Frequently asked questions
What will cause an LRF fault on the ATS48 soft starters?
28 September 2021Issue:
ATS48 is showing LRF fault code.
Altistart ATS48 soft starters
Locked motor rotor.
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,