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How to troubleshoot an ATS48 soft starter with no +24vdc power supply.
Missing the +24vdc power supply
1st Check the 120vac.230vac control voltage on CL1 CL2
2nd Check the +24vdc to com terminals make sure you meter is DC voltage range.
3rd Check J6 ribbon cable on the power board inside the soft starter. There are 2 sets of twisted pairs of wires one set will have +24vdc and one set will have +10vdc. If you are missing his power supply then you may have an issue with the power board. If you have these voltages then it might be a problem with the MCB Main control board.