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Chapter 8 Maintenance
Component
Printed Circuit
Board
(PCB)
Cooling Fan
Power
Components
Electrolytic
capacitor
Braking resistor
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:
180
Check
Accumulation of
conductive dust of oil
For abnormal noise and
vibration,
Accumulation of dust
and dirt
Accumulation of dust
and dirt
Discoloration or odor
Isolation to earth is fine
Corrective Action
Blow with dry, compressed
4
air( 39.2×10
to
4
58.8×10
Pa (4 to 6kg.cm
pressure), if dust and oil can not be
removed, then replace the board.
Replace the cooling fan, keep clean
Blow with dry, compressed
4
air(39.2×10
to
4
58.8×10
Pa(4 to 6kg.cm
Replace the capacitor
Put it on dry, insulation place
2
)
2
)pressure)
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