DISCONNECTING SWITCH
Operation & Maintenance Manual
09
4.3 - Check Points for Maintenance & Inspection
Externals
Operating
Mechanism
Appearance (rust, dewpoint)
Control
Circuit
Inspection
Visual
Ordinary
Detailed
Gas pressure
Open - close indicator
Abnormal noise and smell
Filings and chips, dislocated
parts, foreign matters
Deformation, damage, wear
Loose bolts and nuts
Visual check
Movement of operating spring
Movement of link
Greasing state in sliding and
rotating parts
Warping or galling of parts
Oiling (machine oil) state in
sliding and rotating parts
Remove old grease and apply
new grease
Lubrication
and
operation
Oiling and
greasing
Check for dislocated
connectors and pins and for
deformation and breaks
Check for loose fastenings of
the switch terminals and for rust
Contact state of auxiliary switches
Visual check
Check on
Mechanical
parts
Contact state of limit switches
Device operation test
(measurement taken during
motor operation)
Sequence test (interlock
operation)
Test
Category
Check point
Table 4.3 - Check Points
