Bender VMD460-NA User manual

Manual
EN
VMD460-NA
Network and system protection (NS protection) for monitoring
the power feed-in of power generation systems
Software version: D398 V1.2x
Display software version: D403 V2.2
VMD460-NA_D00001_05_M_XXEN/01.2020 Manual EN

Bender GmbH & Co. KG
Postfach 1161 • 35301 Gruenberg • Germany
Londorfer Str. 65 • 35305 Gruenberg • Germany
Tel.: [phone] • Fax: [phone]
E-Mail: [e-mail] • www.bender.de
©Bender GmbH & Co. KG
All rights reserved.
Reprinting only with permission
of the publisher.
Subject to change!
Photos: Bender archive and Bendersystembau archive

3
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VMD460-NA_D00001_05_M_XXEN/01.2020
1. General instructions .................................................................................................... 7
1.1 How to use this manual ................................................................................................ 7
1.2 Technical support: service and support .................................................................. 7
1.3 Training courses ............................................................................................................... 8
1.4 Delivery conditions, warranty and liability ............................................................. 9
1.5 Inspection, transport and storage ............................................................................. 9
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 Device-specific instructions ....................................................................................... 12
2.4 Intended use ................................................................................................................... 12
3. Functional description ............................................................................................. 13
3.1 Measurement functions .............................................................................................. 13
3.1.1 Monitoring of different system types:
1AC, 3AC, 3NAC ...................................................................................................... 13
3.1.2 Continuous monitoring of the phase voltage and
line-to-line voltage ................................................................................................ 13
3.2 Disconnection ................................................................................................................. 14
3.3 (Re)connection and
special reconnections .................................................................................................. 14
3.3.1 (Re)connection and monitoring of the conditions .................................... 14
3.3.2 Exceptions of automatic (re-)connection ...................................................... 14
3.3.3 Special reconnections .......................................................................................... 14
3.4 Protective and monitoring functions ..................................................................... 15
3.4.1 Voltage protection functions U<, U<<, U>> and U> ................................ 15
3.4.2 Frequency protection functions f<, f<<, f>> and f> ................................. 16
3.4.3 Islanding detection df/dt (ROCOF), vector shift detection ..................... 17
3.4.4 Unbalance detection ............................................................................................ 18
3.4.5 Monitoring of the tripping circuits and interface switches
by means of contact feedback .......................................................................... 18
3.4.6 Remote trip: remote disconnection via ripple-control receiver ........... 19
3.4.7 Test function for checking the tripping circuit, the interface
switch and for determining the connection times .................................... 19
3.4.8 Automatic self test ................................................................................................. 20

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4VMD460-NA_D00001_05_M_XXEN/01.2020
3.5 Other functions ............................................................................................................. 20
3.5.1 Password protection ............................................................................................ 20
3.5.2 Protection against unauthorised access - sealable enclosure .............. 21
3.5.3 Reset device to factory settings ....................................................................... 21
3.5.4 History memory of the last 300 faults
with time stamp (real-time clock) ................................................................... 21
4. Installation, connection and commissioning ....................................................... 23
4.1 Unpacking ....................................................................................................................... 23
4.2 Fuses .................................................................................................................................. 23
4.3 Installation instructions .............................................................................................. 24
4.4 Schematic diagram ...................................................................................................... 24
4.5 Dimension diagram VMD460-NA ........................................................................... 25
4.6 DIN rail mounting ......................................................................................................... 25
4.7 Screw mounting ............................................................................................................ 25
4.8 Wiring diagrams ............................................................................................................ 26
4.8.1 VDE-AR-N 4105:2018 – basic program 4105_2 ......................................... 26
4.8.2 VDE-AR-N 4105:2018 – basic program 4105_2 with several
generating units .................................................................................................... 28
4.8.3 VDE-AR-N 4110:2018-11 – basic program 4110 ......................................... 30
4.8.4 EREC G99, G98, C10/11, DIN V VDE V 0126-1-1 ;
basic programs G98, G99, C10/11, 0126 ....................................................... 32
4.8.5 CEI 0-21 ..................................................................................................................... 34
4.8.6 Details regarding the digital inputs (D1…D4, RT1) .................................. 36
4.8.7 Further standards .................................................................................................. 37
4.9 Commissioning ............................................................................................................. 39
4.10 Tripping circuit test by the system installer ........................................................ 39
5. Operation and settings ............................................................................................ 40
5.1 User interface ................................................................................................................. 40
5.2 Display indications ....................................................................................................... 41
5.2.1 Standard display .................................................................................................... 41
5.2.2 Info display .............................................................................................................. 41
5.2.3 Alarm display .......................................................................................................... 41
5.2.4 Menu display .......................................................................................................... 42
5.2.5 Toggling between the individual displays .................................................. 42
5.3 INFO button .................................................................................................................... 43
5.4 MENU button ................................................................................................................. 43
5.4.1 Alarm/ meas. values ............................................................................................. 44
5.4.2 History ....................................................................................................................... 45
5.4.3 Settings ..................................................................................................................... 46
5.4.4 System ....................................................................................................................... 46
5.4.5 Info ............................................................................................................................. 48

