Duty Cycle And Overheating; Volt-Ampere Curves - Miller Millermatic 190 Owner's Manual

4-4. Duty Cycle And Overheating

Overheating

4-5. Volt-Ampere Curves

50
45
40
35
30
25
20
15
10
5
0
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40% Duty Cycle at 140 Amps
4 Minutes Welding
0
Minutes
Amps
6 Minutes Resting
15
OR
Reduce Duty Cycle
Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, thermostat(s)
opens and output stops. Wait fifteen
minutes for unit to cool. Reduce
amperage or duty cycle before wel-
ding.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
A or V
duty1 4/95 − 268 358-A
The volt-ampere curves show the
minimum and maximum voltage
and amperage output capabilities of
the welding power source. Curves
of other settings fall between the
curves shown.
Max
Min
268 511-B