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I have a Lincoln SP-125 (just picked up used) that is now not feeding wire. The unit turns on, fan starts, and when you pull the trigger you hear a click as if it wants to feed, but nothing. I checked the poles on the drive motor and it does not appear that there is any voltage...Ideas?Thanks,
Reply:Do the feed rolls work. JohnSMAW,GMAW,FCAW,GTAW,SAW,PAC/PAW/OFCand Shielding Gases. There all here. :
Reply:The tension on the roll has to be loose, the inlet and outlet guides to the feed rolls have to be in line, the liner has to be the correct size and clean, the contact tip has to be the correct size and in good shape. Some of the things to look for except the machine. JohnSMAW,GMAW,FCAW,GTAW,SAW,PAC/PAW/OFCand Shielding Gases. There all here. :
Reply:no voltage at motor? measure voltage from your gun to ground lead. Might have to dig up a schematic for the machine.
Reply:I get no voltage on the poles (ground - gun).- Unit turns on- Pulling trigger activates a "click" - as if it was going to feedAt this point I am just trying to get the motor to turn... Originally Posted by slamdvwno voltage at motor? measure voltage from your gun to ground lead. Might have to dig up a schematic for the machine.
Reply:Nope! Originally Posted by weldgaultDo the feed rolls work. John
Reply:Did you try to unplug the gun leads under the cover, and briefly connect the terminals with some rubber handled needle nose? This will help isolate the trigger or something inside the box as being at fault. But when mine had problems, it wasn't making a click at all. I jumped the gun contacts, then it started working again. The click makes me think it isn't the trigger. If you haven't already tried, you might make sure you can loosen the feed rollers and pull wire through the tip freely.
Reply:I will give it a try - but the clicking... Originally Posted by JamesBrauer66Did you try to unplug the gun leads under the cover, and briefly connect the terminals with some rubber handled needle nose? This will help isolate the trigger or something inside the box as being at fault. But when mine had problems, it wasn't making a click at all. I jumped the gun contacts, then it started working again. The click makes me think it isn't the trigger. If you haven't already tried, you might make sure you can loosen the feed rollers and pull wire through the tip freely.
Reply:Nothing... Originally Posted by welder76000I will give it a try - but the clicking...
Reply:Can you tell what is clicking? Is it just the gas solenoid or is it also the contactor? What about voltage on the power leads (The positive and negative terminals that go to the work and gun). Do you get voltage at those when you trigger the gun? If you do get welding voltage, then your motor speed control circuit might be cooked (or disconnected.) If your handy and safe with the multimeter, check the input and output voltage of the motor speed control, just to verify juice is going in and out. Of course, be safe and use a schematic to track down where the break in the motor circuit is.If you don't get welding voltage at the terminals when you press the switch, then, if your motor speed circuit draws current from welding power, your contactor may be faulty (Probably not, contactors are usually pretty robust, and tend to last a long time.)Keep us posted and be safe (especially around any large capacitors!)cricman
Reply:What is clicking? Not sure, is sounds like a magnet hitting metal - it is the normal sound created by the trigger, I think.No matter what I do I don't seem to be able to pickup any voltage on the positive pole coming from the capacitor when I strike the trigger. I will look for the motor speed control...Thanks again Originally Posted by cricmanCan you tell what is clicking? Is it just the gas solenoid or is it also the contactor? What about voltage on the power leads (The positive and negative terminals that go to the work and gun). Do you get voltage at those when you trigger the gun? If you do get welding voltage, then your motor speed control circuit might be cooked (or disconnected.) If your handy and safe with the multimeter, check the input and output voltage of the motor speed control, just to verify juice is going in and out. Of course, be safe and use a schematic to track down where the break in the motor circuit is.If you don't get welding voltage at the terminals when you press the switch, then, if your motor speed circuit draws current from welding power, your contactor may be faulty (Probably not, contactors are usually pretty robust, and tend to last a long time.)Keep us posted and be safe (especially around any large capacitors!)cricman
Reply:Here is a site for troubleshooting info on the 125...http://content.lincolnelectric.com/p...r/im/IM536.pdf
Reply:Thank you, first place I started! Been living and breathing it.... Originally Posted by WeldordieHere is a site for troubleshooting info on the 125...http://content.lincolnelectric.com/p...r/im/IM536.pdf
Reply:Some similiar problems with my Lincoln 180. First problem was that the wire guide (little groved wheel in feed mechaism) had separated. It's actually two peices pressed together and it delaminated, allowing the wire to slide so far it that the drive wheel did not grip it. Dealer provided new, redesigned wheel, problem has not reoccurred. Second feed problem was something between the motor and the wire drive. Drive was slipping, finally got to where it would not drive enough load to move wire. This was a major repair, but Lincoln fixed under warranty.
