9-7. Overload Protection

 

 

 

Y Stop engine.

 

 

 

. When a circuit breaker or fuse

 

 

 

 

opens, it usually indicates a

 

 

 

 

more serious problem exists.

 

 

 

 

Contact Factory Authorized

 

 

 

 

Service Agent.

 

 

 

1

Fuse F1

 

 

 

2

Fuse F2

 

 

 

F1 and F2 protect the stator exciter

 

 

 

winding from overload. If F1 opens,

 

 

 

weld and generator power is low or

 

 

 

stops entirely. If F2 opens, weld out-

 

 

 

put is low or stops entirely. 4 kVA/

 

 

 

kW generator power is still avail-

 

2

1

able.

 

 

 

 

 

 

3 Circuit Breaker CB4 (Not

 

 

 

 

Shown)

 

 

 

4

Circuit Breaker CB5

 

 

 

 

(CC/CV Models Only)

 

 

 

5

Circuit Breaker CB6

 

 

 

 

(CC/CV Models Only)

 

9

 

6

Circuit Breaker CB10 (Not

 

8

 

 

Shown)

 

7

 

7

Circuit Breaker CB11

 

 

 

8

Circuit Breaker CB12

 

 

 

9

Circuit Breaker CB13

 

 

 

CB4 protects the welding arc drive

 

 

 

(dig) circuit. If CB4 opens, electro-

 

 

 

de may stick to the workpiece more

 

 

 

frequently during low voltage (short

 

 

 

arc length) conditions. CB4 auto-

 

 

 

matically resets when the fault is

4

5

 

corrected.

 

CB5 protects the 24 volt ac output

 

 

 

 

 

 

to remote receptacle RC14, and 24

 

 

 

volt output to field current regulator

 

 

 

board PC1 (CC/CV models only). If

 

 

 

CB5 opens, weld output and 24 volt

 

 

 

output to RC14 stops. On units with

 

 

 

optional three−phase generator,

 

 

 

output at receptacle RC5 also stops

 

 

 

if CB5 opens.

 

 

 

CB6 protects the 115 volt ac output

 

 

 

to remote receptacle RC14 (CC/CV

 

 

 

models only). If CB6 opens, 115 volt

 

 

 

output to RC14 stops.

 

 

 

CB10 protects the engine battery

 

 

 

circuit. If CB10 opens, the engine

 

 

 

will not crank. CB10 automatically

 

 

 

resets when the fault is corrected.

 

 

 

CB11 protects the engine wiring

 

 

 

harness. On CC models, if CB11

 

 

 

opens the max OCV circuit does

 

 

 

not work and open circuit voltage is

 

 

 

variable at all times (see max OCV

 

 

 

note under Weld Controls in Sec-

 

 

 

tion 6-2). If CB11 opens on CV mod-

 

 

 

els, weld output stops (generator

 

 

 

power is still available).

 

 

 

CB12 protects the field flashing cir-

 

 

 

cuit. If CB12 opens, the generator

 

 

 

may not excite at start-up and weld

 

 

 

and generator power output may

 

 

 

not be available.

 

 

 

CB13 protects the engine shut-

 

 

 

down circuit. If CB13 opens, the en-

 

 

 

gine cranks but does not start.

 

 

 

Press button to reset breaker.

 

 

 

 

802 170-E

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OM-491 Page 41

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Miller Electric Big Blue 402P, Big Blue 602P, Big Blue 502P manual Overload Protection, Stop engine
Page 44 Page 46

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.

The Big Blue 602P, on the other hand, stands out for its high output and exceptional reliability. With a maximum capacity of 600 amps, this machine is designed for heavy-duty applications, making it perfect for industrial settings. The welder features advanced cooling systems and robust construction, which enhance durability and longevity. One notable characteristic of the 602P is its ability to handle various welding processes, including Stick, TIG, and MIG, making it a versatile tool for skilled welders. Additionally, the Big Blue 602P incorporates advanced inverter technology, resulting in a lighter and more energy-efficient model without compromising power performance.

All three models benefit from Miller's commitment to innovation and user-centric design features. Built to thrive in tough work environments, the Big Blue series is equipped with protective casings and vibration-resistant components. Safety is also a priority, with several built-in features that help protect users during operation.

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.
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