On Thu, 8 Aug 2024 at 10:13, Viesturs Lācis <viesturs.la...@gmail.com> wrote:
> Last missing piece in my puzzle is something to switch the discharge > resistor. What are other folks using there? Simple 1 pole relay? I have used a simple mains-coil relay that just closes the crowbar when the power to the PSU goes off. A danger with this approach is if the power to the PSU is only interrupted for a short period, then the relay discharge poles try to break a high DC voltage which they do not seem to enjoy. It is probably OK with the correct relay, but 400V DC switching relays are expensive: https://uk.rs-online.com/web/c/relays-signal-conditioning/relays/power-relays/?applied-dimensions=4294524932 So, I am using a HAL interlock which prevents re-energising the DC PSU if the bus voltage > 5V (in fact it locks out the machine-on button in the GUI) -- 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
