Bender VMD420 User manual

Manual ENVMD420_D00137_03_M_XXEN/03.2020
VMD420
Voltage and frequency monitor
for monitoring of 3(N)AC systems up to 0…500 V for undervoltage, overvoltage, underfrequency,
overfrequency

2 VMD420_D00137_03_M_XXEN/03.2020
Service and support for Bender products
First-level support
Technical support
Carl-Benz-Strasse 8 • 35305 Grünberg • Germany
Telephone: [phone]
0700BenderHelp *
Fax: [phone]
E-mail: [e-mail]
Available on 365 days from 7.00 a.m. to 8.00 p.m. (MEZ/UTC +1)
* Landline German Telekom: Mon-Fri from 9.00 a.m. to 6 p.m.: 6.3 cents/30 sec.; remaining time: 6.3
cents/min.
Mobile phone: higher, depending on mobile phone tariff
Repair service
Repair, calibration and replacement service
Londorfer Strasse 65 • 35305 Grünberg • Germany
Telephone: [phone] (technical issues) or
[phone], -785 (commercial issues)
Fax: [phone]
E-mail: [email protected]
Field service
On-site service
Telephone: [phone], -762 (technical issues) or
[phone] (commercial issues)
Fax: [phone]
E-mail: fi[e-mail]
Mon-Thu 7.00 a.m. to 4.00 p.m., Fri 7.00 a.m. to 1 p.m. (MEZ/UTC +1)

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Table of Contents
1 General instructions .........................................................................5
1.1 How to use this manual..............................................................................................5
1.2 Indication of important instructions and information ...................................5
1.2.1 Signs and symbols ........................................................................................................5
1.3 Training courses and seminars.................................................................................5
1.4 Delivery conditions.......................................................................................................5
1.5 Inspection, transport and storage ..........................................................................6
1.6 Warranty and liability...................................................................................................6
1.7 Disposal of Bender devices........................................................................................6
1.8 Safety .................................................................................................................................6
2 Function...............................................................................................9
2.1 Device features ..............................................................................................................9
2.2 Function............................................................................................................................9
2.2.1 Preset function...............................................................................................................9
2.2.2 Automatic self test..................................................................................................... 10
2.2.3 Manual self test...........................................................................................................10
2.2.4 Functional faults......................................................................................................... 10
2.2.5 Fault memory ..............................................................................................................10
2.2.6 Assigning alarm categories to alarm relays K1/K2.........................................11
2.2.7 Time delays t, ton, and toff ........................................................................................11
2.2.8 Password protection (on, OFF).............................................................................. 11
2.2.9 Factory setting FAC ................................................................................................... 11
2.2.10 Erasable history memory.........................................................................................11
2.2.11 Alarm LEDs show which relay is in the alarm state....................................... 11
2.2.12 Starting a device using a simulated alarm S.AL.............................................. 12
2.2.13 Frequency alarm in case of measuring voltage failure................................ 12
3 Montage, Anschluss und Inbetriebnahme................................. 15
3.1 Fast comissioning for Un= 400 V, 50 Hz............................................................ 15
3.2 Installation ....................................................................................................................16
3.3 Wiring diagram ...........................................................................................................17
3.4 Commissioning preset function / factory setting ..........................................17
3.5 Eigene Einstellungen ................................................................................................18
4 Operating and setting.................................................................... 21
4.1 Getting to know the user interface .....................................................................21
4.2 Standard display indications.................................................................................. 21
4.3 Keys and key functions ............................................................................................ 22
4.4 Query values ................................................................................................................23
4.5 Starting the manual self test.................................................................................. 23
4.6 Deactivating fault memory..................................................................................... 24

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4.7 Calling up or leaving the menu ............................................................................ 24
4.8 Carrying out settings in the menu.......................................................................24
4.8.1 Select menu items ..................................................................................................... 24
4.8.2 Carrying out settings in the menu item AL...................................................... 25
4.8.3 Carrying out settings in the menu item out .................................................... 28
4.8.4 Carrying out settings in the menu item t.......................................................... 32
4.8.5 Carrying out settings in the menu item SEt.....................................................32
4.8.6 Querying information in menu item INF........................................................... 35
4.8.7 Querying and clearing fault memory in the menu item HIS......................36
5 Technical Data ................................................................................. 37
5.1 Data in tabular form.................................................................................................. 37
5.2 Ordering information ...............................................................................................40
5.3 Scope for Delivery...................................................................................................... 40

