Interlocks; Interlocks/Protection Against; Interlocks Within Vm1 Withdrawable Parts; Interlocks When Using Non-Original Withdrawable Assemblies Are Used - ABB VM1 Manual

M E D I U M V O LTA G E P R O D U C T S

3.4. Interlocks

3.4.1

Interlocks/protection against

maloperation for C.B. on withdrawable
parts (Figure 9/8)
A series of interlocks are provided to prevent
dangerous situations and any maloperation. The
interlocks of the panel system ZS and/or the
Powerbloc/mounting frame, which are normally
effective, are as follows (concerning the circuit
breaker):
• The withdrawable part can only be moved from
the test/ 2disconnected position into the service
position (and back) with the circuit breaker open
(that means that the breaker must be opened
before).
• The circuit breaker can only be closed if the
withdrawable part is precisely in the defined test
position or service position (electrical interlock).
• The circuit breaker can only be opened manually in
the service or test position when no control
voltage is applied, and it can not be closed.
• The panel is equipped with devices which allow
the connection and disconnection of the control
wiring plug 36.1 only in the test/disconnected
position.
3.4.2

Interlocks within VM1 withdrawable parts

3.4.2.1 Interlocks when ABB withdrawable
assemblies are used (Figures 9/10, 9/27
and 10/10 to 10/13)
1. The VM1 can only be closed via input -MC when
a voltage of 24 V to 240 V AC/DC is applied to
input -RL1 (electrical closing lock-out).
2. The VM1 can only be closed when the with-
drawable assembly is in service or test
position. In the intermediate positions, the
voltage for the closing lock-out -RL1 is
interrupted by auxiliary switches -BT2/-BT1.
3. A mechanical interlock 35.5 and 41.2 prevents a
breaker that is not in the OFF position being
moved.
3.4.3 Interlocks when non-original withdrawable
assemblies are used (Figures 9/27, 10/3
and 10/15 to 10/19)
VM1 circuit breakers which are not mounted on
ABB withdrawable part must be electrically
interlocked with one or two additional auxiliary
switches. These must interrupt the input voltage
to the electrical closing lock-out (input -RL1).
In a similar manner to auxiliary switches -BT2 and
-BT1 on the ABB withdrawable part, no further
electrical pulse may be received by -RL1 after the
first half revolution of spindle system 35.1, and it
may only be re-applied after the last half
revolution. This ensures that the circuit breaker
cannot be closed when the withdrawable part is in
an intermediate position.
An interlock as described in 3.4.2.1 part 3, is to be
implemented to prevent a circuit breaker which is
not in the OFF condition from being moved. The
slide blocker 41.2 on the VM1 (optional accessory
for stationary mounted breakers) can be used for
this purpose: the slide blocker is outside base
plate 41.4. Figure 9/27 shows pawl 35.5 on the ABB
withdrawable part. With the circuit breaker not in
the OFF position, pawl 35.5 cannot be moved
upwards. This prevents movement of the
withdrawable assembly and therefore movement
of the circuit breaker.
Note:
Additionally fitted interlocks must not exert any force on the operating
mechanism of the circuit breaker.
As the interlock mechanism projects beyond the base of the circuit
breaker casing, measures must be taken to prevent the the circuit breaker
from weighing down on the interlock, for instance during transport.
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