Mitsubishi Electric FR-D720-0.1K Instruction Manual page 281

(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
1) Push the hooks from above and remove the fan
cover.
3.7K or lower
2) Disconnect the fan connectors.
3) Remove the fan.
3.7K or lower
Example for FR-D740-1.5K
Fan cover
Fan connector
Fan
5.5K or higher
5.5K or higher
Example for FR-D740-7.5K
Inspection items
Fan cover
Fan
Fan connector
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