99
8. Maintenance and Inspection
• Periodical Inspection
Periodically inspect the inverter as described in the following table to prevent accidents
and to ensure high performance with high-reliability.
• Part Replacement
Inverter’s maintenance periods are noted below. Keep them as reference.
Part Replacement Guidelines
Note: Usage conditions are as follows:
• Ambient temperature: Yearly average of 30°C.
• Load factor: 80% max.
• Operating rate: 12 hours max. per day.
Location to Check Check For Solution
Terminal, unit mounting
screws, etc.
Connection hardware is properly
seated and securely tightened.
Properly seat and tighten hardware.
Cooling fins Built up dust, dirt, and debris
Blow with dry compressed air:
39.2 X 10
4
to 58.8 X 10
4
Pa, 57 to 85 psi (4
to 6kg / cm
2
) pressure.
Printed circuit board
Accumulation of conductive
material or oil mist
Blow with dry compressed air:
39.2 X 10
4
to 58.8 X 10
4
Pa, 57 to 85 psi (4
to 6kg / cm
2
) pressure.
If dust or oil cannot be removed, replace the
inverter unit.
Power elements and
smoothing capacitor
Abnormal odor or discoloration Replace the inverter unit.
Cooling fan
Abnormal noise or vibration.
Cumulative operation time
exceeding 20,000 hours.
Replace the cooling fan.
Part Standard Replacement Period Replacement Method
Cooling fan 2 to 3 years Replace with new part.
Smoothing capacitor 5 years
Replace with new part.
(Determine need by inspection).
Breaker relays — Determine need by inspection.
Fuses 10 years Replace with new part.
Electrolytic capacitors on
PCBs
5 years
Replace with new board. (Determine need
by inspection).
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