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Is NLP or STO faulty state? What about relay assigned to "no drive fault" will it signalize fault?

Published date: 27 February 2019

NLP states for "no line power". If you supply 24V for control circuit while power supply is missing you can configure the drive, exchange data via HMI, over communication, etc. It is not a fault state though drive will not accept run command.

STO on all drives that provides STO function likewise represnets normal state (not a fault). STO can normally occur during operation when operator activates STO input for example.

To sum up, none of NLP or STO triggers fault state, so relay assigned to "no drive fault" will signalize "no fault". 

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