Miller 907439002, Owner'S Manual

Page: 24 / 90

OM-249474 Page 18
5-4. Duty Cycle And Overheating
Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool. Reduce amperage or
duty cycle before welding.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
Overheating
0
15
A/V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 − 220 485-A
Continuous Welding
100% Duty Cycle At 450 Amperes 60% Duty Cycle At 580 Amperes
6 Minutes Welding 4 Minutes Resting
5-5. Volt-Ampere Curves
va_curve1 4/95 − 220 486-A
Volt-ampere curves show minimum
and maximum voltage and
amperage output capabilities of
unit. Curves of other settings fall
between curves shown.
.
This volt-ampere curve
represents the dynamic output
of the unit with a static load.
0
10
20
30
40
50
60
70
80
0 100 200 300 400 500 600 700
AMPERAGE
VOL
TAGE
CV MODE