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How can an ATS46 or ATS48 be used with an undersized motor or no motor?

FA89960

23 January 2021

Issue:
ATS46 or ATS48 using an undersized motor or not using motor.

Product Line:
ATS46, ATS48

Environment:
All

Cause:
NA

Resolution:
A minimum load current is required for SCR conduction. Starter will trip on PHF (Phase Fault) if the motor current draw is less than 10% of the nominal motor current (adjustable down to 5% on ATS48).

A very small motor or motor loads that can not pull adequate current may require a smaller soft starter.
For testing purposes only, the SST parameter can be turned on under Level 3 parameters(drC menu on ATS48). This SST mode will automatically reset to "NO" when power is cycled.
SST will NOT allow the soft starter to operate with no motor.