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Miller Electric OM-842 manual Semi-Automatic 4 Mode Sequence

Models: OM-842

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Weld/Peak

Initial C Current D Final

SlopeSlope

Initial

Final

Current B

Current

Preflow

Postflow

A

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

B:Maintained closure of Start/Increase push button increases weld out- put; maintained closure of Decrease push button decreases weld output.

C:Release of Start/Increase or Decrease push button sets weld/peak current (output remains at level existing when push button released).

D:Maintained closure of Decrease push button decreases weld output to programmed final current level; final current starts.

Preflow: Time programmed/Volume set by gas meter.

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

Initial Current: Time undefined/Level programmed.

Initial Slope: Controlled by Start/Increase and Decrease push buttons/ Slope rate of change calculated by microprocessor control.

Weld/Peak Current: Time undefined/Level determined by weld output level when Start/Increase or Decrease push button released.

Final Slope: Controlled by Start/Increase and Decrease push buttons/ Slope rate of change calculated by microprocessor control.

Final Current: Time & Level programmed.

Postflow: Time programmed/Volume set by gas meter.

Weld/peak current can 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, initial slope, weld/peak current, and final slope. The operator uses the Start/In- crease and Decrease push buttons to vary the weld current level once initial current starts.

The first momentary closure of the Start/Increase push button starts the sequence. Following start level, each time the Start/Increase push button is pressed and held weld out- put increases at a rate calculated by the microprocessor control. The rate of increase depends on the pro- grammed initial current level, weld/ peak current level, and initial slope time. Each time the Decrease push button is pressed and held, weld out- put decreases at a rate calculated by the microprocessor control. The rate of decrease depends on the pro- grammed weld/peak current level, fi- nal current level, and final slope time. The weld output will maintain at the level that exists when either the Start/Increase or Decrease push button is released. The programmed values that normally define the weld/ peak current level define the upper limit that the Start/Increase push but- ton can command.

The weld output level can be in- creased and decreased indefinitely until the operator decreases the weld current down to the pro- grammed final current level. At this point the sequence enters final cur- rent and then postflow. If the weld current never exceeds the pro- grammed final current value, the op- erator must decrease the weld cur- rent to zero, at which time postflow will begin.

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 4-4. Semi-Automatic 4 Mode Sequence

OM-842 Page 19

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Miller Electric OM-842 manual Semi-Automatic 4 Mode Sequence, Weld/Peak Initial C Current D Final SlopeSlope Current B
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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.