Duty Cycle And Overheating; Volt-Ampere Curve - Miller Electric Millermatic 350P Aluminum Owner's Manual

4-5. Duty Cycle And Overheating

500
400
300
250
225
200
150
100
60% Duty Cycle At 300 Amperes
6 Minutes Welding
Overheating

4-6. Volt-Ampere Curve

OM-254915 Page 12
.
A complete Parts List is available at www.MillerWelds.com
10 15 20 25 30
% DUTY CYCLE
4 Minutes Resting
0
Minutes
40 50 60 70 80 90 100
40% Duty Cycle At 350 Amperes
4 Minutes Welding
15
OR
Reduce Duty Cycle
Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, thermistors open,
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.
6 Minutes Resting
A or V
sduty1 5/95 / 217 442-A
The volt-ampere curves show the
normal minimum and maximum
voltage and amperage output
capabilities of the welding power
source. Curves of other settings fall
between the curves shown.
217 443-A