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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.
Part Name
Cooling fan
Main circuit smoothing capacitor
On-board smoothing capacitor
Relays
Fuse (FR-A740-03250 or higher)
*1 Estimated lifespan 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
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.
(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.
Removal (FR-A720-00080 to 03460, FR-A740-00060 to 02600)
1) Push the hooks from above and remove the fan cover.
FR-A720-00080 to 00175
FR-A740-00060, 00090
2) Disconnect the fan connectors.
3) Remove the fan.
Fan cover
Fan connection
connector
Fan
FR-A720-00080 to 00175
FR-A740-00060, 00090
* The number of cooling fans differs according to the inverter capacity.
Estimated lifespan
*1
10 years
10 years
*2
10 years
10 years
FR-A720-00240 to 00900
FR-A740-00120 to 00440
Fan cover
*
Fan
Fan connection
connector
FR-A720-00240 to 00900
FR-A740-00120 to 00440
Inspection item
Description
Replace (as required)
Replace (as required)
Replace the board (as required)
as required
Replace the fuse (as required)
FR-A720-01150 or more
FR-A740-00570 to 02600
Fan cover
*
Fan
Fan connection
connector
FR-A720-01150 or more
FR-A740-00570 to 02600
6
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