Miller Electric 652, 812 4-2. Duty Cycle And Overheating, , 4-3. Volt-Ampere Curves

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OM-278 Page 11
4-2. Duty Cycle And Overheating
Duty Cycle is percentage of 10 min-
utes 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.
100% Duty Cycle
Overheating 0
15
A/V
OR
Reduce Duty Cycle
Minutes
168 918
Continuous Welding
100 200 300 400 500 600 700 800 900 10000
DC Amperes
DC Volts
4-3. Volt-Ampere Curves
Volt-ampere curves show mini-
mum and maximum voltage and
amperage output capabilities of
unit. Curves of other settings fall be-
tween curves shown.
*High inductance connection.
A. *CC Mode B. CV Mode
168 916-A / 168 917-A
0
10
20
30
40
50
60
70
80
DC Amperes
DC Volts
100 200 300 400 500 600 700 800 900 10000
0
10
20
30
40
50
60
70
SMAW
ARC FORCE
SMAW
ARC FORCE
MIN MAX MIN MAX
SMAW
GTAW MAX
MED
MIN
GMAW
FCAW