3-5. Connecting 3-Phase Input Power For Models With Customer Supplied Cord

3

= GND/PE Earth Ground

9

8

11

10

4

7

1

 

 

2

 

 

7

 

5

4

6

3

 

 

 

Tools Needed: 5/16 in

3/8 in

YInstallation must meet all National and Local Codes − have only quali- fied persons make this installation.

YDisconnect and lockout/tagout in- put power before connecting input conductors from unit.

YMake input power connections to the welding power source first.

YAlways 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.

1Input Power Conductors (Customer Supplied Cord)

Select size and length of conductors using Section 3-6. 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.

3Fuse Block Cover Remove fuse block cover.

4Machine Grounding Terminal

5Green Or Green/Yellow Grounding Conductor

Connect green or green/yellow grounding conductor to welding power source grounding terminal first.

6Welding Power Source Line Terminals

7Input Conductors L1 (U), L2 (V) And L3 (W)

Connect input conductors L1 (U), L2 (V) and L3 (W) to welding power source line terminals.

Install fuse block cover. Install welding power source wrapper.

Disconnect Device Input Power Connections

8Disconnect Device (switch shown in OFF position)

9Disconnect 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 Over-Current Protection

Select type and size of over-current protection using Section 3-6(fused dis- connect switch shown).

Close and secure door on line disconnect device. Remove lockout/tagout device, and place switch in the On position.

803 766-A / Ref. ST-801 825-C

OM-184 227 Page 9

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Miller Electric Intellifire 250 = GND/PE Earth Ground Tools Needed 5/16, Welding Power Source Input Power Connections