Plasma Cutter causes communications lost with 7176.
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24 Oct 2018 21:33 #119362
by tommylight
Replied by tommylight on topic Plasma Cutter causes communications lost with 7176.
Also powering the 5V side of the 7i76 with an USB cable plugged into the control computer is much better than having a separate power supply.
BTW, please do check the jumpers on the 5i25 and 7i76 that pertain to the 5V power, you might have them set wrong. This is just in case, to be sure.
Did you read the thread about plasma on this forum? I read everything on this forum so it is hard to keep up, in case you did not, please do, it will save you a lot of trouble.
Another thing to be wary of is the table, i always make the cutting table separate from the cnc part of the machine. Usually this is not a problem, but with some plasma power sources it is very important, several of them i have worked on have the grounding wire only to the case and that will mean that the table will be at a +100 to +200V potential.
BTW, please do check the jumpers on the 5i25 and 7i76 that pertain to the 5V power, you might have them set wrong. This is just in case, to be sure.
Did you read the thread about plasma on this forum? I read everything on this forum so it is hard to keep up, in case you did not, please do, it will save you a lot of trouble.
Another thing to be wary of is the table, i always make the cutting table separate from the cnc part of the machine. Usually this is not a problem, but with some plasma power sources it is very important, several of them i have worked on have the grounding wire only to the case and that will mean that the table will be at a +100 to +200V potential.
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24 Oct 2018 22:12 #119366
by skitter_ranch
Replied by skitter_ranch on topic Plasma Cutter causes communications lost with 7176.
Its all to ridiculous! I bought a new 5i25-7i76 because my old one lost their I/O. Now I have a new set of cards with I/O and I can't use them because they keep getting knocked out by the Cutter. $400 down the drain. I am no further ahead than I was a month ago. I will have to keep searching for a solution. At least now I know it's a transient issue. I might have to find some line reactors...or something.
thanks
thanks
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24 Oct 2018 22:36 #119369
by Grotius
Replied by Grotius on topic Plasma Cutter causes communications lost with 7176.
Hi,
Okey.
Move your pc and Control box and usb cables from the iron machine. Dont let one wire touch the machine.
If the machine is working good without
Plasma arc?
So yes.
Do a program and do the plasma torch contact extern. Torch normally open contact by hand.
If this is good.
You are almost where you want to be.
Try to find your disturbing source step
By step.
Good luck. Mesa can not do anything
About your problem.
Okey.
Move your pc and Control box and usb cables from the iron machine. Dont let one wire touch the machine.
If the machine is working good without
Plasma arc?
So yes.
Do a program and do the plasma torch contact extern. Torch normally open contact by hand.
If this is good.
You are almost where you want to be.
Try to find your disturbing source step
By step.
Good luck. Mesa can not do anything
About your problem.
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24 Oct 2018 22:53 #119372
by skitter_ranch
Replied by skitter_ranch on topic Plasma Cutter causes communications lost with 7176.
The machine works just fine UNTIL the trigger of the Cutter is set. I/O is no problem. Estop works, relay works.
As stated earlier, the Cutter was completely separated (the other side of the garage). NO physical connection. Only the same power line.
As stated earlier, the Cutter was completely separated (the other side of the garage). NO physical connection. Only the same power line.
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24 Oct 2018 22:55 #119373
by skitter_ranch
Replied by skitter_ranch on topic Plasma Cutter causes communications lost with 7176.
Oh, and I forgot, I have scanned through the Plasma files, but don't see anything relating to what I am experiencing. I will keep reading.
Thanks for your input.
Thanks for your input.
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24 Oct 2018 23:01 - 24 Oct 2018 23:02 #119374
by Grotius
Replied by Grotius on topic Plasma Cutter causes communications lost with 7176.
Disconnect plasma start. Do this by hand in running program. Is machine cutting without problems?
It can a problem in the inverter plasma start wiring
It can a problem in the inverter plasma start wiring
Last edit: 24 Oct 2018 23:02 by Grotius.
