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Why does my Process Drive have an ASF LED Illuminated.

ASF LED Indicates that the safety function is activated. Status of LED at different events is as follows:

Possible causes are:
  • Exceeded delay between STOA and STOB signals > 1 s 
  • Internal hardware detected error. Verify the wiring of the digital inputs STOA and STOB.

For more details on safety function of Process Drives, please refer to the appropriate Safety Function Manual. The Safety Function Manuals for the ATV6xx and ATV9xx are attached. 

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