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OM-249 498 Page 13
4-3. Duty Cycle And Overheating
Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool. Reduce amperage or
duty cycle before welding.
NOTICE − Exceeding duty cycle
can damage unit or gun and void
warranty.
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 − 249 620-A
30% duty cycle at 150 amps
3 Minutes Welding 7 Minutes Resting
230 VAC
20% duty cycle at 90 amps
2 Minutes Welding 8 Minutes Resting
115 VAC