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MAINTENANCE
Page 17
Table 2 - Check Points for Periodic Inspection
Check
Point
Check Item
Check Method
Criteria
Disposition
Operating
Mechanism
Loose bolts,
nuts or
screws
Tighten using
screwdriver or wrench.
Make sure all bolts,
nuts and screws are
tight.
Tighten if loose.
See (Table 1) for
tightening torque
specifications.
Dust or
foreign
matter inside
Visual inspection.
The contactor should
be clean and contain
no foreign matter.
Wipe with a clean
dry cloth.
Smooth
operation
Visual inspection or
touch. Check
lubrication.
Make sure moving
parts operate
smoothly.
Wipe with a clean
dry cloth. Lubricate if
necessary
Main Circuit
Terminals
and movable
conductors.
Visual inspection.
Tighten using
screwdriver or wrench.
Make sure there is no
discoloration or loose
fasteners.
Check the cause
and repair. Tighten
connections to
contactor. See
(Table 1 )for
tightening torque
specifications.
Loose bolts,
nuts or
screws
Tighten using a
wrench.
Make sure all bolts,
nuts and screws are
tight.
See (Table 1) for
tightening torque
specifications.
Vacuum
contact wear.
See Electrical Service
Life (Page 22) and
Table 3.
Check contact wear,
wipe.
Contact factory.
Vacuum
level.
Apply 10kV AC for 1
minute.
Check vacuum level
by withstand voltage
test.
If breakdown occurs,
contact Toshiba.
Lubrication
See Electrical Service
Life (Page 22).
Check grease on
interrupter shaft and
bearing washer
Lubricate if
necessary.