71
Note
The withdrawable part must not be stopped in any intermediate position in the travel range between
the service and test/disconnected position!
Manual withdrawal from the service position into the test/disconnected position
• Ensure that the apparatus is in the OFF position;
• Reverse the procedure described above for insertion into the service position.
Important note
Insertion and withdrawal of circuit-breakers (and other withdrawable parts) must be gradual, in order
to avoid any shocks which could deform the mechanical interlock. If the operations are prevented, do
not force the interlocks and check that the operating sequence is correct.
The force normally applicable to the insertion/withdrawing lever is 260 N. In any case, the maximum
applicable force must never exceed 400 N.
Please also refer to the technical documentation of the circuit-breakers for installation operations.
Caution: the insertion and withdrawal must always be carried out with the apparatus open!
Do not use force to move withdrawable parts with locking magnet Y0 or RL2 in the event of an auxiliary
voltage drop. If this occurs, they are locked along the whole travel range between the service and test
positions.
To remove the interlock, consult the technical documentation of the circuit-breakers.
Motorized 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.
Note
When the drive motor is faulty, the withdrawable part can be moved using the emergency manual
operation.
If the drive motor fails during movement of the withdrawable part, the withdrawable part must be moved
into a limit position using emergency manual operation.
Emergency manual operation is carried out with hand crank 121 (figure 113) on spindle mechanism
18, in a similar way to operation of a withdrawable circuit-breaker part with manual systems. To
disengage the motorized withdrawable part, consult section 7.5.1.
• Switch off the auxiliary power (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. In this case, the motor functions like a generator,
i.e. it can lead to reserve voltages in the terminals.
The motor fuse must not be changed from the specified type and rated value, otherwise the behaviour
of the permanent magnet motor could be irreversibly impaired!
Caution
In emergency manual operation of a motorized withdrawable circuit-breaker part, the interlock with the
earthing switch is not effective!
Withdrawal from the test/disconnected position onto the service truck
• Open the door of the circuit-breaker compartment;
• Release control wiring plug 10.2 (figure 111) and place it in the storage position on the withdrawable
part;
• Position service truck 124 (figure 114) with guide pins 124.2 (figure 116) 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 (figure 114) inwards against the springs to release withdrawable part
13, draw the withdrawable part out onto the service truck and secure it in the catches on the truck;
• Press release lever 124.4 (at the front underneath the bench top) and release the service truck from
the switchgear panel;
• Secure the position of the shutters with padlock 130 (figure 117).
Insertion from the service truck into the test/disconnected position
• Carry out the procedure described above for withdrawal in reverse order.
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