Duet3MB6HC Start+EM stop wiring advice
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Hi,
RatRig Core-3 builds(two printers)
Duet3MB6HC main boards 1.01a
Pi4B 4GBLooking for advice, confirmation, of my electrical plan.
Will there be any ill effects from powering and depowering the Duet MB whilst the Pi is live(5vdc) (connected via supplied SPI cable, board 1.01a with only Int 5v option)Basically I am adding a Start & Emergency Stop buttons to my builds, but I don't want to damage the SD card/Pi firmware from sudden power offs. Therefore with my plan the buttons really start and stop the 24vdc supply and 230vac bed supply, the 5vdc supply the Raspberry Pi, power is controlled via main IEC14 plug switch.
I am also planning to add a secondary stacked switch to the start button to create a "pause/resume" switch. (later stage)
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(updated) I didn't like passing 230vac power to the front of the printer to switches, so I found another mains relay with a 6vdc coil (trips on 4.5vdc), Now I'm controlling the switching with low voltage, I think this option is safer and still functions.
Still asking Duet team for comments, specifically the SBC being powered connected via the default cable to an unpowered MB that is then powered up. Is this a problem?
