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What is an SOF fault code on the ATV12 drives?

Issue:
SOF fault code on the ATV12.

Product Line:
Altivar ATV12

Environment:
Any

Cause:
• Instability
• Overspeed associated with the inertia of the application

Resolution:
• Check the motor
• Overspeed is 10% more than Maximum frequency tFr page 57 so adjust this parameter if necessary
• Add a braking resistor
• Check the size of the motor/drive/load
• Check parameters of the speed loop (gain and stability)