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Proceed turn the crank handle clockwise until the TEST ISOLATED indication appears the indicator (9).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.
b) Passing from the DISCONNECTED the TEST ISOLATED position
Fig. Open the door the disconnected position.
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.
For the connection procedure, make sure that the key (12) the correct position and/or the padlock (14), any, has been removed.
Proceed turn the crank handle clockwise until the CONNECTED indication appears the indicator (9).
Insert the crank handle the corresponding coupling (10).
Fig.
Remove the crank handle enable the circuit-breaker close.
Lower the releasing lever (11). ___________________________________________________________________________________________________________________________
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.
During normal service, the circuit-breakers require limited maintenance.
The SACE PR122 and SACE PR123 releases allow for the number operations performed the circuit-breaker service displayed
at all times the special display.Make sure that the indicator (9) the DISCONNECTED position. During the initial turns, the crank
handle must oppose any particular resistance rotation. Maintenance
8.
Model 2234 Apparatus Scale
L 2778
Doc-No' 1SDH000460R0002
Page No.
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.
- For circuit-breakers fitted with SACE PR121 releases, installation the mechanical operation counter (supplied request) recommended.
The table the maintenance program given the following paragraph, indicating the corresponding periodic intervals for action.
Push the moving part right into the fixed part.
Should necessary carry out offline circuit-breaker operations, the crank handle must removed.
Make sure that the circuit-breaker open.
Insert the crank handle the corresponding coupling (10). particular,
with regard the time intervals, advisable follow the recommendations the table, least for the first year service. ___________________________________________________________________________________________
c) Passing from the TEST ISOLATED position the CONNECTED position
Make sure that the circuit-breaker open. Furthermore, visibly earth the terminals both the power supply side and the load side.
Lower the releasing lever (11).
For circuit-breakers with SACE PR122 and SACE PR123 releases, check the percentage wear the contacts.
8.
On the basis the results obtained during the routine checks, establish the best time intervals for the maintenance operations
