Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: aquatix on November 13, 2008, 10:12:15 AM
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Hello everyone!
Greetings from Greece.
I have been a new Syil X4 plus mill and I control it with mach3
I have a little problem.
Randomly when I press to cycle start button it will generate a e-stop requested error.
90% percent of the times I press cycle start it will work and start the operation . But every now and then it will generate the e-stop.
Any ideas on what to look for??
Thank you.
Lefteris
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Is it an external start button? Is there a message in the ticker box at the bottom of the Mach screen? Could be noise getting picked up with the spindle starting, to test this out go to config menu then general config and set the debounce to 2000. If that cures it then keep lowering the debounce until you get the problem again and then step up a notch.
Hood
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Hood, thank you for your reply.
No I use the cycle start button,
There is a message it says external e -stop requested.
Should I still l try the debounce setting then?
Lefteris
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Yes still try the debounce as it could be noise getting into your limits. If debounce works then it might be best to sort out the problem rather than to use the debounce as a fix. Not sure how your limits are connected but you should be using shielded cable for them and only have the shielding connected at the control cabinet end and all shielding should be grounded at one point only.
Hood
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FWIW, setting the debounce up makes my RPM reading completely inaccurate. I suppose the index signal has a problem with debounce.
I was getting random e-stops also and it drove me crazy for a while. It was metal chips getting on the exposed limit switch terminals. Covered them with heat shrink . . end of problem.
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Simpson
that is because you increased the Index debounce ;)
Hood
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Hood,
You didn't make that distinction in your post.
However, I mis-spoke. I didn't actually set the debouce up, I ran into the problem when I was playing around with MachTurn. The debounce was set to whatever the default is, I suppose, because I had never messed withit in MILL or in TURN.
I just noticed that the RPM would read to 350 and go no higher in TURN, yet it looked accurate in MILL, so I started comparing and experimenting. I just set both boxes to zero in TURN, and the RPM DRO started working right.
Thanks for the heads up, though. I'll see what I can find in the docs about the different debounce settings.
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Hood,
You didn't make that distinction in your post.
I did, well sort of ;D One is called Debounce Interval , the other is called Index debounce. The Debounce Interval is for limit switches and general inputs where the Index Debounce is specifically for the Index pulse. Index Debounce should be kept as low as possible and I think much over 10 means you have serious issues anyway.
Hood
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Ok a new clue in the process.
The same thing happens when I manually start the spindle from the button on the actual machine.
So I guess it has to do with the mill.
I want to see if same thing happens if I start with lower RPM and then speed up to the desired RPM.
Or if need a ac voltage stabilizer. Because I think it drops the current instantly and then e-stops.
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Have you tried increasing the debounce interval?
Hood
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From the "stab in the dark" department;
I just started a thread on grounding that you may want to follow. Grounding and also shielding are apparently serious considerations in CNC.
One example in my experience was the Z axis motor randomly bumping a step while it was stopped. It was located adjacent to the variable speed controller which was in the original plastic box. After reading that these controllers can be very noisy electrically, I moved the controller and associated switches and relays into a separate metal box located off the machine. All that goes to the spindle is the 120v dc power feed from the controller box.
So far, that seems to have cured that problem.
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could be earth leakage, that held me up for a while. It takes very little current to ground a pin. Use a seperate supply like a 'phone charger, feeding your estop and limits, and use it to hold a relay closed. Wire the relay contacts to your logic pins.