7-2
Table 7.1 List of Periodic Inspections (Continued)
Check part Check item How to inspect Evaluation criteria
Terminal
blocks
Check that the terminal blocks are not
damaged.
Visual inspection No abnormalities
Braking
resistor
1) Check for abnormal odor or cracks in
insulators caused by overheat.
2) Check for wire breakage.
1) Olfactory and visual
inspection
2) Check the wires visually,
or disconnect either wire
and measure the
conductivity with a
multimeter.
1) No abnormalities
2) Within ±10% of the
resistance of the
braking resistor
DC link bus
capacitor
1) Check for electrolyte leakage,
discoloration, cracks and swelling of
the casing.
2) Check that the safety valve does not
protrude remarkably.
3) Measure the capacitance if necessary.
1), 2)
Visual inspection
3) Measure the discharge
time with capacitance
probe.
1), 2)
No abnormalities
3) The discharge time
should not be shorter
than the one specified
by the replacement
manual.
Transformer
and reactor
Check for abnormal roaring noise and odor.
Auditory, visual, and
olfactory inspection
No abnormalities
Main circuit
Magnetic
contactor
and relay
1) Check for chatters during operation.
2) Check that contact surface is not rough.
1) Auditory 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), 4)
Visual inspection
1), 2), 3), 4)
No abnormalities
Cooling fan
1) Check for abnormal noise and
excessive vibration.
2) Check for loose bolts.
3) Check for discoloration caused by
overheat.
1) Auditory and visual
inspection, or turn
manually (be sure to turn
the power OFF).
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
Remove dust accumulating on the inverter with a vacuum cleaner. If the inverter is stained, wipe it off with a chemically neutral
cloth.
7.3 List of Periodic Replacement Parts
Each part of the inverter has its own service life that will vary according to the environmental and operating conditions. It is
recommended that the following parts be replaced at the specified intervals.
When the replacement is necessary, consult your Fuji Electric representative.
Table 7.2 Replacement Parts
Part name Standard replacement intervals (See Note below.)
DC link bus capacitor 10 years
Electrolytic capacitors on printed circuit boards 10 years
Cooling fans 10 years
Fuse 10 years (90 kW or above)
(Note) These replacement intervals are based on the inverter's service life estimated at a surrounding temperature of 40°C at
100% (HD-mode inverters) or 80% (MD/LD-mode inverters) of full load. In environments with a surrounding
temperature above 40°C or a large amount of dust or dirt, the replacement intervals may be shorter.
Standard replacement intervals mentioned above are only a guide for replacement, not a guaranteed service life.
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