Bender VMD420 User manual

Manual
EN
VMD420
Voltage and frequency monitor
for monitoring of 3(N)AC systems up to 0…500 V
for undervoltage, overvoltage, underfrequency, overfrequency
Software version: D238 V2.2x
VMD420_D00137_01_M_XXEN/05.2016

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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VMD420_D00137_01_M_XXEN/05.2016
1. Important information .................................................................................... 7
1.1 How to use this manual ................................................................................. 7
1.2 Technical support: service and support ................................................... 8
1.2.1 First level support ............................................................................................. 8
1.2.2 Repair service ..................................................................................................... 8
1.2.3 Field service ........................................................................................................ 9
1.3 Training courses ............................................................................................. 10
1.4 Delivery conditions ....................................................................................... 10
1.5 Inspection, transport and storage ........................................................... 10
1.6 Warranty and liability ................................................................................... 11
1.7 Disposal ............................................................................................................ 12
2. Safety instructions ......................................................................................... 13
2.1 General safety instructions ........................................................................ 13
2.2 Work activities on electrical installations ............................................. 13
2.3 Intended use ................................................................................................... 14
3. Function ........................................................................................................... 15
3.1 Device features .............................................................................................. 15
3.2 Function ............................................................................................................ 15
3.2.1 Preset function ............................................................................................... 16
3.2.2 Automatic self test ........................................................................................ 17
3.2.3 Manual self test .............................................................................................. 17
3.2.4 Functional faults ............................................................................................ 17
3.2.5 Fault memory ................................................................................................. 17
3.2.6 Assigning alarm categories to alarm relays K1/K2 ............................ 18
3.2.7 Time delays t, ton and toff ......................................................................... 18
3.2.8 Password protection (on, OFF) ................................................................. 18
3.2.9 Factory setting FAC ...................................................................................... 19

Table of Contents
4VMD420_D00137_01_M_XXEN/05.2016
3.2.10 Erasable history memory ............................................................................ 19
3.2.11 Alarm LEDs show which relay is in the alarm state ........................... 19
3.2.12 Starting a device using a simulated alarm S.AL .................................. 19
4. Installation, connection and commissioning ........................................... 21
4.1 Fast commissioning for Un = 400 V, 50 Hz ........................................... 21
4.2 Installing the device ..................................................................................... 23
4.2.1 DIN rail mounting: ......................................................................................... 23
4.2.2 Screw mounting ............................................................................................ 23
4.3 Wiring of the device ..................................................................................... 24
4.4 Commissioning preset function/factory setting ................................ 25
5. Operation and setting .................................................................................. 27
5.1 Getting to know the user interface ......................................................... 27
5.2 Understanding of standard display indications ................................. 29
5.3 Getting to know keys and key functions .............................................. 30
5.4 Query values .................................................................................................... 31
5.5 Starting the manual self test .................................................................... 32
5.6 Deactivating fault memory ........................................................................ 33
5.7 Calling up or leaving the menu ................................................................ 33
5.8 Carrying out settings in the menu .......................................................... 33
5.8.1 Selecting menu items .................................................................................. 33
5.8.2 Carrying out settings in the menu item AL .......................................... 36
5.8.3 Carrying out settings in the menu item out ........................................ 39
5.8.4 Carrying out settings in the menu item t ............................................. 44
5.8.5 Carrying out settings in the menu item SEt ......................................... 45
5.8.6 Querying information in menu item INF .............................................. 48
5.8.7 Querying and clearing fault memory in the menu item HIS ......... 49

Table of Contents
5VMD420_D00137_01_M_XXEN/05.2016
6. Technical data ................................................................................................ 51
6.1 Data in tabular form ..................................................................................... 51
6.2 Standards, approvals and certifications ................................................ 55
6.3 Ordering information ................................................................................... 55
INDEX .................................................................................................................... 57

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VMD420_D00137_01_M_XXEN/05.2016
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
8VMD420_D00137_01_M_XXEN/05.2016
This manual has been compiled with great care. It might nevertheless contain
errors and mistakes. Bender cannot accept any liability for injury to persons or
damage to property resulting from errors or mistakes in this manual.
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers you:
1.2.1 First level support
Technical support by phone or e-mail for all Bender products
 Questions concerning specific customer applications
 Commissioning
 Troubleshooting
Telephone: [phone]*
Fax: [phone]
In Germany only: 0700BenderHelp (Tel. and Fax)
E-mail: [email protected]
1.2.2 Repair service
Repair, calibration, update and replacement service for Bender products
 Repairing, calibrating, testing and analysing Bender products
 Hardware and software update for Bender devices
 Delivery of replacement devices in the event of faulty or incorrectly
delivered Bender devices
 Extended guarantee for Bender devices, which includes an in-house
repair service or replacement devices at no extra cost
Telephone: [phone]** (technical issues)
[phone]**, -785** (sales)
Fax: [phone]
E-mail: [email protected]
Please send the devices for repair to the following address:

