Bender VME420 User manual

VME420
Voltage and frequency monitor
for monitoring AC/DC systems of 0…300 V, 15…460 Hz
for undervoltage, overvoltage, underfrequency, overfrequency
VME420_D00026_03_M_XXEN/04.2019 Manual EN

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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VME420_D00026_03_M_XXEN/04.2019
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
3. Function ........................................................................................................... 13
3.1 Device features .............................................................................................. 13
3.2 Fast commissioning for Un = 230 V ........................................................ 14
3.3 Function ............................................................................................................ 15
3.4 Preset function ............................................................................................... 15
3.5 Automatic self test ........................................................................................ 16
3.6 Manual self test .............................................................................................. 16
3.7 Functional fault .............................................................................................. 16
3.8 Fault memory ................................................................................................. 16
3.9 Assigning alarms to the alarm relays K/K2 ........................................... 17
3.10 Time delays t, ton and toff ......................................................................... 17
3.11 Password protection (on, OFF) ................................................................. 17

Table of Contents
4VME420_D00026_03_M_XXEN/04.2019
3.12 Factory setting FAC ...................................................................................... 18
3.13 Erasable history memory ............................................................................ 18
3.14 Alarm LEDs show which relay is in the alarm state ........................... 18
3.15 Starting a device using a simulated alarm S.AL .................................. 18
3.16 Frequency alarm in case of measuring voltage failure ................... 20
4. Installation and connection ......................................................................... 21
5. Operation and setting .................................................................................. 23
5.1 Display elements in use .............................................................................. 23
5.2 Function of the operating elements ...................................................... 24
5.3 Menu structure ............................................................................................... 25
5.4 Display in standard mode .......................................................................... 27
5.5 Display in menu mode ................................................................................ 28
5.5.1 Setting: response values for under-, overvoltage and hysteresis 30
5.5.2 Setting: response values for under-, overfrequency, hysteresis ... 32
5.5.3 Setting: fault memory and operating principle (alarm relays) ...... 33
5.5.4 Assigning alarm categories to the alarm relays ................................. 35
5.5.5 Setting the time delays ............................................................................... 37
5.5.6 Factory setting and password protection ............................................ 38
5.5.7 Restoring factory settings .......................................................................... 40
5.5.8 Manual activation of the preset function ............................................. 40
5.5.9 Device information interrogation ........................................................... 41
5.5.10 History memory interrogation .................................................................. 41
5.6 Preset function/ factory setting ............................................................... 41
5.7 Commissioning .............................................................................................. 42
6. Technical data VME420… ............................................................................ 43
6.1 Data in tabular form ..................................................................................... 43
6.2 Standards, approvals and certifications ................................................ 47
6.3 Ordering information ................................................................................... 47
6.4 User settings (overview) ............................................................................. 48
INDEX .................................................................................................................... 49

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VME420_D00026_03_M_XXDE/04.2019
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 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.
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
6VME420_D00026_03_M_XXDE/04.2019
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 Gruenberg

Important information
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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
8VME420_D00026_03_M_XXDE/04.2019
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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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 recommen-
ded 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 VME420_D00026_03_M_XXDE/04.2019
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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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 VME420_D00026_03_M_XXDE/04.2019
2.3 Intended use
The voltage monitor VME420 monitors AC/DC systems in the frequency range
DC/15…460 Hz for undervoltage, overvoltage, underfrequency and overfre-
quency. The devices are designed for the nominal voltage range
Un= 0…300 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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3. Function
3.1 Device features
 Undervoltage and overvoltage monitoring of AC/DC systems 0…300 V
in the frequency range DC/15…460 Hz
 Preset function: Automatic response value setting for undervoltage
and overvoltage, < U and > U as well as for underfrequency and over-
frequency < f and > f.
 Voltage and frequency monitoring with window discriminator func-
tion, < U and > U as well as < f and > f.
 Indication of the system frequency f
 Start-up delay, response delay and delay on release
 Adjustable switching hysteresis for U and f
 r.m.s. value measurement AC + DC
 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 unauthorised parameter changing
 Fault memory can be deactivated. In the
"con“ mode, all alarm parameters remain stored on failure of the supply
voltage.
 Start-up of the device with or without simulated alarm message
 Frequency alarm behaviour in case of measuring voltage failure can be
parameterised

