Bender VMD460-NA - Remote Trip: Remote Disconnection Via Ripple-Control Receiver; Test Function for Checking the Tripping Circuit, the Interface Switch and for Determining the Connection Times

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.