Siemens 3AH Installation Operation & Maintenance - Page 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.
Manual Operation
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
Manual Closing (Figure 6a)
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" .
Manual Opening (Figure 6a)
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).
50
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