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Perform visual inspection and carry out the necessary maintenance work according to the
problems determined.
When an earthing switch has performed two short-circuit making operations, maintenance
work has to be done by means of a visual inspection of the earthing switch blades and the
fixed laminated contacts. If there is any visible erosion, the stressed components must be
replaced. To do this, please contact the regional Siemens representative.
Built-in equipment such as circuit-breakers, voltage transformers, current transformers,
relays, meters, protection equipment, etc. must be serviced and maintained as specified in
the associated operating instructions.
Carry out maintenance and servicing at shorter intervals (at the operator's discretion) if there
is a lot of dust, or if the air is extremely humid and/or polluted.
Following the results of the visual inspection, grease the following:
Guide rails and shutter guiding linkage
Fixed contacts of the earthing switch
Fixed contacts of the bushings
Apply WD-40 waterproof spray oil to a cleaning cloth, and clean the shutter guiding linkage
therewith.
Independently of the regular visual inspection and preventive maintenance, immediately
determine the cause of failures and short circuits, and document it completely.
Read the protection relays (optional) immediately after the fault, and evaluate the
information.
Add fault records and pictures to the documentation.
At the panel concerned, check the switching device and the compartments for damages. If
damage is determined, inform the Siemens representative and submit the documentation of
the fault.
Remove foreign objects, e.g. cleaning material.
Check the area directly around the panel and clean, if required.
139-2021.9 / 07
NXAIR M
Service information
243
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