Important information
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VMD420_D00137_01_M_XXEN/05.2016
Bender GmbH, Repair-Service,
Londorfer Str. 65,
35305 Grünberg
1.2.3 Field service
On-site service for all Bender products
 Commissioning, configuring, maintenance, troubleshooting of Bender
products
 Analysis of the electrical installation in the building (power quality test,
EMC test, thermography)
 Training courses for customers
Telephone: [phone]**, -762 **(technical issues)
[phone]** (sales)
Fax: [phone]
E-mail: [e-mail]
Internet: www.bender-de.com
*Available from 7.00 a.m. to 8.00 p.m. 365 days a year (CET/UTC+1)
**Mo-Thu 7.00 a.m. - 8.00 p.m., Fr 7.00 a.m. - 13.00 p.m

Important information
10 VMD420_D00137_01_M_XXEN/05.2016
1.3 Training courses
Bender is happy to provide training regarding the use of test equipment.
The dates of training courses and workshops can be found on the Internet at
www.bender-de.com -> Know-how -> Seminars.
1.4 Delivery conditions
Bender sale and delivery conditions apply.
For software products the "Softwareklausel zur Überlassung von Standard-
Software als Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen
Lieferbedingungen für Erzeugnisse und Leistungen der Elektroindustrie"
(software clause in respect of the licensing of standard software as part of de-
liveries, modifications and changes to general delivery conditions for prod-
ucts and services in the electrical industry) set out by the ZVEI (Zentralverband
Elektrotechnik- und Elektronikindustrie e. V.) (German Electrical and Electron-
ic Manufacturer's Association) also applies.
Sale and delivery conditions can be obtained from Bender in printed or elec-
tronic format.
1.5 Inspection, transport and storage
Inspect the dispatch and equipment packaging for damage, and compare the
contents of the package with the delivery documents. In the event of damage
in transit, please contact Bender immediately.
The devices must only be stored in areas where they are protected from dust,
damp, and spray and dripping water, and in which the specified storage tem-
peratures can be ensured.

Important information
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VMD420_D00137_01_M_XXEN/05.2016
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 VMD420_D00137_01_M_XXEN/05.2016
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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VMD420_D00137_01_M_XXEN/05.2016
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 VMD420_D00137_01_M_XXEN/05.2016
2.3 Intended use
The voltage monitor VMD420 monitors 3(N)AC systems in the frequency ran-
ge 15…460 Hz for undervoltage, overvoltage, underfrequency and overfre-
quency. The devices are designed for the nominal voltage range Un= 0…500
V. Separate supply voltage Us is required.
In order to meet the requirements of the applicable standards, customised pa-
rameter settings must be made on the equipment in order to adapt it to local
equipment and operating conditions. Please heed the limits of the range of
application indicated in the technical data.
Any use other than that described in this manual is regarded as improper.

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VMD420_D00137_01_M_XXEN/05.2016
3. Function
3.1 Device features
 VMD420 requires separate supply voltage Us
 Undervoltage, overvoltage, underfrequency and overfrequency moni-
toring of 3(N)AC systems up to AC 0…500 V / 0…288 V
 Asymmetry, phase failure and phase sequence monitoring
 Start-up delay, response delay and delay on release adjustable
 Adjustable switching hysteresis for U and f
 r.m.s. value measurement AC +DC
 Measured value display via multi-functional LC display
 LEDs for Power on, Alarm 1 and Alarm 2
 Fault memory for operating value
 Cyclical self test
 Test / reset button, internal
 Two separate alarm relays with one changeover contact each (K1/K2)
 N/C or N/O operation and fault memory behaviour selectable
 Password protection for device setting
 Sealable transparent cover
 Screw-type or push-wire terminals alternatively
3.2 Function
Once the supply voltage is applied, the start-up delay t is activated. Measured
values changing during this time do not influence the switching state of the
alarm relays.
The devices provide two separately adjustable response values
(overvoltage/undervoltage). When the measuring quantity exceeds the res-
ponse value (Alarm 1) or falls below the response value (Alarm 2), the time of
the response delays ton 1/2 begins. When the response delay has elapsed, the
alarm relays switch and the alarm LEDs light. If the measured value falls below

