Mesa 7i96 and LinuxCNC 2.8 PnCConf

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7 years 11 months ago #120350 by tommylight
Replied by tommylight on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
Ya think !!!??? :)

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6 years 2 months ago #180203 by Aldenflorio
Replied by Aldenflorio on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
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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6 years 2 months ago #180205 by PCW
Replied by PCW on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
The inputs LEDS would be on if you have NC limit switches
(and go off when tripped)

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6 years 2 months ago #180206 by Aldenflorio
Replied by Aldenflorio on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
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

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6 years 1 month ago #180215 by PCW
Replied by PCW on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
what is the input common connected to?

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

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6 years 1 month ago #180221 by Aldenflorio
Replied by Aldenflorio on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
The common is connected to the V-

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6 years 1 month ago #180226 by PCW
Replied by PCW on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
is V- connected to frame ground?

It really sounds like some kind of wiring error

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6 years 1 month ago #180227 by Aldenflorio
Replied by Aldenflorio on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
No v- isn’t. It goes from v+ to limit switch, other wire from limit switch to input on Mesa. Then com is v-

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6 years 1 month ago #180229 by PCW
Replied by PCW on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
My guess would be that you have a large AC (maybe HF)
voltage from V- to frame ground.

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6 years 1 month ago #180230 by Aldenflorio
Replied by Aldenflorio on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf
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?

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