Miller Electric Big 40 CAT manual Connecting To Weld Output Terminals, Selecting Weld Cable Sizes

S-0007-E−

5-8. Connecting To Weld Output Terminals

Tools Needed:

3/4 in

1

802 311 2

YStop engine.

1Positive (+) Weld Output Terminal

2Negative (−) Weld Output Terminal

Stick and TIG Welding

For Stick and TIG welding Direct Current Elec- trode Positive (DCEP), connect electrode holder cable to Positive (+) terminal on left and work cable to Negative (−) terminal on right.

For Direct Current Electrode Negative (DCEN), reverse cable connections.

If equipped with optional Polarity switch or op- tional Polarity/AC switch, connect electrode holder cable to Electrode (+) terminal on left and work cable to Work (−) terminal on right.

MIG and FCAW Welding

For MIG and FCAW welding Direct Current Electrode Positive (DCEP) on CC/CV models, connect wire feeder cable to Positive (+) termi- nal on left and work cable to Negative (−) ter- minal on right. Use Process/Contactor switch to select type of weld output (see Section 7-3).

For Direct Current Electrode Negative (DCEN), reverse cable connections.

If equipped with optional Polarity switch or op- tional Polarity/AC switch, connect wire feeder cable to Electrode (+) terminal on left and work cable to Work (−) terminal on right.

5-9. Selecting Weld Cable Sizes*

			Weld Cable Size** and Total Cable (Copper) Length in Weld Circuit
					Not Exceeding***
			100 ft (30 m) or Less		150 ft	200 ft	250 ft	300 ft	350 ft	400 ft
					(45 m)	(60 m)	(70 m)	(90 m)	(105 m)	(120 m)
	Weld Output
	Terminals
Y Stop engine before		Welding	10 − 60%	60 − 100%
connecting to weld out-			Duty	Duty		10 − 100% Duty Cycle
put terminals.		Amperes
			Cycle	Cycle

YDo not use worn, dam- aged, undersized, or poorly spliced cables.

100	4 (20)	4 (20)	4 (20)	3 (30)	2 (35)	1 (50)	1/0 (60)	1/0 (60)
150	3 (30)	3 (30)	2 (35)	1 (50)	1/0 (60)	2/0 (70)	3/0 (95)	3/0 (95)
200	3 (30)	2 (35)	1 (50)	1/0 (60)	2/0 (70)	3/0 (95)	4/0 (120)	4/0 (120)
250	2 (35)	1 (50)	1/0 (60)	2/0 (70)	3/0 (95)	4/0 (120)	2 ea. 2/0	2 ea. 2/0
							(2x70)	(2x70)
300	1 (50)	1/0 (60)	2/0 (70)	3/0 (95)	4/0 (120)	2 ea. 2/0	2 ea. 3/0	2 ea. 3/0
						(2x70)	(2x95)	(2x95)
350	1/0 (60)	2/0 (70)	3/0 (95)	4/0 (120)	2 ea. 2/0	2 ea. 3/0	2 ea. 3/0	2 ea. 4/0
					(2x70)	(2x95)	(2x95)	(2x120)
400	1/0 (60)	2/0 (70)	3/0 (95)	4/0 (120)	2 ea. 2/0	2 ea. 3/0	2 ea. 4/0	2 ea. 4/0
					(2x70)	(2x95)	(2x120)	(2x120)
500	2/0 (70)	3/0 (95)	4/0 (120)	2 ea. 2/0	2 ea. 3/0	2 ea. 4/0	3 ea. 3/0	3 ea. 3/0
				(2x70)	(2x95)	(2x120)	(3x95)	(3x95)

*This chart is a general guideline and may not suit all applications. If cable overheating occurs (normally you can smell it), use next size larger cable.

**Weld cable size (AWG) is based on either a 4 volts or less drop or a current density of at least 300 circular mils per ampere. ( ) = mm2 for metric use

***For distances longer than those shown in this guide, call a factory applications representative at 920-735-4505.

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