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14. MAINTENANCE AND INSPECTION
The general purpose inverter is a piece of equipment consisting mainly of semiconductor elements. To
prevent troubles occurring due to environmental conditions such as high temperature, humidity, dust, intense
vibration, etc. or component deterioration, it is necessary to carry
out
periodic inspection.
Precautlon durlng Malntenance and Inspection
After the power is switched off, the capacitor remains charged at high voltage for a while. Remove
the front cover and wait until the
POWER
lamp (see page 9) on the printed circuit board is turned
off, then (approximately 2 minutes later) begin maintenance and inspection.
inspection Points
(1)
Daily Inspection
In general, check the following points during operation.
(a) The motor operates properly.
(b) The environment is normal.
(c)
The cooling system is normal.
(d)
There is
no
unusual vibration or noise.
(e) There is no overheating or discoloration in any component.
During operation, check inverter input/output voltage with a multimeter.
Check the following periodically with the inverter removed from mains circuit.
(a)
(b)
(c)
(d)
Measure insulation resistance.
(e)
(2)
Periodic Inspection
Check that the cooling system is in good condition. Clean air filters, of cabinet, etc.
Screws, bolts, nuts, and other fasteners may become loose with time due to vibration, thermal expansionlre-
traction etc. Check carefully and tighten loose screws and other fasteners.
Check if any conductor or insulator is corroded or damaged.
Check the cooling fan, smoothing capacitor, and relay. If any component is defective, replace it.
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