Bender cme420 User manual

Manual EN
CME420
Multi-functional current relay, AC,
overcurrent/undercurrent/
window discriminator function
CME420_D00034_03_M_XXEN/08.2020

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

Table of Contents
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CME420_D00034_03_M_XXEN/08.2020
1. Important information .................................................................................... 5
1.1 How to use this manual ................................................................................. 5
1.2 Technical support: service and support ................................................... 6
1.2.1 First level support ............................................................................................. 6
1.2.2 Repair service ..................................................................................................... 6
1.2.3 Field service ........................................................................................................ 7
1.3 Training courses ................................................................................................ 8
1.4 Delivery conditions .......................................................................................... 8
1.5 Inspection, transport and storage .............................................................. 8
1.6 Warranty and liability ...................................................................................... 9
1.7 Disposal ............................................................................................................ 10
2. Safety instructions ......................................................................................... 11
2.1 General safety instructions ........................................................................ 11
2.2 Work activities on electrical installations ............................................. 11
2.3 Intended use ................................................................................................... 12
2.4 Information about factory setting .......................................................... 12
3. Function ........................................................................................................... 13
3.1 Device features .............................................................................................. 13
3.2 Function ............................................................................................................ 13
3.2.1 Automatic self test ........................................................................................ 14
3.2.2 Manual self test .............................................................................................. 14
3.2.3 Malfunction ..................................................................................................... 14
3.2.4 Specify the number of reload cycles ...................................................... 15
3.2.5 Erasable history memory ............................................................................ 15
3.2.6 Assigning alarms to the alarm relays K/1K2 ........................................ 15
3.2.7 Residual current monitoring in window discriminator mode ...... 15
3.2.8 Time delays t, ton and toff ......................................................................... 16

Table of Contents
4CME420_D00034_03_M_XXEN/08.2020
3.2.9 Password protection (on, OFF) ................................................................. 16
3.2.10 Factory setting FAC ...................................................................................... 16
3.2.11 Display accuracy ............................................................................................ 16
4. Installation and connection ......................................................................... 17
5. Operation and setting .................................................................................. 19
5.1 Used display elements ................................................................................. 19
5.2 Function of the operating elements ...................................................... 20
5.3 Menu structure ............................................................................................... 21
5.4 Display in standard mode ......................................................................... 22
5.5 Display in menu mode ................................................................................ 23
5.5.1 Parameter query and setting: overview ................................................ 23
5.5.2 Switching over from overcurrent to undercurrent operation
or to window operation .............................................................................. 25
5.5.3 Response value setting for overcurrent: ............................................... 26
5.5.4 Setting the fault memory and operating principle of the alarm
relays .................................................................................................................. 27
5.5.5 Assigning alarm categories to the alarm relays ................................. 28
5.5.6 Setting the time delays ............................................................................... 30
5.5.7 Changing from overcurrent operation to window operation ...... 31
5.5.8 Setting the transformation ratio for external current
transformer ...................................................................................................... 32
5.5.9 Re-establishing the factory settings ....................................................... 34
5.5.10 History memory query ................................................................................. 34
5.6 Commissioning .............................................................................................. 35
5.7 Factory setting ............................................................................................... 35
5.8 Timing diagram: Current monitoring ..................................................... 36
6. Technical data ................................................................................................ 37
6.1 Data in tabular form ..................................................................................... 37
6.2 Standards, approvals and certifications ................................................ 40
6.3 Ordering information ................................................................................... 41

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CME420_D00034_03_M_XXEN/08.2020
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
6CME420_D00034_03_M_XXEN/08.2020
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers you:
1.2.1 First level support
Technical support by phone or e-mail for all Bender products
 Questions concerning specific customer applications
 Commissioning
 Troubleshooting
Telephone: [phone]*
Fax: [phone]
In Germany only: 0700BenderHelp (Tel. and Fax)
E-mail: [email protected]
1.2.2 Repair service
Repair, calibration, update and replacement service for Bender products
 Repairing, calibrating, testing and analysing Bender products
 Hardware and software update for Bender devices
 Delivery of replacement devices in the event of faulty or incorrectly
delivered Bender devices
 Extended guarantee for Bender devices, which includes an in-house
repair service or replacement devices at no extra cost
Telephone: [phone]** (technical issues)
[phone]**, -785** (sales)
Fax: [phone]
E-mail: [email protected]
Please send the devices for repair to the following address:
Bender GmbH, Repair-Service,
Londorfer Str. 65,
35305 Grünberg

