Re: Bridgeport 440 volts to 220 volts.

Well I guess I am not so sure I am right at all.
In getting my schematics out it shows heaters in the rear enclosure.
I have the machined pushed up against a wall right now and can not
open the door on it.
The manual confused me along with asking the wrong person where the
heaters would be. I was told in the ON/OFF switch and I assumed it
was the one up front. There is the main ON/OFF switch on the rear
enclosure. I would say it is safe to say that is the switch they are
refering to in the manual.
I have posted a few pictures that might show this better.

Thanks

Gary


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "vavaroutsos" <pete@v...>
wrote:

> I have a BOSS 6 and the heaters are in the rear enclosure. I'm
> looking at a picture of a BOSS 3 and I see the box you're refering
> to. My BOSS 6 does not have this box. I have a maintanence manual

for

> a BOSS 3 and the schematics in it look the same as my BOSS 6 in

this

> area, however, I'm sure you're right about the heater location

since

> you're looking at the real machine.
>
> Why don't you just try and run it and see if the heaters cut out?

If

> they do, just open the box and short the heaters for now.
>
> ~petev
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cncgramps"

<cncgramps@y...>

> wrote:
> > petev,
> >
> > It is a BOSS4 and my manual says the heaters are in the switch

box

> > that is up front. The one that changes motor direction for High

and

> > Low and has the E-Stop button.
> > I have looked and you can not see the heaters in this box.
> > The manual warns you of this and says it might be easier to

change

> > the whole switch.
> > Being on the cheap side I really do not want to spend money on

a

> > switch when I have one that is working already.
> > Except for the fact that the heaters are for 440.
> > Yes the wiring does seem easy enough if it wasnt for the

heaters.

> >
> > Gary
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "vavaroutsos"

<pete@v...>

> > wrote:
> > > Gary, what tye of CNC is this? Is it a BOSS 6 or older? If so,
> the
> > > heater is in the large power enclosure on the rear of the
> machine.
> > It
> > > is separate from the contactor and mounted next to it in the
> upper
> > > part of the enclosure. However, it's an old Sylvania part that

is

> > > hard/expensive to get. If you're not going to be running the
> > machine
> > > hard, just short the heater out until you retrofit the machine
> > (you
> > > will want to after you use the BOSS control).
> > >
> > > I converted my BOSS 6 from 440V to 220V by changing the wiring

on

> > the
> > > main stepper transformer and the 110V transformer. Don't worry
> > about
> > > the fuses unless your going to run the machine really hard. I
> have
> > > not had any problems and did not change the fuses. If you

don't

> > short
> > > the heater or change it, it will trip after running the

spindle

> > for
> > > several minutes.
> > >
> > > ~petev
> > >
> > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cncgramps"
> > <cncgramps@y...>
> > > wrote:
> > > > Jeff,
> > > >
> > > > Thanks for the reply.
> > > > I am starting to think it might be easier to replace the

switch.

> > > > Mine has the high/low switch plus it has the emergency stop
> > switch.
> > > > Bridgeport manual says the heaters are in the switch box and
> are
> > > > very hard to get at. I have looked and you can not see the
> > typical
> > > > coil type overload heaters.
> > > >
> > > > Thanks
> > > >
> > > > Gary
> > > >
> > > >
> > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "washcomp"

<jeff@w...>

> > > wrote:
> > > > > Gary:
> > > > >
> > > > > The motor starter is sometimes called the contactor. It

is

> > > > > sometimes combined with a safety switch (combination
> > starter).
> > > > The
> > > > > three things you look for:
> > > > >
> > > > > 1) The heaters (overloads) will be pretty ovbious to any
> > > > > electrician with motor experience. If you contact the
> > > > manufacturer
> > > > > of the starter, they can help you locate the heaters.
> > Depending
> > > > on
> > > > > the vintage of the starter, they may look like a losenge

with

> > a
> > > > > number on them or may look like a spring. They will break
> the
> > > > coil
> > > > > circuit if they are overloaded.
> > > > >
> > > > > 2) Check the coil voltage of the starter. If your tool

uses

> > > high
> > > > > voltage control, the coil may be 440v and have to be

changed.

> > > > >
> > > > > 3) Check the current rating of the starter. The motor

will

> > draw
> > > > > about twice as much current at the lower voltage. Since
> > starters
> > > > > are sized by current, if yours was marginal at 440 volts,

you

> > may
> > > > > need to change the starter.
> > > > >
> > > > > Regards,
> > > > > Jeff
> > > > >
> > > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, "cncgramps"
> > > > <cncgramps@y...>
> > > > > wrote:
> > > > > > --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson
> > <elson@p...>
> > > > > wrote:
> > > > > > >
> > > > > > >
> > > > > > > cncgramps wrote:
> > > > > > >
> > > > > > > >I am about to hook up a Bridgeport Series 1 CNC that

is

> > > wired
> > > > > for
> > > > > > > >440. I have the manuals and it shows and tells how to
> > change
> > > > to
> > > > > > 220
> > > > > > > >which I need to do.
> > > > > > > > The part that I am in question about is the overload
> > > heaters
> > > > > > that
> > > > > > > >are in the switch. The manual says they are hard to

get

> > at
> > > > and
> > > > > > that
> > > > > > > >they recommend getting a new switch wired for 220.
> > > > > > > > I looked in the switch box and I can not see the
> typical
> > > > > heaters.
> > > > > > > >Has anyone ever changed those overload heaters out so

as

> > to
> > > > be
> > > > > > able
> > > > > > > >to run on 220 volts?
> > > > > > > >
> > > > > > > >
> > > > > > > You just have the little 2 x 2 x 4" drum reversing

switch

> > on
> > > > the
> > > > > > motor?
> > > > > > > That has no heaters. The heaters would be in a device
> > called
> > > > > > a "motor
> > > > > > > starter" and usually are mounted right on one of the
> > > > > contactors.
> > > > > > These
> > > > > > > break the control circuit if the heaters get too hot,
> > > > indicating
> > > > > > the
> > > > > > > motor is drawing too much current on at least one

phase.

> > > That
> > > > > way,
> > > > > > > they protect the motor from overload, single phase
> > operation
> > > or
> > > > > > > internal shorts.
> > > > > > >
> > > > > > > If there are contactors in the motor box, one of them
> > should
> > > > have
> > > > > > > heaters on it. They may be quite small, like little
> > > > cartridges
> > > > > > that
> > > > > > > plug in. You will need to change them, as the current
> > draw
> > > on
> > > > > 220
> > > > > > > will be twice as high, and will cause the spindle to

shut

> > > down
> > > > > very
> > > > > > > easily.
> > > > > > >
> > > > > > > Jon
> > > > > >
> > > > > > No mine has a large box with a forward reverse "hi/low"
> > switch
> > > > > plus
> > > > > > an emergency switch.
> > > > > > The manual talks about the heaters being in the main
> switch
> > > box
> > > > > for
> > > > > > the motor and being hard to get at. Thus the reason for
> > > > replacing
> > > > > > the switch.
> > > > > >
> > > > > > Gary