Hitachi NEXT Series Instruction Manual page 106

Oil-free rotary screw air compressor
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9. MAINTENANCE [How to Service the Air Compressor]
[Fixed-Speed type]
Cleaning of Fan Inverter Cooling Fin
Fan inverter cooling fin
16 to 20 inches
(400 to 500) mm
Air blow nozzle
Bend the nozzle at 0.8 to 1.8 inches
(20 to 40 mm) from the end to
facilitate cleaning.
Fan inverter
Cooling fan connector
Fan inverter cooling fan
If dust adheres to the fan inverter cooling fin, cooling
performance of the fan inverter is decreased. Also, it
may cause shorten the life of smoothing capacitor and
power devices, and may cause components failures.
① Turn off the power and wait approximately 10
minutes. Next, remove the front door, cover of control
panel and right panel.
② Check that the charge light of fan inverter is off.
Then disconnect the connector of fan inverter cooling
fan from the fan inverter board.
③ Since fin cover and cooling fin are very hot soon after
the air compressor is stopped, wait until the fin cover
and cooling fin are cooled down properly before
starting the work. With holding the tab fixing the fan
inverter cooling fan by the fingers, pull the cooling fan
upward to remove.
④ Check the fan inverter cooling fin for dust and dirt.
Blow off the cooling fin by dry air using an air blow
nozzle with a bent end.
⑤ Assemble the fan inverter cooling fan in the reverse
procedure of disassembly. Then connect the fan
inverter cooling fan connector to the board connector.
⑥ Install the covers to their original locations.

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