9-5. Adjusting Engine Speed

Engine Speed

(No Load)

Weld/Power

1850 rpm

(61.6 Hz)

 

 

 

 

Idle

1500 rpm

(50 Hz)

 

Standard Models

3

1

2

1 2

Models With Automatic Idle (Optional)

YStop engine and let cool.

Engine speed is factory set and should not require adjustment. Af- ter tuning engine, check engine speed with tachometer or frequen- cy meter. See table for proper no load speed. If necessary, adjust speed as follows:

Start engine and run until warm.

On CC Models, place Stick/TIG switch in Stick position.

On CC/CV models, turn Process/ Contactor switch to Stick − Elec- trode Hot position.

Standard Models

1Adjustment Screw

2Lock Nut

Loosen nuts. Turn screws out sev- eral turns.

3 Speed Lever

Start engine and move lever until engine runs at weld/power speed. Tighten adjustment screws and lock nuts.

.Do not set engine speed higher than specified.

Models With Automatic Idle (Optional)

Idle Speed Adjustment

4Throttle Rod/Plunger

5Locknut

Loosen locknut. Place Engine Con- trol switch in Run/Idle position.

Turn throttle rod and plunger until engine runs at idle speed. Tighten locknut.

.Be sure solenoid plunger pulls all the way in (“bottoms”) when energized.

Weld/Power Speed Adjustment

6Engine Weld/Power Speed Adjustment Screw

7Locknut

Place Engine Control switch in Run

position.

6

4 5

Loosen locknut. Turn screw until engine runs at weld/power speed. Tighten locknut.

. Do not set engine speed higher than specified.

Y Stop engine.

7

Close door.

Tools Needed:

5/16 in

802 168-C / 802 229-A / Ref. 202 705

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OM-491 Page 39

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Miller Electric Big Blue 602P Adjusting Engine Speed, Engine Speed No Load, Standard Models, Weld/Power Speed Adjustment

Big Blue 602P, Big Blue 502P, Big Blue 402P specifications

Miller Electric is a well-respected name in the welding industry, known for its high-quality portable welders that cater to a wide range of applications. Among their iconic products are the Big Blue 502P, Big Blue 402P, and Big Blue 602P, each offering unique features and capabilities suited to professional welders.

The Miller Big Blue 502P is recognized for its robust construction and high-performance capabilities. Powered by a reliable diesel engine, it provides 500 amps of welding power at a duty cycle of 100%. This model is particularly favored for its versatility, accommodating both stick and TIG welding processes. One of its key technologies is the Auto-Set feature, which automatically adjusts settings for optimal performance based on the material thickness. This welder also boasts a user-friendly interface, complete with easy-to-read digital displays for monitoring essential parameters.

In contrast, the Big Blue 402P offers a slightly lower welding output while maintaining many of the advanced features seen in its larger counterpart. With a maximum output of 400 amps, it is perfectly suited for light to medium-duty applications. The 402P is particularly lightweight for a diesel welder, making it an ideal choice for contractors who need mobility without sacrificing power. It includes the X-Mode technology, which ensures reliable performance in challenging conditions and offers an intuitive control panel for ease of use.

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In summary, the Miller Electric Big Blue 502P, 402P, and 602P each bring unique strengths to the welding market. Their notable features include advanced technologies, robust construction, and versatile applications, ensuring that professionals have the right tool for any welding job. Whether for light-duty tasks or heavy industrial applications, Miller Electric's Big Blue series remains a cornerstone for welders around the globe.