What Causes an StF Fault on an ATS48 Soft Starter and How Can It Be Resolved?
Resolution:
The StF fault on an ATS48 soft starter indicates that the starting time is too long (excessive starting time).
This typically means the motor did not reach full speed within the configured time limit.
Possible Causes and Solutions:
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Mechanical issues:
Inspect the driven equipment for wear, excessive friction, poor lubrication, misalignment, or blockages. -
Incorrect starting time setting (tLs):
Verify the tLs parameter in the PrO menu and adjust it if necessary to allow sufficient acceleration time. -
Improper sizing:
Ensure the soft starter and motor are correctly sized for the application’s load requirements.
Addressing these areas should help clear the fault and allow normal startup operation.
If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:
Frequently Asked Questions - Schneider Electric (se.com)
If this FAQ did not solve your issue, you can call us at 1-888-778-2733 Option 2 and then 4 or e-mail us atdrive.products.support@se.comto create a case with our Technical Support Team.
If you are not located in North America, please contact your local Customer Care Center for assistance:
Released for: Schneider Electric USA
