Bender VMD423 User manual

Power in electrical safety
Operating Manual
VMD423
Voltage and frequency monitor
for monitoring of 3(N)AC systems up to 0...500 V
for undervoltage and overvoltage and under and overfrequency
Software version: D344 V3.1x
TGH1444en/04.2011

Dipl.-Ing. W. Bender GmbH & Co. KG
Londorfer Str. 65 • 35305 Grünberg • Germany
Postfach 1161 • 35301 Grünberg • Germany
Tel.: [phone]
Fax: [phone]
E-Mail: [email protected]om
Web: http://www.bender-de.com
©Dipl.-Ing. W. Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!

Table of Contents
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1. How to use this documentation effectively ............................................... 5
1.1 How to use this manual ................................................................................. 5
2. Safety .................................................................................................................. 7
2.1 General ................................................................................................................. 7
2.2 Intended use ...................................................................................................... 7
2.3 Skilled person .................................................................................................... 7
2.4 Safety information on work activities on electrical installations .. 8
3. Function ............................................................................................................. 9
3.1 Device features ................................................................................................. 9
3.2 Function ............................................................................................................ 10
3.2.1 Calculating the average value of overvoltage .................................... 10
3.2.2 Automatic self test ........................................................................................ 10
3.2.3 Manual self test .............................................................................................. 10
3.2.4 Functional faults ............................................................................................ 11
3.2.5 Fault memory ................................................................................................. 11
3.2.6 Assigning alarm categories to alarm relays K1/K2 ............................ 11
3.2.7 Time delays t, ton and toff ........................................................................... 11
3.2.8 Start-up delay t ............................................................................................... 11
3.2.9 Response delay ton ....................................................................................... 11
3.2.10 Delay on release toff ...................................................................................... 11
3.2.11 Password protection (on, OFF) ................................................................. 12
3.2.12 Factory setting FAC ...................................................................................... 12
3.2.13 Erasable history memory ............................................................................ 12
3.2.14 Alarm LEDs show which relay is in the alarm state ........................... 12
3.2.15 Starting a device using a simulated alarm S.AL ................................. 12
4. Installation, connection and commissioning ........................................... 15

Table of Contents
4TGH1444en/04.2011
4.1 Installing the device ..................................................................................... 16
4.1.1 DIN rail mounting: ......................................................................................... 16
4.1.2 Screw mounting ............................................................................................ 16
4.2 Wiring of the device ..................................................................................... 17
4.3 Commissioning / factory setting ............................................................. 20
5. Operation and setting .................................................................................. 21
5.1 Getting to know the user interface ......................................................... 21
5.2 Understanding standard display indications ...................................... 23
5.3 Getting to know keys and key functions .............................................. 24
5.4 Querying values ............................................................................................. 25
5.5 Starting the self test manually .................................................................. 27
5.6 Clearing the fault memory ......................................................................... 27
5.7 Calling up or leaving the menu ................................................................ 27
5.8 Carrying out settings in the menu .......................................................... 27
5.8.1 Password protection .................................................................................... 27
5.8.2 Selecting menu items .................................................................................. 29
5.8.3 Carrying out settings in the menu item AL .......................................... 31
5.8.4 Carrying out settings in the menu item out ........................................ 35
5.8.5 Carrying out settings in the menu item t ............................................. 41
5.8.6 Carrying out settings in the menu item SEt ......................................... 42
5.8.7 Querying information in menu item INF .............................................. 44
5.8.8 Querying and clearing fault memory in the menu item HIS ......... 45
6. Technical data ................................................................................................ 47
6.1 Data in tabular form ..................................................................................... 47
6.2 Standards, approvals and certifications ................................................ 50
6.3 Ordering information ................................................................................... 51
INDEX .................................................................................................................... 53

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1. How to use this documentation effectively
1.1 How to use this manual
This operating manual is designed for skilled persons working in electrical en-
gineering and electronics and must always be kept in an easily accessible lo-
cation near to the equipment.
In order to make it easier for you to find specific text passages or references in
this manual and for reasons of comprehensibility, important information is
emphasised by symbols. The meaning of these symbols is explained below:
Information calling attention to hazards are marked
with this warning symbol.
Information intended to assist the user to make optimum
use of the product are marked with the Info symbol.

