Bender RCM420 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

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

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3

Table of Contents

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

4

RCM420_D00057_02_M_ XXEN/06.2016

Table of Contents

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

5

RCM420_D00057_02_M_ XXEN/06.2016

1. Important information

1.1 How to use this manual

This manual is intended for qualified personnel working in
electrical engineering and electronics!

Always keep this manual within easy reach for future reference.

To make it easier for you to understand and revisit certain sections in this man­ual, we have used symbols to identify important instructions and information.
The meaning of these symbols is explained below:

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.

RCM420_D00057_02_M_ XXEN/06.2016

7

Important information

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: [e-mail]

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)

Fax: [phone]
E-mail: [e-mail]

Please send the devices for repair to the following address:

8

[phone]**, -785** (sales)

RCM420_D00057_02_M_ XXEN/06.2016

Important information

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

RCM420_D00057_02_M_ XXEN/06.2016

9

Important information

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 Standard­Software 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 de­liveries, modifications and changes to general delivery conditions for prod­ucts and services in the electrical industry) set out by the ZVEI (Zentralverband
Elektrotechnik- und Elektronikindustrie e. V.) (German Electrical and Electron­ic Manufacturer's Association) also applies.
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 tem­peratures can be ensured.

10

RCM420_D00057_02_M_ XXEN/06.2016

Important information

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 follow­ing 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.

RCM420_D00057_02_M_ XXEN/06.2016

11

Important information

1.7 Disposal

Abide by the national regulations and laws governing the disposal of this de­vice. Ask your supplier if you are not sure how to dispose of the old equip­ment.
The directive on waste electrical and electronic equipment (WEEE directive)
and the directive on the restriction of certain hazardous substances in electri­cal and electronic equipment (RoHS directive) apply in the European Commu­nity. 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.

12

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

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.

If the device is used outside the Federal Republic of Germany, the applicable
local standards and regulations must be complied with. The European stand­ard EN 50110 can be used as a guide.

RCM420_D00057_02_M_ XXEN/06.2016

13

Safety instructions

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 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 I
between prewarning and alarm (I

I

).

Δn2

= 50…100 % of the set response value

Δn1

Δn1

and I

allow to distinguish

Δn2

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.

14

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 Us is applied, the starting delay "t" is activated. Mea­sured 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 t
piry of the response delay t

on1/2,

the selected alarm relay switches and the

on1/2

alarm LEDs light. If the release value is not reached before the expiry of t
alarm will be signalled: the LEDs AL1, AL2 do not light and the alarm relays do
not switch. The set release time t

begins when the measured value again

off

falls below the release value (response value plus hysteresis) after the swit­ching of the alarm relays. After the expiry of t

off,

to their initial position. With the fault memory activated, the alarm relays do

starts running. After the ex-

, no

on

the alarm relays switch back

not change their actual state until the reset button R is pressed. The device

RCM420_D00057_02_M_ XXEN/06.2016

15

Function

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 re­turn to their initial position, provided that the fault memory M is deactivated.
With the fault memory activated, K1/K2 return to their initial position by pres­sing the reset button R. A second cascaded measuring current transformer
will not be monitored.

3.2.2 Additional cascaded measuring current transformer

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 n

in the SEt menu. Refer to page 21

RCM

and page 34.

3.2.3 Fast response value query

With the display in standard mode, the currently measured response values

I

Δn1

and I

can be queried pressing the Up and Down keys ( < 1.5 s). Switcho-

Δn2

ver to the Menu mode is not required. If you want to exit the fast response va­lue 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 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.

3.2.5 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.

16

RCM420_D00057_02_M_ XXEN/06.2016

Function

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 monito­red, with the fault memory M deactivated, the alarm relays would switch syn­chronously to the error status.
RL in the out menu can be used to limit the number of these changeover
processes. As soon as the preset number of switching cycles is exceeded, the
fault memory will come on and an activated alarm remains stored.

3.2.8 Assigning alarm categories to alarm relays K1/K2

The alarm categories device error, residual current I
device test can be assigned to the alarm relay via the "out" menu.

