Duty Cycle And Overheating - Miller AlumaPower 350 MPa Auto-Line Owner's Manual

4-4. Duty Cycle And Overheating

500
425
400
350
300
250
200
150
100
10
15
Overheating
20
25 30 40 50
% DUTY CYCLE
60% Duty Cycle
6 Minutes Welding
0
Minutes
THREE PHASE
OPERATION
6AWG POWER CORD
8AWG POWER CORD
60 70 80 90 100
4 Minutes Resting
15
Reduce Duty Cycle
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
If unit overheats, output stops, a Help
message is displayed and cooling fan
runs. Wait fifteen minutes for unit to
cool. Reduce amperage or voltage, or
duty cycle before welding.
.
Single Phase Operation: The
unit is supplied with a 8 AWG
power cord. The rated output
with 8 AWG is 300 amps, 32
volts at 40% duty cycle. To
achieve 60% duty cycle change
cord to 6 AWG.
NOTICE − Exceeding duty cycle can
damage unit and void warranty.
SINGLE
PHASE
OPERATION
A or V
OR
Ref. 216 568-A
OM-240 712 Page 13