OM-271 435 Page 9
3-4.
Duty Cycle and Overheating
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.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
3.5 Minutes Welding
6.5 Minutes Resting
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
35% Duty Cycle At 400 A
6 Minutes Welding
4 Minutes Resting
60%Duty Cycle At 305 A
100% Duty Cycle At 240 A
Continuous
Welding
% Duty Cycle
W
eld Amperes
0
10
20
30
40
50
60
70
80
90
100
50
100
150
200
250
300
350
400
