[TheForge] Fwd: Shop tools & layount (3-phase converter)

Mon Jan 19 14:06:01 2004

Yeah,  Some discharge capcitors on an old Miller Tig welder taught me that
lesson one day.

Ralph
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, January 19, 2004 11:05 AM
Subject: Re: [TheForge] Fwd: Shop tools & layount (3-phase converter)

> Forgot to mention, and  this is important for all that don't know,
> capacitors can be dangerous. They will retain significant voltage and
> amperage after power has been cut to the device.   I would expect that
> the windings of the motor should bleed them down, but test them and the
> circuit with a voltmeter before touching anything.   Years ago I formed
> the very unprofessional habit of not only testing any circuit I was
> working on not only with a multimeter, but also shorting it with the
> shank of a screwdriver.  The multiimeter hasn't been wrong yet, but I
> can't seem to kick the habit.
>
> Charles
>
> [email protected] wrote:
>
> > Yes, to get optimum performance you should add run capacitors,
> > especially if you are only running a single motor off of the
> > converter.   I expect that your unit has both run and start.    The
> > run capacitors are there to balance the current, rather than
> > voltage.     For the average  home shop where you just want to be able
> > to run that single bargain industrial machine I would just wire up a
> > second motor of same or larger size as a rotary converter, use a rope
> > to start  it.   If your machine motor gets hot with your usage, then I
> > would go to the trouble of balancing the current with capacitors,
> > otherwise just keep it simple and be happy.    The power company
> > doesn't measure power factor for residentials.    For your situation
> > Ralph,  it would be worth monitoring the current with an amp meter and
> > adding capacitors as needed.
> >
> > Charles
> >
>
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  [email protected]
> password:  anvil
> ___________
>
>