Torsional Vibration Problem with VFD Motor / ID Fan

Paper No. 102
 
Torsional Vibration Problem with VFD Motor / ID Fan
 Uptime Magazine, August / September 2013

 
An induced draft (ID) fan system at a refinery experienced a failure of the spool piece in the flexible disc coupling. EDI performed field tests to diagnose the cause of the coupling failure. The VFD was exiciting a torsional resonance within the operating speed range. An alternate coupling containing rubber blocks was recommended to solve the torsional vibration problem.
 
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