Duty Cycle And Overheating - Miller XMT 400 Owner's Manual

4-4. Duty Cycle And Overheating

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 (see
Section 7-3), and cooling fan runs.
Wait fifteen minutes for unit to cool.
Reduce amperage or duty cycle be-
fore welding.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
60% Duty Cycle
6 Minutes Welding 4 Minutes Resting
Overheating
A
0
15
OR
Reduce Duty Cycle
Minutes
Ref. SA-178 651
OM-217769 Page 13