6-2. Description Of Front Panel Controls (See Section 6-1)

Engine Starting Controls

1 Preheat Switch

Use switch to energize starting aid for cold weather starting (see starting instructions fol- lowing).

2 Engine Control Switch

Use switch to start engine, select engine speed (if unit has auto idle option), and stop engine.

In Run position, engine runs at weld/power speed. In Auto position (optional), engine runs at idle speed at no load and weld speed with load applied.

3 Engine Stop Lever

Use lever to stop engine if Engine Control switch does not work.

.The Engine Stop lever shuts off the fuel

supply. However, the Engine Stop lever will not stop the engine if the engine can draw fuel-rich air from the surrounding atmosphere (oil refineries).

To Start:

NOTICE − Do not use ether.

.If engine does not start, let engine come

to a complete stop before attempting re- start.

Above 325 F (05 C): turn Engine Control switch to Start. Release Engine Control switch when engine starts.

Below 325 F (05 C): turn engine control switch to Auto position. Push Preheat switch up for 60 seconds. Turn Engine Control switch to Start. Release Engine Control switch and Preheat switch when engine starts.

To Stop: turn Engine Control switch to Off position.

Engine Gauges, Meters, And Lights

4 Fuel Gauge/Hourmeter

Use gauge to check fuel level or total engine operating hours.

To check fuel level or engine hours when en- gine is not running, turn Engine Control switch to Run or Auto (optional) position.

5 Engine Indicator Light

Light goes on and engine stops if engine tem- perature exceeds 230° F (110° C) or engine oil pressure is below 10 psi (69 kPa).

.Normal engine temperature is 180 - 2035 F (82 - 955 C). Normal oil pressure is 30

-60 psi (207 - 414 kPa).

NOTICE − Do not run engine until trouble is fixed.

Weld Controls

6 Remote Control Receptacle

Use receptacle to connect remote controls, wire feeders, and tools.

When a remote control is connected to the Remote receptacle, the Auto Sense Remote feature automatically switches voltage/am- perage control to the remote control (see Sec- tion 5-9).

With remote control connected, weld output is determined by a combination of front panel and remote control voltage/amperage set- tings.

If no remote control is connected to the Re- mote receptacle, the front panel Voltage/Am- perage control adjusts voltage and amper- age.

.If a remote device connected to Remote

Receptacle RC14 is faulty or is discon- nected, the meters display Help 25 (see Section8-11). Clear fault by stopping and restarting the unit or by turning Process/ Contactor switch to another position.

7 Process/Contactor Switch

See Section 6-3for Process/Contactor switch information.

8 Voltage/Amperage Control

With Process/Contactor switch in any Stick or TIG setting, use control to adjust amperage. With Process/Contactor switch in any Wire (MIG) position, use control to adjust voltage. With Voltage/Amperage Adjust Switch in Re- mote position, control limits the remote am- perage in Stick or TIG mode, but has no effect in Wire (MIG) modes.

Weld Meters

.Weld meters also work in combination to

display troubleshooting help codes (see Section 8-11).

9 DC Voltmeter

Voltmeter displays preset voltage (MIG weld- ing) with contactor off, and actual output volt- age with the contactor on. Voltmeter displays voltage at the weld output terminals, but not necessarily the welding arc due to resistance of cable and connections.

To set voltage, turn contactor off and turn Pro- cess/Contactor switch to Wire position. Turn V/A control until desired voltage is displayed on Voltmeter. When welding is finished, volt- meter displays weld voltage and then defaults to preset voltage.

10 DC Ammeter

Ammeter displays preset amperage (Stick and TIG only) when not welding, and actual output amperage when welding.

To set amperage, turn Process/Contactor switch to Stick or TIG position. Turn V/A con- trol until desired amperage is displayed on Ammeter. When welding is finished, ammeter displays weld amperage and then defaults to preset amperage.

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Big Blue 300 specifications

The Miller Electric Big Blue 300 is a powerful and versatile engine-driven welder that has become a popular choice for professionals in various industries. Designed to excel in both welding and generator applications, the Big Blue 300 provides reliable performance, advanced technology, and exceptional durability, making it suitable for demanding work environments.

One of the standout features of the Big Blue 300 is its impressive output capabilities. With a maximum welding output of 300 amps, this machine can handle a wide range of welding applications, from stick to TIG and MIG processes. The dual voltage output allows for versatility in the field, accommodating both 120V and 240V power requirements, ensuring you can power tools and equipment directly from the welder.

The Big Blue 300 is equipped with Miller's innovative Clean Air Technology, which ensures that the engine operates efficiently and produces fewer emissions. This feature not only meets environmental standards but also enhances the longevity of the machine. The cooling system is engineered to maintain optimal operating temperatures, extending the life of the engine and related components.

For ease of use, the Big Blue 300 features an intuitive control panel with easy-to-read gauges and simple adjustment settings, allowing operators to quickly set welding parameters. The built-in Fuel Gauge and Hour Meter provide real-time information about fuel levels and usage, enabling efficient operation and maintenance planning.

Another notable characteristic of the Big Blue 300 is its rugged construction. Built to withstand harsh job site conditions, the machine features a durable frame and heavy-duty components that can endure the rigors of everyday use. The oversized wheels and solid axle design enhance portability, making it easy to transport across various terrains.

Additionally, the Big Blue 300 is designed for quiet operation, making it suitable for locations where noise levels are a concern. Its low decibel rating ensures that it won’t disturb the work environment, contributing to a more comfortable and productive atmosphere.

Overall, the Miller Electric Big Blue 300 is a robust engine-driven welder that combines power, efficiency, and portability. Whether working on construction sites, maintenance tasks, or fabrication projects, this machine delivers exceptional performance and reliability, making it a valuable tool for professionals who demand the best in their equipment.
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