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VMD460-NA_D00001_05_M_XXEN/01.2020
6. Basic programs .......................................................................................................... 49
6.1 VDE-AR-N 4105:2018-09 .............................................................................................. 51
6.2 VDE-AR-N 4105:2011-08 ............................................................................................. 53
6.3 VDE-AR-N 4110:2018-11 .............................................................................................. 55
6.4 BDEW guideline 2008 ............................................................................................... 57
6.5 DIN V VDE V 0126-1-1:2006-02/A1:2012-02 ........................................................ 59
6.6 CEI 0-21(:2012-06, :V1:2012-12, :V2:2013-12, :2014-09, :V1:2014-12;
2016-07, V1:2017-07) ................................................................................................... 61
6.7 C10/11:2006-06 ............................................................................................................. 64
6.8 G98/1-4:2019 .................................................................................................................. 66
6.9 G59/3:2013, G83/2:2012 .............................................................................................. 68
6.10 G99/1-4:2019 .................................................................................................................. 70
6.11 G59/2:2010, -1/2011 .................................................................................................... 72
7. Maintenance, troubleshooting, messages ........................................................... 74
7.1 Recurrent test of the tripping circuit by the system operator ...................... 74
7.2 Manual self test .............................................................................................................. 74
7.3 Messages and malfunctions ...................................................................................... 76
7.4 LEDs .................................................................................................................................... 77
8. Technical data VMD460-NA .................................................................................... 78
8.1 Standards, approvals and certifications ................................................................ 81
8.2 Ordering details .............................................................................................................81
INDEX .................................................................................................................. 83

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VMD460-NA_D00001_05_M_XXEN/01.2020

7
VMD460-NA_D00001_05_M_XXEN/01.2020
1. General instructions
1.1 How to use this manual
We have used the following symbols to identify important instructions and informa-
tion:
1.2 Technical support: service and support
For commissioning and troubleshooting Bender offers:
First level support
Technical support by phone or e-mail for all Bender products
•Questions about specific customer applications
•Commissioning
•Troubleshooting
Telephone: [phone]*
Fax: [phone]:-259 Germany: 0700BenderHelp (telephone and fax) E-
mail: [email protected]
This manual is intended for qualified personnel working in electrical en-
gineering and electronics!
This signal word indicates that there is a high risk of danger that will re-
sult in death 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

