Duty Cycle And Overheating; 4-10. Static Characteristics - Miller Auto-Line XMT 350 MPa Owner's Manual

4-9.

Duty Cycle And Overheating

11-2. Duty Cycle And Overheating
500
425
400
350
300
250
200
150
100
10 15
60 Percent Duty Cycle
Overheating

4-10. 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.
� A complete Parts List is available at www.MillerWelds.com
Complete Parts List is available at www.MillerWelds.com
20 25 30 40 50 60 70 80 90 100
% DUTY CYCLE
0
Minutes
Duty Cycle is percentage of 10 minutes that
unit
overheating.
If unit overheats, output stops, a Help mes-
sage is displayed and cooling fan runs. Wait
fifteen minutes for unit to cool. Reduce am-
perage or voltage, or duty cycle before
welding.
�
Single Phase Operation: The unit is
NOTICE – Exceeding duty cycle can damage
unit and void warranty.
THREE PHASE
OPERATION
6 AWG POWER CORD
8 AWG POWER CORD
Ref. 216 568-A
15
OR
Reduce Duty Cycle
can weld at rated load
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.
SINGLE PHASE
OPERATION
A or V
OM-231242 Page 15
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without