Re: electrical help needed: kinda ot

rtr@...
You have three phase coming in so you need to find a three phase
transformer to go from 220 to 440 or you need three single phase 220 to 440
transformers. If you can get two transformers that put out about double
the required current (see below), and you have a ghost phase coming in,
that is, there are really only two transformers on the pole stepping down
from the higher voltage lines to the 220 three phase coming into your shop,
you can use just these two heavier duty transformers on the real phases
coming in.

You need about twice the capacity on these two transformers because the
current for the ghost phase is still going through these two transformers.
You can usually discover with a voltmeter and a clamp on ammeter which is
the ghost phase. When you load it with this machine or any other, if you
are loading the ghost phase, the three voltages on the primary will be
further out of balance than if you are not loading the ghost phase.

The shop may be wired with a delta off which the main phase is split so you
get 120 volts on each end of that phase to the center of that phase, which
is grounded. When you look at the power pole, the large transformer is
providing that phase. You hook up one transformer across that to get two
legs of 440v. Then you hook up the stinger, the 208 volt to ground to
either leg of the main phase you already identified. Record your readings,
then disconnect from the main phase transformer and reconnect to the other
end of the main phase transformer. Record your readings again and, if it
is now more balanced than when hooked to the other leg, leave it.
Otherwise, disconnect it anc reconnect to the other leg.

Not as easy as the first two solutions.

The other way, and you are going to have to do this anyway if the
manufacturer can't find the prints, is to trace out the circuits. Time
consuming, but you can't really troubleshoot properly without a print, so
if you can't get one you must make one. Experienced people who do any more
than very simple troubleshooting without prints often burn up machines.

This sounds complicated, but it isn't electronics, it doesn't require a
scope, and it submits to any reasonably intelligent person for the price of
only a few pints of blood.

Good Luck,
Ted


----------

> From: mike grady <mgrady@...>
> To: CAD_CAM_EDM_DRO@onelist.com; rtr@...
> Subject: Re: [CAD_CAM_EDM_DRO] electrical help needed: kinda ot
> Date: Monday, June 14, 1999 7:32 PM
>
> From: mike grady <mgrady@...>
>
> I didnt make it clear, the problem is that most all the
> control, heaters, transformers, would have to be changed some 440 some

110(DC)

> hardinge is tring to find a wiring diagram, they said not to hold my

breath. thats why they said a step up transformer from 220

> to 440 would be the way to go just hook it up
>
> Ted wrote:
>
> > From: "Ted" <rtr@...>
> >
> > rtr@...
> > That's a control transformer, It takes line voltage and reduces it to
> > control voltage. Depending on the year, the secondary winding on the
> > transformer is typically 110, 12, 24, or 48 vac. Other voltages are
> > sometimes found. Just look at the devices fed by that transformer.

They

> > will be marked with the control voltage used on that machine. Of

course

> > it's easier if you have a copy of the wiring diagrams. Manufacturere

will

> > usually sell you a copy from their archives, though they sometimes will
> > give you a copy. If the primary uses four amps you will need a

220/240

> > or 208 volt (depending on your own mains) transformer that takes 8 amps

on

> > the primary. If it is the secondary winding that provides 4 amps, then

it

> > still only needs to provide 4 amps at the secondary voltage.
> >
> > Don't forget that overload protection and full voltage coils must be
> > changed to handle the halved voltage and the doubled current. Control
> > circuits do not require any changing.
> >
> > Any normal industrial electrical supplier should be able to provide a
> > transformer.
> >
> > Ted Robbins.
> > ----------
> > > From: mike grady <mgrady@...>
> > > To: CAD_CAM_EDM_DRO@onelist.com
> > > Subject: [CAD_CAM_EDM_DRO] electrical help needed: kinda ot
> > > Date: Monday, June 14, 1999 6:28 PM
> > >
> > > From: mike grady <mgrady@...>
> > >
> > > there is a lot of electrical/electronic knowledge on this list
> > > so I thought I would ask here
> > > I have a hardinge hct chucker that is 440v 3 ph
> > > hardinge recommended using a transformer to convert it to
> > > 220 instead of rewiring the control box
> > > on 440 it uses no more than 4 amps
> > > where can i get a transformer, hopefully cheap
> > > It mite get converted to cnc but I have to get it running first
> > >
> > > thanks
> > > mike
> > >
> > >
> > >
> > >

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