Welder problems
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=183385
Printed Date: 29 Apr 2024 at 4:11am
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Topic: Welder problems
Posted By: TMiller/NC
Subject: Welder problems
Date Posted: 21 Sep 2021 at 8:03pm
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I have a Millermatic 175 wire feed welder that feeds gas as soon as power switch is turned on, only should feed gas when trigger is pulled, wire does not feed until trigger is pulled. Checked leads on gas valve coil and has 240 volts as soon as power switch is turned on. Anyone have experience with this problem?????? |
Replies:
Posted By: dee_veloper
Date Posted: 21 Sep 2021 at 8:21pm
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You may also want to take that specific type of question to a Miller forum. https://forum.millerwelds.com/forum/welding-discussions" rel="nofollow - https://forum.millerwelds.com/forum/welding-discussions ------------- Don't confuse my personality with my attitude. My personality is who I am. My attitude depends on who you are. |
Posted By: steve(ill)
Date Posted: 21 Sep 2021 at 8:31pm
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Tim... i believe the unit has a control board... Power goes into the board.... control switch feeds into the board.. output is to the wire feeder... another output is to the gas valve.. If all this is correct, you might have a control board problem.. Look at the gas valve wires and see if they both run to a circuit / control board... If yes, the BRAIN is on the board.  ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 21 Sep 2021 at 8:35pm
closeup ............. gun trigger shows 2 wires... dont know if that is two switches ( one failed ??) .... or if two leads for one circuit ?? ------------- Like them all, but love the "B"s. |
Posted By: TMiller/NC
Date Posted: 21 Sep 2021 at 8:50pm
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Steve, the wires for gas valve do come from control board, I've looked the board for discolored or burn mark finding none. Thinking of installing a relay with 24v coil using wire from gun trigger and a common and breaking the gas valve circuit with the contacts. Thanks for the response.
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Posted By: steve(ill)
Date Posted: 21 Sep 2021 at 9:44pm
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that would work... the only other question is the gun trigger... is it actually TWO switches, one for the wire and one for the gas... ? You might unplug ONE of the wires at a time and see if the other wire actually controls something...... what if it is two switches and one is STUCK ON causing the gas valve to say open ? ------------- Like them all, but love the "B"s. |
Posted By: DMiller
Date Posted: 22 Sep 2021 at 5:01am
| Relay will not work to replace the Card if that is bad, will close on first impulse and lock in just as the card did. Buddy of mine tried similar, and ended up almost cooking his welder. |
Posted By: steve(ill)
Date Posted: 22 Sep 2021 at 8:57am
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he is thinking of using the GUN SWITCH as a trigger for the solenoid.. It would then be an ON- OFF controlled by the trigger, not the board. ------------- Like them all, but love the "B"s. |
Posted By: TMiller/NC
Date Posted: 22 Sep 2021 at 4:16pm
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Update.............. After messing with it for sometime decided to re install board hooked everything back as should be, gave it a try, works as it should. I think relay contacts are sticking, if I can determine which one will try changing it. Miller isn't very forth coming with diagrams. Thanks for the response! |
Posted By: Ken(MI)
Date Posted: 22 Sep 2021 at 4:43pm
| Gas valve is probably sticking, usually the case with those little Millers, never had a problem with the electronics in that respect. |
Posted By: jaybmiller
Date Posted: 22 Sep 2021 at 5:53pm
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re: relays... if possible find who actually made them, cross ref for ones with gold plated contactc, even better gold/palladium (?). Be nice to find a true 'sealed' relay, retorofit to SSR even better. ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: DaveKamp
Date Posted: 27 Sep 2021 at 9:18pm
If you haven't found the proper diagram, it is NOT because Miller is hesitant to provide diagrams. You can get diagrams for basically ANY Miller product, EVEN ones that predate 1970, simply by sending an Email and asking... But search their document system FIRST, because they publish them in convenient PDF format. I've used their site literally THOUSANDS of times in my 3-phase to single-phase conversion series... they're unmatched by ANY in the industry for document support. I second Ken's assessment- it is more likely that the gas valve got a little bit contaminated, and it managed to free itself. It is NOT a high pressure valve, nor is it a very powerful electromagnet. A little contamination will prevent the cutoff needle from seating... a few cycles of the gun frequently knocks it clear. ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
TMiller/NC wrote: