Hello,
Trying to set up a MRC II with sv3 for arc welding. Arcmaster 351 power source. Putting everything together. Robot runs but does not start arc. Wire feeder works (manually from pendant), all appropriate leds on interface come on ( arc on, purge, wire feed forward, etc.) but no arc. Display on arcmaster just stays a 000. I have an identical unit (with mrc and sk6) but same power source. On that one, the arcmaster also shows 000 until the mrc boots up, and then it show selected current. On the problem unit, it never changes from 000. I am guessing that I am missing some welder enable signal from the robot. I checked the cables out and they are fine. I also do not hear the gas valve come on. It seems that the robot is sending but the welder is not listening. Other that than that the robot works fine. Also, on the display screen, F5 is APL (which takes me to welder info such as tip time and cleaning) and no Diag soft key. I wanted to manually enable the purge output but could not get there. Any help would be appreciated.
Thanks in advance.
Jeff
MRC II APL not DIAG
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tiredold -
April 25, 2016 at 1:03 AM -
Thread is marked as Resolved.
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place the welder to the working robot and check if you have arc. then you will see if the problem comes from the robot or the welding machine
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I will try that as a last resort because they are located a different ends of the building, and run on different primary voltages. I was looking for something simple that I overlooked first. But thanks for the suggestion. It just seems that the robot is not putting the welder in a ready state. The lack of a DIAG soft key is an important indicator I think.
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LOL. I literally just found out how to get the DIAG button back. I have 2 MRC II SV3s. One has a DIAG button under DISP-F5, the other which I just initialized has an APL. All I did was create a job, insert a DOUT, then direct open on it. Voila! Now the APL button turned into a DIAG as it should.
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Hello,
Not quite sure what you meant by direct open. I wrote a program to turn on output 15, wait 2 sec. and turn output 15 off. DIAG did not show up. Also, I moved the robot over to the working welder and the symptoms are the same. Welder only displays 000, but when put back to other mrc, shows set valut 176. Any help would be greatly appreciated. I spoke to Motoman today and the said there is no signal from robot to welder to put it in ready state, but the analog signals may not be correct. He said probably a problem in the weld condition files. Still working on it.Further update, on the welder that works, terminal J5 pin 8 goes -5 volts on power up, on the welder that does not, this pin stays at 0 volts. On both pin 6 stays at 15 volts.
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Here you go...
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Thank you, it worked like a charm! I now have a DIAG button again.
Now back to the main problem. -5 volts on the pin 8 of terminal J5 is the key for the welder. I have duplicated welder condition and start files from the good to the bad and still no love. Pretty sure it is a setting somewhere.
I have also swapped out the interface boards, no change.
Once again, any help is greatly appreciated.
Jeff
According to the arcmaster book, that pin is (J) Remote Control Input (wiper of pot). but there is no pot, but the welder interface emulates one with a voltage output (-5 volts).Further update.
I tested the cable from the robot to the welder and it was fine, then I tested the end of the cable at the welder end, to the terminal strip on the weld interface board and guess what, severl lines were not there. I took the amp connector apart and found that six wires are not connected. The amp connectors are welder specific. I found one in my spares that had all the wires connected and tried it. The welder display went to 003 and the wire feeder ran very slow and backwards when I ran a welding program. Still no 5 volts on pin 8, but I am getting there. Had to leave right after that. Will try more tomorrow.