Chapter 7 MAINTENANCE AND INSPECTION
Check part Check item How to inspect Evaluation criteria
Main circuit
capacitor
1) Check for electrolyte leakage,
discoloration, cracks and
swelling of the casing.
2) Check that the safety valve
does not protrude or extend
remarkably.
3) Measure the static capacitance
as necessary.
1)，2)
Visual inspection
3) Measure the discharging
time using a static
capacitance meter.
1)，2)
No abnormalities
3) The discharging time should
not be shorter than the
value specified in the
replacement procedures.
Transformers
and reactors
Check for abnormal roaring noise or
odor when the inverter is running.
Audio, visual, and olfactory
inspections
No abnormalities
Main circuit
Magnetic
contactors
and relays
1) Check for chatters when the
inverter is running.
2) Check that the contact point is
not rough.
1) Audio inspection
2) Visual inspection
1)，2)
No abnormalities
Control circuit
Printed circuit
board
1) Check for loose screws and
connectors.
2) Check for odor and
discoloration.
3) Check for cracks, breakage,
deformation and remarkable
rust.
4) Check the capacitors for
electrolyte leaks and
deformation.
1) Retighten.
2) Olfactory and visual
inspection
3) Visual inspection
4) Visual inspection
1)，2)，3)，4)
No abnormalities
Cooling
fan
1) Check for abnormal noise or
excessive vibration.
2) Check for loose bolts.
3) Check for discoloration caused
by overheat.
1) Audio and visual
inspection; Turn by hand.
(Be sure to turn the power
OFF beforehand.)
2) Retighten.
3) Visual inspection
1) Smooth rotation
2)，3)
No abnormalities
Cooling system
Ventilation
path
Check the heat sink, intake and
exhaust ports for clogging and
foreign materials.
Visual inspection No abnormalities
If any section is stained, clean it with a chemically neutral dust cloth. Dust should be cleaned with a
vacuum cleaner.
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