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

Published date: 18 January 2019

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

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,
 

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