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General Mach Discussion / Phantom Limit Switch

« on: March 17, 2016, 08:09:41 AM »

Breakout board is a parallel port board c10 is on it. No motion control, direct to PC.  We varied the debounce range from 1000-8000 because we could not successfully run the program more than two times in a row without the phantom limit switch. We then tried to isolate which limit switch that was creating the signal by turning off the pins in Mach3. However, it was sporadic on which one triggered it. The program runs when all of the limit switches are taken off. I also grounded all of the shielding from the input wires to try and eliminate any rogue signal from that.

We tested all of the motors and grounds for the machine which have continuity. We tried ceramic capacitors as per a suggestion which did not solve the issues. The CAP's are now removed. We are still experiencing a "limit switch triggered" almost half way through the program. We detached the proximity sensors from the machine and tried to run the program to see if vibrations were causing the limit switches to be triggered, it was not the case. The "limit switch triggered" message came up again during the process.

Machine is a Chinese KL-1212V with NEMA motors that we replaced. Purchased through Automation Technologies.  Wea re debating about swapping the VFD out with a machine that already works.

Please let us know if you have any ideas.

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General Mach Discussion / Reference Home Error

« on: February 10, 2016, 01:07:34 PM »

We unfortunately lost a colleague who was the brains behind all our automation in our district's technology education labs and need assistance.  We had a phantom limit switch triggered during our milling process and looked for information to fix this issues.  We went ahead and wired in ceramic caps where the inputs meet the BoB. 

The problem: The machine will not recognize the limit switches when we reference home.  They do not even illuminate when manually jogged to the/past the position.