General instructions
8VMD460-NA_D00001_05_M_XXEN/01.2020
Repair service
Repair, calibration, update and replacement service for all Bender products
•Repair, calibration, testing and analysis
•Hardware and software update
•Delivery of replacement devices for faulty or incorrectly delivered devices
•Extended warranty with in-house repair service or replacement device at no extra cost
Telephone: [phone]** (technical issues)/
[phone]**, -785** (commercial issues)
Fax: [phone]
E-mail: [email protected]
Please send the devices for repair to the following address:
Bender GmbH, Repair-Service, Londorfer Straße 65, 35305 Grünberg
Field service
On-site service for all Bender products
•Commissioning, parameter setting, maintenance, troubleshooting
•Analysis of the electrical installation in the building (power quality test, EMC test, ther-
mography)
•Practical training courses for customers
Telephone: [phone]**, -762 ** (technical issues)/
[phone]** (commercial issues)
Fax: [phone]
E-mail: [email protected]
Internet: www.bender.de
*Available from 7.00 a.m. to 8.00 p.m. on 365 days of the year (CET/UTC +1)
**Mo-Thu 7.00 a.m. - 4.00 p.m., Fr 7.00 a.m. - 1.00 p.m
1.3 Training courses
Bender provides training on how to use the universal measuring device.
Current dates of training courses and workshops can be found on the Internet at http:/
/www.bender.de -> Know-how -> Seminars.

General instructions
9
VMD460-NA_D00001_05_M_XXEN/01.2020
1.4 Delivery conditions, warranty and liability
The conditions of sale and delivery set out by Bender GmbH apply.
For software products, the "Softwareklausel zur Überlassung von Standard- Software
als Teil von Lieferungen, Ergänzung und Änderung der Allgemeinen Lieferbedingun-
gen für Erzeugnisse und Leistungen der Elektroindustrie" (software clause in respect of
the licensing of standard software as part of deliveries, modifications and changes to
general delivery conditions for products and services in the electrical industry) set out
by the ZVEI (Zentralverband Elektrotechnik- und Elektronikindustrie e.V., (German Elec-
trical and Electronic Manufacturers' Association) also applies.
Conditions of sale and delivery can be obtained from Bender in printed or electronic for-
mat.
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 it is protected from dust, humidity and
spray or dripping water, and in which the specified storage temperatures can be as-
sured.
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 following 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, 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 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 recommended by the manu-
facturer.
This operating manual, especially the safety instructions, must be observed by all per-
sonnel working on the device. Furthermore, the rules and regulations that apply for ac-
cident prevention at the place of use must be observed.

General instructions
10 VMD460-NA_D00001_05_M_XXEN/01.2020
1.7 Disposal
Abide by the national regulations and laws governing the disposal of this device. Ask
your supplier if you are not sure how to dispose of the old equipment.
The directive on waste electrical and electronic equipment (WEEE directive) and the di-
rective on the restriction of certain hazardous substances in electrical and electronic
equipment (RoHS directive) apply in the European Community. In Germany, these pol-
icies are implemented through the "Electrical and Electronic Equipment Act" (ElektroG).
According to this, the following applies:
•Electric and electronic equipment are not to be included in household waste.
•Batteries and accumulators are not to be included in household waste but must be dis-
posed of in accordance with the regulations.
•Old electrical and electronic equipment from users other than private households
which was introduced to the market after 13th 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 website at
www.bender.de -> Service & support.

11
VMD460-NA_D00001_05_M_XXEN/01.2020
2. Safety instructions
2.1 General safety instructions
Part of the device documentation in addition to this manual is the enclosed "Safety in-
structions 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.
Read the operating manual before starting to install, connect and
commission the device. After successful commissioning, keep the man-
ual within easy reach for future reference.
Only qualified personnel are permitted to carry out the work neces-
sary to install, commission and run a device or system.
DANGER
Risk of fatal injury from 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
Before installing the device and before working on the connections of
the device, make sure that the system is de-energised. The rules for
working on electrical systems must be observed.

