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    What is a USF fault on the ATS48 (or ATS46) Soft Starters?

    Issue: 
    What is a USF fault on the ATS48 (or ATS46) Soft Starters?
     
    Product line:  
    Altistart ATS48 and ATS46
     
    Environment: 
    All models, all serial numbers
     
    Cause: 
    Run command on Run/stop without having mains voltage on L1 L2 L3 within 250 ms of the run command.    
     
    Resolution:
    The soft start checks for three-phase AC power at the L1, L2, and L3 terminals as soon as a RUN command is received. This fault appears if the soft start has a RUN command and does not have line power in all three phases within 250 ms. This fault is stored in the fault history. Probable Cause On a soft start with separately supplied control power:
    • The line-supply circuit breaker, line fuses, or isolation contactor is open.
    • The power board is defective.
    • Determine why the three-phase power is not present at the L1, L2, and L3 terminals of the soft start when it receives a RUN command. Rectify the power supply problem.
    • Verify the soft start's line voltage detection circuit by supplying only control voltage and verifying that nLP displays. Then apply a three phase line voltage and verify that RDY displays. If not, verify all internal soft start connections. If no problem is found, replace the power board.

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