3.2.9 Time delays t, t

The times t, ton and t

described below, delay the output of alarms via LEDs

off,

on

and t

off

and relays.

, residual current I

Δn1

Δn2

or

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 t

If the response value is exceeded or not reached, the residual current monitor

on1/2

requires the response time t
is signalled. A set response delay t
operating time t

and delays alarm signalling (total delay time tan = tae + ton).

ae

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.

RCM420_D00057_02_M_ XXEN/06.2016

. After the expiry of the response time an alarm

an

(0…10 s) adds up to the device-related

on1/2

17

Function

Delay on release t

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.

off

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 me­ans of the reset button R.

18

RCM420_D00057_02_M_ XXEN/06.2016

4. Installation and connection

90 mm

45

67,5

36 mm

31,1

47,5

70,5

1

2

3

100 mm

116 mm

Zubehör/
Accessory

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.

Dimension diagram, drawing for screw mounting, push-wire ter­minal connection

RCM420_D00057_02_M_ XXEN/06.2016

19

Installation and connection

k

l

T/R

11 1412

21 2422

A2A1

T/R

Load

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 bey­ond the enclosure. Then fix the device using two M4 screws.

2. Wiring
Connect the device according the wiring diagram.

Ter mi nal Con nec tio ns

A1, A2

Connection to supply voltage U

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

20

RCM420_D00057_02_M_ XXEN/06.2016

s

Installation and connection

Load

BENDER
W..., WR..., WS...

X

1

(x A/10 A)

(x A/5 A)
(x A/1 A)

n

RCM

=

X

1

X

2

X

2

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.

Example:
An additionally cascaded transformer on the load side has a transmission ratio
of X
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
n
The correction factor can be set via the SEt/n menu. Refer to page 34.

The correction factor is factory set to 1 and relates to normal operation with
one Bender measuring current transformer only (X = 600:1).

= 100 (500 A / 5 A). That means, when the lowest value of 10 mA is set at

1

= X1:X2 = 100:10 = 10.

RCM

RCM420_D00057_02_M_ XXEN/06.2016

21

Installation and connection

22

RCM420_D00057_02_M_ XXEN/06.2016

5. Operation and setting

5.1 Display elements

A detailed description of the meaning of the display elements is given in the
table below.

Display elements

Ele-

Function

ment

RL Reload function with memory = off

(L = I.)

n Transformation ratio factor for a

second external measuring current
transformer.

I2 Response value I

Δn2

as mA

(Alarm 2)

I1 Response value I

as % of I

Δn1

Δn2

(Alarm 1, prewarning.)

r1, 1
r2, 2

Alarm relay K1
Alarm relay K2

I Hys, %Response value hysteresis as %.

RCM420_D00057_02_M_ XXEN/06.2016

ton1,
ton2,

t,

toff

Response delay t
Response delay t
Starting delay t,

Delay on release t

M fault memory active

Relay operating mode K2

Password protection enabled

on1

on2

off

(K1)
(K2)

for K2

23

5.2 Function of the operating elements

ON AL1 AL2

T MENUR

Operation and setting

Device front

Ele-

Function

ment

ON,

green

lights continuously: Power On LED
flashes:
System fault or connection monito­ring fault

AL1,

LED Alarm 1 lights (yellow):
Response value 1 reached

AL2

LED Alarm 2 lights (yellow): Res­ponse value 2 reached

13 mAM13 mA flow through

the measuring current transformer,
fault memory active

T, Test button (> 1.5 s):

To indicate the available display ele-

(I

(I

Δ

n2

)

Δ

n1

)

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.

24

RCM420_D00057_02_M_ XXEN/06.2016

Operation and setting

5.3 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.

Sub

Menu

Menu

Menu

item

> I2 - (HI) I

AL

> I1 - (HI) I

(response -

values)

Hys - Hysteresis I

M ON Fault memory

1 - Operating mode K1 (n.c.)
2 - Operating mode K2 (n.c.)

