Bender VMD420-DM User manual

Manual
EN
VMD420-DM
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: D238 V2.2x
VMD420-DM_D00227_01_M_XXEN/07.2015

Bender GmbH & Co. KG
Londorfer Str. 65 • 35305 Gruenberg • Germany
Postfach 1161 • 35301 Gruenberg • Germany
Tel.: [phone]
Fax: [phone]
Email: [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
3
VMD420-DM_D00227_01_M_XXEN/07.2015
1. How to use this documentation effectively ................................................ 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 ............................................................................................................... 9
3.2.1 Preset function ............................................................................................... 10
3.2.2 Automatic self test ........................................................................................ 11
3.2.3 Manual self test .............................................................................................. 11
3.2.4 Functional faults ............................................................................................ 11
3.2.5 Fault memory ................................................................................................. 11
3.2.6 Start-up delay t ............................................................................................... 12
3.2.7 Password protection (on, OFF) ................................................................. 12
3.2.8 Factory setting FAC ...................................................................................... 12
3.2.9 Erasable history memory ............................................................................ 12
3.2.10 Interface option M ........................................................................................ 12
3.2.11 Menu item AnA for interface configuration ........................................ 13
4. Installation, connection and commissioning ........................................... 15
4.1 Fast commissioning for Un = 400 V, 50 Hz ........................................... 15
4.2 Installing the device ..................................................................................... 17
4.2.1 DIN rail mounting .......................................................................................... 17
4.2.2 Screw fixing ..................................................................................................... 17

Table of Contents
4VMD420-DM_D00227_01_M_XXEN/07.2015
4.3 Wiring of the device ..................................................................................... 18
4.4 Commissioning preset function/factory setting ................................ 19
5. Operation and setting .................................................................................. 21
5.1 Getting to know the user interface ......................................................... 21
5.2 Understanding of standard display indications ................................. 22
5.3 Getting to know keys and key functions .............................................. 23
5.4 Querying values ............................................................................................. 24
5.5 Starting the self test manually .................................................................. 25
5.6 Clearing the fault memory ......................................................................... 26
5.7 Calling up or leaving the menu ................................................................ 26
5.8 Carrying out settings in the menu .......................................................... 26
5.8.1 Selecting menu items .................................................................................. 26
5.8.2 Carrying out settings in the menu item AL .......................................... 28
5.8.3 Carrying out settings in the menu item out ........................................ 32
5.8.4 Carrying out settings in the menu item t ............................................. 36
5.8.5 Carrying out settings in the menu item SEt ......................................... 37
5.8.6 Querying information in menu item INF .............................................. 40
5.8.7 Querying and clearing fault memory in the menu item HIS ......... 41
6. Technical data ................................................................................................ 43
6.1 Data in tabular form ..................................................................................... 43
6.2 Current and voltage curves of the analogue interface .................... 47
6.3 Standards, approvals and certifications ................................................ 48
6.4 Ordering information ................................................................................... 48
INDEX .................................................................................................................... 49

5
VMD420-DM_D00227_01_M_XXEN/07.2015
1. How to use this documentation effectively
This manual is intended for experts in electrical engineering and
electronics!
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
emphasized by symbols. The meaning of these symbols is explained below:
The 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
to make optimum use of the product.
DANGER
WARNING
CAUTION

How to use this documentation effectively
6VMD420-DM_D00227_01_M_XXEN/07.2015

7
VMD420-DM_D00227_01_M_XXEN/07.2015
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 VMD420 monitors 3(N)AC systems in the frequency
range 15…460 Hz for undervoltage, overvoltage, underfrequency and over-
frequency. The devices are designed for the nominal voltage range Un=
0…500 V. Separate supply voltage Us is required.
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
8VMD420-DM_D00227_01_M_XXEN/07.2015
2.4 Safety information on work activities on electrical
installations
Danger of electric shock!
Unprofessional work activities on electrical installations may
result in a threat of danger to life and limb!
All work activities on electrical installations as well as
installation activities, commissioning activities and work
activities with the device in operation may only be carried
out by electrically skilled persons!
DANGER

9
VMD420-DM_D00227_01_M_XXEN/07.2015
3. Function
3.1 Device features
 The VMD420 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
 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
 User-configurable analogue interface
3.2 Function
Once the supply voltage is applied, the start-up delay "t" begins. Measured
values changing during this time do not influence the alarm LEDs.
The devices provide two separately adjustable response values
(overvoltage/undervoltage). When the measured value exceeds (Alarm 1) or
falls below the response value (Alarm 2), the alarm LEDs light up. When the
measured value exceeds or falls below the release value (response value plus

