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3-4. Duty Cycle and Overheating
500
450
400
350
300
250
200
150
0
10
35% Duty Cycle At 450 A
3.5 Minutes Welding
Overheating
20
30
40
50
% Duty Cycle
6.5 Minutes Resting
100% Duty Cycle At 270 A
Continuous
Welding
0
Minutes
60
70
80
90
100
60%Duty Cycle At 350 A
6 Minutes Welding
15
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.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
4 Minutes Resting
A or V
OR
OM-249 914 Page 9
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