Miller Electric OM-842 manual Operation Procedures For Semi-Automatic 1 Mode

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

11.Be sure applicable remote control device is connected as follows:

a.Semi-Automatic 1 Mode:

Connect Remote Pendant to Remote 4 receptacle RC2.

b.Semi-Automatic 2 Mode:

Connect Remote Pendant to Remote 4 receptacle RC2.

c.Semi-Automatic 3 Mode:

Connect Remote Pendant to Remote 4 receptacle RC2.

d.Semi-Automatic 4 Mode:

Connect Remote Pendant to Remote 4 receptacle RC2.

e.Semi-Automatic 5 Mode:

Do not make connections to Remote 4 receptacle RC2 at this time.

12.Energize welding power source.

13.If using the Semi-Automatic 5 mode, connect Remote Pendant to Remote 4 receptacle RC2 at this time.

14.Be sure the desired program is active before executing

aprogram. The active program is indicated in the appli- cable repeating display (see Section 5-1F). To select a different program, press Parameter Select while the re- peating displays are shown. This increases the program number.

15.Begin welding, observing the operation procedures for the applicable Semi-Automatic mode (see Sections 6-2B through 6-2F).

16.In all Semi-Automatic modes, the voltage and amper- age meters display the weld voltage and amperage while welding. The weld sequence displays are shown on the digital display, with time values changing to re- flect events being carried out.

B.Operation Procedures For Semi-Automatic 1 Mode

1.When the unit is in the Ready condition (see Section 5-1F), momentarily press Start/Increase to begin the weld sequence.

2.During the Weld Time portion of the program, the Start/ Increase or Decrease push buttons may be pressed and held to modify the weld current level within the de- fined amperage adjustment limits (see Section 2-4). The programmed values will not be affected.

3.Before the weld sequence reaches Weld Time, the Stop push button may be pressed to end the program prematurely and send the weld sequence to postflow.

4.The Stop push button must be pressed during Weld Time to signal the end of weld/peak current. When Stop is pressed, the weld sequence enters final slope. Once Weld Time is terminated, the Stop push button has no affect on program operation.

5.After postflow is timed out, the control unit returns to the Ready condition and waits for the next closure of the Start/Increase push button. If Start/Increase is pressed

during postflow, the program restarts the weld se- quence from the beginning without preflow timing.

C.Operation Procedures For Semi-Automatic 2 Mode

1.When the unit is in the Ready condition (see Section 5-1F), momentarily press Start/Increase to begin the weld sequence. After arc initiation at initial current, the control unit maintains the programmed initial current value.

2.Start/Increase must be pressed to signal the end of ini- tial time and the beginning of initial slope. Following initial slope, the control unit maintains Weld Time cur- rent.

3.Start/Increase must be pressed to signal the end of Weld Time and the beginning of final slope. Following final slope, the control unit maintains the arc at the final current level

4.Start/Increase must be pressed to signal the end of fi- nal current and the beginning of postflow.

5.After postflow is timed out, the control unit returns to the Ready condition and waits for the next closure of the Start/Increase push button. If Start/Increase is pressed during postflow, the programs restart the weld se- quence from the beginning without preflow timing.

6.The Stop push button is not functional in this mode. However, the existence of the arc is monitored by the control unit. If the arc is manually broken, the program goes directly to postflow.

D.Operation Procedures For Semi-Automatic 3 Mode

1.When the unit is in the Ready condition (see Section 5-1F), press and hold the Start/Increase push button to begin the weld sequence. After arc initiation at initial current, the control unit maintains the programmed ini- tial current value.

2.Release the Start/Increase to signal the end of initial time and the beginning of initial slope. Following initial slope, the control unit maintains the programmed weld current.

3.Press and hold Start/Increase to signal the end of Weld Time and the beginning of final slope. Following final slope, the control unit maintains the arc at the final cur- rent level.

4.Release Start/Increase to indicate the end of final cur- rent and the beginning of postflow.

5.After postflow is timed out, the control unit returns to the Ready condition and waits for the next maintained clo- sure of the Start/Increase push button. If Start/Increase is pressed and held during postflow, the program re- starts the weld sequence from the beginning without preflow timing.

6.The Stop push button is not functional in this mode. However, the existence of the arc is monitored by the control unit. If the arc is manually broken, the program goes directly to postflow.