Important information
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CME420_D00034_03_M_XXEN/08.2020
1.2.3 Field service
On-site service for all Bender products
 Commissioning, configuring, maintenance, troubleshooting of Bender
products
 Analysis of the electrical installation in the building (power quality test,
EMC test, thermography)
 Training courses for customers
Telephone: [phone]**, -762 **(technical issues)
[phone]** (sales)
Fax: [phone]
E-mail: [e-mail]
Internet: www.bender.de
*Available from 7.00 a.m. to 8.00 p.m. 365 days a year (CET/UTC+1)
**Mo-Thu 7.00 a.m. - 8.00 p.m., Fr 7.00 a.m. - 13.00 p.m

Important information
8CME420_D00034_03_M_XXEN/08.2020
1.3 Training courses
Bender is happy to provide training regarding the use of test equipment.
The dates of training courses and workshops can be found on the Internet at
www.bender.de -> Know-how -> Seminars.
1.4 Delivery conditions
Bender sale and delivery conditions apply.
For software products the "Softwareklausel zur Überlassung von Standard-
Software als Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen
Lieferbedingungen für Erzeugnisse und Leistungen der Elektroindustrie"
(software clause in respect of the licensing of standard software as part of de-
liveries, modifications and changes to general delivery conditions for 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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CME420_D00034_03_M_XXEN/08.2020
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
10 CME420_D00034_03_M_XXEN/08.2020
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 -> Service & support.

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CME420_D00034_03_M_XXEN/08.2020
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
12 CME420_D00034_03_M_XXEN/08.2020
2.3 Intended use
The current monitor is designed to monitor the threshold values of AC cur-
rents for overcurrent and undercurrent conditions. In case of direct measure-
ment, currents up to 16 A (screw-type terminals) resp. 12 A (push-wire
terminals) can be continuously monitored. For indirect measurement by me-
ans of a current transformer, a transformation ratio factor up to 2000 can be
set. The device allows pure overcurrent and pure undercurrent operation, as
well as window operation between two adjustable response values. The de-
vice is factory set to overcurrent operation.
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.
2.4 Information about factory setting
The page 35 provides a summary of all factory settings.
If you want to reset the current monitor to factory settings refer to page 34.

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CME420_D00034_03_M_XXEN/08.2020
3. Function
3.1 Device features
 Undercurrent or overcurrent monitoring in AC systems, < I or > I and
current monitoring with window discriminator function
 Indirect current monitoring by means of a current transformer,
suitable for transformation ratio factor 1…2000
 Adjustable switching hysteresis
 r.m.s. value measurement AC
 Continuous self monitoring
 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
 Fault memory behaviour selectable
 Password protection against unauthorized parameter changing
 Sealable transparent cover
 Two-module enclosure (36 mm)
 With push-wire terminals: two terminals per connection
3.2 Function
Once the supply voltage is applied, the starting delay "t" is activated. Measu-
red values changing during this time do not influence the switching state of
the alarm relays.
The devices provide two separately adjustable measuring channels (overcur-
rent/undercurrent). When the measured value exceeds (ALARM 1) resp. drops
below (ALARM 2) the adjusted threshold value, the time of the response de-
lays "ton 1/2" begins. After the expiry of the response delay, the alarm relays
switch and the alarm LEDs light. If the measured value falls below or exceeds
the adjusted delay on release (response value plus hysteresis) after the alarm

Function
14 CME420_D00034_03_M_XXEN/08.2020
relays have switched, the delay on release starts "toff". After the expiry of "toff“,
the alarm relays switch back to their initial position. With activated fault me-
mory, the alarm relays do not change their actual state until the reset button
R is pressed.
3.2.1 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 or connection faults will be determined and will appear in form of an
error code on the display. The alarm relays are not checked during this test.
3.2.2 Manual self test
After pressing the internal test button for > 1.5 s, aself test is performed by the
device. During this test, internal malfunctions will be determined and appear
in form of an error code on the display. The alarm relays are not checked du-
ring this test.
While the test button T is pressed and held down, all device-related display
elements appear on the display.
3.2.3 Malfunction
In the event of an internal malfunction, all three LEDs flash. An error code ap-
pears on the display (E.02…E.32).
If the fault continues to exist, please contact the Bender Service.
Error code Meaning Action
E.02 Fault occured
during manual
self test
Check device connection. After eliminating
the fault, the error code will be automati-
cally deleted.
E.03…E.32 Carry out a reset. Reset the device to fac-
tory setting. After eliminating the fault, the
error code will be automatically deleted.

