12.Enter the Ready condition (see Section 5-1F). The op- erator now has control of the welding power source contactor via the remote contactor control connected to the Remote 14 receptacle.

13.Start welding as follows:

a.Be sure the desired program is active before ex- ecuting a program. The active program is indicated in the applicable repeating display (see Section 5-1F). To select a different program, press Param- eter Select while the repeating displays are shown. This increases the program number.

b.Use the remote contactor control to energize the welding power source contactor. This initiates preflow.

c.If high frequency is enabled, a high-frequency arc initiation at the defined start current level can be performed after preflow.

If high frequency is disabled, a touch or scratch start at the defined initial current level can be per- formed after preflow.

14.While welding, the voltage and amperage meters dis- play the weld voltage and amperage. The weld sequence displays show on the digital display, with time values changing to reflect events being carried out.

15.Weld output can be varied with the remote amperage control. If pulsing is programmed On, the remote am- perage control can increase the weld/peak and background current levels up to the programmed maxi- mum values. The remote amperage control can decrease the weld/peak and background current lev- els down to the defined initial current level.

If pulsing is programmed Off, the remote amperage control can increase the weld current up to the pro- grammed maximum weld level. The remote amperage control can decrease the weld current down to the de- fined initial current level.

16.To stop welding, use the remote contactor control to deenergize the welding power source contactor. Post- flow will be carried out.

17.After postflow is timed out, the control unit returns to the Ready condition. The operator must use the remote contactor control to energize the welding power source contactor to start welding again. If the welding power source contactor is energized during postflow, the pro- gram restarts the weld sequence from the beginning without preflow timing.

6-4. Shielded Metal Arc Welding (SMAW)

1.Be sure welding power source and related equipment are installed as instructed in their respective Owner’s Manuals.

2.Be sure desired weld program (or programs) has been entered.

3.Connect a suitable Contactor/Amperage remote con- trol to the Remote 14 receptacle.

4.Place Mode Selector switch in SMAW position.

5.Wear dry insulating gloves and clothing.

6.Connect work clamp to clean, bare metal at workpiece.

7.Select proper electrode.

8.Insert electrode into electrode holder.

9.Wear welding helmet with proper filter lens according to ANSI Z49.1.

10.Energize welding power source.

11.Enter the Ready condition (see Section 5-1F).

12.Begin welding, observing the following:

a.Be sure the desired program is active before ex- ecuting a program. The active program is indicated in the applicable repeating display (see Section 5-1F). To select a different program, press Param- eter Select while the repeating displays are shown. This increases the program number.

b.A closure of the remote contactor control contacts turns on the welding power source contactor. The control unit waits for an arc to be initiated with the stick electrode.

c.If Remote is enabled in the program (see Section 5-5), the remote control can be used to increase the weld current up to the programmed maximum weld level. The remote amperage control can de- crease the weld current down to the minimum current level the welding power source can pro- vide.

d.If Remote is disabled in the program, the control unit sets the weld output to the programmed weld level value.

e.Opening the remote contacts turns off the welding power source contactor.

f.While welding, the voltage and amperage meters display the weld voltage and amperage.

6-5. Executing Linked Programs

1.Follow the Sequence Of Operation steps for the appli- cable mode (Automatic, Semi-Automatic 1, or Semi-Automatic 5) until the Ready condition is entered.

2.When the repeating displays are shown, press Param- eter Select until the program number increases beyond 4. The Link mode will be active.

3.Be sure the Link position to be executed first is the first one in the Link Position displays.

4.Press Start/Increase on the Remote Pendant to begin linked program execution.

6-6. Executing Combined Programs

1.Follow the Sequence Of Operation steps for the appli- cable mode (Automatic, Semi-Automatic 1, or Semi-Automatic 5) until the Ready condition is entered.

2.When the repeating displays are shown, press Param- eter Select until the program number increases beyond 4. The Link mode will be active.

3.Press Parameter Select again to enter the Combine mode.

4.Press Start/Increase on the Remote Pendant to begin combined program execution.

6-7. Shutting Down

1.Stop welding.

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Miller Electric OM-842 manual Shielded Metal Arc Welding Smaw, Executing Linked Programs, Executing Combined Programs
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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.
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