Safety instructions
12 VMD460-NA_D00001_05_M_XXEN/01.2020
2.3 Device-specific instructions
2.4 Intended use
The VMD460-NA voltage and frequency monitoring relay is used for network and sys-
tem protection (NS protection) of CHP plants,
wind power stations , hydroelectric power
stations and photovoltaic systems feeding power into the network. If inadmissible volt-
age and frequency values occur on the supply side, the VMD460-NA disconnects the
generating plant from the public network by means of the interface switch.
In order to meet the requirements of applicable standards, customised parameter set-
tings must be made on the equipment in order to adapt it to local equipment and op-
erating conditions. Please heed the limits of the area of application indicated in the
technical specifications.
In the context of VDE-AR-N 4110:2018-11, the VMD460-NA can be used as decoupling
protection equipment for the generating unit or as higher-level decoupling protection,
the latter, however, only if the QU protection function (directional reactive power und-
ervoltage protection) may be dispensed with. According to VDE-AR-N 4110:2018-11
chapter 10.3.3.4 par. 5, this is possible after consultation with the network operator and
under the following conditions:
•Generating plants with limited dynamic network support or
•Generating plants < 1 MVA
Both types of application are possible when the generating plant is connected to the
busbar of a substation (MV-busbar) or when the generating plant is connected to the
medium-voltage network (MV-network).
Any other use than that described in this document is regarded as improper.
Unauthorised device access
After commissioning, the essential settings of the VMD460-NA have to
be protected against unauthorised changes by a password. If the
password protection is not used, the device has to be sealed.
Inspection
If the device is overloaded by overvoltage or a short-circuit current
load, it must be checked and replaced if necessary.

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VMD460-NA_D00001_05_M_XXEN/01.2020
3. Functional description
The VMD460-NA is intended for protecting the network and the (generating) plant from
inadmissible operating states and for causing a disconnection. For this purpose, the
VMD460-NA is designed according to the principles of single-fault tolerance. This oc-
curs as soon as at least one of the activated protective or monitoring functions trips.
If the (re-)connection conditions are fulfilled, the VMD460-NA enables the coupling of
the generating plant to the network.
Details are regulated by the applicable (application) standard and guideline.
•Which protective and monitoring functions are used or are active/inactive.
•How the protective and monitoring functions are parameterised in detail.
•Further details regarding calculation methods and device behaviour
•Whether the (re-)connection takes place automatically or after manual acknowledge-
ment.
The country-specific (application) standards and guidelines are stored in the device as
selectable basic programs.
3.1 Measurement functions
3.1.1 Monitoring of different system types:
1AC, 3AC, 3NAC
The VMD460-NA is able to monitor different system types (1AC, 3AC, 3NAC). The system
type is defined via the "Coupling" parameter.
In addition, the nominal system voltage is set via the "U(L-N)/U(L-L)" parameter.
3.1.2 Continuous monitoring of the phase voltage and line-to-line voltage
The VMD460-NA continuously measures the available phase voltages and line-to-line
voltages as well as the power frequency. It also calculates the measured quantities rel-
evant for the protective and monitoring functions.

Functional description
14 VMD460-NA_D00001_05_M_XXEN/01.2020
3.2 Disconnection
As soon as at least one of the activated protective or monitoring functions has tripped,
the VMD460-NA issues a disconnection command via contacts K1 and K2 to the con-
nected interface switches. First K1 and then K2 are tripped with a delay of 50 ms.
3.3 (Re)connection and
special reconnections
3.3.1 (Re)connection and monitoring of the conditions
If the (re)connection conditions are fulfilled and the delay time for connection has
elapsed, the VMD460-NA enables the coupling of the generating plant to the network
automatically.
If no connection value is set, the respective response value of the corresponding pro-
tective function applies. It must be ensured that the response values of the protective
functions do not collide with those of the connection conditions.
3.3.2 Exceptions of automatic (re-)connection
In the event of a detected fault in one of the tripping circuits (interface switch fault), the
connection is controlled via the parameter "Menu -> Settings -> Dig. in. -> Fault mem-
ory".
•Fault memory disabled:
If the fault is no longer present and the connection conditions have been fulfilled, the
VMD460-NA reconnects after the delay time for connection has elapsed. Up to 3 auto-
matic reconnection attempts are made in the event of a repeated interface switch fault.
If these also fail, a manual RESET is required.
•Fault memory enabled:
If a fault is detected, there is no automatic (re-)connection or connection attempt. The
fault must be acknowledged manually via the RESET button to enable a connection.
3.3.3 Special reconnections
3.3.3.1 Reconnection after short interruptions
Menu: 3. Settings-> 1. General ->:
5. t
SHORT INT.
Special disconnection behaviour VDE-AR-N 4105:2018-11 and
CEI 0-21
Contrary to the above behaviour, K1 is tripped and K2 remains ener-
gised instead. A disconnection signal is only output via relay K2 if a
fault is detected in tripping circuit 1.