E.Operation Procedures For Semi-Automatic 4 Mode

1.When the unit is in the Ready condition (see Section 5-1F), momentarily press Start/Increase to begin the weld sequence. After arc initiation at initial current, the

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Contents OM-842162074B ProcessesDescription From Miller to You Table of Contents Page Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding HazardsBuildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyesPrincipal Safety Standards About Pacemakers EMF InformationLES Fumé ES ET LES GAZ peuvent ê tre dangereux Signification des symbolesConsignes DE Securite Lire Avant Utilisation UN Choc É Lectrique peut tuerLE Soudage peut provoquer un incendie ou une explosion DES Particules Volantes peuvent blesser les yeuxLE Bruit peut affecter l’ouïe DES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peutPrincipales normes de sé curité Information sur les champs é lectromagné tiquesConsignes relatives aux stimulateurs cardiaques Installation Connecting Remote Pendant Or Equivalent User-Wired ControlRemote 4 Socket Information User Relay Contacts Pulse signal, and for a wire feederRocker Switch Settings = On = Off Setting DIP Switch SW1Work Clamp Safety EquipmentOperation ControlsMode Selector Switch Ammeter And VoltmeterDigital Display Left/Decrease Push Button Program/Run/Reset Keyed SwitchParameter Select Push Button Right/Increase Push ButtonPurge Push Button Remote PendantShielding Gas Balance Control Introduction to ProgrammingGeneral Weld SequenceStart Level Not Shown Time & level programmed Automatic Mode SequenceSemi-Automatic Mode Sequence Modes Of OperationWeld/Peak Initial Current C Final Slope Current B Current D PreflowWeld/Peak Initial Current C Final SlopeSlope Current B Weld/Peak Initial C Current D Final SlopeSlope Current B Semi-Automatic 4 Mode SequenceInitial Slope Weld/Peak Current Final Slope Final Current Smaw ModeWeld/Peak Initial Current B Final Slope Slope Preflow PostflowProgramming Procedure Up To Pulse Mode Selection Automatic ModeProcedure With Pulse Mode On, Pulses Defined In Time Values S T F L O W Procedure With Pulse Mode On, Pulses Defined As a FrequencyProcedure Following Pulse Mode Definition N a LE R E M O T E T O A R T Semi-Automatic ModeA R T O P# 0 X I N I T I a L P S = X X X Procedure With Pulse Mode On, Pulses Defined As a Frequency X X X X X X X O P B U T T O N D E T E C TManual Gtaw Mode X X X X R R E N T C O N T R O LSmaw Mode Editing a Program# 0 X a R C C O N T R O L R C E N T a G E = 0 0 0 % N K P O S I T I O N X X X X X X X Dry Run FeatureStop Watch Feature Linking ProgramsM B I N E P O S I T I O N X X I S X X X X X X Combining ProgramsM B I N E M O D E O G R a M L I N K M O D EGas Tungsten Arc Welding Gtaw In The Semi-Automatic Modes Gas Tungsten Arc Welding Gtaw In The Automatic ModeShared Initial Procedure Sequence of OperationOperation Procedures For Semi-Automatic 4 Mode Operation Procedures For Semi-Automatic 1 ModeOperation Procedures For Semi-Automatic 2 Mode Operation Procedures For Semi-Automatic 3 ModeOperation Procedures For Semi-Automatic 5 Mode Gas Tungsten Arc Welding Gtaw In The Manual ModeShutting Down Shielded Metal Arc Welding SmawExecuting Linked Programs Executing Combined ProgramsDiagnostics Overheating ProtectionIntroduction Diagnostics Program Programming Push Button TestsRAM Test Repeating Test Displays Program/Run/Reset Keyed Switch TestsMode Selector Switch Test Output Selector Switch TestR G E B U T T O N S T W O R K I N G O P E R L YE a S E T U R N K N O B T O Purge Push Button Test+10 Volt DC Reference Test User Relays Background Relay TestArc Starter Relay Test Gas Solenoid Relay TestS H D E C R E a S E B U T T O N R E M O T E Remote Pendant TestM O T E P E N D a N T S T R E M O T EInput Contactor Test Current Detect TestP U T C O N T a C T O R I S T D E T E C T E D P U T C O N T a C T O R D E T E C T E DCircuit Diagram For Remote Pendant Electrical DiagramsWiring Diagram For MPC Module Circuit Diagram For Welding Power Source And MPC SC-182 947-B Main Assembly Parts List110 Dia Part Mkgs Description QuantityNAMEPLATE, order by model and serial number 158 078 010132 Page Page Page Page Support ServiceModel Name Serial/Style Number Purchase Date Distributor Address City State ZipMiller Electric Mfg. Co

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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