Duty Cycle And Overheating; Volt-Ampere Curves - Hobart Handler 140 Technical Manual

3-3. Duty Cycle And Overheating

200
140
100
80
60
40
20
10
1
Overheating

3-4. Volt-Ampere Curves

30
25
20
15
10
5
0
0 10 20 30 40
TM-258 267 Page 4
2 4 6 8 10
Duty Cycle %
20% duty cycle at 90 amps
2 Minutes Welding
0
Minutes
50 60 70 80 90 100
Amperage
40 60 80
20
8 Minutes Resting
15
OR
Reduce Duty Cycle
RANGE 5
RANGE 4
RANGE 3
RANGE 2
RANGE 1
110 120 130 140 150
Duty Cycle is percentage of 10
minutes that unit can weld at rated
load without overheating.
If unit overheats, thermostat(s)
opens, over temperature LED
lights, output stops, and cooling fan
runs. Wait fifteen minutes for unit to
cool, the therostat will automatically
reset. Reduce amperage or duty
cycle before welding.
NOTICE − Exceeding duty cycle
can damage unit or gun and void
warranty.
100
A or V
duty1 4/95 − 217 623-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 − 257 981-A
Handler 140