Duty Cycle And Overheating; Static Characteristics - Miller Maxstar 400 Owner's Manual

4-5. Duty Cycle And Overheating

900
800
700
600
500
400
300
200
100
0
10
Overheating

4-6. Static Characteristics

The static (output) characteristics of the welding power source can be described as drooping during the SMAW and GTAW processes. Static
characteristics are also affected by control settings (including software), electrode, shielding gas, weldment material, and other factors. Contact
the factory for specific information on the static characteristics of the welding power source.
OM-275857 Page 18
.
A complete Parts List is available at www.MillerWelds.com
DUTY CYCLE DYNASTY MAXSTAR 400/800
20
% DUTY CYCLE
0
15
Minutes
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 10-3), 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.
MD800 3 PHASE
MD800 1 PHASE
MD400 1 PHASE
MD400 3 PHASE
60
A or V
OR
Reduce Duty Cycle
100