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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.
Removal
1.
Remove the installation screws, and then remove the lower main circuit terminal cover.
2.
Remove the fan block fixing screws and the fan connector, and pull out the fan block.
3.
Remove the fan fixing screws and the fan connector, and remove the fan.
Reinstallation
1.
After confirming the orientation of the fan, reinstall the fan so that the "AIR FLOW" faces up.
AIR FLOW
<Fan side face>
2.
Install fans referring to the above figure. The tightening torque of the fan fixing screws is 0.73 N·m. The tightening
torque of the fan block screws is 1.42 to 1.89 N·m.
NOTE
• 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.
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5. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
5.1 Inspection item
Fan connection connector
Cooling fan fixing screw
Fan
3)
Fan block
Fan connection connector
2)
1)
Lower main circuit
terminal block
cover
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