ceturtd., 2024. g. 8. aug., plkst. 14:44 — lietotājs andy pugh (<bodge...@gmail.com>) rakstīja: > > 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) >
I want to thank all of you for the hints and tips!!! I ended up ordering: 1) 3 pcs of resistors for limiting inrush current when charging capacitor: https://www.tme.eu/lv/en/details/r100w-47r/power-resistors/sr-passives/ 2) 1 pcs contactor to bypass resistors when capacitor charged: https://www.tme.eu/lv/en/details/mc-18b-24vdc/contactors-main-modules/ls-electric/mc-18b-24vdc-1a1b/ 3) 1 pcs resistor to discharge the capacitor: https://www.tme.eu/lv/en/details/r50w-1k/power-resistors/sr-passives/ 4) 1 pcs relay to switch on discharge resistor: https://www.tme.eu/lv/en/details/gu-ss-124dfs/power-electromagnetic-relays/goodsky/ It seems that I will get those items only next week. I will report back when I have them all installed. Viesturs _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
