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Miller Electric OM-842 manual Introduction to Programming, General, Weld Sequence, Balance Control

Models: OM-842

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SECTION 4 – INTRODUCTION TO PROGRAMMING

4-1. General

Programs are created when parameters are defined in a series of displays. Up to four programs can be entered into each of the four modes of operation, for a total of sixteen programs. In addition, programs in certain modes can be linked or combined to run in a user-defined sequence.

This welding power source provides high frequency or scratch starting, preflow timing, start current level control and timing, initial current level control and timing, initial slope timing, final slope timing, final current level control and timing, postflow timing, and am- perage control of weld/peak current for either a pulsing or nonpulsing weld current. Pulsing controls include on/off selection, pulse peak level control and timing, background current level control and timing, and pulse frequency and average current calculations.

4-2. Weld Sequence

Initial

Weld/Peak

Final

Current

Slope

 

Slope

Initial

 

Final

Current

 

Current

Preflow

 

Postflow

Preflow: The period during which shielding gas flows before an arc is established.

Start Level (Not Shown): A current level that can be programmed to ease arc starting.

Initial Current: The beginning maintained current level.

Initial Slope: The ramping of the initial current up to the programmed weld/ peak current level.

Weld/Peak Current: The programmed weld current level (divided into peak and background current levels when pulsing is enabled).

Final Slope: The ramping down of weld/peak current to the programmed final current level.

Final Current: The end current level just before the arc is extinguished.

Postflow: The period during which shielding gas flows after the arc has been extinguished.

In most cases, the weld sequence shown here is used in programming the control. Which steps are pro- grammable and what initiates each step varies from mode to mode.

Ref. SB-139 983

4-3. Balance Control

Balance Control Waveform Examples

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

55% Electrode

 

More Cleaning

Positive

 

45% Electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Negative

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

32% Electrode

 

 

 

 

 

More Penetration

Positive

 

 

 

68% Electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Negative

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50% Electrode

 

 

 

 

 

 

 

 

 

 

Balanced

Positive

 

 

 

 

 

 

 

 

 

 

 

 

50% Electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

Negative

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When ac output is selected on the Process Selector switch, a balance control value must be programmed. The balance control value can be used to change the weld arc charac- teristics for either more penetration or more cleaning. The electrode negative (EN) value is user- programmed, and the electrode pos- itive (EP) value changes accordingly so the sum always equals 100%.

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Miller Electric OM-842 manual Introduction to Programming, General, Weld Sequence, Balance Control
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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.