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OM-223 194 Page 9
3-2. Duty Cycle And Overheating
6 Minutes Welding 4 Minutes Resting
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
voltage, or duty cycle before
welding.
Y Exceeding duty cycle can
damage unit and void
warranty.
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
60% Duty Cycle At 400 Amperes 100% Duty Cycle At 300 Amperes
sduty1 5/95 / 187 478-A
% DUTY CYCLE
Continuous Welding
3-3. Volt-Ampere Curves
The volt-ampere curves show the normal minimum and maximum voltage and amperage output capabilities of the welding power source. Curves
of other settings fall between the curves shown.
Model 273
Model 333
Model 271
Model 383
MIN
MAX
MIN
MAX
MIN
MAX
MAX
MIN
Model 293
MIN
MAX