Duty Cycle And Overheating; Volt-Ampere Curves - Hobart Handler 125 Owner's Manual

4-2. Duty Cycle And Overheating

200
135
100
80
60
40
20
10
1
Overheating

4-3. Volt-Ampere Curves

28
26
24
22
20
18
16
14
12
10
8
0 10 20
OM-947 Page 12
4 6 8
2
Duty Cycle %
20% duty cycle at 85 amps
2 Minutes Welding
Minutes
30 40 50 60 70
Amperage
10 40 60
20
8 Minutes Resting
0
15
Reduce Duty Cycle
80 90 100 110 120
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 or gun and void
warranty.
80 100
A or V
OR
duty1 4/95 − 210 517-B
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.
Range 1
Range 2
Range 3
Range 4
130
ssb1.1 10/91 − 210 518-B