Replacement Of Parts - Mitsubishi Electric FR-A720-0.4K Instruction Manual

5.1.6

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 (160K or higher)
*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
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-A720-1.5K to 90K, FR-A740-2.2K to 132K)
1) Push the hooks from above and remove the fan cover.
FR-A720-1.5K to 3.7K
FR-A740-2.2K, 3.7K
2) Disconnect the fan connectors.
3) Remove the fan.
Fan cover
Fan connection
connector
Fan
FR-A720-1.5K to 3.7K
FR-A740-2.2K, 3.7K
* The number of cooling fans differs according to the inverter capacity.
Estimated lifespan
*1
10 years
10 years
*2
10 years
−
10 years
FR-A720-5.5K to 22K
FR-A740-5.5K to 22K
Fan cover
*
Fan
Fan connection
connector
FR-A720-5.5K to 22K
FR-A740-5.5K to 22K
Inspection item
Description
Replace (as required)
Replace (as required)
Replace the board (as required)
as required
Replace the fuse (as required)
FR-A720-30K or higher
FR-A740-30K to 132K
Fan cover
*
Fan
Fan connection
connector
FR-A720-30K or higher
FR-A740-30K to 132K
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