Re: VFD problems with my Bridgeport CNC..

Howdy..

Vfd's are not very good with loads like transformers. I tried to
rewire the internal 3 phase boss transformers (steppers) to single
phase and worked on it for days. That is the main problem converting a
boss type machine to single phase. Other people are doing it somehow
thou. I see claims of that. I tried cutting the common armature bar in
between the 3 coils of the transformer. I nicked the windings and had
to trash it. I bought another transformer.

I totally redid the wiring in mine. Kept some of the boss wiring and
gutted the hardware. Even the cables out to the motors can be reused.

David




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mike Mueller"
<mueller914@y...> wrote:

> I have the feeling the FVD is "only" for the main spindle motor and

that it is not wise to try and power the entire machine with it???

>
> Am I correct here? I hooked up the VFD, turned the power on the

machine (I could hear only the fans run in the Boss 3 case) and the Hz
LED should on average of 13Hz until I turned the High/Low range knob
and got an error on the VFD.

>
> If it helps any, the VFD is a Hitachi L100-015nfu.
>
> Would a rotary phase converter be what i really need/want for this

application?

>
> thanks......