RL - Reload function (memory =

out

(output con-

r1

(K1: (assign-

1 Err ON Device error at K1
r1 I1 ON Prewarning I

Activati

on

Adjustable parameter

(Alarm 2)

Δn2

as % of I

Δn1

Δn2

(Alarm 1, prewarning)

Δn1

/ I

Δn2

off)

at K1

Δn1

trol)

ment alarm

category)

r2

(K2: (assign-

ment alarm

category)

t

(timing

check)

RCM420_D00057_02_M_ XXEN/06.2016

r1 I2 off Alarm I

Δn2

at K1

1 tES ON Device test

2 Err ON Device error at K2
r2 I1 off Prewarning I

r2 I2 ON Alarm I

Δn2

at K2

Δn1

at K2

2 tES ON Device test

t on 1 - Response delay K1
t on 2 - Response delay K2

t-Starting delay

t off - Delay on release K1/K2

25

Operation and setting

Menu

Set

(device con-

trol)

InF

Sub

Menu

Menu

Activati

Adjustable parameter

item

on

I 12 HI Selectable parameters:

High, window function, low

n 1 Transformation ratio factor

for a second external
measuring current transfor­mer.

off Parameter setting via pass-

word

FAC - Re-establish factory set-

tings

SYS - Function blocked

- Display hard / software ver­sion

HiS

Clr - History memory for the first

alarm value, erasable

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 measured value.

In the standard mode, the currently set response values I 1
and
I 2 can be displayed using the Up and Down keys.

26

RCM420_D00057_02_M_ XXEN/06.2016

Operation and setting

5.5 Display in menu mode

5.5.1 Parameter query and setting: Overview

Menu

item

AL

out

t

Adjustable parameter

Response values query and setting:

– Residual current I2 (I
– Residual current I1 (I

Δn2
Δn1

) (AL2)
) (AL1)

– Hysteresis of the response values: % Hys

Configuration of the fault memory and the alarm relays:

– Activating/deactivating 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 (I

Δn1

) or I2 (I

), relay test

Δn2

or device error individually to K1/K2 (1, r1/ 2, r2).

Set delays:

– Response delay t

on1/ton2

– Starting delay t

SEt

InF

HiS

– Delay on release t

(LED, relay)

off

Device control parameter setting:

– Select the appropriate parameter for response values:

overcurrent mode (HI), undercurrent mode (Lo) or win-

dow mode (In).
– Set the correction factor n

ded current transformer.
– Enable or disable password protection, change the pass-

word.
– Re-establish factory settings.
– Service menu SyS blocked

Query hard and software version
Query the first stored alarm value.

(n) for additional casca-

RCM

RCM420_D00057_02_M_ XXEN/06.2016

27

Operation and setting

t < 1,5 s

t >1,5 s

t > 1,5 s

t > 1,5 s

t < 1,5 s

AL
out
t
SEt
InF
HiS
ESC

ESC

ESC

Move to the next higher menu level (back)

Menu structure

28

RCM420_D00057_02_M_ XXEN/06.2016

Operation and setting

Parameter settings

The following description is based on the fact that the device is in the stan­dard mode and that the measured value of the residual current is being indi­cated, refer to page 26.
An example is given here on how to change the alarm response value I1 (I

Δn1

It is presumed that the option overcurrent (HI) has been selected in the SEt/I
12 menu (factory setting). Proceed as follows:

1. To access the menu mode, 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 > I 2 flashes, in addi­tion the associated overcurrent value > 30 mA appears.

3. Use the Down key to select the parameter response value I 1. The para­meter I 1 flashes, in addition the associated percentage value for
prewarning 50 % of I 2 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 response value. Confirm
with Enter. I 1 flashes.

6. You can exit the menu by:
– Pressing the Enter key for more than 1.5 seconds to reach the next

).

higher level 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.

5.5.2 Changeover from overcurrent to undercurrent mode or to
window mode

The operating mode can be changed in the SEt/I 12 menu using the parame­ters HI, Lo and In. By default, overcurrent operation (HI) is set. Refer to page 34
for a detailed description on how to change over to the window mode.

RCM420_D00057_02_M_ XXEN/06.2016

29

5.5.3 Response value setting for overcurrent:

1x

2x

Operation and setting

- Response value I2 (overcurrent I

- Response value I1 (overcurrent I

- Hysteresis (Hys) of the response values I

Δn2

Δn1

)

)

, I

Δn1

Δn2

Increasing the response value I2 (alarm overcurrent)

Increasing the response value I1 (prewarning overcurrent).

