Re: [CAD_CAM_EDM_DRO] Question, 3ph line filter

Jon Anderson wrote:

> Jon,
>
> Thanks again for the feedback! I wasn't sure about where to mount it,
> but figured the leads from the inverter back to the rotary converter are
> a LOT longer than from the inverter to the motor, hence the better place
> to put it. I'd like to be able to put the inverter back on the mill, not
> on the wall. I have a box I want to use to house the inverter, braking
> resistor, filter, and 3 phase relay (for E-stop). This would really
> clean things up a lot.

Rotary converter? You use a rotary converter to feed the inverter?
I really think that is unneccesary, unless this is a VERY old
cycloconverter, rather than a true inverter. I'm using mine on single
phase input, although the manufacturer does not indicate that can be done.
I looked up the power block in the unit. It has rectifier diodes rated at
20 A continuous, and 400 A surge, I think. The output current per line is
3.3 A. This thing is rated to run at full load in a 50 C ambient with only
convection cooling. Some quick calculations indicated the diodes would
be within rating, and I'm running it at much lower temperatures. When I
run my high speed spindle at 400 Hz, the inverter warms up just a little,
so i put a small fan on it. I'm glad to not have the added noise of
an idler motor.

Jon