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OM-1314 Page 10
2-3. Duty Cycle And Overheating
3 Minutes Welding 7 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
duty cycle before welding.
Y Exceeding duty cycle can
damage unit or gun and void
warranty.
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 – SB-180 844
30% Duty Cycle At 130 Amperes
300
250
200
150
100
75
50
10 15 20 25 30 40 50 60 70 80 100
DC AMPERES
% DUTY CYCLE