Reply:Interesting, the drive issue sounds possible. I have been using the multimeter all over the place but the drive motor is in a very precarious position.I am starting to think that my issues might be related to a bad rectifier or diode. While I get power off of the board, I do not see power on one bank of the rectifier. Originally Posted by JimmyboySome similiar problems with my Lincoln 180. First problem was that the wire guide (little groved wheel in feed mechaism) had separated. It's actually two peices pressed together and it delaminated, allowing the wire to slide so far it that the drive wheel did not grip it. Dealer provided new, redesigned wheel, problem has not reoccurred. Second feed problem was something between the motor and the wire drive. Drive was slipping, finally got to where it would not drive enough load to move wire. This was a major repair, but Lincoln fixed under warranty.
Reply:I think you are right, the clicking might be the gas solenoid. Originally Posted by cricmanCan you tell what is clicking? Is it just the gas solenoid or is it also the contactor? What about voltage on the power leads (The positive and negative terminals that go to the work and gun). Do you get voltage at those when you trigger the gun? If you do get welding voltage, then your motor speed control circuit might be cooked (or disconnected.) If your handy and safe with the multimeter, check the input and output voltage of the motor speed control, just to verify juice is going in and out. Of course, be safe and use a schematic to track down where the break in the motor circuit is.If you don't get welding voltage at the terminals when you press the switch, then, if your motor speed circuit draws current from welding power, your contactor may be faulty (Probably not, contactors are usually pretty robust, and tend to last a long time.)Keep us posted and be safe (especially around any large capacitors!)cricman
Reply:Does your 125 have a built-in circuit breaker?
Reply:Yes it does. It appears to be working - tested the unit without it. Originally Posted by WeldordieDoes your 125 have a built-in circuit breaker?
Reply:Update:I have tested the diodes, and a couple look a little fishy. I started a new thread in Electrical http://www.weldingweb.com/vbb/showthread.php?t=15624 for good measure. (or rather it was moved!)I am still not sure why this would cause the feed motor to stop working...
Reply:Originally Posted by welder76000Update:...I am still not sure why this would cause the feed motor to stop working...
Reply:BobI can't thank you enough for your post. You just solved my problem with my SP-135. As a "recreational welder" I do not weld too often, and the last time I used my welder it was on thin stock, and now I am welding some 1/2" material. Before I turned the machine on, I selected a higher setting and feed rate, and when all set up ready to weld, I went to feed some wire and nothing came out. At first I thought the wire was stuck, as the contactor sounded normal but wire would not feed. After verifying the wire was free, and the drive roller was not turning, I checked for voltage at the motor and there was nothing.After spend several minutes scratching my head, and other parts, I came in the house and went on line looking for a Lincoln repair dealer, thinking I would have to replace the the contactor (perhaps it had bad contacts)Then I found this wonderful forum, and after a brief search, I found BOB, and the correct solution to my problem.Bob you are my new hero, and I will name a tool in my shop after you........ thank you so much for saving me hours of grief and untold $$$$$ in replacement parts that wern't needed.I will be back to read more on this forum, as there were several other articles that struck my interest, but right now I need to go put my welder back together again and fininsh welding up my quick release saddle bag brackets I am building.BTW, I love this welder...... and this is the first issue I have had with it in over 15 yearsthanks again and Happy New Year to all,mikee
Reply:Hi mikee, I'm glad you found that post useful. One thing I should have mentioned is that just moving the voltage selector switch up and down the range several times is often enough to wipe the contacts clean and restore output and wire feed.Good luck,Bob
Reply:Bob:Your post helped me to identify at least one problem on a SP 135T that I am repairing for a friend. The voltage selector switch is cracked (plastic) and not making contact. Any advice as to the best place to buy parts online?Thank you!Jesse BaldwinOwnerBaldwin Industrial GroupCA C-10 License #925362www.BaldwinIndustrialGroup.comPh. (760) 914-245553 South Landing RoadCrowley Lake, CA 93546
Reply:I really don't think Bob is on here anymore, or that you will hear from him!His last post on this site was way back on 03-23-2008, 10:00 AM.#1. If you don't like what I wrote, or if it offends you, then don't read it!#2. I am living life the way I see fit, if you don't like the way I'M living, tough sh**!
Reply:Hope that you are wrong. His advice was spot on. mike |
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发表于 2021-8-31 22:21:32