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OM-944 Page 10
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3-2. 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.
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 − 196 617 / 196 618
A. 115 VAC Model
B. 230 VAC Model
3 Minutes Welding 7 Minutes Resting
Duty Cycle %
Output Amperes
10
20
40
60
80
100
200
10
20
30
40 50
60 70 80 100
130
20% duty cycle at 90 amps
30% duty cycle at 130 amps, 60 Hz
20% duty cycle at 130 amps, 50 Hz
2 Minutes Welding 8 Minutes Resting
Duty Cycle %
Output Amperes
1
410
20
40 60 100
2
6808
10
20
40
60
80
100
200
135