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Why is the SFR switching frequency upper range limited on an ATV61/ATV71?

Issue:
Why is the SFR switching frequency upper range limited on an ATV61/ATV71?  Expecting adjustment to 16kHz, but limited to just 2.5kHz.

Product Line:
ATV61 ATV71

Environment:
All

Cause:
NA

Resolution:
If the Motor surge limit, parameter SUL in the Motor Control menu, is set to YES, the switching frequency is limited.
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