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

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@...> 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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