Toshiba HCV-7HA Instruction Manual page 23

MAINTENANCE
Check Point Check Item
Operating Loose bolts,
Mechanism nuts or screws
Dust or foreign
matter inside
Electro-
magnets
Closing coil
Spring
Smooth
operation
Main Circuit Terminals and
movable
conductors.
Loose bolts,
nuts or screws
Vacuum
contact wear.
Vacuum level.
Dust on
surface of
vacuum
interrupter
Insulating Dust, foreign
Frame and matter or
Flanges damage
Control Auxiliary
Circuits Switch
Drive unit
Wiring
Table 2 - Check Points for Periodic Inspection
Check Method
Tighten using
screwdriver or
wrench.
Visual inspection.
Visual inspection.
Visual inspection.
Visual inspection.
Visual inspection
or touch. Check
lubrication.
Visual inspection.
Tighten using
screwdriver or
wrench.
Tighten using a
wrench.
See Electrical
Service Life
(Page 23).
Apply 10kV AC
for 1 minute.
Visual inspection.
Visual inspection.
See Table 3.
Visual inspection.
Visual inspection.
Tighten using a
screwdriver.
Criteria
Make sure all bolts, nuts and
screws are tight.
The contactor should be
clean and contain no foreign
matter.
Check for rust, discoloration,
wear, or loose mountings.
Check for discoloration, and
burned parts.
Check for rust, deformation,
discoloration, or damage.
Make sure moving parts
operate smoothly.
Make sure there is no
discoloration or loose
fasteners.
Make sure all bolts, nuts and
screws are tight.
Check contact wear and
wipe.
Check vacuum level by
withstand voltage test.
Make sure there is no dust
on the surface.
Make sure there is no dust,
foreign matter or breakage.
Contact wear and wipe.
Make sure there is no dust.
Check for overheating and
discoloration.
Check for discoloration and
tightness.
Page 19
Disposition
Tighten if loose. See
Table 1 for tightening
torque specifications.
Wipe with a clean dry
cloth.
Wipe with a clean dry
cloth.
Wipe with a clean dry
cloth.
Wipe with clean dry cloth.
Lubricate wipe surface if
needed or every 20,000
operations. (Toshiba B9
grease)
Apply a small amount of
lubrication. (Toshiba B9
grease)
Check the cause and
repair. Tighten
connections to the
contactor. See
Table 1 for tightening
torque specifications.
See Table 1 for tightening
torque specifications.
If wipe is too small
contact Toshiba.
If breakdown occurs,
contact Toshiba.
Wipe with a clean, dry
cloth.
Wipe with a clean, dry
cloth. If damaged,
contact Toshiba.
Replace if wear or
damage is excessive.
See Table 1 for tightening
torque specifications
Replace if damaged.
Repair if disconnected.
Tighten if loose. See
Table 1 for tightening
torque specifications.