ABB VD4 Instruction Manual page 12

Note:
In order to avoid damage to the operating mecha-
nism, use the original hand crank only.
• Standard version without slip clutch
• Optional version with slip clutch
• Move the withdrawable breaker part (13) into the
service position with 20 clockwise turns of the
crank (for Unigear type ZS1 panels).
Note:
Do not force to move the withdrawable breaker
part (max. torque 25 Nm)!
Comply with the conditions for movement of the
withdrawable part as set out in section 5.5.6!
• Observe the position indicator.
• Remove hand crank (121) by pressing first against
the hand crank and then remove.
When removing the crank, it is essential to ensure
that the spring-loaded scene head 18.2 slides
into the untensioned front position. Spindle 18 is
thus locked in place, preventing inadvertent tur-
ning of the spindle. Turning of the spindle opens
auxiliary switches -S8/-S9 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/disconnected position!
Manual withdrawal from the service position into
the test/disconnected position:
• Ensure that the circuit-breaker is in the OFF po-
sition.
• Reverse the procedure described above for in-
sertion into the service position.
Note:
Withdrawable parts with blocking magnet -Y0 may
not be forcibly moved during power failures. In such
a case they are blocked in the service and test po-
sitions. For deblocking, see section 5.5.5.
Motor-driven movement of the withdrawable part:
• Briefly operate the electrical control for insertion
or withdrawal (the withdrawable part then auto-
matically moves into the opposite position).
• Observe the position indicator.
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.
12 13
Emergency manual operation is carried out with the
hand crank (121) on the spindle mechanism (18),
in a similar manner to operation of a withdrawable
breaker part with manual systems:
• Turn off the supply voltage (m.c.b.), since the
motor would otherwise be braked electrically.
• Turn hand crank (121) in the required direction.
When the withdrawable part moves, the motor
turns. The motor functions in such a case like a
generator, i.e. it can lead to reverse voltages in the
terminals.
The motor protection device must not be changed
from the specified type and rated value, or the be-
haviour of the permanent magnet motor could be
irreversibly impaired
Caution:
On emergency manual operation of a motor-ope-
rated withdrawable breaker part:
• When a motor-operated earthing switch is fitted,
the mechanical interlock with the earthing switch
may not be available unless specially ordered.
• When a manual earthing switch is fitted, the
mechanical interlock is always effective.
Withdrawal from the test/disconnected position
onto the service truck:
• Open the door of the circuit-breaker com p art-
ment.
• Release control wiring plug (10.2) and engage it
in the storage position on the withdrawable part.
• Position service truck (124) with the guide pins
(124.2) of the adjustable bench top at the correct
height facing the panel front, and allow catch
(124.3) to engage.
• Move sliding handles (13.11) inwards against
the springs to release withdrawable part (13),
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.
Insertion from the service truck into the test/dis-
connected position:
• Carry out the procedure as described above for
withdrawal, changing the order accordingly.