Bender CMD420-DM User manual

Manual
EN
CMD420_421-DM_D00224_01_M_XXEN/08.2016
CMD420-DM
CMD421-DM
Current monitoring device with analogue output signal
for monitoring of 3AC currents with current transformer
for overcurrent or undercurrent
or in window mode for overcurrent and undercurrent
Software version CMD420-DM: D287 V1.1x
Software version CMD421-DM: D294 V1.1x

Bender GmbH & Co. KG
P.O. Box 1161 • 35301 Gruenberg • Germany
Londorfer Strasse 65 • 35305 Gruenberg • 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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CMD420_421-DM_D00224_01_M_XXEN/08.2016
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
2.4 Information about factory setting .......................................................... 14
3. Function ........................................................................................................... 15
3.1 Device features .............................................................................................. 15
3.2 Description of function ............................................................................... 15
3.2.1 Window discriminator function ............................................................... 16
3.2.2 Automatic self test ........................................................................................ 16
3.2.3 Manual self test .............................................................................................. 16
3.2.4 Malfunction ..................................................................................................... 17
3.2.5 Fault memory ................................................................................................. 17
3.2.6 Erasable history memory ............................................................................ 17
3.2.7 Start-up delay t ............................................................................................... 17
3.2.8 Analogue voltage or current output (option M) ................................ 17

Table of Contents
4CMD420_421-DM_D00224_01_M_XXEN/08.2016
3.2.9 Menu item AnA for interface configuration ........................................ 18
3.2.10 Password protection (on, OFF) ................................................................. 19
3.2.11 Factory setting FAC ...................................................................................... 19
3.2.12 Transformation ratio of the current transformers ............................. 19
4. Installation, connection and commissioning ........................................... 21
4.1 Installing the device ..................................................................................... 21
4.2 Connection of the device ........................................................................... 22
4.3 Commissioning .............................................................................................. 23
4.4 Factory setting ................................................................................................ 24
4.5 Maintenance ................................................................................................... 24
5. Operation and configuration ...................................................................... 25
5.1 Display elements in use .............................................................................. 25
5.2 Function of the operating elements ...................................................... 26
5.3 Menu structure ............................................................................................... 27
5.4 Display in standard mode .......................................................................... 29
5.5 Display in menu mode ................................................................................ 30
5.5.1 Parameter query and setting: overview ............................................... 30
5.5.2 Changeover from overcurrent to undercurrent mode or to window
mode .................................................................................................................. 32
5.5.3 Response value setting for overcurrent: ............................................... 33
5.5.4 Setting the fault memory to con mode ................................................. 34
5.5.5 Selecting the type of analogue interface ............................................. 34
5.5.6 Set the 100-% reference for the analogue interface ........................ 35
5.5.7 Setting the start-up delay t ........................................................................ 36
5.5.8 Changing from overcurrent operation to window operation ...... 36
5.5.9 Setting the transformation ratio for external current transformer ...
37
5.5.10 Factory setting and password protection ............................................ 38
5.5.11 Restoring factory settings .......................................................................... 39
5.5.12 Device information query .......................................................................... 40
5.5.13 History memory query ................................................................................. 40

Table of Contents
5CMD420_421-DM_D00224_01_M_XXEN/08.2016
6. Technical data ................................................................................................ 41
6.1 Data in tabular form ..................................................................................... 41
6.2 Current and voltage curves of the analogue interface .................... 46
6.3 Standards, approvals and certifications ................................................ 47
6.4 Label for modified versions ....................................................................... 47
6.5 Ordering details ............................................................................................. 48
INDEX .................................................................................................................... 49

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CMD420_421-DM_D00224_01_M_XXEN/08.2016
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
8CMD420_421-DM_D00224_01_M_XXEN/08.2016
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:
Fax:
In Germany only:
E-mail:
[phone]*
[phone]
0700BenderHelp (Tel. and Fax)
[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:
Fax:
E-mail:
[phone]** (technical
issues)
[phone]**, -785** (sales)
[phone]
[e-mail]
Please send the devices for repair to the following address:

