Mesa 7i96 and LinuxCNC 2.8 PnCConf

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09 Nov 2018 20:30 #120350 by tommylight
Ya think !!!??? :)
The following user(s) said Thank You: snugglylovemuffin

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31 Aug 2020 18:03 #180203 by Aldenflorio
I know this is an old topic but I’m having similar issues I think. All the limit switches on the inputs are lit up yellow. I used shielded wire and grounded them but now they are just brighter.

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31 Aug 2020 18:11 #180205 by PCW
The inputs LEDS would be on if you have NC limit switches
(and go off when tripped)

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31 Aug 2020 18:13 - 31 Aug 2020 18:14 #180206 by Aldenflorio
Yeah, but they are NO and are all lit. When I manually push one then the others get darker and that one gets brighter. I think it sounds like a electrical noise issue but the wires are grounded
Last edit: 31 Aug 2020 18:14 by Aldenflorio.

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31 Aug 2020 20:05 #180215 by PCW
what is the input common connected to?

Sounds more like a wiring error of some kind
(missing common connection?)

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31 Aug 2020 20:30 #180221 by Aldenflorio
The common is connected to the V-

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31 Aug 2020 20:45 #180226 by PCW
is V- connected to frame ground?

It really sounds like some kind of wiring error

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31 Aug 2020 20:47 - 31 Aug 2020 20:47 #180227 by Aldenflorio
No v- isn’t. It goes from v+ to limit switch, other wire from limit switch to input on Mesa. Then com is v-
Last edit: 31 Aug 2020 20:47 by Aldenflorio.

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31 Aug 2020 20:54 #180229 by PCW
My guess would be that you have a large AC (maybe HF)
voltage from V- to frame ground.

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31 Aug 2020 20:55 - 31 Aug 2020 20:56 #180230 by Aldenflorio
I’m not sure. I’m going to make a larger control box and see if that helps. Things are a bit close. But is the wiring right with what I said?
Last edit: 31 Aug 2020 20:56 by Aldenflorio.

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