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OM-487 Page 11
ST-189 268
The ac auxiliary power curve
shows the auxiliary power available
in amperes at the receptacles.
3-4. Auxiliary Power Curve
0
20 40 60 80 100 120 140 160
0
20
40
60
80
100
120
140
0
120
80
40
200
160
280
240
AC POWER AMPERES AT 120V
AC POWER AMPERES AT 240V
0
10 20 30 40 6050 70 80
AC POWER VOLTS
Duty cycle is the percentage of 10
minutes that unit can weld at rated
load without overheating.
Y Exceeding duty cycle can
damage unit and void
warranty.
100% Duty Cycle at 290 Amperes DC
ST-189 274
Continuous Welding
3-5. Duty Cycle
0
10
20 30 40 50 60
100
70 80
90
150
175
200
225
250
275
300
% DUTY CYCLE
WELD AMPERES
DC/CC
DC/CV
AC/CC