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6
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
6.1.7 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.
Use the life check function as a guidance of parts replacement.
*1 Estimated lifespan for when the yearly average surrounding air temperature is 40°C
(without corrosive gas, flammable gas, oil mist, dust and dirt etc)
*2 Output current : 80% of the inverter rated current
(1) Cooling fan
The replacement interval of the cooling fan used for cooling the parts generating heat such as the main circuit
semiconductor is greatly affected by the surrounding air temperature. When unusual noise and/or vibration is noticed
during inspection, the cooling fan must be replaced immediately.
Part Name
Estimated lifespan
*1
Description
Cooling fan 10 years Replace (as required)
Main circuit smoothing capacitor 10 years
*2 Replace (as required)
On-board smoothing capacitor 10 years
*2 Replace the board (as required)
Relays
−
as required
Fuse (160K or higher) 10 years Replace the fuse (as required)
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.
• Removal (FR-A720-1.5K to 90K, FR-A740-2.2K to 132K)
1)Push the hooks from above and remove the fan cover.
2)Disconnect the fan connectors.
3)Remove the fan.
FR-A720-1.5K to 3.7K
FR-A740-2.2K, 3.7K
FR-A720-5.5K to 22K
FR-A740-5.5K to 22K
FR-A720-30K or higher
FR-A740-30K to 132K
* The number of cooling fans differs according to the inverter capacity.
FR-A720-1.5K to 3.7K
FR-A740-2.2K, 3.7K
FR-A720-5.5K to 22K
FR-A740-5.5K to 22K
FR-A720-30K or higher
FR-A740-30K to 132K
Fan cover
Fan cover
Fan cover
Fan
Fan
Fan
Fan connection
connector
Fan connection
connector
Fan connection
connector
*
*