Posted by david - or on January 25, 2009 at 04:55:25 from (134.134.139.71):
In Reply to: Re: Generator help posted by 7lazy77 on January 24, 2009 at 22:27:25:
The input voltage on the welder is 230 Volts (U1)
The max input current on the welder is 50 amps. (I1) The expectation is that the AC input frequency is 60 HZ.
The open circuit voltage of the welder OUTPUT (rod holder to ground clamp) is 79 volts (Uo)
The rated performance (current/voltage) of the welder OUTPUT (rod holder to ground) is 225 amps (I2) at an arc voltage of 25 Volts (U2). This is for alternating current output (the ~ symbol)
Thus, the welder draws 50 amps at 230 volts to obtain full rated performance.
Most actual use of these welders does not approach the full rated output. Smaller rods, lower "heat" settings, shorter arc lengths all reduce output power and hence required input current. So in typical practice you may be able to operate it off a 30 amp breaker even though it is too small for the welder at max performance.
The max duty cycle on these welders is 20%. (Weld one minute out of 5). Thus the 230 volt supply wires serving the welder can be smaller than the "50 amp" input requirement would otherwise suggest.
Will the welder work off the generator? Yes, at the lower settings, but not especially well. The sudden change of demand as the arc is struck (from mear zero to near max) is tough on the average cheap generator.
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