I have recently acquired a Hardinge SuperSlant 4-axis machine
requiring 18.8 kva of 3-phase power.
I also have a 60hp inverter.
Does anyone have any experience using a vfd to produce 3-phase
for use in a CNC environment. It has been suggested that the
stepped nature of the 3-phase output (instead of pure sine wave)
may cause the computer to mis-clock, get programming glitches,
or just generally crap-out.
Any opinions or suggestions will be appreciated.
John R. Packwood
vdmmedia@arches.uga.edu
vfd use with CNC
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Re: vfd use with CNC
John
It depends on the quality of the transformer on your power supply for the control and the Quality/Size of filter capacitors.
The controls generally convert incoming computer power to DC before using it in the circuts so wave form is meaningless .
If you are really concerned with a "dirty" VFD, then you may want to throw an isolation transformer in before the "control transformer" to get a better sinewave.
My experience with dirty VFD's is more with RF energy and it's effects. but we doubled our isolation area anywayto stop line surges
It depends on the quality of the transformer on your power supply for the control and the Quality/Size of filter capacitors.
The controls generally convert incoming computer power to DC before using it in the circuts so wave form is meaningless .
If you are really concerned with a "dirty" VFD, then you may want to throw an isolation transformer in before the "control transformer" to get a better sinewave.
My experience with dirty VFD's is more with RF energy and it's effects. but we doubled our isolation area anywayto stop line surges