Welding Power Source Duty Cycle And Overheating; Volt-Ampere Curves - Miller Electric Millermatic 212 Auto-Set Owner's Manual

4-2. Welding Power Source Duty Cycle And Overheating

60% Duty Cycle At 160 Amperes
6 Minutes Welding
Overheating

4-3. Volt-Ampere Curves

35
30
25
20
15
10
5
0
0
OM-238 118 Page 12
.
A complete Parts List is available at www.MillerWelds.com
4 Minutes Resting
0
15
Minutes
200
100
AMPERES
Duty Cycle is percentage of 10
minutes 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
voltage, or duty cycle before
welding.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
30% Duty Cycle At 210 Amperes
3 Minutes Welding
A or V
OR
Reduce Duty Cycle
Volt-ampere curves show minimum
and
amperage output capabilities of
unit. Curves of other settings fall
between curves shown.
300
7 Minutes Resting
duty1 4/95 − 256 218-A
maximum voltage and
va_curve1 4/95 − 238 553-A