Duty Cycle And Overheating; Volt-Ampere Curves - Hobart Welders H-10 Owner's Manual

4-2. Duty Cycle And Overheating

200
175
130
100
80
60
40
20
10
10
Overheating

4-3. Volt-Ampere Curves

30
25
20
15
10
5
0
0 10 20 30 40 50
OM-228 187 Page 10
20 30
Duty Cycle %
30% duty cycle at 130 amps, 60 Hz
20% duty cycle at 130 amps, 50 Hz
3 Minutes Welding
0
Minutes
7
6
5
4
3
2
1
6 0 70 80 90 100 110 120 130 140 150 160 170 180 190 200
Amperage
40 50 60 70 80 100
7 Minutes Resting
15
OR
Reduce Duty Cycle
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.
Y Exceeding duty cycle can
damage unit or gun and void
warranty.
A or V
duty1 4/95 − 217 757-A
The volt-ampere curves show the
minimum and maximum voltage
and amperage output capabilities of
the welding power source. Curves
of other settings fall between the
curves shown.
ssb1.1 10/91 − 228 183-A