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1 General instructions
1.1 How to use this manual
This manual is intended for qualified personnel working in electrical engineering and elec
tronics! Part of the device documentation, in addition to this manual, is the enclosed
“Safety instructions for Bender products”.
Read the manual before installing, connecting and commissioning the device.
Always keep the manual within easy reach for future reference.
1.2 Indication of important instructions and information
I Danger! Indicates a high risk of danger that will result in death or serious injury if not avoi-
ded.
I Warning! Indicates a medium risk of danger that can lead to death or serious injury, if not
avoided.
I Caution! Indicates a low-level risk that can result in minor or moderate injury or damage to
property if not avoided.
i
Information can help to optimise the use of the product.
1.2.1 Signs and symbols
Disposal Temperature range protect from dust
protect from wet-
ness
Recycling RoHS
guidelines
1.3 Training courses and seminars
www.bender.de > Know-how-> Seminars.
1.4 Delivery conditions
The conditions of sale and delivery set out by Bender apply. These can be obtained from Bender
in printed or electronic format.
The following applies to software products:
“Software clause in respect of the licensing of standard software as part of de-
liveries, modifications and changes to general delivery conditions for products
and services in the electrical industry.”
Die Elektroindustrie

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General instructions
1.5 Inspection, transport and storage
Check the shipping and device packaging for transport damage and scope of delivery. The follow-
ing must be observed when storing the devices:
1.6 Warranty and liability
Warranty and liability claims in the event of injury to persons or damage to property are excluded
in case of:
• 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, com-
missioning, 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.
• Use of accessories and spare parts not recommended by Bender.
• Catastrophes caused by external influences and force majeure.
• Mounting and installation with device combinations not recommended by the manufac-
turer.
This operating manual and the enclosed safety instructions must be observed by all persons
working with the device. Furthermore, the rules and regulations that apply for accident preven-
tion at the place of use must be observed.
1.7 Disposal of Bender devices
Abide by the national regulations and laws governing the disposal of this device.
For more information on the disposal of Bender devices, refer to
www.bender.de -> Service & support.
1.8 Safety
If the device is used outside the Federal Republic of Germany, the applicable local standards and
regulations must be complied with. In Europe, the European standard EN 50110 applies.
I Danger! Risk of electrocution due to electric shock! Touching live parts of the system carries
the risk of:
• A fatal electric shock
• Damage to the electrical installation
• Destruction of the device

VMD420_D00137_03_M_XXEN/03.2020 7
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Before installing and connecting the device, make sure that the installation has been de-ener-
gised. The rules for working on electrical systems must be observed.

8 VMD420_D00137_03_M_XXEN/03.2020
Function

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2 Function
2.1 Device features
• VMD420 requires separate supply voltage Us
• Undervoltage, overvoltage, underfrequency and overfrequency monitoring 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
2.2 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 response 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 or exceeds the ad-
justed delay on release (response value plus hysteresis) after the alarm relays have switched, the
delay on release toff 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.
2.2.1 Preset function
After connecting the system to be monitored for the first time, the response values for overvolta-
ge 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

10 VMD420_D00137_03_M_XXEN/03.2020
Function
• 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 UnPreset-
operating range
Response
value <U
Response
value >U
Three-phase measure-
ment: 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 voltage
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
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 necessary 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 ope-
ration, the preset function can be started manually via the menu SEt.
2.2.2 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.
2.2.3 Manual self test
After pressing the test button for > 1.5 s, the device carries out a self test. During this test, internal
functional faults are detected and will be displayed in form of an error code. The alarm relays are
not checked during this test. While the test button T is pressed and held down, all device-related
display elements appear on the display.
2.2.4 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.
2.2.5 Fault memory

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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 remain stored even on failure of the sup-
ply voltage.
2.2.6 Assigning alarm categories to alarm relays K1/K2
Different alarm categories can be assigned to the alarm relays K1/K2 via the menu „out“.
2.2.7 Time delays t, ton, and toff
The times t, ton und 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 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 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 continuously maintained for the selected period.
2.2.8 Password protection (on, OFF)
When password protection is enabled (on), settings can only be carried out after ntering the pass-
word (0…999). If you cannot operate your device because you cannot remember your password,
please contact [email protected].
2.2.9 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.
2.2.10 Erasable history memory
The first alarm value that occurs will be saved in this memory. Subsequent alarms do not overwri-
te this „old“ value. The memory can be cleared using the Clr key in the menu HiS. This function is
not password protected.

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Function
2.2.11 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 assigned to it.
When the menu item LEd is deactivated, AL1 signals overvoltage, AL2 signals undervolta-
ge, both LEDs AL1 and AL2 light up in case of frequency
2.2.12 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 measu-
ring input and the resulting condition of the alarm relay K1 (K2) are shown as a hatched area.
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 pha-
se has elapsed::
ton1
t
ton1
S.AL
U
F
U
N
K1
ton1
t
ton1
S.AL
U
F
U
N
K1

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2.2.13 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 setting).
Off: The device does not set a frequency alarm.
Note for <U Hz = Off:
i
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 bzw. ton2 and toff .
i
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).