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25 Oct 2018 05:20 #119379
by tommylight
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25 Oct 2018 12:47 #119387
by rodw
Replied by rodw on topic Plasma Cutter causes communications lost with 7176.
Noise like this is certainly frustrating. I had similar issues with my 7i76e. Good grounding according to a Hypertherm document about a star ground was helpful and involved running a wire back to the star point from every stepper/servo motor.
I even purchased a USB oscilloscope to get a better handle on it all. One of the most effective things I did was replace the IEC power connector with an EMI filter like this. www.jaycar.com.au/iec-emi-power-line-filter-6-amp/p/MS4003
At one stage, I added a similar filter to the raw arc voltage in the plasma cutter itself. However, eventually I removed it and found it was not needed. In my case the noise was interfering with the arc voltage from the THCAD so it was impossible to do any THC adjustment.
The oscilloscope was useful as it helped me isolate the noise was coming from the control box, not the plasma cutter.
So welcome to the noobie plasma dance! I found there were so many things I had absolutely no clue about with electronics that is second nature to guys like PCW who are immersed in this stuff every day.
I even purchased a USB oscilloscope to get a better handle on it all. One of the most effective things I did was replace the IEC power connector with an EMI filter like this. www.jaycar.com.au/iec-emi-power-line-filter-6-amp/p/MS4003
At one stage, I added a similar filter to the raw arc voltage in the plasma cutter itself. However, eventually I removed it and found it was not needed. In my case the noise was interfering with the arc voltage from the THCAD so it was impossible to do any THC adjustment.
The oscilloscope was useful as it helped me isolate the noise was coming from the control box, not the plasma cutter.
So welcome to the noobie plasma dance! I found there were so many things I had absolutely no clue about with electronics that is second nature to guys like PCW who are immersed in this stuff every day.
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25 Oct 2018 14:08 #119392
by andypugh
Replied by andypugh on topic Plasma Cutter causes communications lost with 7176.
It sounds like it might be worth putting a noise filter in the plasma cutter power supply. eBay has many of them and they are fairly inexpensive.
As a random example (in the wrong country, probably)
www.ebay.co.uk/itm/250785925764
The bigger ones might filter better:
www.ebay.co.uk/itm/281951802860
Filters are often needed for VFDs because the inverter can send a lot of noise down the mains. A plasma cutter is a big inverter..
As a random example (in the wrong country, probably)
www.ebay.co.uk/itm/250785925764
The bigger ones might filter better:
www.ebay.co.uk/itm/281951802860
Filters are often needed for VFDs because the inverter can send a lot of noise down the mains. A plasma cutter is a big inverter..
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26 Oct 2018 13:03 #119443
by skitter_ranch
Replied by skitter_ranch on topic Plasma Cutter causes communications lost with 7176.
I have narrowed it down to a power line noise issue. I have already ordered a couple filters for my control circuits and computer. I am very familiar with the line transient issue, just did not think it would be the problem here. Step by step isolation of all the components including the gantry and table itself, an total removal of the plasma cutter is, to me, a clear indicator it is line noise.
I am even going one step further and get an input line reactor for the Plasma cutter. As this power line is also connect to all of my shop and ultimately my cottage electronics.
Line reactors are typically used in VFD applications with long leads to the motor, but there are three other applications of which this is two. But only one applies. Usually input reactors protect the power device (in this case the plasma cutter) from receiving line transients, but it can also stop the power device from introducing transients back into the supply lines.
Thanks for the feedback...pun intended!
I am even going one step further and get an input line reactor for the Plasma cutter. As this power line is also connect to all of my shop and ultimately my cottage electronics.
Line reactors are typically used in VFD applications with long leads to the motor, but there are three other applications of which this is two. But only one applies. Usually input reactors protect the power device (in this case the plasma cutter) from receiving line transients, but it can also stop the power device from introducing transients back into the supply lines.
Thanks for the feedback...pun intended!
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