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Inspection item
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 Replacement years for when the yearly average surrounding air temperature is 40°C (104°F)
(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 Standard Replacement Interval *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 Replace the board (as required)
Relays
−
as required
Fuse (FR-F740-04320 or more) 10 years Replace the fuse (as required)
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.
• Removal (FR-F720-00105 to 04750, FR-F740-00083 to 03610)
1) Push the hooks from above and remove the fan cover.
2)Disconnect the fan connectors.
3)Remove the fan.
* The number of cooling fans differs according to the inverter capacity.
FR-F720-00105 to 00250
FR-F740-00083, 00126
FR-F720-00340 to 01250
FR-F740-00170 to 00620
FR-F720-01540 or more
FR-F740-00770 to 03610
Fan cover
Fan cover
Fan cover
Fan
Fan
Fan
Fan connection
connector
Fan connection
connector
Fan connection
connector
FR-F720-00105 to 00250
FR-F740-00083, 00126
FR-F720-00340 to 01250
FR-F740-00170 to 00620
FR-F720-01540 or more
FR-F740-00770 to 03610
*
*