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General Mach Discussion / Re: Lost communication with PLC after SS instal
« on: May 21, 2009, 10:24:47 AM »Now just to dial in this VFD . Just out of curiousity , what other devices are avail to control a 30hp spindle motor besides the vfd?Not really, if you have an induction motor a VFD or geabox is the only way and gearbox is what I had and only allows certain fixed speeds so its not the best. Now I have a 12.5KW AC Servo and it is great but unless you get lucky like I did then the price of that would be way beyond what you would like to spend I think, about $12k if I recall correctly, I got mine for about $600
I would imagine you would need a lot less than 30HP if you had a servo as they have constant torque from zero to rated speed where an Induction motor loses torque as the VFD slows it down so more HP is needed in the first place, or at least that is what I have found.
Hood