locked rotor code using a VFD
locked rotor code using a VFD
(OP)
I had to do a locked rotor test but unfortunately i was also using a VFD. The application was 415 V, 50Hz and the hp was 29.72. Locked rotor current recorded as the drive attained 50 Hz was 125A. Seemed low and due to the drive it wasn't a true instantaneous reading. Any suggestions?





RE: locked rotor code using a VFD
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: locked rotor code using a VFD
See IEEE Std 112 part 7 for details on how to perform that test. Normally the motor manufacturer makes this test for quality purposes.
RE: locked rotor code using a VFD
I appreciate the replies, please post more. Thanks
RE: locked rotor code using a VFD
That certainly does not describe an inverter. I would expect any data you would get on an inverter source to be invalid when operating on sine wave power regardless of the ampacity of the inverter.
RE: locked rotor code using a VFD
RE: locked rotor code using a VFD
Eng-Tips: Help for your job, not for your homework Read FAQ731-376