Instruction manual 534/01 | VD4 Vacuum-circuit-breaker 29
Circuit-breakers with manual charging mechanisms:
- Insert charging lever 19 into recess 15 and pump up and
down for approx. 25 strokes until the charged condition is
displayed.
- When the charged condition is reached, the charging me-
chanism automatically disengag es, and further strokes of
the charging lever have no effect.
Key to the charging condition indications:
Discharged Charged
As a precondition for an autoreclosing sequence, the opera-
ting mechanism is either (re-)charged after a clos ing opera-
tion automatically by the charging motor, or it requires (re-)
charging by hand if the operating mechanism is of the manual
type.
7.4.2 Closing and opening the circuit-breaker
With the withdrawable part in the service position, on and
off switching operations should only be carried out with the
doors closed.
- Closing operation:
Press mechanical ON push-button 11, or
operate the electrical control unit.
- Opening operation:
Press mechanical OFF push-button 12, or
operate the electrical control unit.
Observe the notes in section 4.3.1.
The operating cycle counter 14 is automatically incremen-
ted by one complete figure with each switching cycle. On
completion of a switching operation the position indicator
13 in the window of front plate 9.2 shows the appropriate
position of the circuit-breaker.
- Anti-pumping relay:
The anti-pumping relay -KN (wiring diagram in figure 2/15)
prevents repeated ON-OFF switching operations if, for
example, the breaker is tripped by a protection relay in re-
sponse to a primary side fault while a permanent electrical
closing command is simultaneously applied. The circuit-
breaker can then only be closed after the closing command
has been interrupted.
- Closing on failure of supply voltage:
- With standard equipment:
On failure of the control voltage, mechanical closing by
means of ON push-button 11 is possible at any time.
- With blocking magnet -RL1 fitted:
On failure of the control voltage, blocking magnet -RL1
mechanically locks the ON haflshaft and simultaneously
interrupts the circuit shunt release ON -MC via the corre-
sponding auxiliary switch -BL1.
Closing with the blocking magnet de-energised requires
manipulation of the circuit-breaker operating mechanism:
- Remove front plate 9.2.
- Take care to avoid rotating parts!
-
- Opening on failure of supply voltage:
On failure of the supply voltage, mechanical opening by
means of OFF push-button 12 is possible at any time.
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