Miller Electric STR 450, Owner'S Manual

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OM-236 031 Page 11
3-7. Tipping
!
Do not move or operate unit
where it could tip.
956142737_5 − 5_B
3-8. Weld Output Terminals and Selecting Cable Sizes
NOTICE − The Total Cable Length in Weld Circuit (see table below) is the combined length of both weld cables. For example, if the power source is
30 m (100 ft) from the workpiece, the total cable length in the weld circuit is 60 m (2 cables x 30 m). Use the 60 m (200 ft) column to determine cable
size.
!
Turn off power be-
fore connecting to
weld output termi-
nals.
!
Do not use worn,
damaged, under-
sized, or poorly
spliced cables.
Weld Output
Terminals
Weld Cable Size** and Total Cable (Copper) Length in Weld Circuit
Not Exceeding***
30 m (100 ft) or Less
45 m
(150 ft)
60 m
(200 ft)
70 m
(250 ft)
90 m
(300 ft)
105 m
(350 ft)
120 m
(400 ft)
Welding
Amperes
10 − 60%
Duty
Cycle
mm
2
(AWG)
60 − 100%
Duty
Cycle
mm
2
(AWG)
10 − 100% Duty Cycle
mm
2
(AWG)
Negative
Terminal
Positive
Terminal
956142737_5 − 5_B
100 20 (4) 20 (4) 20 (4) 30 (3) 35 (2) 50 (1) 60 (1/0) 60 (1/0)
150 30 (3) 30 (3) 35 (2) 50 (1) 60 (1/0) 70 (2/0) 95 (3/0) 95 (3/0)
200 30 (3) 35 (2) 50 (1) 60 (1/0) 70 (2/0) 95 (3/0) 120 (4/0) 120 (4/0)
250 35 (2) 50 (1) 60 (1/0) 70 (2/0) 95 (3/0) 120 (4/0)
2x70
(2 ea. 2/0)
2x70
(2 ea. 2/0)
300 50 (1) 60 (1/0) 70 (2/0) 95 (3/0) 120 (4/0)
2x70
(2 ea. 2/0)
2x95
(2 ea. 3/0)
2x95
(2 ea. 3/0)
350 60 (1/0) 70 (2/0) 95 (3/0) 120 (4/0)
2x70
(2 ea. 2/0)
2x95
(2 ea. 3/0)
2x95
(2 ea. 3/0)
2x120
(2 ea. 4/0)
400 60 (1/0) 70 (2/0) 95 (3/0) 120 (4/0)
2x70
(2 ea. 2/0)
2x95
(2 ea. 3/0)
2x120
(2 ea. 4/0)
2x120
(2 ea. 4/0)
500 70 (2/0) 95 (3/0) 120 (4/0)
2x70
(2 ea. 2/0)
2x95
(2 ea. 3/0)
2x120
(2 ea. 4/0)
3x95
(3 ea. 3/0)
3x95
(3 ea. 3/0)
600 95 (3/0) 120 (4/0)
2x70
(2 ea. 2/0)
2x95
(2 ea. 3/0)
2x120
(2 ea. 4/0)
3x95
(3 ea. 3/0)
3x120
(3 ea. 4/0)
3x120
(3 ea. 4/0)
*
This chart is a general guideline and may not suit all applications. If cable overheats, use next size larger cable.
**Weld cable size is based on either a 4 volts or less drop or a current density of at least 300 circular mils per ampere.
***For distances longer than those shown in this guide, call a factory applications representative.
Milan Ref. S-0007-G 2009 − 08