That could work as well.

I thought this was part of your safety circuit to bring the power supply 
voltage down to zero ASAP.   As in "the motor is running away and I need 
to kill the drive".

Dave



On 10/2/2013 1:11 PM, andy pugh wrote:
> On 2 October 2013 17:33, Dave Cole <linuxcncro...@gmail.com> wrote:
>
>> When the power drops out the contactor drops out and will
>> not pull back in when the power recovers unless you push the "power on"
>> button.
> I think I am happy to trust this to HAL. I may add an input to HAL
> from the contactor "discharging mode active" and interlock that to the
> DC bus voltage so that I can't re-energise the PSU until the caps are
> down below a few volts.
>
> (There is a separate LinuxCNC-controlled contactor that powers up all
> the AC loads, servo PSU, VFD, Ikea LED lights…)
>

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