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Limit / Home Switches
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Topic: Limit / Home Switches (Read 10784 times)
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booda88
7
Limit / Home Switches
«
on:
October 04, 2013, 09:33:25 PM »
I switched over to servos from stepper motors and the axis will not back off the limit switches. The breakout board is a CNC4PC-C11, with Geckodriver G320X and a KL34-180-72 servo motor. All limit and encoder wires are shielded.
When the axis go to the limit it stops but can not move it off the limit switch. Any ideas. HELP
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rickinbeachcrest
32
Re: Limit / Home Switches
«
Reply #1 on:
October 06, 2013, 12:43:10 AM »
There is an override button that will allow you to move off the limit switch. I've only used it once or twice so I don't remember the details. I think it is mentioned in the Homing, limits and offsets video.
http://www.machsupport.com/videos/
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Hood
25,835
Carnoustie, Scotland
Re: Limit / Home Switches
«
Reply #2 on:
October 06, 2013, 04:21:54 AM »
Are you meaning when you are homing it hits the switch but then an E-Stop is called because the switch is then seen as a limit rather than a home?
If that is the case then it is one of two things, you have noise or you have bouncing switches. Both can be helped by setting a Debounce Interval in General Config page but really you shouldnt have to do that if you have the wiring properly shielded and grounded.
If you attach your xml and I will look to see if your config is correct.
Hood
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booda88
7
Re: Limit / Home Switches
«
Reply #3 on:
October 06, 2013, 06:07:07 AM »
I have the Debounce Interval set at 2000 and it still will not work the wiring is shielded on both the limit switches and the encoders. I will get the iml and post it if I can.Thank you for your help
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ger21
6,295
Re: Limit / Home Switches
«
Reply #4 on:
October 06, 2013, 07:07:30 AM »
2000is actually rather low. Try setting it at 10,000 and see if it helps.
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Gerry
2010 Screenset
http://www.thecncwoodworker.com/2010.html
JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Hood
25,835
Carnoustie, Scotland
Re: Limit / Home Switches
«
Reply #5 on:
October 06, 2013, 07:37:13 AM »
Have you got the shielding connected to one single point? Is the shielding only connected at one end of the cable.
Regarding 2000 being a low setting, it depends on your perspective, anything other than Zero is a high setting in my opinion :-)
Hood
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booda88
7
Re: Limit / Home Switches
«
Reply #6 on:
October 06, 2013, 07:51:34 AM »
Connected to the ground on the C11 break-out board on the limit switches
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Hood
25,835
Carnoustie, Scotland
Re: Limit / Home Switches
«
Reply #7 on:
October 06, 2013, 07:54:45 AM »
I do not know anything about the C11 but normal practice is to connect shields to a single stud in your control cabinet and that stud also be connected to Earth.
Hood
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booda88
7
Re: Limit / Home Switches
«
Reply #8 on:
October 06, 2013, 07:55:27 AM »
I will move it Thanks
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Hood
25,835
Carnoustie, Scotland
Re: Limit / Home Switches
«
Reply #9 on:
October 06, 2013, 07:56:31 AM »
Just a thought, are you using the shield as a conductor?
In other words are you using the shield for your 0v for your circuit?
Hood
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