Chapter 8 Maintenance
180
Component Check Corrective Action
Printed Circuit
Board
(PCB)
Accumulation of
conductive dust of oil
Blow with dry, compressed
air( 39.2×10
4
to
58.8×10
4
Pa (4 to 6kg.cm
2
)
pressure), if dust and oil can not be
removed, then replace the board.
Cooling Fan
For abnormal noise and
vibration,
Accumulation of dust
and dirt
Replace the cooling fan, keep clean
Power
Components
Accumulation of dust
and dirt
Blow with dry, compressed
air(39.2×10
4
to
58.8×10
4
Pa(4 to 6kg.cm
2
)pressure)
Electrolytic
capacitor
Discoloration or odor Replace the capacitor
Braking resistor Isolation to earth is fine Put it on dry, insulation place
Don’t dismount or shake any part of the inverter and pull out the plug-ins when inspect,
otherwise the inverter will work in fault state and the keyboard will display the fault
code. Even worse, it may cause fault to component or damage to main part IGBT.
Using different meters may get different result.
Please use moving coil. Voltmeter to measure input Voltage and bridge voltage meter to
measure output voltage. Clamping ammeter is advised to measure input/output current
and electro-dynamic power meter is the best instrument to measure power. If condition is
limited, users can use the same meter to measure some times and take notes for
comparison.
For waveform testing, the scanning frequency of electric oscilloscope should be more
than 40MHz. For instant changing waveform, the Perfect frequency is over 100MHz.
Please isolate the mains electrical supply before the testing.
Recommendable wiring of main circuit electro measurement (Figure8-1) and
description (Table8-3) are the following:
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