Setting the hysteresis of the response value

5.5.4 Setting the fault memory and alarm relay operating mode

30

RCM420_D00057_02_M_ XXEN/06.2016

Operation and setting

1x

2x
>1,5 s

3x

Setting the fault memory to con mode

Setting the alarm relay K1 to N/O operation (n.o.)

Setting the number of reload cycles

5.5.5 Assigning alarm categories to the alarm relays

Overcurrent, undercurrent and device-related errors of the residual current
monitor can be assigned to the alarm relays K1 (r1, 1) and K2 (r2, 2). By default,
the alarm relays K1 and K2 signal prewarning and alarm in case of overcurrent
and device-related errors.

RCM420_D00057_02_M_ XXEN/06.2016

31

Operation and setting

3x
>1,5 s

4x

4x

3x
>1,5 s

1x

4x

3x
>1,5 s

2x

Alarm relay K1: Deactivating the category device error

Alarm relay K1: Deactivating the category response value I1

Alarm relay K1: Activating the category response value I2

32

RCM420_D00057_02_M_ XXEN/06.2016

Operation and setting

4x

3x
>1,5 s

3x

Alarm relay K1: Deactivating the category "Alarm by device test"

When an alarm relay (K1/K2) has been deactivated in the
menu, an alarm will not be signalled by the respective
changeover contact! An alarm will only be indicated by the
respective alarm LED (AL1/AL2)!

5.5.6 Set the time delays

The following delays can be set:

 Response delay t
 Starting delay t (0…10 s) when the device is being started
 Common delay on release t

only relevant when the fault memory M is deactivated.

The operating steps for the setting of the response delay t
delay t are illustrated by way of example.

(0…10 s) for K1, and t

on1

(0…300 s) for K1, K2. The setting t

off

(0…10 s) for K2

on2

on1

and the starting

off

is

RCM420_D00057_02_M_ XXEN/06.2016

33

Operation and setting

2x
>1,5 s

2x
>1,5 s

2x

2x
>1,5 s

Setting the response delay t

Setting the starting delay t

on1

5.5.7 Changing from overcurrent operation to window
operation

Use this menu item to set whether the response values of the device apply to
overcurrent (HI) or undercurrent operation (Lo). In addition, window operati­on (In) can be selected.

5.5.8 Setting the correction factor for an additional cascaded

34

RCM420_D00057_02_M_ XXEN/06.2016

Operation and setting

2x
>1,5 s

1x

2x
>1,5 s

2x

current transformer

Factory setting without cascaded transformer: n = 1.

5.5.9 Factory setting and password protection

Use this menu to activate the password protection, to change the password
or to deactivate the password protection. In addition, you can reset the device
to its factory settings.

a) Activating the password protection

RCM420_D00057_02_M_ XXEN/06.2016

35

b) Changing the password

2x
>1,5 s

2x

2x
>1,5 s

2x

3x

....

c) Deactivating the password protection

Operation and setting

5.5.10 Re-establishing the factory settings

36

RCM420_D00057_02_M_ XXEN/06.2016

Operation and setting

.... ....

5.5.11 Device information query

This function is used to query the software (1.xx) versions. After activating this
function, data will be displayed as a scrolling text. Once one pass is completed
you can select individual data sections using the Up/Down keys.

5.5.12 History memory query

The history memory can be selected via the menu HiS. Use the Up and Down
keys to view the next display. If Clr is flashing, the history memory can be cle­ared by pressing the Enter key.

5.6 Commissioning

Prior to commissioning, check proper connection of the residual current mo­nitor.

