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Author Topic: Random E-stop and limit alarms -Software or relay board related?  (Read 3495 times)

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Random E-stop and limit alarms -Software or relay board related?
« on: November 20, 2007, 11:12:59 PM »
Last winter I started conversion of an older mill/drill to a 3 axis stepper driven CNC. I got the mechanicals done, ballscrews, motors mounted etc. then covered it up and went on with my regular work. A couple of weeks ago I downloaded the Mach3 trial software and started building the control using Gecko 203Vs, an older Hubbard CNC (Ebay) breakout board, a Hubbard Limit switch board, Kelling 70VDC power supply, and the usual bells and whistles.

Once I got it all wired and powered up I started having random E-stop and limit switch errors pop up in Mach3, requiring a reset.  Usually it happens when nothing is moving at all.  Occasionally I will see a quick flash on the pin designators on the diagnostics page just before the e-stop alarm starts again (when nothing is moving). I have been in touch with Brent Hubbard and he very graciously sent me a new generation relay board even exchange for the one I purchased last year. The new model appears to have been designed with mach3 and gecko drives in mind as both are mentioned in the set-up instructions.  I installed it this morning and the problem with the estop errors has slowed down to once every couple of minutes with nothing moving but has not completely gone away.

I am running 4.3A NEMA42 625 oz/in motors on X&Y and a 4A NEMA34 465oz/in motor on Z. I am wondering if I have somthing set incorrectly in Mach3 where there is some kind of feedback occuring which causes the estop/limit alarm to kick in.  I have jogged the axis many times and the problem usually occurs during motor start-up or slowing while moving, but sometimes the alarm goes off whrn nothing is moving at all. 

Is there some setting in Mach3 that I could have set wrong?

Thanks in advance -Mike

Offline Chip

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Re: Random E-stop and limit alarms -Software or relay board related?
« Reply #1 on: November 20, 2007, 11:48:30 PM »
Hi, Mike

Set your Debounce Interval to 2000. In Config, General Configuration page.

If that doesn't help, Some have put a Capacitor across there limit switch's, I think .01 cap's.

Hope this Helps, Chip

Offline mark4

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Re: Random E-stop and limit alarms -Software or relay board related?
« Reply #2 on: May 05, 2011, 09:44:58 PM »
hi i have gonethrough this a few times so far and the capacitors you want to use are .1 mfd not .01 made that mistake myself now i have tones of .01 i cant use oh well