119
Activity
See section Time interval in years According to number of switching operations
Inspection
9.3 4
(1)
As required
(3)
Servicing 9.4 4
(2)
As required
(3)
Repair 9.5 As required As required
• After removal of the bulkhead from the
circuit-breaker compartment, the main
busbars are visible.
• Visually check that the top monoblocks 4
(Figure 192), where the tulip isolating contact
is housed, are fully intact and do not show
any sign of damage.
• Visually check that the insulating covering of
the main busbars and the insulating joining
cover of the busbars are fully intact and do
not show any sign of damage.
Cleaning and checking the auxiliary connections
• Open the miniature circuit-breakers 1 (Figure
189) positioned inside the low voltage
compartment to remove the auxiliary power
supply to the panel
• Carry out a visual inspection on all the
cabling, terminal boxes 2 and check for any
presence of dirt
• Manually check correct insertion of the
cabling in the terminal box
Testing interlock conditions
Carry out a visual inspection of the mechanical
parts of the interlocks (key locks 1 , door
interlocks 1 , fail safe 2) and check for any
presence of humidity and signs of corrosion on
the moving parts.
The withdrawable part must only be movable
from the test / disconnected position into the
service position when the circuit-breaker is open
and the earthing switch is open. Check the
following conditions individually:
• With the circuit-breaker closed, insertion of
the withdrawable part towards the service
position must be locked after only half a turn
of the crank in the clockwise direction, and it
must not be possible to switch on the travel
motor on motor-operated withdrawable
parts.
• With the earthing switch closed, insertion of
the withdrawable part towards the service
position must be locked after only two
clockwise turns of the crank, and it must not
be possible to switch on the travel motor on
motor-operated parts.
Use no force! Also see the note in "7.1 Switching
operations"!
The withdrawable part must only be movable
from the service position into the test /
disconnected position with the circuit-breaker
open.
Check this condition as follows:
• With the circuit-breaker closed, withdrawal
movement of the withdrawable part must be
locked after only half a turn of the crank in
anti-clockwise direction, and it must not be
possible to switch on the travel motor on
motor-operated withdrawable parts.
Closing of the circuit-breaker must only be
possible when the withdrawable part is in the
defined test / disconnected position or service
position. The control wiring plug must previously
have been inserted.
Check this condition as follows:
• It must not be possible to close the circuit-
breaker with the withdrawable part in any
position between the test / disconnected
position and the service position. Enabling of
switching when the withdrawable part moves
into the service position is carried out
electrically by operation of auxiliary switch in
the withdrawable assembly, and slightly
earlier mechanically - this corresponds to a
position approximately half a turn of the
crank before the stop.
• For movement into the test / disconnected
position, the same enabling conditions apply
in the same way, in this case by means of
auxiliary switch in the withdrawable
assembly.
It must only be possible to open the circuit-
breaker (manually) when the withdrawable part is
in the service position or test / disconnected
position and the control voltage has failed. Check
this condition.
—
9. Maintenance
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