Duty Cycle And Overheating; Ac Generator Power Curve - Miller Big Blue 300 PRO Series Owner's Manual

4-8. Duty Cycle And Overheating

1000
800
600
500
400
300
250
200
150
100
10

4-9. AC Generator Power Curve

150 300
125 250
100 200
75 150
50 100
25 50
0 0
0
0
OM-259 355 Page 20
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Complete Parts List is available at www.MillerWelds.com
1
CV
15 20 25 30
% DUTY CYCLE
20 40
AC AMPERES IN 240 V MODE
40 80
AC AMPERES IN 120 V MODE
CC
40 50 60 80 100
60
120
1 100% Duty Cycle
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
.
This unit is rated for welding at
250 amperes continuously.
NOTICE − Exceeding duty cycle
can damage unit and void warranty.
The AC power curve shows the
generator power in amperes avail-
able at the 120 and 240 volt
receptacles.
80
160
217 515
237 494