5.7 Factory setting

Response value overcurrent I1
(prewarning)
Response value overcurrent I2 (alarm)
Hysteresis:
Fault memory M:
Operating mode K1/K2
Starting delay:
Response delay:

Delay on release:
Transformer correction factor n (n

RCM

Password:

)

15 mA (50 % of I2)
30 mA
15 %
activated (on)
N/C operation (n.c.)
t = 0.5 s
t

= 1 s

on1

t

= 0 s

on2

t

= 1 s

off

1
0, deactivated (Off)

RCM420_D00057_02_M_ XXEN/06.2016

37

Operation and setting

5.8 Error codes

Should, contrary to all expectations, a device error occur, error codes will ap­pear on the display. Typical error codes are described below:

Error

Meaning:

code

E.01 Fault CT connection monitoring

Appropriate action: Check CT connection for short-circuit or
interruption. After eliminating the fault, the error code will be
automatically deleted.

E.02 Fault CT connection monitoring during manual self test.

Appropriate action: Check CT connection for short-circuit or
interruption. After eliminating the fault, the error code will be
automatically deleted.

E…. Appropriate action when error codes > 02 occur:

Carry out a reset. Reset the device to factory setting. After elimi­nating the fault, the error code will be automatically deleted. If
the fault continues to exist, please contact the Bender Service.

38

RCM420_D00057_02_M_ XXEN/06.2016

Technical data

6. Technical data

6.1 Data in tabular form

( )* = factory setting

Insulation coordination acc. to IEC 60664-1/IEC 60664-3

RCM420-D-1:

Rated insulation voltage .................................................................................................................100 V

Overvoltage category/pollution degree.............................................................................................III/3

Rated impulse voltage ................................................................................................................... 2,5 kV

RCM420-D-2:

Rated insulation voltage ................................................................................................................ 250 V

Overvoltage category/pollution degree.............................................................................................III/3

Rated impulse voltage....................................................................................................................... 4 kV

Supply voltage

RCM420-D-1:

Supply voltage range U
Operating range U
Frequency range U

.......................................................................... AC 24…60 V / DC 24…78 V

s

................................................................................. AC 16…72 V / DC 9.6…94 V

s

..................................................................................................... DC, 42…460 Hz

s

RCM420-D-2:

Supply voltage range U
Operating range U
Frequency range U

......................................................................................... AC/DC 100…250 V

s

................................................................................................... AC/DC 70…300 V

s

........................................................................................................... 42…460 Hz

s

Protective separation (reinforced insulation) between................... (A1, A2) - (k/l, T/R) - (11, 12, 14) - (21, 22, 24)

Voltage test according to IEC 61010-1 ............................................................................................................... 2.21 kV

Power consumption ............................................................................................................................................ ≤ 4 VA

Measuring circuit

External measuring current transformer type............................................................................ W…, WR…, WS…

Load...........................................................................................................................................................................68 Ω

Rated insulation voltage (measuring current transformer) .................................................................................800 V

Operating characteristic acc. to IEC 62020............................................................................................................type A

Frequency range ..................................................................................................................................... 42…2000 Hz

Measuring range ....................................................................................................................................... 3 mA…16 A

RCM420_D00057_02_M_ XXEN/06.2016

39

Technical data

Relative uncertainty.................................................................................................................................... 0 … -20 %

Operating uncertainty .................................................................................................................................... 0…30%

Response values

Rated residual operating current I
Rated residual operating current I

(prewarning, AL1) .............................................50…100 % x I

Δn1

(Alarm, AL2) ............................................................ 10 mA…10 A (30 mA)*

Δn2

, (50 %)*

Δn2

Hysteresis ....................................................................................................................................... 10…25 % (15%)*

Specified time

Starting delay t ................................................................................................................................... 0…10 s (0.5 s)*

Response delay t
Response delay t
Delay on release t
Operating time t
Operating time t
Response time t

(Alarm) ................................................................................................................ 0…10 s (0 s)*

on2

(prewarning) ....................................................................................................... 0…10 s (1 s)*

on1

............................................................................................................................ 0…300 s (1 s)*

off

at IΔn = 1 x I

ae

at IΔn = 5 x I

ae

.............................................................................................................................. tan = tae + t

an

............................................................................................................ ≤ 180 ms

Δn1/2

.............................................................................................................. ≤ 30 ms

Δn1/2

on1/2

Recovery time tb ............................................................................................................................................. ≤ 300 ms

Number of reload cycles .......................................................................................................................... 0…100 (0)*

Cable lengths for measuring current transformers

Single wire ≥ 0.75 mm
Single wire, twisted ≥ 0.75 mm
Shielded cable ≥ 0.75 mm

2

................................................................................................................................. 0…1 m

2

................................................................................................................. 0…10 m

2

.......................................................................................................................... 0…40 m

Recommended cable

(shielded, shield on one side connected to terminal l of the RCM420, not connected to earth) ..................................

