14. connecting input power, Important – Miller Electric NT 456 CC User Manual

Page 24

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OM-2243 Page 20

4-14. Connecting Input Power

800 103-C / Ref. 801 116-A

3/8 in

3/8 in

Tools Needed:

!

Installation must meet all National

and Local Codes − have only quali-

fied persons make this installation.

!

Disconnect and lockout/tagout in-

put power before connecting input

conductors from unit.

!

Make input power connections to

the welding power source first.

!

Always connect green or green/

yellow conductor to supply

grounding terminal first, and never

to a line terminal.

See rating label on unit and check input

voltage available at site.
1

Input Power Conductors (Customer

Supplied Cord)

Select size and length of conductors using

Section 4-12. Conductors must comply

with national, state, and local electrical

codes. If applicable, use lugs of proper

amperage capacity and correct hole size.
Welding Power Source Input Power

Connections
2

Strain Relief

Route conductors (cord) through strain re-

lief and tighten screws.
3

Machine Grounding Terminal

4

Green Or Green/Yellow Grounding

Conductor

5

Reed Switch (Ground Current

Sensor) (Optional)

Connect green or green/yellow grounding

conductor to welding power source

grounding terminal first. If unit is equipped

with optional ground current sensor, route

grounding conductor through reed switch

two times and connect to grounding termi-

nal.
6

Welding Power Source Line

Terminals

7

Input Conductors L1 (U), L2 (V) And

L3 (W)

Connect input conductors L1 (U), L2 (V)

and L3 (W) to welding power source line

terminals.
Close and secure access door on welding

power source.
Disconnect Device Input Power Con-

nections
8

Disconnect Device (switch shown in

OFF position)

9

Disconnect Device (Supply)

Grounding Terminal

Connect green or green/yellow grounding

conductor to disconnect device grounding

terminal first.
10 Disconnect Device Line Terminals
Connect input conductors L1 (U), L2 (V)

And L3 (W) to disconnect device line

terminals.
11 Overcurrent Protection
Select type and size of overcurrent protec-

tion using Section 4-12 (fused disconnect

switch shown).
Close and secure door on line disconnect

device. Remove lockout/tagout device,

and place switch in the On position.

IMPORTANT

GND/

3

PE Earth Ground

Input Contactor

L1 (U)
L2 (V)
L3 (W)

= GND/PE Earth Ground

8

5

4

2

11

6

3

7

4

9

4

10

1

=

7

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