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6.6 Parts replacement
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The inverter consists of many esectronic ,parts such as. semiconductors.
The parts described below may deteriorate with time in electronical and
physical characteristics.
As preventive maintenance, therefore, these parts require to be replaced
periodically.
(11 Cooling fan
The service life of the bearings of the fan used to cool heatgenerating
parts such as main circuit semiconductors is ‘usually within a range from
10,000 to 35,000 hours. Hence, it ‘is necessary to replace the cooling fan
every 2 or 3 years.
If unusual noise and/or vibration is found during inspection, it is
necessary to replace thecooling fan.
Smoothing capacitor
For smoothing (rectification .of input power supply) , large-capacity aluminum
electric capacitors are used in the DC main circuit.
Its characteristics are, adversely affected by ripple current, etc.
When the invertey is used in normal air-conditioned environment, for
example, replace the capacitors about every 5 years.
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