12 ABB Power Distribution
• Connecting and disconnecting of the control
wiring 10.2 is only possible in the test/
disconnected position of the withdrawable part.
• Switch-disconnector and the earthing switch
integrated therein are normally mechanically
interlocked from each other and in each case
only one of the two can be switched on.
• The earthing switch 6 can only be switched on if
the withdrawable part is in the test/disconnected
position or outside of the panel (mechanical
interlock
1)
).
• If the earthing switch is on, the withdrawable part
cannot be moved from the test/disconnected
position to the service position (mechanical
interlock).
• Details of other possible interlocks e.g. in
connection with a blocking magnet on the
withdrawable part and/or earthing switch drive,
can be obtained from the relevant order
documents.
3.4.2 Interlocks between panels
(Figure 3/1)
• The busbar earthing switch can only be on when
all withdrawable parts in the busbar section,
which must be earthed, are in the test/discon-
nected position (electromechanical
2)
interlock).
• When the busbar earthing switch is on, the
withdrawable part in the earthed busbar section
cannot be moved from the test/disconnected
position to the service position (electromecha-
nical
2)
interlock).
3.4.3 Locking devices
(Figures 3/7, 3/17, 3/18 and 6/16)
• The shutters 12.1 can be secured independently
of each other with padlocks when the
withdrawable circuit-breaker part has been
removed.
• Access to the drive-shaft of the earthing switch
can be restricted with a padlock.
• Access to the circuit-breaker compartment and
the cable compartment as well as to the
withdrawable part controls can be restricted
with a padlock.
3.5 VD4 circuit-breaker run on-block
In case of any irregularity in the area of the inner
control mechanism and of the charging function of
the stored-energy spring mechanism, the run-on
block disables the immediately subsequent
switching operation.
This is a protective measure to prevent damage to
the circuit-breaker.
Release of the run-on block is described in
instruction manual BA 383/E.
________________________
1)
The mechanical interlock is replaced by a blocking magnet in
the case of a duplex configuration.
In the case of a motor drive, the mechanical interlock or the
blocking magnet is replaced by electrical interlock of the
earthing switch. The emergency manual switch is not
locked!
2)
The blocking magnet is not installed in the case of a motor
drive; busbar earthing switches or the withdrawable parts
are electrically locked. The emergency manual switch is not
locked!
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