Function
10 VMD420-DM_D00227_01_M_XXEN/07.2015
hysteresis), the alarm LEDs go out. When the fault memory is activated, the
alarm LEDs remain in the alarm 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-DM
Measuring principle Un
Preset
operating
range
Response
value
< U
Response
value
> U
Phase-to-phase volt-
age measurement:
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 volt-
age 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
11
VMD420-DM_D00227_01_M_XXEN/07.2015
If the measured voltage is not within the preset operating range listed in the
table, the message "AL not Set“ appears on the display. In this case, 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 set-
ting“.
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.
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.
While the test button T is pressed and held down, all device-related display el-
ements 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
12 VMD420-DM_D00227_01_M_XXEN/07.2015
3.2.6 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).
3.2.7 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 be-
cause you cannot remember your password, please contact info@bender-
service.com.
3.2.8 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.
3.2.9 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.
3.2.10 Interface option M
This option provides an analogue interface with galvanic isolation, but does
not provide an alarm relay. One of three output signals can be selected from
the associated menu. Only the output that has been selected via software may
be connected:
Output signal Purpose of use
DC 0…400 μA Current output for Bender measuring instruments of the 96.. series
DC 0/4…20 mA Standardised current output with selectable current ranges
DC 0…10 V Standardised voltage signal

Function
13
VMD420-DM_D00227_01_M_XXEN/07.2015
3.2.11 Menu item AnA for interface configuration
For details about the setting of the analogue interface via software refer to
page 32.
Display Measured variable 100 % value
< L1L2L3 500 V lowest voltage of all 3
phases adjustable in the range of 7…500 V
> L1L2L3 500 V highest voltage of all 3
phases adjustable in the range of 7…500 V
L1 500 V voltage L1 adjustable in the range of 7…500 V
L2 500 V voltage L2 adjustable in the range of 7…500 V
L3 500 V voltage L3 adjustable in the range of 7…500 V
ASY 50 % asymmetry adjustable in the range of 10…100 %
100 Hz frequency adjustable in the range of 10…2000
Hz
PHS l phase sequence anticlockwise field
> L1L2L3 U AL highest voltage of all 3
phases response value >U overvoltage
> L1 U AL voltage L1 response value >U overvoltage
> L2 U AL voltage L2 response value >U overvoltage
> L3 U AL voltage L3 response value >U overvoltage
> ASY AL asymmetry response value ASY

Function
14 VMD420-DM_D00227_01_M_XXEN/07.2015

15
VMD420-DM_D00227_01_M_XXEN/07.2015
4. Installation, connection and commissioning
4.1 Fast commissioning 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 response values (Preset) after the first connec-
tion to the nominal voltage.
2. Make sure that the voltage monitor is in the delivery status (factory set-
ting 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 (page 18). The following predefined response values
will be set automatically:
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!
VMD420
Un, fn
Preset
operating
range
Response
value
< U, < f
Response
value
> U, > f
400 V
(L1, L2, L3) 340 V…440 V 340 V 440 V
50 Hz 47…53 Hz 49 Hz 51 Hz
DANGER

Installation, connection and commissioning
16 VMD420-DM_D00227_01_M_XXEN/07.2015
4. The currently measured phase-to-phase voltage between L1 and L2
appears on the display. 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 page 10.
For resetting the voltage monitor to its factory settings refer to page 12.

Installation, connection and commissioning
17
VMD420-DM_D00227_01_M_XXEN/07.2015
4.2 Installing the device
Fig. 4.1: Dimension diagram and drawing for screw fixing
4.2.1 DIN rail mounting
1. Open the front plate cover at the lower part marked by an arrow.
2. Snap the rear mounting clip of the device into place in such a way that
a safe and tight fit is ensured.
4.2.2 Screw fixing
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
18 VMD420-DM_D00227_01_M_XXEN/07.2015
4.3 Wiring of the device
Connect the device according the wiring diagram.
1
2
3
M+
µA mA V
Connect the conductor to the push-wire
terminals according to the drawing.
Terminal Connections
A1, A2 Connection to the supply
voltage Us
L1, L2, L3, (N) Connection to the system to
be monitored
M+ (common) positive pole of
the analogue interface
μA Current output 0…400 μA
mA Current output 0/4…20 mA
VVoltage output 0…10 V

Installation, connection and commissioning
19
VMD420-DM_D00227_01_M_XXEN/07.2015
4.4 Commissioning preset function/factory setting
Material damage by improper connection of the device! Prior
to commissioning make sure that the device is properly
connected!
After connecting a brand-new VMD420… to a standard
system of Un= 400 V 50 Hz, the response 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.
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
CAUTION

Installation, connection and commissioning
20 VMD420-DM_D00227_01_M_XXEN/07.2015
Factory setting
Hysteresis U:
Underfrequency < Hz
Overfrequency > Hz
Hysteresis frequency (Hys Hz):
Fault memory M:
Interface type
100 % reference:
Asymmetry:
Phase sequence monitoring:
Start-up delay:
Method of measurement:
Password:
5 %
OFF
OFF
0.2 Hz
on
0…20 mA
U > 500 V
30 %
OFF
t = 0 s
3Ph (phase-to-phase
voltage measurement)
0, Off