........................................................................................................................................................ J-Y(St)Y min. 2 x 0.8

Connection ..............................................................................................................................................screw terminals

Displays, memory

Display range, measured value ................................................................................................................ 3 mA…16 A

Error of indication .............................................................................................................................± 15 % / ± 2 digit

Measured-value memory for alarm value ..................................................................... data record measured values

Password ...................................................................................................................................... off / 0…999 (OFF)*

Fault memory alarm relay ........................................................................................................................on / off (off)*

Inputs/outputs

Cable length for external test / reset button...................................................................................................0…10 m

40

RCM420_D00057_02_M_ XXEN/06.2016

Switching elements

Number of switching elements ............................................................................................. 2 x 1 changeover contact

Operating principle ...........................................................................N/C operation/ N/O operation (N/O operation)*

Electrical service life under rated operating conditions.................................................... 10000 switching operations

Contact data acc. to IEC 60947-5-1:
Utilization category AC-13 AC-14 DC-12 DC-12 DC-12
Rated operational voltage 230 V 230 V 24 V 110 V 220 V
Rated operational voltage UL 200 V 200 V 24 V 110 V 200 V
Rated operational current 5 A 3 A 1 A 0.2 A 0.1 A

Minimum contact load..............................................................................................................1 mA at AC / DC ≥ 10 V

Environment/EMC

EMC .................................................................................................................................................................. IEC 62020

Operating temperature ...................................................................................................................... -25 ºC…+55 °C

Classification of climatic conditions IEC 60721

Stationary use (IEC 60721-3-3) ........................................................3K5 (except condensation and formation of ice)

Transportation (IEC 60721-3-2) ........................................................2K3 (except condensation and formation of ice)

Storage (IEC 60721-3-1) ...................................................................1K4 (except condensation and formation of ice)

Classification of mechanical conditions acc. to IEC 60721:

Stationary use (IEC 60721-3-3) .............................................................................................................................. 3M4

Transportation (IEC 60721-3-2) ..............................................................................................................................2M2

Storage (IEC 60721-3-1) ......................................................................................................................................... 1M3

Option "W" data different from the standard version

Classification of climatic conditions acc. to IEC 60721:

Stationary use (IEC 60721-3-3) ................................................. 3K5 (condensation and formation of ice is possible)

Classification of mechanical conditions acc. to IEC 60721:

Stationary use (IEC 60721-3-3) ............................................................................................................................. 3M7

Connection

For UL application................................................................................................use 60/70 °C copper conductors only

Connection type.......................................................................................................... screw-type terminals

Connection properties:

rigid/ flexible/ conductor sizes ................................................................. 0.2…4 / 0.2…2.5 mm

RCM420_D00057_02_M_ XXEN/06.2016

2

/ AWG 24…12

41

Technical data

Multi-conductor connection (2 conductors with the same cross section):

rigid, flexible........................................................................................................................0.2…1.5 / 0.2…1.5 mm

Stripping length ............................................................................................................................................ 8…9 mm

Tightening torque.................................................................................................................................... 0.5…0.6 Nm

Connection type............................................................................................................ push-wire terminals

Connection properties:

Rigid .......................................................................................................................... 0.2…2.5 mm

Flexible without ferrules......................................................................................... 0.75…2.5 mm

Flexible with ferrules................................................................................................. 0.2…1.5 mm

2

( AWG 24…14)

2

( AWG 19…14)

2

( AWG 24…16)

Stripping length .................................................................................................................................................. 10 mm

Opening force........................................................................................................................................................... 50 N

Test opening, diameter....................................................................................................................................... 2.1 mm

Other

2

Operating mode ........................................................................................................................... continuous operation

Position of normal use................................................................................................................................................any

