Miller Electric NT 450, NT 500 Connecting Input Power, = GND/PE Earth Ground, Tools Needed 1/2

Page 25

4-14. Connecting Input Power

9

 

= GND/PE Earth Ground

 

 

 

 

 

8

 

 

 

11

 

 

 

10

 

 

 

 

2

4

 

 

 

7

 

 

 

 

 

1

 

 

 

IMPORTANT

 

 

6

3

 

 

Input Contactor

 

 

L1 (U)

 

 

7

L2 (V)

 

4

 

L3 (W)

 

 

 

 

5

4

 

 

 

3

 

 

 

 

 

 

= GND/ PE Earth Ground

Tools Needed: 1/2 in

3/8 in

! 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/yel- low conductor to supply grounding terminal first, and never to a line ter- minal.

See rating label on unit and check input volt- age available at site.

1Input 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.

3Machine Grounding Terminal

4Green Or Green/Yellow Grounding Conductor

5Reed Switch (Ground Current Sensor) (Optional)

Connect green or green/yellow grounding conductor to welding power source ground- ing terminal first. If unit is equipped with op- tional ground current sensor, route ground- ing conductor through reed switch two times and connect to grounding terminal.

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 ter- minals.

Close and secure access door on welding power source.

Disconnect Device Input Power Connec- tions

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 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.

800 103-C / Ref. 801 116-A

OM-2252 Page 21

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Contents Processes OM-2252218 084RDescription File Multiprocess WeldingFrom Miller to You Table of Contents Page Arc Welding Hazards Symbol UsageElectric Shock can kill HOT Parts can cause severe burnsARC Rays can burn eyes and skin Fumes and Gases can be hazardousWelding can cause fire or explosion Flying Metal or Dirt can injure eyesFire or Explosion hazard Welding Wire can cause injuryFalling Unit can cause injury Moving Parts can cause injuryCalifornia Proposition 65 Warnings Principal Safety StandardsEMF Information About Implanted Medical DevicesUNE Décharge Électrique peut entraîner la mort Symboles utilisésLES Fumées ET LES GAZ peuvent être dangereux DES Pièces Chaudes peuvent provoquer des brûlures gravesLE Soudage peut provoquer un in cendie ou une explosion LES Bouteilles peuvent exploser si elles sont endommagées LE Bruit peut endommager l’ouïeRisque D’INCENDIE OU D’EXPLO- Sion LA Chute DE L’APPAREIL peut blesserLES Fils DE Soudage peuvent provoquer des blessures Proposition californienne 65 AvertissementsLE Soudage À L’ARC risque de provoquer des interférences Information EMF Principales normes de sécuritéEn ce qui concerne les implants médicaux OM-2252 − Definitions General Precautionary LabelInput Connection Label Nameplate Safety SymbolsElectric Shock And Airflow Label ? aSpecifications − InstallationDuty Cycle And Overheating CV Mode CC ModeVolt-Ampere Curves 100 200 300 400 500 600Movement Selecting a Location460 mm 460 mm OM-2252Dimensions Dimensions And WeightsWeight 376 lb 171 kg Holes EFrontTurn Off power before connecting to receptacle Do not move or operate unit where it could tipTipping VAC Receptacle And Circuit Breakers Weld Output Terminals And Selecting Cable Sizes Connecting Weld Output CablesTurn off power before con Connecting Remote ControlRemote 14 Receptacle Information SocketPlacing Jumper Links Electrical Service GuideWelding Power Source Input Power Connections Connecting Input PowerDisconnect Device Input Power Connec- tions = GND/PE Earth GroundControls − OperationMeter Functions For CC/CV Models Lift-Arc TIG Procedure For CC/CV ModelsRoutine Maintenance − Maintenance & TroubleshootingDisconnect power before maintaining Disconnect input power be- fore opening rear access doorHelp 3 Display Voltmeter/Ammeter Help DisplaysHelp 7 Display Trouble Remedy TroubleshootingWork like a Pro Circuit Diagram For Dimension NT − Electrical Diagram218 081-F Main Assembly − Parts ListTHERMISTOR, NTC 10K OHM @ 25 DEG C 34IN Lead 264 Panel, Front With ComponentsPanel, Front With Components -1Item IGBT/Capacitor Assembly 221 IGBT/Capacitor Assembly -1itemPanel, Rear With Components Page Work like a Pro Your distributor also gives ServiceSupport Miller Electric Mfg. Co To locate a Distributor or Service Agency visitFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s
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