer
For applications where residual currents higher than 10 A occur, a second ex-
ternal transformer can be cascaded. The transformer's transmission ratio can
be adapted using the correction factor nRCM in the SEt menu. Refer to page 21
and page 34.
3.2.3 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.
3.2.4 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.
3.2.5 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.

Function
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RCM420_D00057_02_M_ XXEN/06.2016
While the test button T is pressed and held down, all device-related display
elements appear on the display.
3.2.6 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.
3.2.7 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
processes. As soon as the preset number of switching cycles is exceeded, the
fault memory will come on and an activated alarm remains stored.
3.2.8 Assigning alarm categories to alarm relays K1/K2
The alarm categories device error, residual current IΔn1, residual currentIΔn2 or
device test can be assigned to the alarm relay via the "out" menu.
3.2.9 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 US, the alarm indication is delayed by
the preset time t (0…10 s).
Response delay ton1/2
If the response value is exceeded or not reached, the residual current monitor
requires the response time tan. 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.

Function
18 RCM420_D00057_02_M_ XXEN/06.2016
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…300 s), the alarm state is continuously maintained for
the selected period.
3.2.10 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 34.
3.2.11 Password protection (on, OFF)
When the password protection is activated (on), settings are only possible
after entering the correct password (0…999).
3.2.12 Factory setting FAC
After activating the factory setting, all settings previously changed are reset to
delivery status.
3.2.13 Erasable history memory
The first alarm value that occurs will be saved in this memory. The memory can
be cleared via the menu HiS.
3.2.14 External, combined test respectively reset button T/R
Reset = Pressing the external button < 1.5 s
Test = Pressing the external button > 1.5 s
3.2.15 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.

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RCM420_D00057_02_M_ XXEN/06.2016
4. Installation and connection
Dimension diagram, drawing for screw mounting, push-wire ter-
minal 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
90 mm
45
67,5
36 mm
31,1
47,5
70,5
1
2
3
100 mm
116 mm
Zubehör/
Accessory

Installation and connection
20 RCM420_D00057_02_M_ XXEN/06.2016
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 Us
k, l Connection of measuring current transformers
T / R Connection to the combined test and reset button
11, 12, 14 Alarm relay K1
21, 22, 24 Alarm relay K2
k
l
T/R
11 1412
21 2422
A2A1
T/R
Load