Frequently asked questions
How can an ATS46 or ATS48 be used with an undersized motor or no motor?
FA89960
18 March 2022
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.