ABB VM1 Installation And Service Instructions Manual page 37

M E D I U M V O LTA G E P R O D U C T S
8.5.3. Transmitted contacts in the truck (-BT1;
-BT2)
Transmitted contacts of the withdrawable
circuit breaker (installed in the circuit breaker
truck - only for withdrawable circuit breaker for
UniGear ZS1 switchgear and for PowerCube
enclosure).
These contacts are either in addition or as an
alternative to the position contacts (for
signalling circuit breaker racked-out) located in
the unit. They also carry out the function of the
position contact (-BT3).
8.5.4. Position contact (-BT3)
The position contact (-BT3) is used, together
with binary input SL1, to prevent remote circuit
breaker closing during traverse into the unit. It
is only supplied for the withdrawable version
circuit breaker when the transmitted contacts
in the truck are not requested (-BT1; -BT2).
8.5.5. Motorised truck (-MT) (only for
withdrawable version circuit breaker for
UniGear switchgear)
This allows the circuit breaker to be racked-in/out
of the switchgear remotely.
Characteristics
Un:
Operating limits:
Rated power (Pn):
8.5.6. Device for rapidly discharging the
capacitor/s
Before accessing the circuits present in the
control box, it is compulsory to make sure that the
capacitor/s is/are discharged.
Even when there is no auxiliary power supply,
more than ten minutes are needed to completely
discharge the capacitor/s.
The rapid discharing device allows the waiting
time to be reduced to one minute and guarantees
safe access to the circuits which might be live.
37 37
110 - 220 V–
85 ... 110% Un
40 W