Replacement procedure of the 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 are noticed during inspection, the
cooling fan must be replaced immediately.
Remove the fan cover fixing screws, and remove the fan cover.
Disconnect the fan connector and remove the fan block.
Remove the fan fixing screws, and remove the fan.
The number of cooling fans differs according to the inverter capacity.
After confirming the orientation of the fan, reinstall the fan so that the "AIR FLOW" faces up.
<Fan side face>
Install fans referring to the above figure. Tightening torque of the fan fixing screws is 0.73 N·m.
• Installing the fan in the opposite direction of air flow may shorten the inverter life.
• Ensure that the cables are not caught when the fan is installed.
• Switch OFF the power before starting the fan replacement work. To prevent an electric shock accident, keep the inverter with
its covers on during fans replacement since the inverter circuits are charged with voltage even after power OFF.
5. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
5.1 Inspection item