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The SACE PR122/DC and SACE PR123/DC releases allow for the number operations performed the circuit-breaker service be
displayed all times the special display.
8. Open the door the disconnected position.
During normal service, the circuit-breakers require limited maintenance.1 g
Before carrying out any maintenance work, necessary complete the following procedure:
- open the circuit-breaker and check that the operating mechanism springs are unloaded
- the case withdrawable circuit-breakers, work with the circuit-breaker racked-out the fixed part
- for action fixed version circuit-breakers fixed parts withdrawable circuit-breakers, disconnect the supply the power circuit and
to the auxiliary circuits.
On the basis the results obtained during the routine checks, establish the best time intervals for the maintenance operations. Furthermore, visibly earth the terminals both the power supply side and the load side.
Model L3447
A pparatus Emax DC
S cale
D oc-N 1SDH000635R0002
Page No. 31
d) Passing from the CONNECTED position, the TEST ISOLATED position, the DISCONNECTED position
Repeat the connection procedures changing the direction for turning the crank handle anti-clockwise.
Fig.
Remove the crank handle enable the circuit-breaker close.
Lower the releasing lever (11).
Proceed turn the crank handle clockwise until the CONNECTED indication appears the indicator (9).
Proceed turn the crank handle clockwise until the TEST ISOLATED indication appears the indicator (9).
Insert the crank handle the corresponding coupling (10).
Fig. particular,
with regard the time intervals, advisable follow the recommendations the table, least for the first year service.
Lower the releasing lever (11). 30
c) Passing from the TEST ISOLATED position the CONNECTED position
Make sure that the circuit-breaker open.
For the connection procedure, make sure that the key (12) the correct position and/or the padlock (14), any, has been removed.
Make sure that the circuit-breaker open.
18/108
.
It also advisable refer the following rules:
- circuit-breakers which rarely operate, which remain closed for long periods, must operated from time time avoid any tendency to
stick
- during service, routinely inspect the circuit-breaker from the outside check for any dust, dirt damage any kind.Passing from the DISCONNECTED the TEST ISOLATED position
Make sure that the indicator (9) the DISCONNECTED position.
The table the maintenance program given the following paragraph, indicating the corresponding periodic intervals for action.
Insert the crank handle the corresponding coupling (10). Maintenance
8.
Should necessary carry out offline circuit-breaker operations, the crank handle must removed.
Push the moving part right into the fixed part.
For circuit-breakers with SACE PR122/DC and SACE PR123/DC releases, check the percentage wear the contacts. During the initial turns, the crank
handle must oppose any particular resistance rotation
