Duty Cycle And Overheating; Static Characteristics - Miller Millermatic 355 Owner's Manual

4-7.

Duty Cycle And Overheating

400 A @ 25% Duty Cycle For 3 Phase And 460/575 Single Phase
Operation
2.5 Minutes Welding
310 A @ 60% Duty Cycle For 3 Phase And 460/575 Single Phase
Operation
4-8.

Static Characteristics

The static (output) characteristics of the welding power source can be described as flat during the GMAW process and 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.
7.5 Minutes Resting
0
15
Minutes
350 A @ 35% Duty Cycle For 208/240 Single Phase Operation
3.5 Minutes Welding
310 A @ 60% Duty Cycle For 208/240 Single Phase Operation
A or V
OR
Reduce Duty Cycle
Duty cycle is the percentage of
10 minutes that unit can weld at
rated load without overheating.
If unit overheats or duty cycle is
exceeded, the output stops, a
Help message is displayed, and
cooling fans run. Wait fifteen mi-
nutes for unit to cool. Reduce
amperage or duty cycle before
welding.
NOTICE – Exceeding duty cycle
can damage unit and void
warranty.
6.5 Minutes Resting
OM-288360 Page 15