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What will cause intermittent instability in my drive speed?

Issue:
What will cause intermittent instability in my drive speed?

Product Line:
ATV21/ATV212

Environment :
All

Cause:
Drive ramps up to 60hz and down to 0hz intermittently

Resolution :
Verify the drive settings high and low speeds , sleep/wake , timeouts.
Verify the drive speed reference scaling.
Verify the drive input speed reference is stable.
Test the drive speed reference from a different input speed reference source.
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