Duty Cycle And Overheating; Volt-Ampere Curves - Miller Auto Invision II Owner's Manual

3-5. Duty Cycle And Overheating

100% Duty Cycle At 450 Amperes
Continuous Welding
Overheating

3-6. Volt-Ampere Curves

OM-201 396 Page 20
60% Duty Cycle At 565 Amperes
6 Minutes Welding
0
15
Reduce Duty Cycle
Minutes
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.
Y Exceeding duty cycle can
damage unit and void war-
ranty.
4 Minutes Resting
A/V
OR
duty1 4/95 – 181 560
Volt-ampere curves show minimum
and maximum voltage and amper-
age output capabilities of unit.
Curves of other settings fall be-
tween curves shown.
va_curve1 4/95 – 181 562