Function
16 VMD420_D00137_01_M_XXEN/05.2016
or exceeds the adjusted delay on release (response value plus hysteresis) after
the alarm relays have switched, the delay on releasetoff starts. When the delay
time toff has elapsed, the alarm relays switch back to their initial position. With
the fault memory activated, the alarm relays do not change their actual state
until the reset button R is pressed.
3.2.1 Preset function
After connecting the system to be monitored for the first time, the response
values for overvoltage and undervoltage (Alarm 1/2) are automatically set
once to:
Response value overvoltage ( > U): 1.1 Un
Response value undervoltage ( < U): 0.85 Un
Response value overfrequency ( > f) at 16.7 Hz, 50 Hz, 60 Hz: fn+ 1 Hz
Response value overfrequency ( > f) at 400 Hz: fn+ 1 Hz
Response value underfrequency ( < f) at 16.7 Hz, 50 Hz, 60 Hz: fn- 1 Hz
Response value underfrequency ( < f) at 400 Hz: fn- 1 Hz
Preset VMD420
Measuring principle Un
Preset
operating
range
Response
value
< U
Response
value
> U
Three-phase measu-
rement: 3Ph
400 V
(L1, L2, L3) 340…440 V 340 V 440 V
208 V
(L1, L2, L3) 177…229 V 177 V 229 V
Only when the preset function (Menu/SEt/PrE) has been started manually,
the following response values can be set:
Phase-to-neutral vol-
tage measurement:
3n
230 V
(L1, L2, L3, N) 196…253 V 196 V 253 V
120 V
(L1, L2, L3, N) 102…132 V 102 V 132 V

Function
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VMD420_D00137_01_M_XXEN/05.2016
If the measured voltage is not within the preset operating range listed in the
table, the message "AL not Set“ appears on the display. Therefore it is neces-
sary to set the response values for Alarm 1 (AL1) and Alarm 2 (AL2) manually.
A detailed description of the process is given in the chapter "parameter
setting“.
After restoring the factory settings, the preset function is automatically active
again. During operation, the preset function can be started manually via the
menu SEt.
3.2.2 Automatic self test
The device automatically carries out a self test after connection to the system
to be monitored and later every hour. During the self test internal functional
faults are detected and will appear in form of an error code on the display. The
alarm relays are not checked during this test.
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 relays are not checked during this test.
While the test button T is pressed and held down, all device-related display
elements appear on the display.
3.2.4 Functional faults
If an internal malfunction occurs, all three LEDs flash. An error code will appear
on the display (E01…E32). In such a case please contact the Bender Service.
3.2.5 Fault memory
The fault memory can be activated, deactivated or can be set to continuous
mode (con). If the fault memory is set to "con“ mode, the alarm parameters re-
main stored even on failure of the supply voltage.

Function
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3.2.6 Assigning alarm categories to alarm relays K1/K2
Different alarm categories can be assigned to the alarm relays K1/K2 via the
menu "out".
3.2.7 Time delays t, ton and toff
The times t, ton and toff, described below, delay the output of alarms via LEDs
and relays.
Start-up delay t
After connection to the supply voltage US, the alarm indication is delayed by
the preset time t(0…300 s).
Response delay ton
When the response value is reached, the voltage monitor requires the respon-
se time tan until the alarm is activated.
A preset response delay ton (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 signalled.
Delay on release toff
When the alarm no longer exists and the fault memory is deactivated, the
alarm LEDs go out and the alarm relays switch back to their initial position.
When the delay on release (0…300 s) has been preset, the alarm state is con-
tinuously maintained for the selected period.
3.2.8 Password protection (on, OFF)
When password protection is enabled (on), settings can only be carried out af-
ter entering the password (0…999). If you cannot operate your
device because you cannot remember your password, please contact
[email protected].

Function
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VMD420_D00137_01_M_XXEN/05.2016
3.2.9 Factory setting FAC
After activating the factory setting, all settings previously changed are reset to
delivery status. In addition, the preset function allows automatic adaptation
of the response values in relation to the nominal voltage Un.
3.2.10 Erasable history memory
The first alarm value that occurs will be saved in this memory. Subsequent
alarms do not overwrite this "old“ value.The memory can be cleared using the
Clr key in the menu HiS. This function is not password protected.
3.2.11 Alarm LEDs show which relay is in the alarm state
When the menu item LEd is activated, the alarm LED AL1 indicates that
K1 is in the alarm state. When AL2 lights up, K2 is in the alarm state. An alarm
relay cannot switch to the alarm state unless an alarm category has been assi-
gned to it.
When the menu item LEd is deactivated, AL1 signals overvoltage, AL2 si-
gnals undervoltage, both LEDs AL1 and AL2 light up in case of frequency
alarm.
3.2.12 Starting a device using a simulated alarm S.AL
If the menu item S.AL has been activated in the out menu, K1 resp. K2 switches
back to the alarm state once the supply voltage is applied. This alarm state is
maintained for the set duration t+ ton1. Once this time has elapsed, K1 resp.
K2 switches back to the initial position provided that no fault is detected at the
measuring input.
The following diagrams show the effect of a fault during a simulated alarm.
Faults at the measuring input and the resulting condition of the alarm relay K1
(K2) are shown as a hatched area.

Function
20 VMD420_D00137_01_M_XXEN/05.2016
The fault for K1 shown in the time diagram below, by way of example, has
started during the S.AL phase:
The fault for K1 shown in the time diagram below, by way of example, started
when the S.AL phase has elapsed:
t
on1
t
t
on1
S.AL
U
F
U
N
K1
t
on1
t
t
on1
S.AL
U
F
U
N
K1