Miller DELTAWELD 650, Owner'S Manual

Page: 15 / 52

OM-272476 Page 9
3-7. 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, error
message is displayed (see Section
10-3), and cooling fan runs. Wait for
unit to cool and error message to
clear. Reduce amperage or duty
cycle before welding.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
Overheating
A/V
OR
Reduce Duty Cycle
duty1 4/95 − SA-181 560 / 263 638-A
Continuous Welding
100% Duty Cycle At 650 Amperes
60% Duty Cycle At 750 Amperes
6 Minutes Welding 4 Minutes Resting
25% Duty Cycle At 815 Amperes
2 1/2 Minutes Welding 7 1/2 Minutes Resting
0
100
200
300
400
500
600
700
800
900
10 100
OUTPUT AMPERES
% DUTY CYCLE
20
30
40
50 60
70 80 90
3-8. Static Output Characteristics
The static (output) characteristics of the welding power source can be described as flat during the GMAW and SAW processes and drooping during
the SMAW, CAC−A 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.