Autolynx 160 not welding right, problem controlling voltage, so they say?

  1. Cuma Member

    Messages:
    46
    Location:
    teeside
    Got a murex autolynx 160mk2 and it isn't welding right. melts the wire but beads it all ontop of th steel without any real penetration. at first thought it may be capacitors, of which it has two big 250000 oil filled electrolytics. well ive actually tested the caps tonight and with multimeter set to 2000 ohms, the caps, both of them respond like I was advised they would if they were good caps, ramping up, switch the leads, ramping down.
    I have found out something from the seller of this Murex today that he had the machine looked at before giving me it (could have told me earlier) and the engineer told him its got problems controlling voltage CV and the wire feed motor isnt working right. But the motor sounds fine to me and pushes wire fine. ramps up its speed if I turn the dial and vice versa? Also didn't understqand how he stated it had problem controlling voltage. I have tested and have proper voltages measured at the tip from my meter with trigger pulled. I thought with amps that the wire feed side controlled this and this also being where a mig gets its heat/penetration from was the machines ability to control the amps relative to the arc length it monitors and the wire feed setting.
    Some to summerise my two caps are fine and im now looking within the wire feed and also towards measuring the machines amperage delivery at the tip when welding.... I don't have a DC amp meter at present though.
    CAN ANYONE ADVISE OR ADD TO THIS WHO HAS MORE EXPERIENCE......
     
  2. NotANormalCoder Retired fixer of welders

    Messages:
    313
    Location:
    Surbiton - Surrey -UK
    Issues with the SCR assembly at the rear of the machine, or the PCB that supplies the signals to it, are most likely causes. I have private messaged you my email address, so you can send me yours and I'll send diagrams to you.
    Dave
     
  3. Cuma Member

    Messages:
    46
    Location:
    teeside
    I didn't get a private message bt my email is bespokesapwood@gmail.com if you have those diagrams for this autolynx 160.
    What is the SCR assembly?
     
  4. NotANormalCoder Retired fixer of welders

    Messages:
    313
    Location:
    Surbiton - Surrey -UK
    I have sent you an email! Dave
     
  5. brokendown New Member

    Messages:
    2
    Location:
    birmingham
    I have a problem with my autolynx, I can not get it to arch, i have power down the torch and the wire is feeding ,but it doesn't arch
    any ideas ?
     
  6. Cuma Member

    Messages:
    46
    Location:
    teeside
    open up all your panels so you have good access to the machine. check your ground connection from clamp right thru the machine. use a mutimeter to check its continuity. these are terrible for bad connections these old things. spade connections rattling loose and falling off etc. plus solder joints on the pcb boards going dry and breaking contact.
    also if you have good round you will be able to check for voltage between clamp nd gun tip with the meter set to DC volts, if you get between 15vdc upto 40vdc from low to high setting when pulling the trigger then your round is fine, this test will save you messing on with what I said above if your competent with a meter ad can do this.
     
  7. Cuma Member

    Messages:
    46
    Location:
    teeside
    so today ive bee right thru this machine and checked all connection and tested the three capacitors with a meter. crude test I know but ive only got a multimeter and not a caps tester. the caps look good, the rubber pressure release pplug on each cap is ok, no bulging, they have a tiny bit of oil staining around the top seal, but nothing major. Ive not yet got round to ssetting it up with wire and testing it welding, but I will do in morning.
    Just want to inform you of some of my findings. all the capacitor spade connectors were very loose and dusty, crumby and dry. so ive rubbed the with some fine sandpaper and sprayed them with light machine oil. ive put new spade connectors on all the wires.
    Next I noticed all the pots for selecting wire speed, power setting and the two stitch weld settings, they were all shot to ****. either very very loose feeling or stiff and difficult. non inspire much confidence.
    I hadn't took and pcb boards out to check for dry solder joints. That's my next step if in the morning she doesn't boot into life..
    So anyway, not a lot that made me worry besides the capacitor spade connectors. all the wiring is good, all cable bolts are on good...
    ive included more pics if anyone can point out the uses and purposes of the various pcb boards on this machine..
    WP_20171203_003.jpg WP_20171203_011.jpg WP_20171203_010.jpg WP_20171203_009.jpg WP_20171203_006.jpg WP_20171203_008.jpg WP_20171203_012.jpg WP_20171203_004.jpg WP_20171203_002.jpg WP_20171203_001.jpg
     
  8. tazz

    tazz Member

    Messages:
    24
    Location:
    durham
    can you see on pic 5 theres a round thing next to a blue cap whats the number on it pls im in need of 1 for mine thnx

    THNX
     
  9. eddie49 Member

    At a guess, it looks like a potted ferrite ring choke or transformer, possibly used to fire gate trigger pulses at the thyristors.
    If this is true, it will be a specialised component, not available as a generic part.
     
  10. tazz

    tazz Member

    Messages:
    24
    Location:
    durham
    thnx for that im new to electrix
    i thought as long as i had the part number i would be able to get 1 ??????
    mine has i square box smaller than the round 1 welder welds but some of the stages dont work

    thnx
     
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