Duty Cycle Chart - Miller XPS 350 Owner's Manual

3-4. Duty Cycle Chart

500
450
400
350
300
250
200
150
0 10
50% Duty Cycle at 450A
5 Minutes Welding
Overheating
450 Amp Model
20 30 40 50
% Duty Cycle
5 Minutes Resting
100% Duty Cycle at 320V
Continuous Welding
0
15
Minutes
60 70 80 90
60% Duty Cycle at 410A
6 Minutes Welding
A
OR
Reduce Duty Cycle
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.
100
4 Minutes Resting
duty1 4/95 / Ref. 168 919
OM-249 332 Page 9