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What will cause an LRF fault on the ATS48 soft starters?

FA284569

23 January 2021

Issue:
ATS48 is showing LRF fault code.

Product Line:
Altistart ATS48 soft starters

Environment:
All

Cause:
Locked motor rotor. 

Resolution:
Locked rotor in steady state
This fault is only active in steady state with soft starter bypass contactor. It is detected if the current in a phase is greater than or equal to 5IN (five times the FLA) for more than 0.2 s.
Check the mechanism for wear, mechanical play, lubrication, blockages,