Duty Cycle And Overheating - Miller Electric Millermatic 155 And M-15 Gun Owner's Manual

2-2. Duty Cycle And Overheating

300
250
200
150
100
75
50
Overheating
10 15 20 25 30
% DUTY CYCLE
30% Duty Cycle At 130 Amperes
3 Minutes Welding
0
Minutes
40 50 60 70 80 100
7 Minutes Resting
15
OR
Reduce Duty Cycle
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 or gun and void
warranty.
A or V
duty1 4/95 − SB-180 844
OM-1314 Page 11