Duty Cycle And Overheating - Miller MILLERMATIC 135 Owner's Manual

3-2. Duty Cycle And Overheating

140
120
A. 115 VAC
Model
100
80
60
40
20
0
10
200
B. 230 VAC
Model
180
160
140
120
100
80
60
40
20
0
10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Overheating
OM-1324 Page 10
RatedOutput
20 30 40 50
Duty Cycle %
20% duty cycle at 90 amps
2 Minutes Welding
Duty Cycle %
30% duty cycle at 130 amps, 60 Hz
20% duty cycle at 130 amps, 50 Hz
3 Minutes Welding
0
Minutes
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60 70 80 90 100
8 Minutes Resting
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 − 203 771 / 203 796