How can I avoid mechanical resonance at certain motor speeds?

VersiDrive i products contain a skip frequency function that can be used to set up a frequency band through which the AC drive output frequency may pass, but will never continuously operate in.

This is used typically to prevent continuous operation close to any frequency at which a mechanical resonance may occur. Such resonance may simply cause excessive acoustic noise or may in some cases cause mechanical stresses that could lead to mechanical failure.