Duty Cycle And Overheating; Volt-Ampere Curves - Miller Unitor UWI 150 Auto-Line Mode D'emploi

4-4. Duty Cycle And Overheating

250
200
150
100

4-5. Volt-Ampere Curves

Volt-ampere curves show minimum and maximum voltage and amperage output capabilities
of welding power source. Curves of other settings fall between curves shown.
115 VAC Input
80
60
40
TIG Min
20
Stick Min
0
50
0
OM-220 340 Page 14
TIG (115 &230V)
Stick (230V)
Stick (115V)
50
0
10
% Duty Cycle
TIG/Stick Max
100
150
100
80
60
40
TIG Min
20
0
60
200 20 40
0
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
If unit overheats, output stops, the
Overtemperature Light comes On,
and the cooling fan runs. Wait fif-
teen minutes for unit to cool. Re-
duce amperage or duty cycle be-
fore starting to weld again.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
230 VAC Input
TIG/Stick Max
Stick Min
120 140 160 180 200
80 100
208 608-C
223 288-A