How to use this documentation effectively
6TGH1444en/04.2011

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TGH1444en/04.2011
2. Safety
2.1 General
In addition to this manual, the documentation of the device includes a docu-
ment entitled "Important safety instructions for Bender products“.
2.2 Intended use
The voltage monitor VMD423 is used in 3(N)AC systems in accordance with
VDE V 0126-1-1 for undervoltage, overvoltage, underfrequency and overfre-
quency monitoring. The device is suitable for the nominal voltage range Un=
0...500 V in the frequency range 40...65 Hz.
The VMD423 requires a separate supply voltage Us.
2.3 Skilled person
Only electrically skilled persons are authorised to install and commission this
device. Electrically skilled persons are those who have the relevant education,
knowledge and experience, as well as knowledge of the relevant safety stand-
ards and who are able to perceive risks and to avoid hazards which electricity
can create when work activities are carried out on electrical installations. The
electrically skilled person is specially trained for carrying out work activities in
his specific working environment and has a thorough knowledge of the rele-
vant standards and regulations.
In Germany, an electrically skilled person must meet the requirements of the
accident prevention regulation BGV A3. In other countries the applicable reg-
ulations have to be observed and followed.

Safety
8TGH1444en/04.2011
2.4 Safety information on work activities on electrical in-
stallations
Touching live parts will cause danger of electric shock
with fatal consequences! All work activities on electrical
installations as well as installation activities, commis-
sioning activities and work activities with the device in
operation may only be carried out by electrically skilled
persons!
Danger of electric shock!
Unprofessional work activities on electrical installations
may result in a threat of danger to life and limb!

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3. Function
3.1 Device features
 The VMD423 requires a separate supply voltage Us
 Monitoring for undervoltage and overvoltage and underfrequency and
overfrequency in 3(N)AC systems of AC 0...500 V / 0...288 V
 Monitoring of overvoltage U2 by average determination of the latest
10-minute measuring interval
 Asymmetry, phase failure and phase sequence monitoring
 Start-up delay, response delay and delay on release
 Adjustable switching hysteresis for the voltage to be monitored
 r.m.s. value measurement AC + DC
 Digital measured value display via multi-functional LC display
 LEDs: Power On, Alarm1 and Alarm2
 Fault memory for the operating value
 Cyclical self monitoring
 Internal test/reset button
 Two separate alarm relays (one changeover contact each)
 N/C or N/O operation and fault memory behaviour selectable
 Password protection for device settings
 Sealable transparent cover
 Available with screw-type or push-wire terminals

Function
10 TGH1444en/04.2011
3.2 Function
Once the supply voltage is applied, the start-up delay plus response delay (t +
ton1/2) begins. Throughout this time, an alarm is output via alarm LEDs and re-
lays. Measured voltage and frequency values being changed during this start-
up period t do not influence the alarm LEDs and the state of the alarm relays.
The devices utilise several separately adjustable measuring channels (over-
voltage/undervoltage, overfrequency/underfrequency). When the measured
value exceeds or falls below the response value, the alarm relays switch and
the alarm LEDs light up. When the measured value exceeds or falls below the
release value (response value plus hysteresis) after the alarm relays have
switched, the selected release delay toff begins. When toff has elapsed, the
alarm relays switch back to their initial position. With the fault memory acti-
vated, the alarm relays do not change their actual state until the reset button
R is pressed.
3.2.1 Calculating the average value of overvoltage
The overvoltage U2 is determined by calculating an average value of the last
10-minute measuring interval.
Always the highest average value U2 of each of the three voltages monitored
between L1-N, L2-N, L3-N will be indicated.
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 tested during this time.
3.2.3 Manual self test
Pressing the test button for > 1.5 s causes the device to carry out a self test
where the internal functional errors are determined and shown on the display
as error codes. The alarm relays are not tested during this time.
While the test button T is pressed and held down, all device-related display el-
ements appear on the display.

