Hello,
I made a surprising discovery. If I removed the KXA motor control from the frame (so it is not grounded) the control voltage comes right up! Somehow the control voltage to the welder is grounded out through the speed control. Would anyone have any ideas?
Thanks in advance
Further to How to adjust voltage from UWI to welder
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tiredold -
May 3, 2016 at 9:00 AM -
Thread is marked as Resolved.
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The tach on the motor is grounding and causing all your problems. You will have to replace it with a new welder seeing how the PWF stuff was discontinued in 2000.
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Success!! sort of.
By isolating the KXA I got the welder up an running. But at too high a voltage, and I could not drop it down by programming different weld files or direct arcvol and arccur commands. I did some more research and found pot 1 on the UWI that is used to scale voltage control output. I thought that although the swapped boards worked the same, they are all set the same welder, but not for the same control (MRC vs MRCII). By adjusting this pot I changed the welder display from 453 to 175 (the same as the other working welder). Sure enough it makes beautiful welds that can be controlled by the arc commands. The KXA "grounds" out even with the wire feeder disconnected. So I doubt the tach is grounding out. However, the voltage control is grounding out somewhere, that is why the KXA case when grounded takes the control voltage to 0. Now that I know that the robot will weld I can continue on making the machine ( an automated pipe splicer). I will tackle the KXA grounding later. Swapping the KXA made no difference, thus there is a wiring issue somewhere inside the control that I will find later. Like my orthopedic surgeon said in the middle of a one of my 12 surgeries "the enemy of good is better". Sometimes you just have to take 80% instead of losing it all trying for 90 or 100%.Thanks again for all your help. I hope to return the favor one day.