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What causes an StF fault on an Altistart 22 soft starter?

Issue:
What causes an StF fault on an Altistart 22 soft starter?

Product Line:
ATS22

Environment:
All serial numbers for ATS22

Cause:
N/A

Resolution:
The StF fault means the starter has exceeded the maximum start time setting tLS in the SEt menu.  
tLS needs to be set higher then the ACC time.   Example:  If ACC ramp up time is 10 seconds, set the tLS max starting time to 20 seconds.
If ILt current limit is too low, the motor may not reach full speed within tLS limit.
Mechanical problems on the load may prevent the motor from reaching full speed within tLS limit.


CTA-ID : 2062501
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