Re: Need a circuit breaker.......

Bill,

The breaker-ized motor is $220 more than the unprotected version.
I'm not sure if there is another convenient mounting place for the
breaker on the motor. That's why I was trying to find a suitable
breaker assembly I could mount in the CNC control cabinet.

I've finally been given the specs for the breaker used by the motor
manufacturer. Hopefully a couple of these will arrive via my
friendly UPS man today.

thanks,

Doug

--- In CAD_CAM_EDM_DRO@y..., Bill Vance <ccq@x> wrote:
> So what's keeping you from removing the breaker, covering the hole,
and mounting
> the breaker on the frame somewhere convenient?
>
> Bill
>
> On Tue Mar 26 22:42:02 2002, Jon Elson, <elson@p...> wrote:
>
> >doug98105 wrote:
> >
> >> Peter,
> >>
> >> I know very well why the motors burned out. We're using the
machine
> >> to bar feed small parts. Once every year or so, we get a jam up
of
> >> cut-off parts which stops the Z axis from moving forward. Since
it
> >> runs unattended the servo burns up before anyone notices the jam
up
> >> problem.
> >>
> >> Normally I assume the servo amplifier would error-out with an
over
> >> current condition before the motor burned up except the machine
> >> builder chose to disable that function to get more performance
out of
> >> the motors (dumb??).
> >
> >Gasp! That may be illegal! Don't ever let OSHA catch you with a
disabled
> >safety feature.
> >
> >Do they really NEED that extra bit of performance?
> >
> >> The motor builder suggested the fuse or circuit breaker solution.
> >> They have become very familiar with this situation. I asked if
other
> >> users of this machine were having servo problems and had they
sold
> >> many replacement motors? The answer was, "yes, hundreds."
> >>
> >> As I mentioned, the motor builder now offers this motor with a
built-
> >> in 7 amp circuit breaker. Unfortunately, the circuit-breaker
type
> >> motor won't fit my particular version of the machine because of
> >> interference with the circuit breaker cover and the machine
> >> structure.
> >
> >Well, if a 7 A fuse will hold without fatigue failure or nuisance
trips, then
> >I'd definitely put it in. I'd also keep in mind that the maker of
this machine
> >is some sort of suicidal nut, and never buy anything from them
again!
> >
> >> Since the motor builder is using the 7 amp breaker I'm guessing
that
> >> must be a reasonable value for this motor. They tell me they
have
> >> had none of their breaker-ized motors burn up.
> >>
> >> I have since gotten the info from the motor builder regarding the
> >> circuit breaker they're using.
> >
> >Well, there's no reason except convenience to the motor manuf. for
> >the breaker to be ATTACHED to the motor, so you should be able
> >to put it anywhere. Since this is apparently a TESTED retrofit,
then
> >I'd go with the breaker, rather than spend the next couple months
> >worrying when the fuse is going to fatigue.
> >
> >Jon
>
> --
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