AL.501 STO A signal lost or error – Delta servo troubleshooting

<= See All alarms of Delta servo

Name	Description	ALM	WRN	SRV ON	Clear Way
AL.501 STO A lost	STO_A lost (signal loss or signal error)	⊗		NO	Cycle power on

Causes	Checking Method	Actions
Loss of STO_A signal or STO_A and STO_B signals are not synchronized for more than 1 second.	Make sure the wiring of STO_A is correct.	Cycle power on the servo drive.

(The above information is referenced from Delta Electronics IMSBU)

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Other reasons	Checking Method	Actions

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