Functional description
15
VMD460-NA_D00001_05_M_XXEN/01.2020
6. t
(ON) SHORT INT.
A short interruption occurs when the reconnection conditions are fulfilled within a
short period of time (tSHORT INT.) after disconnection.
In case of a short interruption, automatic reconnection takes place with a shortened de-
lay time (t(ON) SHORT INT.).
3.3.3.2 Reconnection after df/dt detection (ROCOF)
Menu: 3. Settings -> 4. df/dt ->:
6. t
(ON)
If the VMD460-NA has been disconnected due to a df/dt detection, it reconnects after
the separate delay time for connection t(ON) has elapsed. If t(ON) is set to "off", reconnec-
tion takes place after the delay time for connection t(ON)NORMAL has elapsed.
3.3.3.3 Reconnection after vector shift detection
Menu: 3. Settings-> 5. Vect.shift. ->:
4. t
(ON)
If the VMD460-NA has been disconnected due to a df/dt detection, it reconnects after
the separate delay time for connection t(ON) has elapsed. If t(ON) is set to "off", reconnec-
tion takes place after the delay time for connection t(ON)NORMAL has elapsed.
3.4 Protective and monitoring functions
3.4.1 Voltage protection functions U<, U<<, U>> and U>
The following voltage protection functions are implemented in the VMD460-NA:
•Rise-in-voltage protection: U>> and U>
•Voltage drop protection: U<<, U<
Depending on the coupling, all available phase voltages and line-to-line voltages (UL1-
N, UL2-N, UL3-N, UL1-L2, UL2-L3 and UL3-L1) are evaluated separately by the voltage protec-
tion functions (OR operation).
3.4.1.1 Rise-in-voltage protection, U>> and U>
Menu: 3. Settings-> 2. Voltage ->:
1. U>> and 2. t
(OFF)
3. U> and 4. t
(OFF)
In the case of rise-in-voltage protection, the measured value is compared to the re-
sponse value (U>> and U>). If the measured value exceeds the response value for the
duration of the corresponding response delay, the protective function is tripped. If the
measured value falls below the response value, the protective function is reset.
The measured value is equal to the instantaneous value.
The implementation of the rise-in-voltage protection U> depends on the set applica-
tion standard.

