Miller Dynasty 400, Owner'S Manual

Page: 30 / 94

OM-275857 Page 20
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Complete Parts List is available at www.MillerWelds.com
4-7. Duty Cycle And Overheating
Duty Cycle is percentage of 10 minutes that
unit
can weld at rated load without
overheating.
If unit overheats, output stops, a Help mes-
sage is displayed (see Section 11-3), 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.
1-4. Duty Cycle And Overheating
200
O
U
T
P
U
T
C
U
R
R
E
N
T
(
A
)
100
0
300
400
500
600
700
800
900
% DUTY CYCLE
10 20 60 100
DUTY CYCLE DYNASTY MAXSTAR 400/800
MD800 3 PHASE
MD800 1 PHASE
MD400 1 PHASE
MD400 3 PHASE
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
4-8. 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.