102
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7. Operation of the switchgear
Circuit-breaker - type VM1
The maintenance-free VM1 circuit-breaker applies
a combination of moulded-in vacuum
interrupters, a magnetic actuator and an
electronic controller without auxiliary switches
and with sensors. Before connecting the primary
voltage:
• Connect the auxiliary voltage. OFF command
(closed – circuit release) and the closing lock-
out must be energized before the circuit-
breaker can be closed. The auxiliary voltage
has been established when the (Ready) LED 5
(Figure 167) lights up.
• Carry out the closing and opening test of the
circuit-breaker by pressing pushbuttons 6
and 7 (Figure 167).
• Closing: By remote control via closing
contacts or locally by pressing ON
pushbutton 6.
• Opening: By remote control via closing
contacts or locally by pressing OFF push
button 7.
• Opening on failure of the auxiliary power
supply: Electrical opening is still possible
within the first 200 s. After a period of 200 s,
emergency manual opening is necessary to
insert emergency manual operating lever 1
(Figure 168) onto the spigot of the
emergency shaft 3 (Figure 167) in the front
plate and turn it anticlockwise to open the
circuit-breaker. Just before the final stop is
reached, a slight resistance on the
emergency shaft has to be overcome.
• Closing on failure of the auxiliary power
supply: Closing is not possible.
• After each operating cycle (ON-OFF), the
operating cycle counter 1 (Figure 167)
increases by one full digit. On termination of
a switching operation, the position indicator
2 in the window of the front plate displays
the related switch position.
• Anti-pumping system: The circuit-breaker
controller ensures that circuit-breaker
closing is locked when an opening command
is active. When closing on a subsequent
opening command, further closing with the
closing command still active is locked. The
closing command must be given again for the
next closing operation.
For details, refer to manual.
Figure 167:
1 Mechanical operating cycle counter
2 Mechanical switch position indicator
3 Catch for emergency manual operating lever
4 Front cover plate
5 “Ready” display
6 ON pushbutton
7 OFF pushbutton
Figure 168:
1 Recess for emergency manual opening lever
2 Emergency manual opening lever
Emergency manual switch-offWithdrawable part with VM1 type
circuit-breaker - operating mechanism side
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