Video: What would cause the ATS48 to show RDY even with a run command?

Resolution:
Confirmed that the +24V supply is still there.  Measure between 24V and COM on soft start.  If necessary remove wires off the terminals.
If in 2 wire control mode, make sure you have 24vdc on Run and Stop.
If you are doing 3 wire control make sure you have +24vdc on Stop and you are pulsing Start to get the soft starter to start.  Stop is normally closed and start is normally open push button contacts.
If you are doing NET control over a network  you will need to make sure +24vdc is supplied to the Stop input at all times.

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