Function
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CME420_D00034_03_M_XXEN/08.2020
3.2.4 Specify the number of reload cycles
If faults occur only temporarily, but recurrently, in the system being monito-
red, with deactivated fault memory M, the alarm relays would switch synchro-
nously to the error status.
RL in the out menu can be used to limit the number of these changeover pro-
cesses. As soon as the specified number of processes is exceeded, the fault
memory will come on and an activated alarm remains stored.
3.2.5 Erasable history memory
The first alarm value that occurs will be entered in this memory. The memory
can be cleared via the menu HiS.
3.2.6 Assigning alarms to the alarm relays K1/K2
Different alarm categories can be assigned to the alarm relays K1/K2 via the
menu "out".
3.2.7 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 31).

Function
16 CME420_D00034_03_M_XXEN/08.2020
3.2.8 Time delays t, ton and toff
The times t, ton and toff described below delay the output of alarms via LEDs
and relays.
Starting delay t
After connection to the supply voltage US, the alarm indication is delayed by
the preset time t(0…300 s).
Response delay ton1/2
If the current value exceeds or falls below the threshold value, the current mo-
nitor does not initiate an alarm before the response time tan has elapsed.
A set response delay ton1/2 (0…300 s) adds up to the device-related operating
time tae and delays alarm signalling (total delay time tan = tae + ton).
If the fault does not continue to exist before the time of the response delay has
elapsed, an alarm will not be indicated.
Release delay toff
When no alarm exists after deactivating the fault memory, the alarm LEDs will
go out and the alarm relays switch back to their initial position. After acti-
vating the release delay (0…300 s), the alarm state is continuously maintained
for the selected period.
3.2.9 Password protection (on, OFF)
With activated password protection (on), settings can only be carried out
when the correct password (0…999) has been entered.
3.2.10 Factory setting FAC
After activating the factory setting, all settings previously changed are reset to
delivery status.
3.2.11 Display accuracy
The display accuracy of the measured current values depends on the set res-
ponse values. When an alarm response value I2 of 10 A has been selected, cur-
rents smaller than 350 mA are displayed as < 0.3 A.

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CME420_D00034_03_M_XXEN/08.2020
4. Installation and connection
Dimension diagram and drawing for screw fixing
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
100 mm
116 mm
Zubehör/
Accessory

Installation and connection
18 CME420_D00034_03_M_XXEN/08.2020
The front plate cover is easy to open at the lower part identified 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 over
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 to the conductor to be monitored: directly
or by means of a current transformer
11, 12, 14 Alarm relay K1
21, 22, 24 Alarm relay K2
U
s
A1
~/
~/+
6A 6A
IT-System
A2
kl
11 1412
21 2422
A2A1
lk
L1
N
lk
L1
N

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CME420_D00034_03_M_XXEN/08.2020
5. Operation and setting
5.1 Used display elements
A detailed description of the meaning of the display elements is given in the
table below.
Used display elements Element Function
RL Reload function with memory = off
(L = I.)
nTransformation ratio factor for
external current transformer
<I
>I
Undercurrent
Overcurrent
r1, 1
r2, 2
Alarm relay K1,
Alarm relay K2
I Hys,
%
Response value hysteresis in %
ton1,
ton2,
t,
toff
Response delay ton1 (K1),
Response delay ton2 (K2)
Starting delay t,
Delay on release toff for K1, K2
MFault memory active
Operating mode of the relays K1, K2
Password protection active

Operation and setting
20 CME420_D00034_03_M_XXEN/08.2020
5.2 Function of the operating elements
Device front Element Function
ON Power On LED, green
AL1,
AL2
LED Alarm 1 lights (yellow):
Response value 1 reached
LED Alarm 2 lights (yellow): Res-
ponse value 2 reached
1,6 A,
M
I = 1.6 A flow via
the terminals k and l,
Fault memory active
T, Test button (> 1.5 s):
Indication of the display elements,
starting a self test;
Up key (< 1.5 s):
Menu items/values
R, Reset button (> 1.5 s):
Deleting the fault memory;
Down key (< 1.5 s):
Menu items/values
MENU, MENU key (> 1.5 s):
Starting the menu mode;
Enter key (< 1.5 s):
Confirm menu item, submenu item
and value.
Enter key (> 1.5 s):
Back to the next higher menu level.
ON AL1 AL2
TMENUR