Re: [CAD_CAM_EDM_DRO] Re: LARGE DC MOTOR speed control question

However, a highly reactive load will cause line losses due to phase shifted
current. One of my welding machines came with three big capacitors attached
to the input, the purpose of which being to counter the inductive load of a
500 pound transformer.

This welder only required a 100A circuit, yet the idle current was 70A due
to the caps. It doesn't show up directly at the meter, but some of it will
show up indirectly as heat dissipation in the line. I unplugged one
capacitor and the power cable ran cooler. As for the reduced power factor
correction at full load, I figure the power company should be happy with the
fact that the welder is idling more than it is welding. Give and take, so
to speak.

Doug

> > Standard home meters do NOT do that. they read real power draw, by
> > magnetically multiplying the instantaneous voltage times the
> > instantaneous
> > current. So, poor power factor, either due to reactive current or
> > non-linear
> > loads, do not affect power meters ability to read real power only.
>