Miller Electric 251 NT Operating Welding Generator, Front Panel Controls, DC Polarity/AC Switch

SECTION 5 – OPERATING WELDING GENERATOR

5-1. Front Panel Controls

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1 DC Polarity/AC Switch

YDo not switch under load.

Use switch to select AC weld output or polar- ity of DC weld output.

2 Process Select Switch

YDo not switch under load.

Use switch to select output for weld process.

3 A/V Control

Use control to select weld voltage or amperage. Control may be adjusted while welding.

4 Engine Control Switch

Use switch to start engine, select speed, and stop engine. In Run/Idle position, engine

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runs at idle speed at no load, and weld/power speed under load. In Run position, engine runs at weld/power speed.

.Place switch in Run position to operate most GMAW equipment.

5 Engine Choke Control

Use control to change engine air-fuel mix.

To Start: pull out choke and turn Engine Control switch to Start position. Release switch and slowly push choke in when engine starts.

.If the engine does not start, let the engine come to a complete stop before attempting restart.

To Stop: turn Engine Control switch to Off position.

6Engine Hour Meter

7Output (Contactor) Switch

Use switch to control remote contactor if connected to remote 14 receptacle RC1 (see Section 5-2).

YWeld output terminals are energized when Output (Contactor) switch is On and engine is running.

8 Remote Amperage/Voltage Switch

Use switch to select front panel or remote amperage/voltage control (see Section 5-2).

Ref. ST-189 925-A

OM-486 Page 18