5.Operating the Welding Generator

5.1Front Panel Controls

Ref. ST-175 918-C

YHeavy loading during first 50 hours will damage engine. Keep load less than 225A (weld) or 7 kVA (power) for first 50 hours.

1 Engine Control Switch

Use switch to operate glow plug (optional − see table), start engine, select speed, and stop engine.

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

.Use Run position for HF-start TIG welding, and to maintain weld/power speed under light auxiliary power loads.

2 Idle Lock Switch

Use switch to lock engine in idle speed dur- ing start-up (see table).

8

Using Idle Lock Switch

2150 rpm

2150 rpm

2150 rpm (No Load) 3700 rpm (Load)

3700 rpm

YDo not weld or use ac receptacles with switch in Idle position.

To Start: move Idle Lock switch to Idle position and Engine Control switch to Start position. Release Engine Control switch when engine starts. Do not crank engine if engine is still turning. Move Idle Lock switch to Run/Idle position after engine warms.

To Stop: turn Engine Control switch to Stop position.

3Engine Hour Meter

4Fuel Gauge

5Engine Oil Pressure Light

Engine stops and light goes on if oil pressure is too low.

6 Polarity Switch (Optional)

Use switch to change polarity of weld output.

9

10

1

76

 

Using Glow

 

Plug

70°F (21°C)

0 s

°

°

10 s

32 F (0 C)

 

°

°

20 s

−4 F (−20 C)

 

7 Arc Force (Dig) Control

Use control to automatically increase amperage as arc length is decreased, to assist in arc starts, and reduce the chance of the electrode freezing in the puddle. Set at minimum for TIG welding.

8Amperage Control

9Voltmeter (Optional)

10Ammeter (Optional)

11Amperage Control Switch

Use switch to select front panel or remote amperage control.

12 Output (Contactor) Control Switch

Use switch to control remote contactor if connected to remote 14 receptacle RC1.

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

2

3

4

5

1112

OM-402

21

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Miller Electric Metro 250D manual Operating the Welding Generator, Front Panel Controls, Using Idle Lock Switch, Plug