Important information
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CMD420_421-DM_D00224_01_M_XXEN/08.2016
Bender GmbH, Repair-Service,
Londorfer Str. 65,
35305 Gruenberg
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:
Fax:
E-mail:
Internet:
[phone]**, -762 **(technical issues)
[phone]** (sales)
[phone]
[e-mail]
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 CMD420_421-DM_D00224_01_M_XXEN/08.2016
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 0
Überlassung von Standard-Software als Teil von Lieferungen, Ergänzung und
Änderung der Allgemeinen Lieferbedingungen für Erzeugnisse und Leistun-
gen der Elektroindustrie" (software clause in respect of the licensing of stand-
ard 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 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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CMD420_421-DM_D00224_01_M_XXEN/08.2016
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 CMD420_421-DM_D00224_01_M_XXEN/08.2016
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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CMD420_421-DM_D00224_01_M_XXEN/08.2016
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 CMD420_421-DM_D00224_01_M_XXEN/08.2016
2.3 Intended use
The current monitoring device CMD420-DM resp. CMD421-DM monitors
three-phase or also three different single-phase AC systems for undercurrent
or overcurrent, undercurrent and overcurrent with window discriminator
function. For current measurement, three external standard current transfor-
mers are to be connected according to the wiring diagram. The transformati-
on ratio (n = x/1A resp. n = x/5A) can be set in the range from 1…2000.
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
Page 24 provides a summary of all factory settings.
For resetting the current monitoring device to its factory setting, refer to
page 39.

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CMD420_421-DM_D00224_01_M_XXEN/08.2016
3. Function
3.1 Device features
 Undercurrent and overcurrent monitoring in AC systems, current
monitoring with window discriminator function
 Current monitoring using standard current transformers:
x/1A(CMD420-DM), x/5A (CMD421-DM)
 1 analogue output signal available as standardised current or voltage
 Digital measured value display via multi-functional LC display
 LEDs: Power On (ON), Alarm 1 (AL1) and Alarm 2 (AL2)
 Fault memory behaviour for alarm LEDs selectable
 Adjustable start-up delay
 Adjustable hysteresis for response value
 r.m.s. value measurement AC
 History memory for the operating value
 Cyclical self test
 Internal test and reset button
 Password protection to prevent unauthorised changes being made to
device settings
 Sealable transparent cover
 Available with screw-type or push-wire terminals
3.2 Description of function
Once the supply voltage is applied, the start-up delay begins. Measured cur-
rent values changing during this time do not influence the alarm LEDs.
The devices provide two separately adjustable response values (overcurrent/
undercurrent). If the measured quantity exceeds (Alarm 1) or falls below
(Alarm 2) the response value, such as is the case with window discriminator
function, the two alarm LEDs will light up. When the measured value exceeds

Function
16 CMD420_421-DM_D00224_01_M_XXEN/08.2016
or falls below the release value (response value plus hysteresis), the alarm
LEDs go out. With the fault memory activated, the alarm relays do not change
their actual state until the reset button R is pressed.
3.2.1 Window discriminator function
This operating can be used to monitor the measured current for two response
values overcurrent and undercurrent.
This operating mode (In) can be selected from the SEt menu.
Changing the operating mode of the current monitoring device, overcurrent
mode (Hi), undercurrent mode (Lo) or window mode (In) changes the me-
aning of the alarm LEDs AL1 and AL2:
3.2.2 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.
3.2.3 Manual self test
After pressing the test button for > 1.5 s, the device carries out a self test. Du-
ring this test, internal functional faults are detected and will be displayed in
form of an error code. The alarm LEDs are checked during this test. While hol-
ding down the test button T, all device-relevant display elements appear on
the display.
Communi-
cation mode LED lights Meaning
HI AL1 Prewarning overcurrent (>I)
AL2 Alarm overcurrent (>I)
Lo AL1 Prewarning undercurrent (<I)
AL2 Alarm undercurrent (<I)
In AL1 Alarm undercurrent (<I)
AL2 Alarm overcurrent (>I)

Function
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CMD420_421-DM_D00224_01_M_XXEN/08.2016
3.2.4 Malfunction
In the event of an internal malfunction, all three LEDs will flash. The error code
(E01…E32) will appear on the display. In such a case please contact the Ben-
der Service.
3.2.5 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.
3.2.6 Erasable history memory
The first alarm value to occur is written to this memory. The memory can be
erased via the HiS menu.
3.2.7 Start-up delay t
After connection to the supply voltage, the LED alarm indication is delayed by
the preset time t(0…300 s). The analogue output value will be outputted wi-
thout a delay.
3.2.8 Analogue voltage or current output (option M)
The device provides an analogue interface with galvanic isolation, but does
not provide an alarm relay. One of three output signals can be selected from
the "out" menu. A certain output is permanently assigned to the signal selec-
ted from the menu, only this output may be wired:
For wiring details refer to the wiring diagram on page 22.
Output signal Terminal Purpose of use
DC 0…400 μA μA Current output for Bender measuring instru-
ments of the 96.. series.
DC 0/4…20 mA mA Standardised current output with selectable
current ranges
DC 0…10 V V Standardised voltage signal

