MAINTENANCE
Page 19
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.
Electro-
magnets
Visual inspection. Check for rust, discoloration,
wear, or loose mountings.
Wipe with a clean dry
cloth.
Closing coil
Visual inspection. Check for discoloration, and
burned parts.
Wipe with a clean dry
cloth.
Spring
Visual inspection. Check for rust, deformation,
discoloration, or damage.
Wipe with clean dry cloth.
Lubricate wipe surface if
needed or every 20,000
operations. (Toshiba B9
grease)
Smooth
operation
Visual inspection
or touch. Check
lubrication.
Make sure moving parts
operate smoothly.
Apply a small amount of
lubrication. (Toshiba B9
grease)
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 the
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 23).
Check contact wear and
wipe.
If wipe is too small
contact Toshiba.
Vacuum level. Apply 10kV AC
for 1 minute.
Check vacuum level by
withstand voltage test.
If breakdown occurs,
contact Toshiba.
Dust on
surface of
vacuum
interrupter
Visual inspection. Make sure there is no dust
on the surface.
Wipe with a clean, dry
cloth.
Insulating
Frame and
Flanges
Dust, foreign
matter or
damage
Visual inspection. Make sure there is no dust,
foreign matter or breakage.
Wipe with a clean, dry
cloth. If damaged,
contact Toshiba.
Control
Circuits
Auxiliary
Switch
Contact wear and wipe.
Make sure there is no dust.
Replace if wear or
damage is excessive.
See Table 1 for tightening
torque specifications
Drive unit
Visual inspection. Check for overheating and
discoloration.
Replace if damaged.
Wiring
Visual inspection.
Tighten using a
screwdriver.
Check for discoloration and
tightness.
Repair if disconnected.
Tighten if loose. See
Table 1 for tightening
torque specifications.