Miller Electric OM-842 manual Modes Of Operation, Semi-Automatic Mode Sequence

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4-4. Modes Of Operation

The microprocessor control has four modes of operation: Automatic, Semi-Automatic, Manual GTAW, and SMAW. In abbreviated form, the modes function as follows:

A. Automatic Mode Sequence

Initial

Weld/Peak

Final

Current

Slope

 

Slope

Initial

 

Final

Current

 

Current

Preflow

 

Postflow

A

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

Preflow: Time programmed/Volume set by gas meter.

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

Initial Current: Time & level programmed.

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

Weld/Peak Current: Time & level programmed.

Final Slope: Time programmed/Slope 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.

In this mode, the program controls each step of the weld sequence. Pressing the Start/Increase push button starts the sequence, with no more input required from the opera- tor.

The operator can increase or de- crease weld amperage during weld/ peak current within the defined am- perage adjustment limits (see Sec- tion 2-4). This change does not af- fect the programmed values.

Pressing the Stop push button dur- ing the weld sequence stops pro- gram execution and starts postflow.

Ref. SB-139 983

B. Semi-Automatic Mode Sequence

A program created in the Semi-Automatic mode controls certain portions of the weld sequence but requires the operator to control other portions. The Semi-Automatic mode has five variations. Which portions of the sequence the operator controls, and how the portions are controlled depends on which variation is used.

 

Weld/Peak

 

 

Initial

Current

B

Final

 

Slope

 

Slope

 

 

Initial

 

 

Final

Current

 

 

Current

Preflow

 

 

Postflow

A

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

B:Momentary closure of Stop push button ends weld/peak current.

Preflow: Time programmed/Volume set by gas meter.

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

Initial Current: Time & 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 & level programmed.

Postflow: Time programmed/Volume set by gas meter.

Weld/peak current can be increased or decreased during welding.

Stop push button functions up to the signaled end of weld/peak current.

In this mode, the end time for weld/ peak current is not defined. Pressing the Start/Increase push button starts the sequence. The program pro- ceeds through each step into weld/ peak current. The operator must sig- nal the end of weld/peak by pressing the Stop push button, at which time final slope starts.

The operator can increase or de- crease weld amperage during weld/ peak current within the defined am- perage adjustment limits (see Sec- tion 2-4). This change does not af- fect the programmed values.

Pressing the Stop push button be- fore the start of weld/peak current stops program execution and starts postflow. Pressing the Stop push button after the end of weld/peak has been signalled has no effect.

Ref. SB-139 983

Figure 4-1. Semi-Automatic 1 Mode Sequence

OM-842 Page 17

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Contents OM-842162074B ProcessesDescription From Miller to You Table of Contents Page Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killPrincipal Safety Standards About Pacemakers EMF InformationConsignes DE Securite Lire Avant Utilisation Signification des symbolesUN Choc É Lectrique peut tuer LES Fumé ES ET LES GAZ peuvent ê tre dangereuxLE Soudage peut provoquer un incendie ou une explosion DES Particules Volantes peuvent blesser les yeuxLE Bruit peut affecter l’ouïe LA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU’EMPLOI Excessif peut DES Organes Mobiles peuvent provoquer des blessuresPrincipales 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 SW1Operation Safety EquipmentControls Work ClampMode Selector Switch Ammeter And VoltmeterDigital Display Parameter Select Push Button Program/Run/Reset Keyed SwitchRight/Increase Push Button Left/Decrease Push ButtonPurge Push Button Remote PendantShielding Gas General Introduction to ProgrammingWeld Sequence Balance ControlSemi-Automatic Mode Sequence Automatic Mode SequenceModes Of Operation Start Level Not Shown Time & level programmedWeld/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 SequenceWeld/Peak Initial Current B Final Slope Slope Smaw ModePreflow Postflow Initial Slope Weld/Peak Current Final Slope Final CurrentProgramming Procedure Up To Pulse Mode Selection Automatic ModeProcedure With Pulse Mode On, Pulses Defined In Time Values Procedure Following Pulse Mode Definition Procedure With Pulse Mode On, Pulses Defined As a FrequencyN a L S T F L O WA R T Semi-Automatic ModeO P E R E M O T E T O A R T# 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 % Stop Watch Feature Dry Run FeatureLinking Programs N K P O S I T I O N X X X X X X XM B I N E M O D E Combining ProgramsO G R a M L I N K M O D E M B I N E P O S I T I O N X X I S X X X X X XShared Initial Procedure Gas Tungsten Arc Welding Gtaw In The Automatic ModeSequence of Operation Gas Tungsten Arc Welding Gtaw In The Semi-Automatic ModesOperation Procedures For Semi-Automatic 2 Mode Operation Procedures For Semi-Automatic 1 ModeOperation Procedures For Semi-Automatic 3 Mode Operation Procedures For Semi-Automatic 4 ModeOperation Procedures For Semi-Automatic 5 Mode Gas Tungsten Arc Welding Gtaw In The Manual ModeExecuting Linked Programs Shielded Metal Arc Welding SmawExecuting Combined Programs Shutting DownDiagnostics Overheating ProtectionIntroduction Diagnostics Program Programming Push Button TestsRAM Test Repeating Test Displays Program/Run/Reset Keyed Switch TestsMode Selector Switch Test Output Selector Switch TestE a S E T U R N K N O B T O W O R K I N G O P E R L YPurge Push Button Test R G E B U T T O N S T+10 Volt DC Reference Test Arc Starter Relay Test Background Relay TestGas Solenoid Relay Test User RelaysM O T E P E N D a N T S T Remote Pendant TestR E M O T E S H D E C R E a S E B U T T O N 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 ListNAMEPLATE, order by model and serial number 158 Dia Part Mkgs Description Quantity078 010 110132 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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