Mitsubishi Electric FR-E720-0.4K Instruction Manual page 47

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Oil component of the heat dissipation grease used inside the inverter may leak out. The oil component, however, is not flammable, corrosive, nor conductive
and is not harmful to humans. Wipe off such oil component.
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It is recommended to install a device to monitor voltage for checking the power supply voltage to the inverter.

One to two years of periodic inspection cycle is recommended. However, it differs according to the installation environment.
For a periodic inspection, contact your sales representative.
NOTE
• Continuous use of a leaked, deformed, or degraded smoothing aluminum electrolytic capacitor (as shown in the table
above) may lead to a burst, breakage or fire. Replace such capacitor without delay.
9.2 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
Relay output terminals
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Estimated lifespan for when the yearly average surrounding air temperature is 40°C
(without corrosive gas, flammable gas, oil mist, dust and dirt etc.)
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Output current: 80% of the inverter rated current
NOTE
For parts replacement, consult the nearest Mitsubishi Electric FA Center.
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Estimated lifespan
10 years
10 years

10 years
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Replacement of parts
Description
Replace (as required)
Replace (as required)
Replace the board (as required)
As required
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