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Precautions for maintenance and inspection
3.3.7 Replacement of parts
The inverter consists of many electronic parts such as semiconductor devices.
The following parts may deteriorate with age because of their structures or physical
characteristics, leading to reduced performance or fault of the inverter. For preventive
maintenance, the parts must be replaced periodically.
*The design life of electrolytic capacitor is about ten years (87000h) if used for 24
hours a day and 365 days a year in the average yearly ambient temperature of 40°C .
Part Name
Standard Replacement
Interval
Description
Cooling fan 2 to 3 years Replace (as required)
Main circuit smoothing
capacitor
10 years * Replace (as required)
On-board smoothing
capacitor
10 years * Replace the board (as required)
Relays — Replace as required
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.