Protection class, internal components (DIN EN 60529) ......................................................................................... IP 30

Degree of protection, terminals (DIN EN 60529).................................................................................................... IP 20

Enclosure material ....................................................................................................................................polycarbonate

Flammability class .............................................................................................................................................UL94V-0

DIN rail mounting acc. to.................................................................................................................................IEC 60715

Screw mounting................................................................................................................... 2 x M4 with mounting clip

Weight ............................................................................................................................................................... ≤ 150 g

( )* = factory setting

6.2 Standards, approvals and certifications

42

RCM420_D00057_02_M_ XXEN/06.2016

Technical data

6.3 Ordering information

RCM420-D-1 RCM420-D-2

Response range IΔn

Rated frequency

Measuring current
transformers

Supply voltage Us*

Art. No.:

(B 7… = push-wire
terminal)

W…, WR…, WS… series W…, WR…, WS… series

AC 42…460 Hz, 16…72 V

*Absolute values of the voltage range

10 mA…10 A 10 mA…10 A

42…2000 Hz 42…2000 Hz

DC 9.6 V…94 V /

B 7401 4001

B 9401 4001
B 7401 4001W
B 9401 4001W

External measuring current transformers

Type Inside diameter (mm) Art. No.

DC 70…300 V /

AC 42…460 Hz,

70…300 V

B 7401 4002
B 9401 4002

W20 20 B 9808 0003
W35 35 B 9808 0010

W60 60 B 9808 0018
W120 120 B 9808 0028
W210 210 B 9808 0034

WR70x175 70 x 175 B 9808 0609

WR115x305 115 x 305 B 9808 0610

WS50x80 50 x 80 B 9808 0603

WS80x120 80 x 120 B 9808 0606

RCM420 accessories

Mounting clip for screw fixing (1 piece per device) ................................................................................. B 9806 0008

Measuring current transformers accessories

Snap-on mounting for DIN rail: W20… /W35… ................................................................................. B 9808 0501

Snap-on mounting for DIN rail: W60 .........................................................................................................B 9808 0502

RCM420_D00057_02_M_ XXEN/06.2016

43

Technical data

44

RCM420_D00057_02_M_ XXEN/06.2016

INDEX

A

Adjustable parameters, list 25

Automatic self test

C

Connection of an additional cascaded

measuring current transformer

Continuous mode (con), fault memory

D

Delay on release toff 18

Deleting the fault alarms
Device features
Display elements
Display in standard mode

16

21

24

15

23

26

18

I

Installation and connection 19

Intended use

K

K1/K2: assignment alarm category 25

L

LED Alarm 1 lights 24

LED Alarm 2 lights

M

Manual self test 16

Menu

- AL (response values)

14

24

25

E

ENTER key 24

Example of parameter setting

F

Factory setting 18, 37

Function
Functional faults

H

How to use this manual 7

15

17

29

- HiS (history memory for the first
alarm value)

- InF (hard and software version)

- out (output control)

- Set (device control

- t (timing check)

Menu structure, overview

O

Operating elements, function 24

Operation and setting
Ordering information

26

25

26

25

25

23

43

26

RCM420_D00057_02_M_ XXEN/06.2016

45

P

Starting delay t 17

Parameter query and setting, overview 27

Parameter setting

- Activating or deactivating the pass­word protection

- Assigning alarm categories to the
alarm relays

- Changing from overcurrent opera­tion to window operation

- Set response values

- Set the time delays

- Setting the fault memory to con
mode

31

Password protection

R

35

31

34

30

33

18

Starting the menu mode
Support

T

Technical data 39

Test button
Training courses

W

Wiring diagram 20

Wondow mode
Work activities on electrical installations
workshops

8

24

10

34

10

24

13

Reset button 24

Residual current monitoring in window

discriminator mode

Response delay ton

S

Second external measuring current trans-

former

Select the appropriate parameter for res-

ponse values
Service
Set response values

- Hysteresis

- Overcurrent (> I)

Set the correction factor for additional cas-

16

27

8

30

18

17

30

caded current transformer.
Setting the number of reload cycles

46

34

31

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

Photos: Bender archives

BENDER Group