On Wed, 7 Aug 2024 at 03:08, John Dammeyer <jo...@autoartisans.com> wrote:
> Here's what I did for my DC Servos. The external micro-controller sets a > timer after it starts up and when the timer is done it asserts the control to > close the relay. I did this once with a 555. The second time I realised that there was only any chance of a load current being present if LinuxCNC is active to enable the 8i20, so I moved the relay control to HAL. So, initially the relay is open and the incoming mains supply runs through a 100W power resistor (I can't remember if it is 100R or 10R). Once the Bus Voltage reported by the 8i20 itself reaches 300V then the HAL logic closes a relay that bypasses the resistor. This also generates an "Amp power OK" signal that enables the amps and the machine motion. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
