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3.1 TROUBLE SHOOTING GUIDE
SYMPTOM
1. After switch on, the power light
doesn't lit
2. Control PC board indicator (LED
lamp) wasn't illuminated or
damaged.
3. Inverter – no display.
4. Inverter – displays ALM.
POSSIBLE CAUSE / REMEDY
A. NFB jumps off.
To check the main circuit-disconnect or short.
B. No power input.
To inspect the AC power input voltage and phase.
C. DC24V no output
(a) To inspect and make sure the switching power supply input
voltage is correct or not ?
(b) To Check the Fuse was burn down or not? If yes, please
replace new one.
D. Control PC board.
Please refer the item 2.
E. The indicator light breaks down.
(a) To make sure the voltage of indicator-DC24V.
(b) To inspect the indicator.
A. AC or DC power input disconnected.
To inspect power input voltage and phase.
B. Fuse burn down.
To inspect the F1 & F2 fuse working or not, If damaged, please
replace a new one.
A. Inverter has no power input.
Check if magnetic contactor is defective (replace).
B. Inverter has power input.
Check if inverter's digital remote panel is defective (replace).
A. Inverter driver display" ALM "data.
To make sure the display status, and refer the inverter driver
Trouble shooting.
6
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