4-8. Duty Cycle And Overheating − 60 Hz Operation

100% Duty Cycle At 250 Amperes

Continuous Welding

Duty Cycle is percentage of 10 min- utes that unit can weld at rated load without overheating.

NOTICE − Exceeding duty cycle can damage unit and void warranty.

 

1000

 

 

 

 

 

 

 

 

 

 

 

800

 

 

 

 

 

 

 

 

 

 

AMPERES

600

 

 

 

 

 

 

 

 

 

 

500

 

 

 

 

 

 

 

 

 

 

400

 

 

 

 

 

 

CC

 

 

 

 

 

 

 

 

 

CV

 

 

 

300

 

 

 

 

 

 

 

 

 

WELD

 

 

 

 

 

 

 

 

 

 

250

 

 

 

 

 

 

 

 

 

 

200

 

 

 

 

 

 

 

 

 

 

 

150

 

 

 

 

 

 

 

 

 

 

 

100

10

15

20

25

30

40

50

60

80

100

% DUTY CYCLE

217 515

4-9. AC Generator Power Curve

The ac power curve shows the gen- erator power in amperes.

 

2 40

120

 

 

 

 

 

 

 

 

2 00

100

 

 

 

 

 

 

 

VOLTS

1 60

80

 

 

 

 

 

 

 

1 20

60

 

 

 

 

 

 

 

A C

80

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

20

 

 

 

 

 

 

 

 

0

0

 

 

 

 

 

 

 

 

 

0

20

40

60

80

100

120

140

AC AMPERES IN 110 V MODE

0

10

20

30

40

50

60

70

 

 

A C A MPERES IN 22 0V MODE

 

 

223 185-A

OM-223 037 Page 19

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Image 25
Miller Electric Big Blue 400 PX manual Duty Cycle And Overheating − 60 Hz Operation, AC Generator Power Curve