On Thu, 18 Aug 2011, andy pugh wrote:
> Date: Thu, 18 Aug 2011 23:09:55 +0100
> From: andy pugh <bodge...@gmail.com>
> Reply-To: "Enhanced Machine Controller (EMC)"
> <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: Re: [Emc-users] On the status of BLDC component and Hostmot2
>
> On 18 August 2011 20:27, John Prentice <j...@castlewd.freeserve.co.uk> wrote:
>
>> I suspect there could be a coding problem in 3pwmgen. The documentation and
>> the loaded component have "fault" as an output pin. All the description of
>> it suggests it should be an input (e.g. it disables the generator, the
>> invert pin alters it being active high/low etc.)
>
> It's been a while since I looked, but I think it was correct. There is
> a physical pin that the 7i39 uses to indicate that it has faulted, and
> a HAL pin to echo that status, IIRC. The physical pin is an input to
> the FPGA 3pwmgen, the "fault" HAL bit is an output.
The 7I39 doesnt use the pin but its fed through one of the sense pins I
believe.
The external fault input is for things like IGBT modules that have a
overcurrent/overtemp fault output pin. Its a latched input (with a ~100 ns
glitch filter) that turns off all PWM outputs and requires the host (EMC in
this case) to react to the fault HAL pin and re-enable the outputs
Peter Wallace
Mesa Electronics
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