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7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.1 Inspection item
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 screws fixing the lower main circuit terminal cover, and remove the lower main circuit terminal cover.
2.
Disconnect the fan connector and remove the screws fixing the fan block to remove the fan block.
3.
Remove the fan fixing screws, and remove the fan.
Reinstallation
1.
After confirming the orientation of the fan, install the fan so that the "AIR FLOW" arrow faces up.
Fan
Fan block
Cooling fan fixing screw
Fan connection connector
3)
2)
1)
Lower main circuit
terminal block cover
AIR FLOW
<Fan side face>