120
Withdrawable parts with order-related locking
magnet may not be moved in case of control
power failure, or when there is no control power.
Do not forcibly move locked withdrawable parts!
The locking magnet is only present on manually
operated withdrawable parts. Releasing the
locking magnet:
• Remove front plate.
• Disengage locking magnet by pulling the
magnet armature.
• While doing so, turn crank (Figure 207) about
one half turn (either direction of rotation is
permissible). The locking magnet is only
active in the test position and service
position. In intermediate positions it has no
effect.
Disconnection of the control wiring plug as well
as later insertion must be locked in the
withdrawable part service position. Check this
condition.
Operation of the earthing switch must only be
possible when withdrawable part is in the test /
disconnected position or the removed position
(subject to any additional electro-magnetic
interlocks in individual cases).
Check this condition:
• With the withdrawable part in the test /
disconnected position, it must be possible to
press slide, in front of the earthing switch
operating shaft 1, downwards to the opening
position. The earthing switch can then be
operated.
• With the slide pressed down, it must also be
impossible to start the travel motor on
motor-driven withdrawable parts.
• If the slide is pressed down slightly when the
travel motor is running, the motor must then
automatically switch off immediately. The
selected travel direction is continued by
pressing the button It is only possible to
press slide down fully with a running travel
motor when the latter is in the start-up
phase.
• When the withdrawable part is moved
inwards towards the service position,
pressing down of slide must be locked after
only one and a half clockwise turns on the
crank.
—
9. Maintenance
For switchgear equipped with Monitoring and
Diagnostics time interval for Inspection and
Servicing is 5 years.
For panels with Monitoring and Diagnostics
equipment:
• In busbar compartment, visually check that
temperature sensors at t-offs are in place,
not loose, without any sign of damage
• In cable compartment, visually check that
temperature sensors under lower spouts and
at cable connections are in place, not loose,
without any sign of damage. Check the
environmental sensor, if installed, allows free
air flow, not clogged by dust or other
material
• Envrionmental sensor on low-voltage
compartment door, if installed: Check the
probe tip is not damaged and allows free air
flow, not clogged by dust or other material
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