OM-257 798 Page 16
4-7. Duty Cycle And Overheating
Duty Cycle is percentage of 10 min-
utes 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 and void warranty.
5 Minutes Welding 5 Minutes Resting
Overheating
0
15
A/V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 − SA-268 499-A / 268 498-A
Continuous Welding
100% Duty Cycle At 350 Amperes 60% Duty Cycle At 350 Amperes
350 Model
0
15
A/V
OR
Reduce Duty Cycle
Minutes
Continuous Welding
50% Duty Cycle At 600 Amperes
500 Model
6 Minutes Welding 4 Minutes Resting
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