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Old 07-01-14, 12:32 PM   #25
oil pan 4
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Yes there is major concern for the life of the capacitors in non motor applications.
These capacitors are all rated for 370 to 440 volts and it turns out motor run capacitors work really well on motor applications L to N and L to L.
They dont work so well connected line to line (only 240 volts) on stick welders. Seems that motor run capacitors burn out after a few seconds of arc welding when connected line to line with out MOV protection.

I have used motor run capacitors in my stick welder wired line to neutral with out MOVs and have burned 20 pounds of electrode with out any problems.
I have since upgraded the stick welder to actual pfc capacitors rated for 480v, wired them L to N and then gave them MOV protection. Dont think I will have any more problems.

Last edited by oil pan 4; 07-01-14 at 12:37 PM..
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