Functional description
16 VMD460-NA_D00001_05_M_XXEN/01.2020
Please observe that:
In the following application standards, the U> measured value corresponds to a 10-
minute mean value, which is calculated by averaging 3-second measuring intervals
over 10 minutes. The mean value is determined as follows:
•CEI 0-21
The measured value is a root-mean-square value acc. to IEC EN 61000-4-30.
•VDE-AR-N 4105 and DIN V VDE V 0126-1-1
The measured value is an arithmetical average
3.4.1.2 Voltage drop protection, U>> and U>
Menu: 3. Settings-> 2. Voltage ->:
7. U< and 8. t
(OFF)
9. U<< and 10. t
(OFF)
In the case of voltage drop protection, the measured value is compared to the response
value (U< or U<<). If the measured value falls below the response value for the duration
of the corresponding response delay (t(OFF)), the protective function is tripped.
If the measured value exceeds the response value, the protective function is reset.
The measured value is equal to the instantaneous value.
3.4.2 Frequency protection functions f<, f<<, f>> and f>
The following frequency protection functions are implemented in the VMD460-NA:
•Frequency increase protection f>, f>>
•Frequency decrease protection f<, f<<
3.4.2.1 Frequency decrease protection f<, f<<
Menu: 3. Settings-> 3. Frequency ->:
7. f< and 8. t
(OFF)
9. f<< and 10. t
(OFF)
In the case of frequency decrease protection, the measured value is compared to the re-
sponse value (f< or f<<). If the measured value falls below the response value for the du-
ration of the corresponding response delay (t(OFF)), the protective function is tripped.
If the measured value falls below the response value, the protective function is reset.
3.4.2.2 Frequency increase protection f>, f>>
Menu: 3. Settings-> 3. Frequency ->:
1. f>> and 2. t
(OFF)
3. f> and 4. t
(OFF)
In the case of frequency increase protection, the measured value is compared to the re-
sponse value (f>> or f>). If the measured value exceeds the response value for the du-
ration of the corresponding response delay (t(OFF)), the protective function is tripped.
If the measured value falls below the response value, the protective function is reset.

Functional description
17
VMD460-NA_D00001_05_M_XXEN/01.2020
3.4.3 Islanding detection df/dt (ROCOF), vector shift detection
The VMD460-NA uses a passive method for islanding detection. The following methods
are available:
•Three-phase voltage monitoring, refer to voltage protection functions
•Rate of Change of Frequency (ROCOF) df/dt
•Vector shift detection
3.4.3.1 Islanding detection
Rate of Change of Frequency (ROCOF) df/dt
Menu: 3. Settings -> 4. df/dt ->:
1. Function
2. Response value
3. Hysteresis
4. Meas. window
5. t
(OFF)
6. t
(ON)
In the case of the ROCOF method, the df/dt measured value (Rate Of Change Of Fre-
quency) is compared to the response value. If the measured value exceeds the response
value for the duration of the corresponding response delay (t(OFF)), the protective func-
tion is tripped.
If the df/dt measured value falls below the response value by the hysteresis, the protec-
tive function is reset.
The df/dt detection can be enabled or disabled via the "
Function " parameter.
The interval for averaging of the df/dt measured values is set via the "
Meas. window " pa-
rameter.
The parameter "
t(ON) " can be used to set a separate reconnection delay after a df/dt
disconnection, see also ... .
3.4.3.2 Vector shift detection
Menu: 3. Settings-> 5. Vect.shift ->:
1. Function
2. Response value
3. t
(START-UP)
4. t
(ON)
Particularities of VDE-AR-N 4105:2018-11
(4105_2; profiles 1 and 2)
If it has been detected that dynamic network support is required, is-
landing detection is disabled for 8 seconds, suppressing unwanted dis-
connection from the network.

Functional description
18 VMD460-NA_D00001_05_M_XXEN/01.2020
The vector shift detection detects phase displacements (vector shift) in the network
voltage.
if the ° measured value exceeds the response value, the protective function is tripped.
After successful connection, the vector shift detection is blocked or suppressed for the
duration of the delay time t(START-UP), so that transient phenomena caused by connec-
tion do not trip the protective function.
The function can be set to "off" via the "
Function " parameter or the behaviour of the
vector shift detection can be set:
•"L1", "L2", "L3": The protective function monitors the set phase
•"single": The protective function monitors each phase separately (OR operation)
•"all": A vector shift must occur simultaneously on all (three) phases
The " t(ON) " parameter can be used to set a separate reconnection delay after a vector
shift disconnection.
3.4.4 Unbalance detection
Menu: 3. Settings-> 5. Unbalance:
1. Function
2. Response value
3. Hysteresis
4. t
(OFF)
On one hand, the unbalance is determined separately on the basis of the phase voltag-
es among each other and on the other hand, on the basis of the line-to-line voltages
among each other. If the unbalance measured value exceeds the set response value for
the duration of the delay time (t(OFF)), the protective function is tripped.
If the unbalance measured value falls below the response value by the hysteresis, the
protective function is reset. The unbalance detection can be enabled or disabled via the
"
Function " parameter.
3.4.5 Monitoring of the tripping circuits and interface switches by means of
contact feedback
Menu: 3. Settings-> 8. Dig.in.:
1. Mode
2. t
(START-UP)
3. Fault memory
The digital contacts D1 and D2 can be used to monitor the tripping circuits
(K1 -> interface switch 1 -> D1 and K2 -> interface switch 2 -> D2).
If "1AC" is set as coupling, "L1" is automatically monitored, even
though the "Function" parameter still displays the last value set.

