2X FLine vibration on vfd
2X FLine vibration on vfd
(OP)
How can 2X line frequency be at 60hz if a motor is operated by a vfd. Can someone please explain as this does not seem logical. If my intuition is correct; line frequency is relative to the vfd output frequency not the supply to the inverter.
RE: 2X FLine vibration on vfd
"....How can 2X line frequency be at 60hz if a motor is operated by a vfd. .... as this does not seem logical. If my intuition is correct; line frequency is relative to the vfd output frequency not the supply to the inverter".
1. I am of the opinion that the word "line" usually refers to the utility power source conductors. Not the conductors from the VFD output to the motor.
2. If the power source "line" is 60Hz, the frequency does NOT change, irrespective whether it supplies a VFD or the motor directly.
3. The VFD output frequency is adjustable. It is possible to adjust the VFD output frequency to 2x the input "line" frequency. The VFD output conductor can be subjected to 120Hz and actually at much higher carrier frequencies....etc
Che Kuan Yau (Singapore)
RE: 2X FLine vibration on vfd
Are you seeing 120hz vibration on a motor fed from vfd?
RE: 2X FLine vibration on vfd
Converting energy to motion for more than half a century
RE: 2X FLine vibration on vfd
I don't have any vote what line frequency should mean in this context. Less ambiguous terms might be utility frequency or vfd output working frequency, depending on what is meant.
My request to op: please rephrase your question in such a way that we don't have to parse "line frequency".