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Resistor+caps

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  • Greetings Mr. Setsuda

     

    I just replaced the capacitors in my Lincoln SP250 wire feed welder after they went off like volcanoes inside my machine while I was working on a project. While I was welding, I could hear them venting and stopped in the middle of my weld to witness this hideous cloud of white smoke fuming from my machine. I think I incorrectly made the assumption that since my machine was still working when this happened and the screw connections on the old capacitors exhibited signs of arching, I could get away with just replacing them. I was able to find replacements with similar specs from Newark except the new caps were physically smaller.

     

    Old:

    MEPCO/CENTRALABS

    S13490-120

    3120 EG303U050AMA5

    30000 UF -10 + 75%

    50 VDC 75 SURGE

    85 C MAX AMBIENT

    362 9016 56699

    2.0 OD X 5.12 LG

     

    New:

    UNITED CHEMI-CON

    E32D500HPN333MAB7ME32D500HPN333MAB7M

    33000 UF +-20%

    50V

    105 C MAX AMBIENT

    1.38 OD X 4.60 LG

     

    After I put the new caps in the machine, I went to tack a couple of pieces of metal togeter and noticed the output of the welder was much lower than it should have been for the machine setting. After the third tack, one of the new caps vented and I shut the machine off.

     

    Being that I'm just a mechanical designer, my electrical skills are pretty weak (obviously) and I'd like to get some advice from someone with more experience. I'm wondering if there are any components in the circuit I should test (rectifier/diodes, transformer, block, etc.) that could be the source of the trouble or did I just completely miss the mark on using these caps as a replacement. Any help would be greatly appreciated.

     

    Dave Buckalew

  • in reply to Former Member

    Hello Dave san

     

    Thank you for your question,

    But Unfortunately I can not find out MEPCO web and MEPCO Capacitor SPEC in Web site.

    It seems that MEPCO SPEC and UNITED CHEMI-CON SPEC is not same.

     

    MEPCO

    30000 UF -10 + 75%

    50 VDC 75 SURGE

    Maximum ESR (mΩ) at 25deg,120Hz

    UNITED CHEMI-CON

    33000 UF +-20%

    50V

    Maximum ESR (mΩ) at 25deg,120Hz

    12.5

    Rated Ripple Current (A rms) at 85deg,120Hz

    17.22

     

    In case of such kind of big capacitance and big current capacitor

    You should use completely same SPEC capacitor as MEPCO.

    Unfortunately

    Panasonic does not have screw type capacitor.

     

    Thank you for your understanding.

     

    Thanks

    Setsuda

Reply
  • in reply to Former Member

    Hello Dave san

     

    Thank you for your question,

    But Unfortunately I can not find out MEPCO web and MEPCO Capacitor SPEC in Web site.

    It seems that MEPCO SPEC and UNITED CHEMI-CON SPEC is not same.

     

    MEPCO

    30000 UF -10 + 75%

    50 VDC 75 SURGE

    Maximum ESR (mΩ) at 25deg,120Hz

    UNITED CHEMI-CON

    33000 UF +-20%

    50V

    Maximum ESR (mΩ) at 25deg,120Hz

    12.5

    Rated Ripple Current (A rms) at 85deg,120Hz

    17.22

     

    In case of such kind of big capacitance and big current capacitor

    You should use completely same SPEC capacitor as MEPCO.

    Unfortunately

    Panasonic does not have screw type capacitor.

     

    Thank you for your understanding.

     

    Thanks

    Setsuda

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