Function
18 CMD420_421-DM_D00224_01_M_XXEN/08.2016
3.2.9 Menu item AnA for interface configuration
The menu item "AnA" is used to configure the 100-% value of the analogue in-
terface. The 100-% value of the output current resp. the output voltage can
Display Measured variable 100-% value
CMD420-DM
> L1L2L3 I 0.30 A maximum current
from L1,L2 or L3 adjustable from 0.1…1 A x n
< L1L2L3 I 0.30 A minimum current
from L1,L2 or L3 adjustable from 0.1…1 A x n
L1 I 0.30 A Current L1 adjustable from 0.1…1 A x n
L2 I 0.30 A Current L2 adjustable from 0.1…1 A x n
L3 I 0.30 A Current L3 adjustable from 0.1…1 A x n
> L1L2L3 I2 AL maximum current
from L1,L2 or L3 Response value I2
> L1 I2 AL Current L1 Response value I2
> L2 I2 AL Current L2 Response value I2
> L3 I2 AL Current L3 Response value I2
CMD421-DM
> L1L2L3 I 1.50 A highest current
from L1,L2 or L3 adjustable from 0.5…5 A x n
< L1L2L3 I 1.50 A lowest current from
L1,L2 or L3 adjustable from 0.5…5 A x n
L1 I 1.50 A Current L1 adjustable from 0.5…5 A x n
L2 I 1.50 A Current L2 adjustable from 0.5…5 A x n
L3 I 1.50 A Current L3 adjustable from 0.5…5 A x n
> L1L2L3 I2 AL highest current
from L1,L2 or L3 Response value I2
> L1 I2 AL Current L1 Response value I2
> L2 I2 AL Current L2 Response value I2
> L3 I2 AL Current L3 Response value I2

Function
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CMD420_421-DM_D00224_01_M_XXEN/08.2016
either be set within the response value range listed in the table or can be set
in relation to the response value I2.
The column "Display" in the table above shows the phase-related measure-
ment possibilities. In the column "measuring quantity" the displays are explai-
ned. The column "100-% value" shows details about the setting range or
configuration in relation to the response value.
The setting of the analogue interface via the menu is described from page 35
onwards.
3.2.10 Password protection (on, OFF)
With the password protection activated (on), settings can only be made sub-
ject to the correct password being entered (0…999).
3.2.11 Factory setting FAC
After activating the factory setting, all previously changed settings are reset to
delivery status.
3.2.12 Transformation ratio of the current transformers
The transformation ratio for the current transformers has to be set as factor n
in the menu "Set".
CMD420-DM requires current transformers with a transformation ratio of
n= x/1A.
CMD421-DM requires current transformers with a transformation ratio of
n= x/5A.
The actual primary current can be calculated by multiplying the measured
current by factor nand indicated on the display.
Transformation ratio Resolution of
the display
Factor nResolution of the settings
1…9 1 0,01 A
10…99 1 00.1 A
100…990 10 001 A
1.00…2.00 k 0.05 k 0.01 kA

Function
20 CMD420_421-DM_D00224_01_M_XXEN/08.2016
In addition, the set factor ndirectly affects the minimum and maximum adjus-
table response values in the alarm menu. The factor is the multiplier of the no-
minal response range!
Adjustable response value = nominal response range x factor n
If the calculation of the adjustable response value results in a value of more
than three digits, the first three digits indicated are not rounded.
The resolution of the adjustable response range is calculated as follows:
Resolution of setting thresholds = factor n/ 100
Factor n
Response value range CMD420-DM
min. max.
1…9 0.10…1.00 A 0.90…9.00 A
10…99 1.0…10.0 A 9.90…99.0 A
100…990 10…100 A 99.0…990 A
1.00…2.00 k 0.10…1.00 kA 0.20…2.00 kA
Factor n
Response value range CMD421-DM
min. max.
1…9 0.50…5.00 A 4.50…45.0 A
10…99 5.0…50.0 A 49.5…495 A
100…990 50…500 A 495 A…4.95 kA
1.00…2.00 k 0.50…5.00 kA 1.00…10.0 kA