Duty Cycle And Overheating - Miller MigMatic S400i Owner's Manual

3-7. Duty Cycle And Overheating

Overheating
OM-287504 Page 10
MigMatic S400i
MigMatic S400iP
MigMatic S500i
60% Duty Cycle
6 Minutes Welding
0
15
Minutes
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
warranty.
4 Minutes Resting
A or V
OR
Reduce Duty Cycle
damage unit and void