Mesa 7i96 and LinuxCNC 2.8 PnCConf

tommylight
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09 Nov 2018 20:30 #120350 by tommylight

Replied by tommylight on topic Mesa 7i96 and LinuxCNC 2.8 PnCConf

Ya think !!!???

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Aldenflorio
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31 Aug 2020 18:03 #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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PCW
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31 Aug 2020 18:11 #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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Aldenflorio
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31 Aug 2020 18:13 - 31 Aug 2020 18:14 #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

Last edit: 31 Aug 2020 18:14 by Aldenflorio.

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PCW
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31 Aug 2020 20:05 #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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Aldenflorio
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31 Aug 2020 20:30 #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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PCW
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31 Aug 2020 20:45 #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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Aldenflorio
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31 Aug 2020 20:47 - 31 Aug 2020 20:47 #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-

Last edit: 31 Aug 2020 20:47 by Aldenflorio.

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PCW
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31 Aug 2020 20:54 #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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Aldenflorio
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31 Aug 2020 20:55 - 31 Aug 2020 20:56 #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?

Last edit: 31 Aug 2020 20:56 by Aldenflorio.

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