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Author Topic: e stop requested ?  (Read 2603 times)

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Offline coop

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e stop requested ?
« on: October 15, 2009, 09:16:39 AM »
hello everyone !
i have a k2cnc 50 x 50 with rack and pinion..
it has run great for 6 months now, no complaints, but
here is the problem...
now i get annoying Estop requested stops at random spots during a cut !
the files i use have ben used 50 + times over and over so they are fine,
when trying to salvage the piece or recover i have gone back to zero and rewound and restarted etc.
but still get the stop in different places !
i am relativley familar with electrical noise as this is my second machine.
are there other things that would cause the stop like motor tuning, steps etc. ?
is e stop requested completley diff than e stop pressed ?
help me !
bo

Offline Jeff_Birt

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Re: e stop requested ?
« Reply #1 on: October 15, 2009, 09:24:50 AM »
'E-Stop Requested' means that an external input to Mach, set up in Ports&Pins as the E-Stop input, triggered the E-Stop condition. If you press the button on Mach's screen then you get an 'E-Stop Pressed'.

Your problem is NOISE, you can try setting a debounce value in Ports&Pins to see if that helps. Something on the order of 100ms should be plenty. It could also be that you will need to track down the source of the noise to solve the problem.
Happy machining , Jeff Birt
 

Offline coop

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Re: e stop requested ?
« Reply #2 on: October 15, 2009, 09:29:05 AM »
thanks jeff,
the puzzeling part is ,why would it start now /
after running great for a time ?
nothing has changed physically !
bo
Re: e stop requested ?
« Reply #3 on: October 15, 2009, 10:33:15 AM »
Hello Bo,
   If you have mechanical limit switches wired NC and they are not totally sealed, they can become intermittent over time .... especially in a dusty environment. Any brief opening of the circuit due to vibration or sudden axis moves can trigger the E-Stop.
Had this happen once.....after several months of running perfectly.
Like Jeff said, the debounce might correct it...temporarily ...but best to find and fix the problem.
Welcome to the forum,
RC

Offline coop

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Re: e stop requested ?
« Reply #4 on: October 15, 2009, 10:44:30 AM »
i do have mech home switches
but the dust is minimal !
my movements have become slightly rougher
on one of the axis though (rack and pinion)
this has concerned me
my first machine is all ball screws and smooth as can be
but the new machine has rack and pinion on the x/y axis ans has never seemed quite as smooth as the other machine ..is this normal ?
bo