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6
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inspection items
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
NOTE
For parts replacement, consult the nearest Mitsubishi FA Center.
NOTE
For parts replacement, consult the nearest Mitsubishi FA Center.
Inverter Type Fan Type Units
FR-D720-070 to 165
FR-D740-036 to 080
FR-D720S-070 and 100
MMF-06F24ES-RP1 BKO-CA1638H01 1
FR-D720-238, 318
FR-D740-120, 160
MMF-06F24ES-RP1 BKO-CA1638H01 2
The FR-D720-042 or less, FR-D740-022 or less, FR-D720S-008 to 042 are not provided with a
cooling fan.