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5.3.7 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 failure of the inverter. For preventive maintenance, the parts must be changed
periodically.
The part replacement guidelines for the inverter are indicated in the following table. Lamps and other short-
life parts must also be changed during periodic inspection.
Replacement Parts of the Inverter
Part Name Standard Replacement Interval Description
Cooling fan 2 to 3 years Change (as required)
Smoothing capacitor in main circuit 10 years Change (as required)
Smoothing capacitor on control board 10 years Change the board (as required)
Relays
Change as required
Note: For part replacement, contact the nearest Mitsubishi FA center.
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Cooling fan
The cooling fan cools heat-generating parts such as the main circuit semiconductor devices. The life of the
cooling fan bearing is usually 10,000 to 35,000 hours. Hence, the cooling fan must be changed every 2 to 3
years if the inverter is run continuously. When unusual noise and/or vibration is noticed during inspection, the
cooling fan must be changed immediately.
#
Removal
1) Push the catches from above and remove the fan cover.
2) Disconnect the fan connector(s).
3) Remove the fan.
#
Reinstallation
1) After confirming the orientation of the fan, reinstall the fan so that the
arrow on the left of "AIR FLOW" faces up.
<Fan side face>
AIR FLOW
2) Reconnect the fan connectors.
When wiring, use care to avoid the cables being caught by the fan.
3) Reinstall the fan cover.
Fan cover
Fan
Fan connectors
<Example: FR-F540-5.5K>
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