Duty Cycle And Overheating - Miller Millermatic 140 Auto-Set Owner's Manual

.
A complete Parts List is available on-line at www.MillerWelds.com

3-2. Duty Cycle And Overheating

Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, thermostat(s)
A. 115 VAC
opens, output stops, and cooling
Model
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.
20% Duty Cycle at 90 Amps
2 Minutes Welding 8 Minutes Resting
B. 230 VAC
Model
30% Duty Cycle at 135 Amps, 60 Hz
3 Minutes Welding 7 Minutes Resting
Overheating
A or V
0
15
OR
Reduce Duty Cycle
Minutes
duty1 4/95 − 230 342-A / 230 343-A
OM-225 311 Page 12