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Installation, connection and comissioning

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3 Installation, connection and comissioning
I 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 or destruction of the device Before in-
stalling and connecting the device, make sure that the installation has been de-energised.
Observe the rules for working on electrical installations.
3.1 Fast comissioning for Un= 400 V, 50 Hz
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 three-phase system being monitored is operated with a nominal voltage
of Un = 400 V and 50 Hz. This is the precondition for an automatic setting of the res-
ponse values (Preset) after the first connection to the nominal voltage.
2. Make sure that the voltage monitor is in the delivery status (factory setting has not been
changed).
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 (see chapter
„Wiring the device“).
The following predefined response values will be set automatically:
VMD420
Un, fnPreset-
operating range
Response value
< U, < f
Response value
> U, > f
400 V
(L1, L2, L3) 340. . .440 V 340 V 440 V
50Hz 47. . .53 Hz 49 Hz 51 Hz
4. The currently measured phase-to-phase voltage between L1 and L2 appears on the dis-
play. Use the UP and DOWN keys to query other parameters:
• phase-to-phase voltage L2, L3
• phase-to-phase voltage L1, L3
• asymmetry
• system frequency
• phase sequence
For detailed information about the preset function and other voltage ranges refer to chapter
„Preset function“. If you want to reset the voltage monitors to factory settings, refer to chapter
„Factory settings FAC“.

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Installation, connection and comissioning
3.2 Installation
Dimensions
Mounting
Abb. 3–1 Variant A: DIN rail mountig, Variant B: Screw mounting
90 mm
45
67,5
36 mm
31,1
47,5
70,5
2
2
1.
2.
3. Click!
&2 x
1 x
100 mm 107 mm
Click
M4
M4
!

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3.3 Wiring diagram
Abb. 3–1 Wiring
Terminal Connections
A1, A2 Connection to the supply voltage Us
L1, L2, L3, (N) Connection to the system being monitored
11, 12, 14 Alarm relay K1
21, 22, 24 Alarm relay K2
3.4 Commissioning preset function / factory setting
I Material damage by improper connection of the device! Prior to commissioning make sure
that the device is properly connected!!
i
After connecting a brand-new VMD420… to a standard system of Un= 400 V 50 Hz, the res-
ponse values are automatically set by the internal preset function:
Overvoltage = 440 V (400 V + 10 %) (50 Hz + 1 Hz)
Undervoltage = 340 V (400 V - 15 %) (50 Hz - 1 Hz)
Other operating ranges of the preset function are given in the technical data „response values“
and in the description of the function.

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Installation, connection and comissioning
During the first start-up process the following response values are automatically set related to Un:
Response value overvoltage (> U) 1.1 Un
Response value undervoltage (< U) 0.85 Un
Hysteresis U 5 %
Underfrequency < Hz OFF
Overfrequency > Hz OFF
Hysteresis frequency (Hys Hz) 0.2 Hz
Frequency alarm (< U Hz) on
Fault memory (M) on
Operating principle K1 (> U, Asy) N/O operation-(n.o.)
Operating principle K2 (< U, Asy) N/C operation (n.c.)
AL1/AL2 indicate the alarm state of K1/K2 (LEd) OFF
Alarm to K1/K2 (S.AL) when the device is started OFF
Start-up delay t = 0 s
Asymmetry (Asy) 30 %
Phase sequence monitoring OFF
Response delay ton1 = 0 s
ton2 = 0 s
Delay on release toff = 0.5 s
Method of measurement 3Ph (phase-to-phase voltage measure-
ment)
Password 0, OFF

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3.5 User settings
Menu Parameter FAC¹ User setting Setting range AL-LED
AL
< U ON PRESET V 6 V 2*
> U ON PRESET V 500V 1*
U Hys 5 % % 1 %. . . 40 %
Asy % 5 %. . . 30 % 1+2*
< Hz OFF PRESET Hz 10 Hz 1+2*
> Hz OFF PRESET Hz 500 Hz 1+2*
HZ Hys (0.2 Hz)1Hz 0.1 Hz . . . 2.0 Hz
< U Hz ON ON / OFF
PHS OFF R R / L 1+2*
out
M ON ON / OFF / CON
1 n.o.
2 n.c.
LEd OFF 1/2 **
r1
1 Err OFF
r1 < U OFF
r1 > U ON
r1 Asy ON
r1 Hz< ON
r1 Hz> ON
1 PHS ON
1 S.AL OFF ***
r2
2 Err OFF
r2 U< ON
r2 U> OFF
r2 Asy ON
r2 Hz< ON
r2 Hz> ON
2 PHS ON
2 S.AL OFF ***

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Installation, connection and comissioning
Menu Parameter FAC* Eigene Einstellungen /
User setting
Einstellbereich /
Setting range
AL-LED
t
ton 1
0 s
s
0 s. . . 300 ston 2 s
t s
to 0,5 s s 0 s. . . 300 s
Set
L1, L2, L3 3Ph 3Ph / 3 n
OFF 0
FAC
PrE 3Ph 3Ph / 3 n
SYS
InF
HiS Clr
¹ Factory settings, * only when LEd = off, ** only when LEd = on, *** depending on LEd setting