ABB VM1, Manual, Page: 13 / 52

M ED I U M VO LTAG E P R O D U C T S 13 13
6.3 Earthing
For the fixed version circuit breaker, carry out
earthing by means of the special screw marked
with the relative symbol.
Clean and degrease the area around the screw to a
diameter of about 30 mm and, on completion of
assembly, cover the joint again with vaseline
grease. Use a conductor (busbar or braid) with a
cross-section conforming to the Standards in
force.
6.4 Movement of the
withdrawable breaker part
(Figures 9/10, 9/17 and 9/21 to
9/23)
Perform switching operations with the front
doors shut.
6.4.1 Manual insertion from the test/
disconnected position to the service
position
• Connect control wiring plug 36.1.
• Close the front door.
• Ensure that the circuit breaker is in the OFF
position.
• Fit hand crank 38 on square spigot 35.2 of the
spindle mechanism 35.1.
Note:
In order to avoid damage to the operating mechanism, use the original
hand crank only.
- Standard version without slip clutch
- Optional version with slip clutch
• Turn the crank clockwise according the table until
the stop is reached and the withdrawable part 31
is in the service position.
Note:
Do not use force to move the withdrawable breaker part.
Maximum torque 25 Nm!
Comply with the conditions for movement of the
withdrawable part as set out in section 7.5.4!
Panel type
Number of crank turns
12 / 17.5 kV 24 kV
ZS1 , UniSafe, UniGear
type ZS1 ,Powerbloc
and Mounting frame
20 30
ZS8.4 without tee-off
partitioning
20 25
ZS8.4 with tee-off
partitioning
25 25
• Observe the position indicator in the front door.
• Remove hand crank 38 by first pressing slightly
against the hand crank and then remove.
Note:
When removing the crank, it is essential to ensure that the spring-loaded
guide 35.6 slides into the untensioned front position. Spindle 35.1 is thus
locked in place, preventing inadvertent turning of the spindle. Turning of
the spindle opens auxiliary switches -BT2/-BT1 and thus prevents the
circuitbreaker from being operated.
Note:
The withdrawable part must not be stopped at any position in the travel
range between the service position and test/disconnected position!
6.4.2 Manual withdrawal from the service
position into the test/disconnected
position
• Ensure that the circuit breaker is in the OFF
position.
• Reverse the procedure described above for
insertion into the service position.
Note:
Withdrawable parts with blocking magnet -RL2 may not be forcibly moved
during power failures. In such a case they are blocked in the service and
test positions. For deblocking, see section 7.5.4.
6.4.3 Withdrawal from the test/disconnected
position onto the service truck (Figures
9/22 and 9/23)
• Open the door of the circuit breaker compartment.
• Pull out control wiring plug 36.1 and place it in the
receptacle provided.
• Position service truck 40 with the guide pins 40.2
of the adjustable bench top at the correct height
facing the panel front, and allow catch 40.3 to
engage.
• Move sliding handles 35.3 inwards against the
springs to release withdrawable part 31, withdraw
onto the service truck and secure it in the catches
on the truck.
• Press the release lever (at the front underneath the
bench top) and release the service truck from the
panel.
6.4.4 Insertion from the service truck into the
test/disconnected position
• Carry out the procedure as described above for
withdrawal, changing the order accordingly.