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OM-925 Page 10
4-2. Duty Cycle And Overheating
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.
Overheating
0
15
A or V
OR
Reduce Duty Cycle
Minutes
duty1 4/95 − 217 623-A / 217 757-A
A. 115 VAC Model
B. 230 VAC Model
20% duty cycle at 90 amps
30% duty cycle at 130 amps, 60 Hz
20% duty cycle at 130 amps, 50 Hz
1
410
20
40 60 100
2
6808
10
20
40
60
80
100
200
140
Duty Cycle %
Output Amperes
10
20
40
60
80
100
200
10 20 30 40 50
60 70 80 100
130
180
Duty Cycle %
Output Amperes
3 Minutes Welding 7 Minutes Resting
2 Minutes Welding 8 Minutes Resting