Miller Electric NT 450, NT 500 manual Operation, Controls

Page 26

SECTION 5 − OPERATION

5-1. Controls

2

3

6

 

5

4

7

1

229 448-A

1 Power Switch

.This unit is equipped with a fan motor that

is thermostatically controlled and only runs when cooling is needed.

2Voltmeter (see Section 5-2)

3Ammeter (see Section 5-2)

4Mode Switch

Use Mode switch to determine both process and output On/Off control. Orange areas highlight “contactor on” positions.

5 Panel/Remote Control Switch

For front panel control, place switch in Panel position and use the V/A Adjust control to set amperage or voltage, depending on Mode switch selection.

For remote control, make connections to Re- mote 14 receptacle (see Section 4-11), and place switch in Remote position. In TIG modes, output available through the remote control is a percent of the V/A Adjust control setting. Value selected on V/A Adjust control

is maximum output available through the re- mote control. In the MIG, CC, and V-Sense feeder modes, a remote control provides full range of unit output regardless of V/A Adjust control setting. A remote control is not func- tional in Air-Carbon Arc or Stick modes. If connection to Remote 14 receptacle is re- moved and Panel/Remote control switch re- mains in Remote position, output is controlled with the V/A Adjust control.

6 V/A (Voltage/Amperage) Adjust Control

With Mode switch in any Stick or TIG position, use control to adjust amperage from 5 to 500 amps. With Mode switch in a V-Sense Feeder or MIG position, use control to adjust voltage from 10 to 38 volts.

7 Inductance/Dig Control

Control adjusts Dig when a Stick or CC mode is selected on mode switch. When set to- wards minimum, short-circuit amperage at low arc voltage is the same as normal welding amperage. When set to max, control in- creases short-circuit amperage at low arc

voltage. This allows the operator to use a very short arc length without sticking the electrode. As control is adjusted, the amount of Dig selected is displayed on the amps me- ter as a percentage (0 to 100%) of full range, and dig is displayed on the volts meter.

When Air-Carbon Arc mode is selected, Dig is internally set to max.

Control adjusts inductance when MIG or V- Sense Feeder position is selected on mode switch. Inductance determines the “wetness” of the weld puddle. As setting is increased to- wards maximum, “wetness” (puddle fluidity) increases. As control is adjusted, the amount of inductance selected is displayed on the amps meter as a percentage (0 to 100%) of full range, and ind is displayed on the volts meter.

This control is not functional when one of the TIG modes is selected.

Change control setting to best suite application.

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Contents Description OM-2252218 084RProcesses File Multiprocess WeldingFrom Miller to You Table of Contents Page Electric Shock can kill Symbol UsageArc Welding Hazards HOT Parts can cause severe burnsWelding can cause fire or explosion Fumes and Gases can be hazardousARC Rays can burn eyes and skin Flying Metal or Dirt can injure eyesFalling Unit can cause injury Welding Wire can cause injuryFire or Explosion hazard Moving Parts can cause injuryEMF Information Principal Safety StandardsCalifornia Proposition 65 Warnings About Implanted Medical DevicesSymboles utilisés UNE Décharge Électrique peut entraîner la mortLE Soudage peut provoquer un in cendie ou une explosion DES Pièces Chaudes peuvent provoquer des brûlures gravesLES Fumées ET LES GAZ peuvent être dangereux Risque D’INCENDIE OU D’EXPLO- Sion LE Bruit peut endommager l’ouïeLES Bouteilles peuvent exploser si elles sont endommagées LA Chute DE L’APPAREIL peut blesserLE Soudage À L’ARC risque de provoquer des interférences Proposition californienne 65 AvertissementsLES Fils DE Soudage peuvent provoquer des blessures En ce qui concerne les implants médicaux Principales normes de sécuritéInformation EMF OM-2252 General Precautionary Label − DefinitionsElectric Shock And Airflow Label Nameplate Safety SymbolsInput Connection Label ? aDuty Cycle And Overheating − InstallationSpecifications Volt-Ampere Curves CC ModeCV Mode 100 200 300 400 500 600460 mm Selecting a LocationMovement 460 mm OM-2252Weight Dimensions And WeightsDimensions 376 lb 171 kg Holes EFrontTipping Do not move or operate unit where it could tipTurn Off power before connecting to receptacle VAC Receptacle And Circuit BreakersConnecting Weld Output Cables Weld Output Terminals And Selecting Cable SizesRemote 14 Receptacle Information Connecting Remote ControlTurn off power before con SocketElectrical Service Guide Placing Jumper LinksDisconnect Device Input Power Connec- tions Connecting Input PowerWelding Power Source Input Power Connections = GND/PE Earth Ground− Operation ControlsLift-Arc TIG Procedure For CC/CV Models Meter Functions For CC/CV ModelsDisconnect power before maintaining − Maintenance & TroubleshootingRoutine Maintenance Disconnect input power be- fore opening rear access doorHelp 7 Display Voltmeter/Ammeter Help DisplaysHelp 3 Display Troubleshooting Trouble RemedyWork like a Pro − Electrical Diagram Circuit Diagram For Dimension NT218 081-F − Parts List Main AssemblyTHERMISTOR, NTC 10K OHM @ 25 DEG C 34IN Lead Panel, Front With Components 264Panel, Front With Components -1Item IGBT/Capacitor Assembly IGBT/Capacitor Assembly -1item 221Panel, Rear With Components Page Work like a Pro Support ServiceYour distributor also gives For assistance in filing or settling claims, contact To locate a Distributor or Service Agency visitMiller Electric Mfg. Co Your distributor and/or equipment manufacturer’s
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