98
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7. Operation of the switchgear
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 applied to the insertion /
withdrawing lever is 260 N. In any case, the
maximum applied 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 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 in the
same way as described above for manual
operation.
• Open the circuit-breaker compartment door.
If doors are interlocked, loosen (but do not
dismantle) 2 lock screws M6 (Figure 80) on
the lateral side of the door - this releases the
blocking stop and it is possible to open the
door.
• Remove the disk with the yellow sticker
(Figure 162) by unscrewing the screw
• For older switchgear version without the disk
with the yellow sticker (Figure 162) switch off
the auxiliary power (m.c.b.), since the motor
would otherwise be braked electrically and
manual operation would not be possible
• Close the door
• Fit hand crank (Figure 160) on square spigot
of the spindle mechanism after opening the
aperture for them by turning slide (Figure
159)
• Turn the crank clockwise (to service position)
/ anticlockwise (to test position) until the
stop is reached and the withdrawable part is
in the end position
• Observe the position indicator
• Remove hand crank
• Open the door
• Install the disk with the yellow sticker (Figure
162) back
• Set up the blocking stop so that its lower
edge is in the range of 29.8-30.3 mm above
the level of the lower edge of the slot in the
door draw bar when the door handle is in the
closed position (Figure 85) (Figure 86). The
required position of the stop can be set up by
insertion of the jig OCA0071, drw.No.
1VL7611226P0101.
• Close the door
In some product versions, 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 damaged!
Caution:
Manual operation of a motorized withdrawable
circuit-breaker part should be performed in
emergency case only, as the interlocks with the
earthing switch and circuit-breaker door are not
effective!
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