Functional description
19
VMD460-NA_D00001_05_M_XXEN/01.2020
The VMD460-NA monitors and compares the contact positions of K1 and D1 as well as
K2 and D2, and deduces faults in the tripping circuits.
If the VMD460-NA is connected, it checks the contact positions after the time delay
(t(START-UP)) has elapsed. Increasing the value may be necessary, e.g. for slow motor-op-
erated interface switches.
If the VMD460-NA has disconnected, it checks the contact positions after 500 ms.
The "
Mode " parameter is used to define the operating mode ("NO" or "NC") of the digital
contacts or to disable the function ("off").
The "t
(START-UP)
" parameter defines a time delay after which the contact position is
checked subsequent to connection.
The "
Fault memory " parameter can be used to define the disconnection behaviour in
the event of a detected fault in the tripping circuits. If the fault memory is "enabled", the
VMD460-NA does not perform an automatic (re-)connection or any connection at-
tempts. To reconnect, the fault in the tripping circuit (interface switch fault) must be
manually acknowledged and reset via the RESET button.
3.4.6 Remote trip: remote disconnection via ripple-control receiver
Menu: 3. Settings-> 1. General ->:
8. Remote trip
A remote trip signal can be connected to the RTG1 and RTG contacts for remote discon-
nection, e.g. via a ripple-control receiver.
If a remote trip signal is applied to the RTG1 and RTG contacts, the VMD460-NA trips re-
lay K1 (and if necessary K2) after ≤ 50 ms and the alarm LEDs light up.
3.4.7 Test function for checking the tripping circuit, the interface switch and
for determining the connection times
The self test is started by pressing the test button. It can only be started manually when
the VMD460-NA has been connected (both alarm LEDs off).
The VMD460-NA disconnects during the self test. When interface switch monitoring/
contact feedback is enabled and connected, the disconnection time is measured and
displayed.
Particularities of VDE-AR-N 4105:2018-11 (4105_2)
First, disconnection path 2 is disconnected via K2. 5 s later, disconnec-
tion path 1 is disconnected via K1. The test takes approx. 10 s.
When interface switch monitoring/contact feedback is enabled and
connected, the disconnection time is measured and displayed for each
of the two relays. This ensures that the second disconnection path can
also be tested.

Functional description
20 VMD460-NA_D00001_05_M_XXEN/01.2020
3.4.8 Automatic self test
The device runs a continuous self test during which internal malfunctions are detected
and shown on the display as error codes. As soon as the VMD460-NA detects an internal
malfunction, it issues a disconnection command.
3.5 Other functions
3.5.1 Password protection
Menu: 4. System -> :
4. Password
The password protection is disabled by default. If no password is set, all parameters and
device settings can be freely changed and configured.
It is possible to navigate through the menu even if the password protection is enabled.
The following parameters can always be changed (without entering a password): Histo-
ry, Language, TEST and RESET.
To change parameters, a password is required. A password remains active until exiting
the menu. After 5 minutes of inactivity, the menu is exited automatically.
3.5.1.1 Single-stage password protection (system password)
The single-stage password protection is always available. After entering the correct
"System" password, all parameters can be changed.