Re: Converter or Inverter for 2hp Bridgeport mill

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "cncgramps" <cncgramps@y...>
wrote:

>
> cncGramps,

The model number that meets our requirements seems to be
the "Hitachi L100 015NFU ". As I am back to the day job tomorrow I
plan to try to pickup a second hand one over the coming weeks
through my techie contacts. Otherwise I believe that
www.automationdirect.com have them for $294

> I plan on coverting the drives on mine also.
> So the inverter sounds like a good way to go.
> Do you have a model number for the inverter and a place
> where you bought it?
> Is this a VFD?
>
> Thanks
>
> Gary
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ibewgypsie"
> <ibewgypsie@h...> wrote:
> > I used a toshiba single phase in, 3 phase out inverter. I used

the

> > bridgeport relay to turn on with dry contacts, left the overload

in

> > place (overkill since inverter monitors too). I gutted the cnc
> drives
> > and upgraded at that time too thou. Inverter works great.
> >
> > My phase convertor made the head rattle, inverter is much

smoother.

> > Money well spent. I have my machine on a 30 amp 220 single phase
> > circuit now. Like I said I upgraded the cnc drives too. The 3

phase

> > cnc drive transformer had to go.
> >
> > David Cofer
> >
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "john_glynn57"
> > <john_glynn57@y...> wrote:
> > > I have just taken delivery of my own Bridgeport mill and want

to

> > > know which is the best option for powering the machine : an
> inverter
> > > or a converter.
> > > My research to date suggests that a Hitachi L100 inverter is

the

> way
> > > to go however I want to question this as follows:
> > > 1. I can run a dedicated 20A or 30A supply to the machine

which

> > > should be able to handle the startup current demand of a
> converter.
> > > 2. If I use a converter I can use all the original Bridgeport
> > > systems without mosification ie Bridgeport speed

control,forward

> and
> > > reverse,3phase coolant pump and shaping unit which is attached
> to
> > > the machine.
> > >
> > > My plan is to circumvent the original Bridgeport wiring and
> drive
> > > the Main motor(s) directly from the hitachi unit and setting

the

> > > motor speed at the low speed of 1400 and not using the

valiable

> > > speed control of the machine at all. The hitachi will give me
> speed
> > > control by varying the frequency however I do intend to use

the

> > > original forward reverse switch. In addition I plan to replace
> the
> > > coolant motor with a single phase model.
> > >
> > > Am I doing the right thing.