Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Troncatore on July 06, 2011, 06:19:58 PM
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Hello to All
I'm Sorry But I'm having this problem...in one minute I'm registering two "E-StopRequested". The stranger is that checking the panel, as you can see, the emergency stop is not active!! Is a mystery for me!! I controlled several times ALL port and pins configuration without any anomalies…It is settled: ports1 pin 15 unchecked all the rest.
Best regards
Mauro
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Sounds like electrical noise, try increasing the debounce interval on General Config page
Hood
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Thanks Hood I'll let you know...!
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The real solution if it's electrical noise is to find the cause of the noise and remove it.
It's usually a bad ground, or multiple grounds that are the issue, though things like wrapping wires around power lines, or running them too close to the PSU.
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Hello ERP and Hood
I agree with you..but I was noticed about this problem just recently. I used this homemade electronic box for one mounth with another pc without problems. I'm using now also a power stabilizer...I'm intend to modify the wiring of my box using different cable&borns...For the moments ALL ok..I have just to refine the right debounce level. I'm using 2000 now!
Thanks for your helping
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Hello ERP and Hood
The debounce level is stable on 250...not bad I believe..don't you?
Best Regards
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Personally I prefer to not have any debounce set at all but as you say 250 is minimal so probably not worth looking for unless you find it gets worse through time and you have to increase.
Hood
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I agree with you Hood...but what can I do for eliminate the "noise"? Maybe using a shielded cable and born like the web plug…as I have seen on a site! What else?
Any suggestion is really welcomed
Thanks in advance..
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Shielding (with proper grounding) is always a good thing when talking about low voltage signal wiring. All of the signal wiring on my machines is 24v and only changed to 5v just before the breakout board although most of mine actually goes all the way at 24v into PLCs, servo drives etc. Adding small capacitors to the Input is also often used by people, all depends on your BOB and other setup.
Hood
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Hi Hood
Thanks a lot for your help...!
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Sorry Hood
When You say "proper grounding" what You mean? I'm using to graund ALL components togheter...starting from the box until the Mill ,,it is correct?
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There is a lot of different thoughts on grounding and which is the best method but most seem to agree that taking all the shield wires to a single point in your cabinet and grounding is the best method. It is known as star grounding as all wires radiate out like a star. Also only one end of the shield is normally grounded.
In the pic of the new control cabinet I am doing for my Bridgeport you will see arrowed the Ground/Earth connection that I run all my shields to (solder long wires to shield to run to the ground point). I dont have many wires shielded however, mainly just the high voltage ones as most of my signal wiring is 24v and 5v such as Step/Dir are differential so dont really need shielded.
Hood
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Oh another thing is I try to keep high and low voltage wiring as seperate as possible. Things such as power for the PLC is unavoidable but I have these power wires shielded.
Hood
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Whaooooooooooooooooooooo :o :o :o
Very impressive!!!!!!
A really nice work!!!
Thanks...
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Thanks for the compliment, I have done a few now and I learn each time I do one and manage to make improvements each time :)
Hood
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This is the right way!
I'm just starting. I modified my small Bf20 following my own mechanical project and assembled the electronic devices also my own...It seems I have to learn more!!!! :D :D :D..but I will!!!!
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I like learning and learn more every day, it will be a sad day when I stop learning and I hope I never reach the stage where I think I know it all ;)
Hood
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..Yes..I'ts right!!!! ;)
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Hi Hood
Please do you have more information about that?
"The charge pump signal is gated into
the buffer chips so that they are disabled without this signal present. This
means that driver boards that have no enable signal pins are still made safe by
having there input signals removed. This charge pump signal is also gated
into all relay outputs so no false triggering of the relays can occur while the
software is not running"
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When using the parallel port to control your machine a chargepump is often used as when windows is starting it can interrogate the parallel port and cause motion on your machine. Some breakout boards support the chargepump input and what it does is disable any outputs from the breakout board until it is getting a steady chargepump signal which means Mach is running.
Hood
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Ok..thanks I tought it was a possible help...Thanks anyway