Re: VFD problems with my Bridgeport CNC../rotary

Even with a rotary, make sure the inverter, the control 220/120 transformer
and other loads are on the input lines of the rotary. I'd have a electrician
check the outputs on the 3 phase transformer for the stepper drives. (cabinet
in the back in the left middle w 3 stacks) I think if my memory serves me, it
should be 68 volts per phase..

If you had some way of getting around the 3 phase stepper drives, you'd not
need 3 phase in the machine now you have a inverter.

DO you have manuals? I have a friend on another board who scanned a
bridgeport boss manual onto cdrom.. Them schematics are mighty helpful if
you want to repair or work on a boss type system. Mine bears no
resemblance to the orginal machine, except I reused the terminal strips,
capacitors, 220/120 120/24vdc transformer.
I have some spare boss parts somewhere. Bridgeport did the motors
unipolar. I have my machine running bipolar Larken cobra16 drives at 8
amps.. With all the work I did to mine it runs about as fast as it did stock.. 110
ipm. (same with racecars sometimes) Spence Jorgensen (HSM board) was
using a drip feed with a stock boss, it worked for him, not me...

David





--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Raymond Heckert"
<jnr@a...> wrote:

> Don't try to run the whole machine from the VFD, unless you can keep it's
> output at the B'Port's 'Rated' voltage. If your BOSS 3 has a variable speed
> spindle, use it, else use the VFD on the spindle only, and get a 'Rotary'
> for the rest of the machine.
>
> RayHex
>
> ----------
> > From: Mike Mueller <mueller914@y...>
> >
> > 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......