Miller Big Blue 251D User Manual download pdf (Page 3)

3

Performance Data

FUEL CONSUMPTION CURVE

0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

2.25

2.50

2.75

3.00

0 50 100 150 200 250 300 350 400 450 500 550 600

DC WELD AMPERES AT 100% DUTY CYCLE

US Gal./Hr.

VOLT/AMP CURVE – DC STICK MODE

0

22.5

45

67.5

90

0 100 200 300 400 500 600 700 800 900 1000

DC AMPERES

DC VOLTS

VOLT/AMP CURVE – AC TIG MODE

0

20

40

60

80

100

0 100 200 300 400 500 600

AC AMPERES

AC VOLTS

WELD AND AIR

WELD ONLY

IDLE WITH AIR

IDLE

AIR SUPPLY CURVE

0

20

40

60

80

100

120

140

0102030

40 50 60 70

CFM

PSI

IDLE

300–Max

185–525

125–400

85–250

55–125

VOLT/AMP CURVE – AC STICK MODE

0

20

40

60

80

100

0 100 200 300 400 500 600 700

AC AMPERES

AC VOLTS

VOLT/AMP CURVE – MIG MODE

0

25

50

75

100

0 250 500 750 1000

DC AMPERES

DC VOLTS

MAX

MIN

VOLT/AMP CURVE – DC TIG MODE

0

25

50

75

100

0 100 200 300 400 500 600

DC AMPERES

DC VOLTS

GENERATOR POWER CURVE OPTION

180

200

220

240

260

280

0 10203040506070

AC AMPERES

AC VOLTS

12 kW

1-PHASE

BATTERY CHARGE OUTPUT

0

12.5

25

37.5

50

0 100 200 300 400 500 600 700 800 900 1000

DC AMPS

DC VOLTS

20 kW

3-PHASE

60–450

40–330

30–220

20–110

Ingersoll Rand Rotary Screw

Air Compressor

This industrial-grade compressor, has a life

expectancy of 30,000 hours, is belt driven and

utilizes an electric clutch control to allow the

compressor to be turned off if not needed.

This design increases efficiency, reduces

fuel consumption and saves you money

at the pump. An automatic belt tensioner

provides proper belt tension even after years

of service. The compressor is protected by

a high-temperature shutdown switch.

Toolless

Generator

Brushes

100 percent

copper-wound

generator

features quick

and easy brush and slip ring inspection.

Brushes can be removed and/or replaced

in a matter of seconds.

The Vault

Superior Circuit Board Design

Our critical circuit boards are engineered

to carry

low power

and

low heat

to reduce

thermal stress and minimize expansion and

contraction. In contrast, our competitor’s

boards carry

high power

and

high heat

,

making them more vulnerable to failure.

“The Vault” Makes Upgrading to Miller

®

CC/CV Units Worry-Free

Concerns with circuit board reliability have

resulted in some operators steering clear of

CC/CV welder/generators — even though they

offer a superior arc and multiple welding

processes. Miller circuit board reliability isn’t

a concern since all Big Blue multiprocess

industrial engine drives feature the Vault.

Created out of two aluminum halves sealed

with silicone, as well as watertight harness

connections, the Vault provides a clean circuit

board environment, protecting the electronics

— and controlling output — in heavy industrial

applications. No other competitor protects their

electronics with a sealed vault, leaving critical

circuit boards exposed to harsh elements that

can disrupt the machine’s electronics, and

therefore, its operation.

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