Confusion over Ground, Earth and negative connections
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@jens55
Thanks for the help. I've mocked up this very crude diagram. The positions of cables don't correspond at all to where they really are, I just tried to keep things from looking too cluttered.The distro blocks are the "Wago" type, as can be seen in my first photo.
Does that makes sense?
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@threepwood, yes, that is how I would suggest to wire it
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@threepwood I don't think that's correct, you don't need to connect mains earth to your low voltage neutral block.
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@javajoeuk I've just about finished wiring everything up and now I'm not sure if I should switch it on...
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@javajoeuk Do you think it will cause any harm? Or do you think it is just unnecessary?
I'm leaning to the side of what @jens55 recommended, because I did previously have a ground loop issue with the USB being plugged in to the PC. The PC reported an overvoltage on USB and the ports stopped working until I restarted.
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The way i have done mine is mains to both the 5v and 24v transformers. 5v to my duet3 and 24v via an SSR to the duet . The mains earth does not get connected to anything other than the mains stuff not to your neutral block.
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@javajoeuk said in Confusion over Ground, Earth and negative connections:
@threepwood I don't think that's correct, you don't need to connect mains earth to your low voltage neutral block.
That's the topic of hot debate I eluded to in my earlier post. Some people feel it needs to be connected, other people feel that it should not be connected. Either way is fine and will not cause any issues.
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@jens55 I didnt want to frighten him about connecting mains earth the neutral in case of a ground fault on the mains side of things.
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@javajoeuk, fair enough but you could say that about anything connected to ground. It's just an additional safety.
Just an additional mention to the OP - if you are using an AC mains bed heater, don't forget to connect the bed to AC earth. Some people suggest to connect the frame to earth as well but I have never gone that far.
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Thanks everyone for your help. The printer is up and running and I have 5v running through the neopixel port.
@jens55 I have already connected the bed and frame to earth, but thanks for checking!
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@threepwood .... woooo hoooooo !
