Debugging MPG

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15 Jan 2022 20:44 #231925 by kinghpole
Debugging MPG was created by kinghpole
I'm currently trying to set up a generic 4 axis mpg your find all over eBay I currently have it in a state of half working and not really sure how to de-bug it from here. The axis select works but when you spin the handwheel slowly it kind of moves the tenths place back and forth and only starts moving the machine at all when it is rapidly spun. Has anyone seen this behavior before or have any idea what's causing it?

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15 Jan 2022 20:57 #231928 by ALittleOffTheRails
Replied by ALittleOffTheRails on topic Debugging MPG
Going to need a bit more info.

Hardware being used eg mesa or parallel port or other (actual computer system isn't required). Your hal & ini files and a schematic of how you have wired the pendant.

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15 Jan 2022 21:28 - 15 Jan 2022 21:30 #231936 by kinghpole
Replied by kinghpole on topic Debugging MPG
The board it's wired into is a Mesa 7c80 with an RPI running linuxcnc. Here are the files and wiring diagram.
Attachments:
Last edit: 15 Jan 2022 21:30 by kinghpole.

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15 Jan 2022 21:43 #231939 by ALittleOffTheRails
Replied by ALittleOffTheRails on topic Debugging MPG
Are you sure the MPG, not the pendant as a whole, is a 24v device ? You may have to open the case and check the back of the MPG itself.

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15 Jan 2022 21:48 #231940 by kinghpole
Replied by kinghpole on topic Debugging MPG
I opened it up when I got it the mpg has 5-24v silk screened on the PCB.

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15 Jan 2022 22:58 - 15 Jan 2022 22:59 #231958 by ALittleOffTheRails
Replied by ALittleOffTheRails on topic Debugging MPG
What does it say on the actual MPG, not the PCB, but where the wires connect to the MPG.
Since you didn't provide a picture or link to your actual pendant I'm assuming it is similar to this type. If not you may have to provide some pictures.

 
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Last edit: 15 Jan 2022 22:59 by ALittleOffTheRails.

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15 Jan 2022 23:03 #231959 by kinghpole
Replied by kinghpole on topic Debugging MPG
This is the eBay link.
www.ebay.com/itm/174330977426

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15 Jan 2022 23:23 #231965 by ALittleOffTheRails
Replied by ALittleOffTheRails on topic Debugging MPG
If that is the actual one well it is a 5v mpg.

Like I said you will have to check on terminals of the MPG handwheel to correctly determine the voltage.

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15 Jan 2022 23:49 #231971 by kinghpole
Replied by kinghpole on topic Debugging MPG
I'll try sending 5v to it.

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16 Jan 2022 00:02 #231972 by ALittleOffTheRails
Replied by ALittleOffTheRails on topic Debugging MPG
You'll have to check what the 7c80 input values are. Which can be found in the 7c80 manual that is available the 7c80 product page.
www.mesanet.com/pdf/parallel/7c80man.pdf

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