12
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!
Number of crank turns
Panel type
12/17.5 kV
24 kV
ZS1, UniSafe,
UniGear
type ZS1,
20
30
Powerbloc and
Mounting frame
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 -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!
6.3.2
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 -Y0 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.
6.3.3
Motor-driven movement of the withdrawable part
• Briefly operate the electrical control for insertion
or withdrawal (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.
Emergency manual operation:
Emergency manual operation is carried out with the
hand crank 38 on the spindle mechanism 35.1, 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 38 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 behaviour of the permanent magnet
motor could be irreversibly impaired.
6.3.4
Withdrawal from the test/disconnected position
onto the service truck
(Figures 9/24 and 9/25)
• 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.
6.3.5
Insertion from the service truck into the test/
disconnected position
• Carry out the procedure as described above for
withdrawal, changing the order accordingly.
