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8-2
Terminal block Is there damage? Visual inspection Not abnormal
Main circuit
Smoothing
capacitor
1) Is there electrolyte leakage, discoloration,
crazing, or swelling of the case?
2) Is the safety valve not protruding or are
valves protruding too far?
3) Measure the capacitance if necessary.
1), 2) Visual inspection
3) * Estimate life
expectancy from
maintenance
information and from
measurements using
capacitance
measuring
equipment.
1), 2) Not abnormal
3) Capacitance ≧
initial value x 0.85
Resistor 1) Is there unusual odor or damage to the
insulation by overheating?
2) Is there an open circuit?
1) Visual and
olfactory inspection
2) Conduct a visual
Inspection or use
a multimeter by
removing the
connection on one
side.
1) Not abnormal
2) Less than about
±10% of the
indicated
resistance value
Transformer
and reactor
Is there abnormal buzzing or an unpleasant
smell?
Aural, olfactory, and
visual inspection
Not abnormal
Main circuit
Magnetic
conductor and
relay
1) Is there rattling during operation?
2) Are the contacts rough?
1) Aural inspection
2) Visual inspection
1),2)Not abnormal
Control circuit
Control PC
board and
connector
1) Are there any loose screws or connectors?
2) Is there an unusual odor or discoloration?
3) Are there cracks, damage, deformation, or
excessive rust?
4) Is there electrolyte leakage or damage to
the capacitor?
1) Tighten.
2) Visual and olfactory
inspection
3) Visual inspection
4) * Estimate life
expectancy by visual
inspection and
maintenance
information
1),2),3),4)Not
abnormal
Cooling fan 1) Is there abnormal sound or vibration?
2) Are nuts or bolts loose?
3) Is there discoloration due to overheating?
1) Aural and visual
inspection. Turn
manually (confirm the
power is off).
2) Tighten.
3) Visual inspection
4) * Estimate life
expectancy by
maintenance
information
1) The fan must
rotate smoothly.
2), 3) Not abnormal
Cooling system
Ventilation Is there foreign matter on the heat sink or intake
and exhaust ports?
Visual inspection Not abnormal
Note: If equipment is stained, wipe with a clean cloth. Vacuum the dust.
∗Estimation of life expectancy based on maintenance information
The maintenance information is stored in the inverter keypad panel and indicates the
electrostatic capacitance of the main circuit capacitors and the life expectancy of the electrolytic
capacitors on the control PC board and of the cooling fans. Use this data as the basis to
estimate the life expectancy of parts.
1) Determination of the capacitance of the main circuit capacitors
This inverter is equipped with a function to automatically indicate the capacitance of the
capacitors installed in the main circuit when powering up the inverter again after disconnecting
the power according to the prescribed conditions.
The initial capacitance values are set in the inverter when shipped from the factory, and the
decrease ratio (%) to those values can be displayed.
Use this function as follows: