L2275
Emax UL
17/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
Fig. 30
Fig. 31
12
14
10
9
11
10
9
11
b) Passing from the DISCONNECTED position to the TEST ISOLATED position.
Make sure that the indicator (9) is in the DISCONNECTED position.
For the connection operation, make sure that the key (12) is in the correct position and/or the padlock (14) has been removed (if present).
Make sure that the power circuit breaker is open.
Fully push the moving part into the cradle.
Lower the releasing lever (11).
Insert the crank handle in the relative coupling (10).
Proceed to rotate the crank handle clockwise until the TEST ISOLATED indication appears on the indicator (9). During the initial turns, the crank
handle must not show any particular resistance to rotation.
Should it be necessary to carry out blank operations of the power circuit breaker, the crank handle must be removed.
c ) Passing from the TEST ISOLATED position to the CONNECTED position
Make sure that the power circuit breaker is open.
Lower the releasing lever (11).
Insert the crank handle in the relative coupling (10).
Proceed to rotate the crank handle clockwise until the CONNECTED indication appears on the indicator (9).
Remove the crank handle to be able to close the power circuit breaker.
d) Passing from the CONNECTED position, to the TEST ISOLATED position, to the DISCONNECTED position.
Repeat the connection operations with the variation of rotating the crank handle anticlockwise. Open the door in the disconnected position.
8.
Maintenance
8.1
Warnings
Before carrying out any maintenance work, it is necessary to complete the following procedure:
– open the power circuit breaker and check that the operating mechanism springs are discharged.
– in the case of draw out power circuit breakers, work with the power circuit breaker racked-out of the cradle
– for interventions on fixed version power circuit breakers or on cradles of draw out power circuit breakers, remove the supply to the power circuit
and to the auxiliary circuits. Furthermore, visibly ground the terminals both on the power supply side and on the load side.
During normal service, the power circuit breakers require limited maintenance.
The table of the maintenance program is given in the following paragraph, indicating the relative periodic intervals for intervention. In particular,
with regard to the time intervals, it is advisable to follow what is specified in the table, at least for the first year of service.
On the basis of the results obtained during the periodic checks, establish the best time intervals for the maintenance operations.
It is also advisable to refer to the following rules:
– power circuit breakers which rarely operate, or which in any case remain closed for long periods, must be operated from time to time to avoid
any tendency to stick.
– during service, visually inspect the power circuit breaker from the outside to find any dust, dirt or damage of any kind.
For power circuit breakers with SACE PR112-A and SACE PR113-A trip units, check the percentage of wear of the contacts.
– For the power circuit breakers fitted with SACE PR111-A trip units, installation of the mechanical operation counter (supplied on request) is
recommended. The SACE PR112-A and SACE PR113-A trip unit allows the number of operations carried out by the power circuit breaker in
service to be displayed at all times on the special display. This latter trip unit also makes various useful pieces of information available for controlling
the status of the power circuit breaker.