Function
14 VME420_D00026_03_M_XXDE/04.2019
3.2 Fast commissioning for Un= 230 V
If you are already familiar with voltage monitors, you can reduce the time for
commissioning and connection using this brief description.
1. Check that the system being monitored is operated with a nominal
voltage of Un= 230 V and 50 Hz. This is the precondition for an auto-
matic setting of the response values (Preset) after the first connection
to the nominal voltage.
2. Make sure that the voltage monitor is in the delivery status (factory set-
ting has not been changed). In case of doubt, restore the factory set-
ting (page 40).
3. When the conditions 1 and 2 are satisfied, you can connect the voltage
monitor to the three-phase system to be monitored according to the
wiring diagram (page 22). The following predefined response values
will be set automatically:
4. The currently measured voltage between the terminals U1/+ and U2/-
appears on the display. In addition, you can query the system fre-
quency f using the Up and Down key when AC voltage is applied.
For detailed information about the preset function and other voltage ranges
refer to page 15; page 41 provides a summary of all factory settings.
If you want to reset the voltage monitors to factory settings, refer to page 40.
VME420
Un, fn
Preset
operating
range
Response
value
< U, < f
Response
value
> U, > f
230 V 196…253 V 196 V 253 V
50 Hz 47…53 Hz 49 Hz 51 Hz

Function
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3.3 Function
Once the supply voltage is applied, the start-up delay "t" begins. Measured
values changing during this time do not influence the switching state of the
alarm relays.
The devices provide two separately adjustable measuring channels
(overvoltage/undervoltage). If the measured value drops below the response
value Alarm 2 or exceeds the response value (Alarm 1), the set response delays
"ton 1/2" start. Once the response delay has elapsed, the alarm relays switch
and the alarm LEDs light up. If the measuring value exceeds or falls below the
release value (response value plus hysteresis) after the alarm relays have
switched, the selected delay on release "toff" starts. Once "toff" has elapsed, the
alarm relays switch back to their initial position. If the fault memory is enabled,
the alarm relays remain in alarm state until the reset button R is pressed.
3.4 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 VME420
UnPreset
operating range
Response value
< U
Response value
> U
230 V 196…253 V 196 V 253 V
120 V 102…132 V 102 V 132 V
60 V 51…66 V 51 V 66 V
24 V 20.4…26.4 V 20.4 V 26.4 V

Function
16 VME420_D00026_03_M_XXDE/04.2019
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.
3.5 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 appear in form of an error code on the display. The
alarm relays are not checked during this test.
3.6 Manual self test
After pressing the internal test button for > 1.5 s, aself test is performed by the
device. During this test, internal functional faults are determined and appear
in form of an error code on the display. The alarm relays are not checked dur-
ing this test.
While the test button T is pressed and held down, all device-related display el-
ements appear on the display.
3.7 Functional fault
If there is an internal functional fault, all three LEDs flash. The display shows an
error code (E01…E32). In such a case please contact the Bender Service.
3.8 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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3.9 Assigning alarms to the alarm relays K/K2
Different alarm categories can be assigned to the alarm relays K1/K2 via the
menu "out".
3.10 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
Once the supply voltage Ushas been switched on, the alarm indication is de-
layed by the preset time t (0…300 s).
Response delay ton
When the value drops below or exceeds the response value, the voltage mon-
itor requires the response 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 no longer exists during the response delay, the alarm signal drops
out.
Delay on release toff
If the alarm no longer exists during the response delay and the fault memory
is deactivated, the alarm LEDs will go out and the alarm relays switch back to
their initial position. The delay on release (0…300 s) serves to maintain the
alarm state signal for the set duration.
3.11 Password protection (on, OFF)
With the password protection activated (on), settings are only possible after
entering the correct password (0…999). If you cannot operate your device be-
cause you cannot remember your password, please contact info@Bender-
service.com.

Function
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3.12 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.
3.13 Erasable history memory
The first alarm value that occurs will be stored in this memory.
Subsequent alarms do not overwrite this "old" value. The memory can be
cleared using the Clr key in the menu HiS.
3.14 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
assigned to it.
When the menu item LEd is deactivated, AL1 signals overvoltage, AL2
signals undervoltage, both LEDs AL1 and AL2 light up in case of frequency
alarm.
For details about alarm category assignment to the respective relays refer to
the submenu out description on page 26.
3.15 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
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VME420_D00026_03_M_XXDE/04.2019
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:
ton1
t
ton1
S.AL
UF
UN
K1
ton1
t
ton1
S.AL
UF
UN
K1

Function
20 VME420_D00026_03_M_XXDE/04.2019
3.16 Frequency alarm in case of measuring voltage failure
(Menu -> AL -> <U Hz)
If the voltage of the monitored system falls to the point where the frequency
can no longer be determined, this parameter is used to set how the frequency
alarm should behave.
On: The device sets the underfrequency/overfrequency alarm (factory set-
ting).
Off: The device does not set a frequency alarm.
Note for <U Hz = Off:
If there are transients (depending on circuit breakers and
system parameters) when the voltage of the monitored
system fails or returns, the device may still briefly output a
frequency alarm.
To avoid this behaviour, the relay to which frequency alarms
are assigned must be delayed by means of ton1 or ton2 and
toff.
If the frequency of the monitored system slowly returns (e.g.
due to a starting generator), the frequency monitoring only
becomes active when the frequency is within specified limits
(≥10 Hz).