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Precautions for Maintenance and Inspection
3.2.7 Replacement of parts
The power regeneration common converter 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 power regeneration common converter. For preventive maintenance, the
parts must be changed periodically.
The part replacement guidelines for the power regeneration common converter are indicated in the following table.
Lamps and other short-life parts must also be changed during periodic inspection.
Replacement Parts of the power regeneration common converter
(1) 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. Change the cooling fan in the following procedure.
z Heat sink outside mounting structure model
FR-CV-7.5K to 30K, FR-CV-H11K to H30K
1) Disconnect the wiring of the power regeneration common converter unit and remove the unit from the
enclosure.
2) Remove the screws that fasten the cooling fan.
3) Unplugging the connector of the cooling fan removes the cooling fan from the unit.
4) Replace the cooling fan. Reinstall the cooling fan so that the arrows of the fan point in the directions as shown
above.
5) Reinstall it to the power regeneration common converter unit in the reverse procedure.
Part Name Standard Replacement Interval Description
Cooling fan 2 to 3 years Change (as required)
Smoothing capacitor in main circuit 5 years Change (as required)
Smoothing capacitor on control board 5 years Change the board (as required)
Relays —— Change as required
Note: For part replacement, contact the nearest Mitsubishi FA center.
Note: If the air flow is set in the wrong direction, the inverter life can be shorter.
Unplug
connector.
Remove
screws.
FR-CV Cooling fan