Re: [CAD_CAM_EDM_DRO] G201-IP

On Saturday 23 November 2002 16:41, mariss92705 wrote:

> Hi,
>
> I have breadboarded a protection circuit for the G201. It protects
> against:
>
> 1) Shorting any or all motor wires to ground.
> 2) Shorting any motor phase to phase.
> 3) Miss-phased motors (series or parallel).
> 4) Miss-connected motors.
> 5) Internal motor winding shorts (serial-killer motors).
> 6) Motor connects/disconnects while under power.
> 7) Motor winding short to motor case.
> 8) Unused 6-wire motor leads touching/shorting anywhere.
>
> These are the most common drive failure problems (>95%) that we see
> for return/repair.
>
> The circuit works internally on the "DISABLE" input (term. #7) of the
> drive. Any of these faults would latch it low (disable). It would
> then require a recycling of the power supply to clear the fault.
> The "Fault" indication would be a "0" on the "DISABLE" terminal.
>
> The "IP" in G201-IP stands for "current protect", or as a cruel
> individual here pointed out, it can also read "Idiot Protect".
>
> This circuit (about 20 additional components to the existing 136)
> would require a major revision (REV-8). Of course it would be 100%
> compatible, pinout, function and form, with all previous drives.
>
> What I am throwing out to the group here is:
>
> (1) Is it worth the effort to do this?
> (2) Is it worth a $15 premium to do have this protection? That is the
> all-up cost of the additional parts.
>
> We will continue to produce the G201 regardless if there is or is not
> a G201-IP. It will not in any way supplant it.
>
> The G201-IP might be useful for those that are using the drive for
> the first time and want a little extra margin against Mr. Murphy and
> his Law. Later, after everything has settled out, stock G201s would
> serve as well. Others that are a little more tense/prudent may wish
> to have it as protection against Mr. Murphy should he call uninvited
> at a later time.
>
> If I'm going to do this, my schedule has it for the end of the first
> quarter. What I'm looking for is feedback if this is wanted/needed.
>
> Thanks.
>
> Mariss
>
>
>
>
>
>
>
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Looks like a good investment. All sorts of strange things can happen even if
you are careful and know what you are doing 8o(
--
Keith Bowers - Thomasville, NC