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Precautions for maintenance and inspection
3
PROTECTIVE FUNCTIONS
(1) Cooling fan
The cooling fan is used to cool heat-generating parts such as the main circuit
semiconductors. The life of the cooling fan bearing is usually 10,000 to 35,000 hours.
Hence, the cooling fan must be replaced every 2 to 3 years if the inverter is run
continuously. When unusual noise and/or vibration is noticed during inspection, the
cooling fan must be replaced immediately.
<1.5K to 7.5K>
FR-F520J-1.5K, 2.2K, 3.7K MMF-06D24DS BKO-C2461H07
FR-F540J-1.5K, 2.2K, 3.7K MMF-06D24ES-FC4 BKO-CA1027H09
FR-F520J-5.5K, 7.5K
FR-F540J-5.5K, 7.5K
MMF-06D24ES-FC6 BKO-CA1027H17
FR-F520J-11K, 15K
FR-F540J-11K, 15K
MMF-08C24ES-RM1 BKO-CA1321H01
zRemoval
1) Remove the front cover and wiring cover.
2) Unplug the fan connectors.
The cooling fan is connected to
the cooling fan connector
beside the main circuit terminal
block of the inverter.
Unplug the connector and
separate the inverter from the
cooling fan.
3) Remove the cooling fan cover.
Disengage the fixing hooks
pointed by arrows to remove the
cooling fan cover.
4) Remove the cooling fan and
cooling fan cover.
The cooling fan is secured by
the fixing hooks.
Disengage the fixing hooks to
remove the cooling fan and
cooling fan cover.
1.5K to 3.7K 5.5K, 7.5K
1.5K to 3.7K
5.5K, 7.5K
AIR FLOW
AIR FLOW
AIR FLOW