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Over sizing VFD

Bob Johnson

Aluminum
Joined
Jul 25, 2004
Location
Coupeville, WA, USA
Are problems or issues typically encountered running a 7.5 HP or 10 HP motor from a 20 HP rated VFD? 3 Phase Input to the VFD would be supplied by my 10HP rated Phase Perfect.
 
No problems, just make sure you set the Thermal Overload or Motor Amps parameter (different VFDs use different names) correctly so the motor is properly protected.

John
 
Depending on what those motors are driving you could have problems with available power and input supply faults on the VFD. You may need another idler motor.

More details needed please.
 
Our local craig's list offered 20HP units for sale, but upon inquiery, they turned out to be only 5HP. I wanted to run a 7.5HP lathe motor on one, but not now. Thanks for the info.
 








 
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