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8-1
8. Maintenance and Inspection
Proceed with daily inspection and periodic inspection to prevent malfunction and ensure long-term
reliability. Note the following:
8-1 Daily Inspection
During operation, a visual inspection for abnormal operation is completed externally without
removing the covers
The inspections usually cover the following:
(1) The performance (satisfying the standard specification) is as expected.
(2) The environment satisfies standard specifications.
(3) The keypad panel display is normal.
(4) There are no abnormal sounds, vibrations, or odors.
(5) There are no indications of overheating or no discoloration.
8-2 Periodical Inspection
Periodic inspections must be completed after stopping operations, cutting off the power source,
and removing the surface cover.
Note that after turning off the power, the smoothing capacitors in the DC section in the main circuit
take time to discharge. To prevent electric shock, confirm using a multimeter that the voltage has
dropped below the safety value (25 V DC or below) after the charge lamp (CRG) goes off.
！
WARNING
• Start the inspection at least five minutes after turning off the power supply for
inverter rated at 30HP or less, and ten minutes for inverter rated at 40HP or
more. (Check that the charge lamp (CRG) goes off, and that the voltage is 25V
DC or less between terminals P(+) and N(-). Electric shock may result.
• Only authorized personnel should perform maintenance and component
replacement operations. (Remove metal jewelry such as watches and rings.)
(Use insulated tools.))
• Never modify the inverter.
Electric shock or injury may result.
Table 8-2-1 Periodical inspection list
Check parts Check items How to inspect Evaluation Criteria
Environment
1) Check the ambient temperature, humidity,
vibration, atmosphere (dust, gas, oil mist,
water drops).
2) Is the area surrounding the equipment clear
of foreign objects.
1) Conduct visual
inspection and use
the meter.
2) Visual inspection
1) The specified
standard value
must be satisfied.
2) The area is clear.
Keypad panel 1) Is the display hard to read?
2) Are the characters complete?
1),2) Visual inspection 1),2) The display can
be read and is not
abnormal.
Structure such as a
frame or cover
1) Is there abnormal sound or vibration?
2) Are nuts or bolts loose?
3) Is there deformation or damage?
4) Is there discoloration as a result of
overheating?
5) Are there stains or dust?
1) Visual and aural
inspection
2) Tighten.
3),4),5) Visual
inspection
1), 2), 3), 4), 5) Not
abnormal
Common 1) Are there loose or missing nuts or bolts?
2) Are there deformation, cracks, damage, and
discoloration due to overheating or
deterioration in the equipment and insulation?
3) Are there stains and dust?
1) Tighten.
2),3) Visual inspection
1), 2), 3) Not
abnormal
Note: Discoloration
of the bus bar does
not indicate a
problem.
Main circuit
Conductor and
wire
1) Is there discoloration or distortion of a
conductor due to overheating?
2) Are there cracks, crazing or discoloration of
the cable sheath?
1),2) Visual inspection
1), 2) Not abnormal