Lincoln Electric LF-72/74 service manual AA-5

Models: LF-72/74

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AA-5

INSTALLATION

AA-5

 

 

SAFETY PRECAUTION

 

 

ELECTRIC SHOCK can kill.

 

 

• Only qualified personnel should

 

 

perform this installation.

 

 

• Turn off the input power to the

 

 

power source at the disconnect

 

 

switch or fuse box before working

 

 

on this equipment. Turn off the

 

 

input power to any other equipment

 

 

connected to the welding system at

 

 

the disconnect switch or fuse box

 

 

before working on this equipment.

 

Do not touch electrically hot parts.

 

----------------------------------------------------------------------

 

WELD CABLE SIZES

Table A.1 has the copper cable sizes recommended for different currents and duty cycles. Lengths stipulated are the distance from the welder to work and back to the welder again. Cable sizes are increased for greater lengths primarily for the purpose of minimizing voltage in the welding circuit.

TABLE AA.1

RECOMMENDED CABLE SIZES (RUBBER COVERED COPPER - RATED 75°C)**

CABLE SIZES FOR COMBINED LENGTHS OF ELECTRODE AND WORK CABLES

 

 

Percent

 

0 to 50 Ft.

 

 

50 to 100Ft.

 

 

100 to 150 Ft.

 

 

150 to 200 Ft.

 

 

200 to 250 Ft.

 

 

 

Duty

 

 

 

 

 

 

31 to 48 m

 

 

48 to 61 m

 

 

61 to 76 m

 

 

Amperes

Cycle

0 to 15 m

 

 

15 to 31 m

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200

60

 

2

 

 

2

 

 

2

 

 

1

 

 

1/0

 

200

100

 

2

 

 

2

 

 

2

 

 

1

 

 

1/0

 

225

20

 

4 or 5

 

 

3

 

 

2

 

 

1

 

 

1/0

 

225

40 & 30

 

3

 

 

3

 

 

2

 

 

1

 

 

1/0

 

250

30

 

3

 

 

3

 

 

2

 

 

1

 

 

1/0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

250

40

 

2

 

 

2

 

 

1

 

 

1

 

 

1/0

 

250

60

 

1

 

 

1

 

 

1

 

 

1

 

 

1/0

 

250

100

 

1

 

 

1

 

 

1

 

 

1

 

 

1/0

 

300

60

 

1

 

 

1

 

 

1

 

 

1/0

 

 

2/0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

325

100

 

2/0

 

 

2/0

 

 

2/0

 

 

2/0

 

 

3/0

 

350

60

 

1/0

 

 

1/0

 

 

2/0

 

 

2/0

 

 

3/0

 

400

60

 

2/0

 

 

2/0

 

 

2/0

 

 

3/0

 

 

4/0

 

400

100

 

3/0

 

 

3/0

 

 

3/0

 

 

3/0

 

 

4/0

 

500

60

 

2/0

 

 

2/0

 

 

3/0

 

 

3/0

 

 

4/0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

**Tabled values are for operation at ambient temperatures of 40°C and below. Applications above 40°C may require cables larger than recommended, or cables rated higher than 75°C.

LF-72/74

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Lincoln Electric LF-72/74 service manual AA-5