Siemens 3AH Installazione Funzionamento e manutenzione - Pagina 17

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Vacuum Interrupter/Operator Description

Figure 9a. Use of Manual Spring Charging Crank

Rapid Auto-Reclosing

Since the closing spring is automatically recharged by the

motor operating mechanism when the circuit breaker has

closed the operating mechanism is capable of an open-

close-open duty cycle as required for rapid auto-reclosing.

Electrically operated vacuum circuit breakers can be oper-

ated manually if the control supply should fail.

The circuit breaker may be operated only with the original

hand crank (50), in order to avoid injures as a result of the mo-

tor suddenly starting up.

Manually Charging the Closing Spring

(Figures 9a and 9b).

Insert the hand crank (50) with the over running coupling

pushed forward (50.6) through the opening (50.1) onto hand

crank coupling (50.5) and turn it clockwise (about 48 revolu-

tions) until the closing spring indicator (55) shows "Charged" .

The hand crank is coupled with the charging mechanism via

an over-running coupling; thus the operator is not exposed

to any risk should the control supply recover during charg-

ing.

50.5

50.6

Figure 9b. Use of Manual Spring Charging Crank

Press the close button (53). The close-open indicator (58)

will then display "Closed" and the closing spring condition

indicator (55) will now read "Discharged" .

The opening spring (64) is charged during closing. To open

the circuit breaker, press the Open pushbutton (54) and

"OPEN" will be displayed by indicator (58).