Duty Cycle And Overheating; Volt-Ampere Curves - Miller Electric Migmatic 271 Owner's Manual

3-2. Duty Cycle And Overheating

60% Duty Cycle At 400 Amperes
6 Minutes Welding
Overheating

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.
% DUTY CYCLE
4 Minutes Resting
0
Minutes
Model 271
MAX
MIN
MIN
Model 333
MAX
MIN
100% Duty Cycle At 300 Amperes
Continuous Welding
15
OR
Reduce Duty Cycle
MIN
Model 293
MAX
MIN
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
warranty.
A or V
sduty1 5/95 / 187 478-A
Model 273
MAX
Model 383
MAX
OM-223 194 Page 9
void