Re: [CAD_CAM_EDM_DRO] Re: Need a circuit breaker.......

Hi Doug;

Well I _was_ refering to the frame of the machine rather than the motor itself,
but it sounds like you're getting it handled. As to the hole itself, there's no
job that can't be handled, given the suitably creative application of enough
duct tape.....:-)

Bill

On Wed Mar 27 07:30:44 2002, doug98105, <dougrasmussen@...> wrote:

>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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