Earthing; Movement Of The Withdrawable Breaker Part; Manual Insertion From The Test/Disconnected Position To The Service Position; Manual Withdrawal From The Service Position Into The Test/Disconnected Position - ABB VM1 Instruction Manual

- If no voltage is applied to input -RL1, closing is impossible.
- If no voltage is applied to input -MU
in case of activated -MU
port (Figure 9/16a).
- Check mechanical and electrical interlocks for effective-
ness, without using force.
- Perform test closing and opening of the circuit-breaker by
pressing push-buttons 3 and 4 (see Figure 9/17).
- On motor-driven withdrawable parts, check the direction of
rotation of the travel motors as described in section 7.5.3.
- For any further questions on the functions of the withdraw-
able circuit-breaker part and its testing, see section 7.5.
- Instruct the local operators in the fundamental details of
regular handling of the switchgear.
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 withdraw-
able part as set out in section 7.5.4!
Full version on the control module, optional
3)
, closing is impossible
3)
and not activated closing sup-
3)
Panel type
ZS1, UniSafe, UniGear type ZS1,
Powerbloc and Mounting frame
ZS8.4 without tee-off partitioning
ZS8.4 with tee-off partitioning
- 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 in-
advertent turning of the spindle. Turning of the spindle opens
auxiliary switches -BT2/-BT1 and thus prevents the circuit-
breaker from being operated.
Note:
The withdrawable part must not be stopped at any position in
the travel range between the service position and test/discon-
nected 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

Motor-driven movement of the withdrawable part

- Briefly operate the electrical control for insertion or with-
drawal (the withdrawable part then automatically moves
into the opposite position).
- Observe the position indicator in the front door.
Note:
When the motor fails, the withdrawable part can be moved in
emergency manual operation. If the drive motor fails during
movement of the withdrawable part, the withdrawable part
must be moved into a limit position in emergency manual
operation.
Instruction manual 504/05 | VM1 Vacuum circuit-breaker 13
Number of crank turns
12 / 17.5 kV 24 kV
20 30
20 25
25 25