Mitsubishi Electric 800 Series Instruction Manual page 104

Replacement procedure of the 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 ambient temperature. When unusual noise and/or vibration are noticed during inspection, the cooling
fan must be replaced immediately.
NOTE
• Switch the power OFF before replacing fans. Even after the power supply is shut off, the inverter is charged and can cause
an electric shock. Before replacing the fan, make sure to check that the voltage across inverter main circuit terminals P/+ and
N/- has been dropped enough using a tester after 10 minutes or more after the power supply shutoff.
 Removal of the cooling fan (FR-A846-00250(7.5K) to 00470(18.5K))
(1) Remove the installation screws, and then remove the fan cover.
(2) Disconnect the fan connectors.
(3) Remove the installation screws, and then remove the fan.
Installation screw
Fan connector
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inspection item
Fan cover
Installation screw
5
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