Frequently asked questions
What will cause an LRF fault on the ATS48 soft starters?
FA284569
28 September 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,