Weld/Peak

Initial

Current C Final

Slope

Slope

Initial

Final

Current B

Current D

Preflow

Postflow

A

A:Momentary closure of Start/Increase push button starts sequence.

B:Momentary closure of Start/Increase push button ends initial current.

C:Momentary closure of Start/Increase push button ends weld/peak cur- rent.

D:Momentary closure of Start/Increase push button ends final current.

Preflow: Time programmed/Volume set by gas meter.

Start Level (Not Shown): Time & level programmed.

Initial Current: Time undefined/Level programmed.

Initial Slope: Time programmed/Slope calculated by microprocessor control.

Weld/Peak Current: Time undefined/Level programmed.

Final Slope: Time programmed/Slope calculated by microprocessor control.

Final Current: Time undefined/Level programmed.

Postflow: Time programmed/Volume set by gas meter.

Weld/peak current cannot be increased or decreased during welding.

Stop push button functions throughout sequence if Stop Button Detect is en- abled in the program.

In this mode, time values are not de- fined for initial current, weld/peak current, and final current. The micro- processor control operates in a mo- mentary-contact, single button for- mat. The operator presses the Start/ Increase push button to start the pro- gram, presses it again to signal the end of initial current, presses it again to signal the end of weld/peak cur- rent, and presses it for a last time to signal the end of final current.

The weld amperage cannot be in- creased or decreased once the se- quence has started.

If Stop Button Detect is enabled in the weld program, pressing the Stop push button stops program execu- tion and starts postflow. If Stop But- ton Detect is disabled, pressing the Stop push button has no affect. Postflow starts if the arc is manually broken.

Ref. SB-139 983

Figure 4-2. Semi-Automatic 2 Mode Sequence

Weld/Peak

Initial Current C Final

SlopeSlope

Initial

Final

 

Current B

Current

D

Preflow

 

 

Postflow

A

A:Maintained closure of Start/Increase push button starts sequence.

B:Release of Start/Increase push button ends initial current.

C:Maintained closure of Start/Increase push button ends weld/peak cur- rent.

D:Release of Start/Increase push button ends final current.

Preflow: Time programmed/Volume set by gas meter.

Start Level (Not Shown): Time & level programmed.

Initial Current: Time undefined/Level programmed.

Initial Slope: Time programmed/Slope calculated by microprocessor control.

Weld/Peak Current: Time undefined/Level programmed.

Final Slope: Time programmed/Slope calculated by microprocessor control.

Final Current: Time undefined/Level programmed.

Postflow: Time programmed/Volume set by gas meter.

Weld/peak current cannot be increased or decreased during welding.

Stop push button functions throughout sequence if Stop Button Detect is en- abled in the program.

In this mode, time values are not de- fined for initial current, weld/peak current, and final current. The micro- processor control operates in a maintained-contact, single button format. The operator presses and holds the Start/Increase push button to start the sequence. The Start/In- crease push button is released to signal the end of initial current. The sequence will then cycle through to weld/peak current. The operator presses and holds the Start/In- crease push button to signal the end of weld/peak current. The sequence will then cycle through to final cur- rent. The Start/Increase push button is released to signal the end of final current.

The weld amperage cannot be in- creased or decreased once the se- quence has started.

If Stop Button Detect is enabled in the weld program, pressing the Stop push button stops program execu- tion and starts postflow. If Stop But- ton Detect is disabled, pressing the Stop push button has no affect. Postflow starts if the arc is manually broken.

Ref. SB-139 983

Figure 4-3. Semi-Automatic 3 Mode Sequence

OM-842 Page 18

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Miller Electric OM-842 manual Weld/Peak, Initial Current C Final Slope Current B Current D Preflow

OM-842 specifications

The Miller Electric OM-842 is a versatile and powerful multi-process welding machine designed for professional welders who demand efficiency and reliability on the job. This industrial-grade welder is capable of handling various welding processes, including MIG, TIG, stick, and flux-cored welding, making it an ideal choice for a wide range of applications.

One of the standout features of the OM-842 is its robust output capability. With a maximum output of 400 amps, it can tackle thick materials with ease while maintaining exceptional arc stability. This output range allows for adaptability in different welding scenarios, whether working on heavy fabrication projects or lighter home repairs.

The OM-842 is also equipped with advanced inverter technology. This technology enhances the machine's efficiency and reduces energy consumption. Inverter machines are known for their lightweight design compared to traditional transformer welders, which makes the OM-842 more portable and easier to transport between job sites.

User-friendliness is paramount in the design of the OM-842. Its intuitive control panel features a digital display that provides real-time information on parameters such as voltage and amperage. This allows users to make quick and precise adjustments on the fly, enhancing productivity and ensuring optimal welding results.

Additionally, the OM-842 offers sophisticated weld control features, such as Auto-Set, which simplifies the setup process for beginners and experienced users alike. This technology automatically selects optimal parameters based on the material type and thickness, minimizing trial and error during welding.

The machine also includes a durable and rugged design, suitable for tough working conditions. The protective case and high-quality components ensure longevity and reliability even in adverse environments.

Safety is another critical aspect of the OM-842, with features such as over-temperature protection and a built-in fan to prevent overheating during extended use.

With its powerful performance, advanced technology, and robust design, the Miller Electric OM-842 stands out as an exceptional choice for welders seeking reliability and versatility in their welding operations, ultimately creating high-quality welds across various applications. Whether in a shop or on a construction site, the OM-842 is engineered to deliver outstanding results every time.