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Author Topic: Random Estops occuring  (Read 2768 times)

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Random Estops occuring
« on: April 13, 2010, 08:16:18 PM »
Hi All,

Yesterday I started cutting a very large job. The machine ran for no less than 12 hours. Shortly before beginning and during the program cycle, the machine began to exhibit some rather odd behaviours. It would estop randomly. It seemed to happen about every 45 minutes to 80 minutes over the course of the entire job. None the less the job will have to be recut as this random behaviour has ruined the finished piece.  lookin' forward to that! especially when all these occurances make themselves known while attempting to meet a deadline.. Tell me how does that work?

The machine also estopped while performing a toolchange.
I've fiddled with all the limit switches thinking that perhaps they may be getting dirty. This happened once before and the remedy was a simple fix, but last time it was a solid estop from which I could not recover until the limit switch was inspected and "cleaned" I'm really not sure if it is the limit switch again or not. I'll have to go to the big W and get some 9 volts for  my voltmeter.. I'll have to check them and see for sure if they are full of sh*t or not.

During this time, as well, I was starting and stopping the run cycle and at on point the machine Estopped and an error message was readable . I wish I could recall the wording exactly, but it mentioned something about feed rate over ride... I'm feeling a little dumb for not remembering.. I am wondering if this is related to the random estop.

Ive looked for wiring issues IE interferance from electrical noise , but nothing has changed really so this does not make a whole lot of sense.

Up until yesterday there were no random estops occuring. It started quite abruptly.

So,
What would cause such occurrences? What can be done to rectify the situation.

Any suggestions or knowledge would be appreciated.


On a side note... Where is the best place on this www to begin the daunting task of learning how to create, design, program and install screen sets? I had some issues not long ago with my controller. I was greeted with a lovely BSOD one fine morning and since then Ive repaired the controller, had someone aid in the installation of the associated screen set and the machine was" mildly tuned" using  the latest lockdown version, but I am still having problems. I can no longer input figures into certain readouts in order to set axis offsets.
Anyway, all information is appreciated.

Thanks in advance.. MD. SWG&E

Re: Random Estops occuring
« Reply #1 on: April 14, 2010, 02:38:36 AM »
work your logic PLC with 24v is more sure and robust against noise

regards
Re: Random Estops occuring
« Reply #2 on: April 14, 2010, 02:37:39 PM »
i had a problem like this, and the cure was a bad earth connection. This was on a conversion, so the fault was there from the start.
Re: Random Estops occuring
« Reply #3 on: April 16, 2010, 07:37:06 AM »
I had Estops in the past. I just placed 100nF capacitors to all my inputs (limits, homes, estop) and the problem was solved!