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How do I troubleshoot an ATS48 soft starter with no +24vdc power supply?

Published date: 24 June 2020

ATS48 soft starter with no +24vdc power supply

Product Line:
Altistart ATS48


Missing the +24vdc power supply


  1. Check the 120VAC or 230VAC control voltage on CL1 and CL2
  2. Check the +24vdc to com terminals make sure you meter is DC voltage range.
  3. 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 these voltages are not present, 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.

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