Fault Finding Method of AF60W Series Frequency Converter

Fault Finding Method of AF60W Series Frequency Converter / AC Power Supply

1.The buzzer alarm and the LED marked"GL/LED3" is lighting up in the motherboard,it means over current alarm.

If there is no load units,the IGBT module and the Driven Circuit Board may be faulty,please check them as per instruction showing in Part D
If there load units,please cut off some loads.

2.The buzzer alarm and the LED which marked"GR/LED1" is lighting up in the motherboard,it means over heat alarm.

Please check the exhaust fans,they may not work or its speed becomes slow.replace new ones or reduce some load units.

3. The buzzer alarm and the LED which marked"GY/LED2" is lighting up in the motherboard,it means over voltage alarm.

Please check the output Filtering Capacitors showed in Part F,test it to see how many μF it is,if it's about 0.3 μ F (almost zero)when it should be 30μ F,50 μ F... which is showed in the label.it tells they are faulty,please replace the new ones.

Note,please disconnect the capacitors from the unit before test it with meter.

1.The display shows output voltage is much lower than the setting voltage Please check the buffering circuit modules. If you can feel the heating come from the buffer resistance obviously or the resistance looks been burn it can tell the static switch is faulty.
2.If the panel display is not lighting up after press the“start”button, please check the "Power off/on Board"showed in Part E,please test to see if it's +-DC17V or +- DC12V shown on the part E,if not,it tells this board is faulty.

How to know the mother board is faulty or not.

For the 3 phase unit, each phase is independent.the motherboard connected each phase driven circuit board with a single gray flat-cables,so there are 3 gray flat cables here Action:turn off the unit first ,then Please disconnect the 3 gray flat-cables from the mother board,now turn on the converter to see if the alarm is still there,if yes,it means the mother board is failed.If No,it means the mother board is good.