Kent A. Reed wrote: > Still, Roger's comment intrigues me. A home-based shop could cause > mystifying problems in the household if the power factor gets out of > hand. Do VFDs really make this a non-issue? > Unless you have REALLY marginal power, such as a 60 A 240 V feed, and central air conditioning, electric clothes dryer, etc. I just wouldn't worry about power factor.
Yes, modern VFDs are designed to keep the power factor relatively high, maybe 80% or so worst-case. They do give a non-linear distortion by drawing their current at the voltage peaks, but the phase angle is kept small. Probably the BEST feature in this regard is slow-start. You can set the acceleration ramp for a fraction of a second, and there is no dimming of lights when large motors are started. If I had my 7.5 HP lathe on an RPC, I know the lights would dim appreciably when I started it. Jon ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