Function
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TGH1444en/04.2011
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.
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". For details about alarm category assignment to the respective re-
lays refer to the submenu out description on page 37.
3.2.7 Time delays t, ton and toff
The times t, ton and toff described in the following delay the output of alarms
via the LEDs and relays.
3.2.8 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).
3.2.9 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.
3.2.10 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

Function
12 TGH1444en/04.2011
alarm state signal for the set duration.
3.2.11 Password protection (on, OFF)
By default, the password protection is activated (on). Settings are only possi-
ble after entering the correct password (0...999). If you cannot operate your
device because you cannot remember your password, please contact in-
[email protected].
3.2.12 Factory setting FAC
After activating the factory setting, all settings previously changed are reset to
delivery status.
3.2.13 Erasable history memory
The first alarm value to occur is 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.
3.2.14 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 as-
signed 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.
3.2.15 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

Function
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(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 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

Function
14 TGH1444en/04.2011

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4. Installation, connection and commissioning
Danger of electric shock! Make sure that the installation
area is disconnected from any electrical source before
starting installation works and that the nominal voltage
and supply voltage specified in the relevant data sheet
are observed!

Installation, connection and commissioning
16 TGH1444en/04.2011
4.1 Installing the device
Fig. 4.1: Dimension diagram and drawing for screw fixing
4.1.1 DIN rail mounting:
1. Snap the rear mounting clip of the device into place in such a way that
a safe and tight fit is ensured.
4.1.2 Screw mounting
1. Use a tool to move the rear mounting clips (a second mounting clip
required, see ordering information) to a position that it projects
beyond the enclosure.
2. Fix the device using two M4 screws.
100 mm
116 mm
Zubehör/
Accessory
90 mm
45
67,5
36 mm
31,1
47,5
70,5
2
2

Installation, connection and commissioning
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4.2 Wiring of the device
Connect the device according the wiring diagram.
Fig. 4.2: Wiring diagram
1
2
3
Connect the conductor to the push-wire ter-
minals according to the drawing.
Terminal Connections
A1, A2 Connection to the sup-
ply voltage Us
L1, L2, L3, (N) Connection to the sys-
tem to be monitored
11, 12, 14 Alarm relay K1
21, 22, 24 Alarm relay K2

Installation, connection and commissioning
18 TGH1444en/04.2011
Example: Application of a photovoltaic system encountered in practice
Fig. 4.3: Application of an VMD423-D-2 in a photovoltaic system.
VMD423
A2
426
A1
135
=
~
VMD423

Installation, connection and commissioning
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TGH1444en/04.2011
Connect the terminals A1/A2 and L1/L2/L3 of the VMD423 always to the sup-
ply side of the system to be monitored (but not to the inverter side of the dis-
connecting relay).
Single-fault tolerance
In order to ensure single-fault tolerance, private power generating systems
must be designed in a way that they meet the requirements of
DIN V VDE V 0126-1-1:2006-2. A single fault in the tripping circuit must
not lead to a loss of the disconnection function. The monitoring circuit (as il-
lustrated on page 18) for grid disconnection of power generating systems is
to be installed at the point of supply. The relays integrated in the two
VMD423-D-2 devices (example K1) are to be connected in series.
Take appropriate steps to prevent the sticking of
contactor contacts!

Installation, connection and commissioning
20 TGH1444en/04.2011
4.3 Commissioning / factory setting
Material damage by improper connection of the device!
Prior to commissioning make sure that the device is
properly connected!
Undervoltage < U:
Overvoltage > U1:
Overvoltage > U2 (10 min.):
Hysteresis U:
Underfrequency < Hz
Overfrequency > Hz
Hysteresis frequency (Hys Hz):
Fault memory M:
Operating principle K1
(< U, > U1, Asy, < f, > f, S.AL):
Operating principle K2
(Err, < U, > U1, > U2, Asy,
< f, > f, PHS, S.AL):
AL1/AL2 indicate the alarm
state of K1/K2 (LEd):
Alarm to K1/K2 (S.AL) when
the device is started:
Asymmetry:
Phase sequence monitoring:
Start-up delay:
Response delay:
Delay on release:
Method of measurement:
Password:
184 V
264 V
253 V
5 %
47.5 Hz
50.2 Hz
0.1 Hz
OFF
N/C operation (n.c.)
N/C operation (n.c.)
OFF
on
30 %
R, on
t = 30 s
ton1 = 0,1 s
ton2 = 0,1 s
toff = 30 s
3n (phase voltage measurement)
126, On