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Inspection item
(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 (FR-F720P-2.2K to 110K, FR-F740P-3.7K to 160K)
1) Push the hooks from above and remove the fan cover.
FR-F720P-2.2K to 5.5K
FR-F740P-3.7K, 5.5K
2) Disconnect the fan connectors.
3) Remove the fan.
Fan cover
Fan connection
connector
Fan
FR-F720P-2.2K to 5.5K
FR-F740P-3.7K, 5.5K
* The number of cooling fans differs according to the inverter capacity.
336
FR-F720P-7.5K to 30K
FR-F740P-7.5K to 30K
Fan cover
*
Fan
Fan connection
connector
FR-F720P-7.5K to 30K
FR-F740P-7.5K to 30K
FR-F720P-37K or higher
FR-F740P-37K to 160K
Fan cover
*
Fan
Fan connection
connector
FR-F720P-37K or higher
FR-F740P-37K to 160K
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