Duty Cycle And Overheating; Volt-Ampere Curves - Miller Electric Axcess 450 Owner's Manual

4-3. Duty Cycle And Overheating

100% Duty Cycle At 450 Amperes
Continuous Welding
Overheating

4-4. Volt-Ampere Curves

80
70
60
50
40
30
20
10
0
0 100
0
Minutes
CV MODE
200 300 400
A M P E R A G E
60% Duty Cycle At 580 Amperes
6 Minutes Welding
15
OR
Reduce Duty Cycle
500 600 7 00
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
duty cycle before welding.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
4 Minutes Resting
A/V
duty1 4/95 − 220 485-A
Volt-ampere curves show minimum
and maximum voltage
amperage output capabilities of
unit. Curves of other settings fall
between curves shown.
.
This volt-ampere curve
represents the dynamic output
of the unit with a static load.
va_curve1 4/95 − 220 486-A
OM-220 389 Page 15
and