AL.003 Under Voltage – Delta servo troubleshooting

Name Description ALM WRN SRV ON Clear
Way

AL.003

Under Voltage

The voltage of the main circuit is lower than the standard voltage NO Auto cleared after the voltage returns to normal.

Causes Checking Method Actions
The input voltage of the main circuit is lower than the rated allowable voltage Check if the input voltage wiring of the main circuit is normal Re-confirm the voltage wiring
No power supply for the main circuit Use the voltmeter to see if the voltage of the main circuit is normal Check the power switch
Wrong power input

(incorrect power system)

Use the voltmeter to see if the power system matches the specification Apply to the correct power supply or serial adaptor

(The above information is referenced from Delta Electronics IMSBU)

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Other reasons Checking Method Actions
Capacitor charging circuit is abnormal (TN) If the power is turned off for a long time and then power-on, there is no “switching” sound of the internal relay. It may be that the soft start circuit is faulty and the capacitor charging is too slow and easy to occur. AL.003! Contact for repair

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