ABB VM1 User Manual

10 VM1 Vacuum circuit-breaker | Instruction manual 504/05
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/
disconnected 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 posi-
tion (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 con-
nection 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 inter-
rupted 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 with-
drawable 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 re-
ceived by -RL1 after the first half revolution of spindle system
35.1, and it may only be re-applied after the last half revolu-
tion. 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 imple-
mented 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 move-
ment 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.
BA 504-05 GB_29102012.indd 10 30.10.12 13:44

ABB VM1 Specifications

General

Brand	ABB
Model	VM1
Category	Circuit breakers
Language	English