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Fire67
Junior Member
Last Activity: 12-09-2018, 05:03 PM
Joined: 03-15-2014
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  • Fire67
    replied to Shopmaster 300 amp control
    Miller sent me a diagram for the PCB.. Mine is part number 155826, if anyone wants the diagram pm me with an email address. I started from the 10v reference output pin and started going backwards through the circuit. Found 6 resistors out of their individual spec (diagram doesn't give exact specs on
    ...
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  • Want my rig for parts? Everything on it works, just lost the 10v output on the board for amp control.
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  • Fire67
    replied to Shopmaster 300 amp control
    Welp… no 10vdc anything on the 14 pin receptacle... and only seeing 12vac on the contactor output pin when I should be seeing 24vac, however the contactor does work. But as we all know without the 10vdc reference, we have nothing to control amps.
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    Last edited by Fire67; 12-06-2018, 01:22 PM.

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  • Fire67
    replied to Shopmaster 300 amp control
    Ok with help this got interesting....

    78 to 42 im showing 24.3vdc

    79 to 42 Im getting 2.4-2.8vdc if the panel is set anywhere from 50 to about the 200 mark on the panel IF I use the thumb wheel. The amp gauge never goes below 150amps

    If I set it to panel amperage...
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  • Fire67
    replied to Shopmaster 300 amp control
    Yeah just f1 and a 2nd spot with a fuse but no wires going to it.. I actually swapped the wires from one to the other just to try it.. just about to do the other checks now
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  • Fire67
    replied to Shopmaster 300 amp control
    I found one fuse with a spare... is their another functioning fuse? That fuse checked out with an ohm meter. Hd1 pins 1 and 3 show 1636 ohms.

    I'll check the other values in the morning while my wife is around... she gonna freak when I tell her I need her to weld haha
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    Last edited by Fire67; 12-05-2018, 10:01 PM.

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  • Fire67
    started a topic Shopmaster 300 amp control

    Shopmaster 300 amp control

    Shopmaster 300 AC/DC #
    KD473805 with HF 251-d1

    Was welding great one day, next day working with same materials and untouched settings I went to strike and arc and it immediately blew through the material.

    I was set at like 50amps on the panel and using a thumbwheel on my torch,
    ...
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