Miller Electric OM-842 manual Weld/Peak, Initial Current C Final Slope Current B Current D Preflow

Page 22

 

Weld/Peak

Initial

Current C Final

Slope

Slope

Initial

Final

Current B

Current D

Preflow

Postflow

A

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

B:Momentary closure of Start/Increase push button ends initial current.

C:Momentary closure of Start/Increase push button ends weld/peak cur- rent.

D:Momentary closure of Start/Increase push button ends final current.

Preflow: Time programmed/Volume set by gas meter.

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

Initial Current: Time undefined/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 undefined/Level programmed.

Postflow: Time programmed/Volume set by gas meter.

Weld/peak current cannot 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, weld/peak current, and final current. The micro- processor control operates in a mo- mentary-contact, single button for- mat. The operator presses the Start/ Increase push button to start the pro- gram, presses it again to signal the end of initial current, presses it again to signal the end of weld/peak cur- rent, and presses it for a last time to signal the end of final current.

The weld amperage cannot be in- creased or decreased once the se- quence has started.

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 4-2. Semi-Automatic 2 Mode Sequence

Weld/Peak

Initial Current C Final

SlopeSlope

Initial

Final

 

Current B

Current

D

Preflow

 

 

Postflow

A

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

B:Release of Start/Increase push button ends initial current.

C:Maintained closure of Start/Increase push button ends weld/peak cur- rent.

D:Release of Start/Increase push button ends final current.

Preflow: Time programmed/Volume set by gas meter.

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

Initial Current: Time undefined/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 undefined/Level programmed.

Postflow: Time programmed/Volume set by gas meter.

Weld/peak current cannot 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, weld/peak current, and final current. The micro- processor control operates in a maintained-contact, single button format. The operator presses and holds the Start/Increase push button to start the sequence. The Start/In- crease push button is released to signal the end of initial current. The sequence will then cycle through to weld/peak current. The operator presses and holds the Start/In- crease push button to signal the end of weld/peak current. The sequence will then cycle through to final cur- rent. The Start/Increase push button is released to signal the end of final current.

The weld amperage cannot be in- creased or decreased once the se- quence has started.

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 4-3. Semi-Automatic 3 Mode Sequence

OM-842 Page 18

Page 21 Page 23
Image 22
Page 21 Page 23
Contents Processes OM-842162074BDescription From Miller to You Table of Contents Page Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion Buildup of GAS can injure or killPrincipal Safety Standards EMF Information About PacemakersUN Choc É Lectrique peut tuer Signification des symbolesConsignes DE Securite Lire Avant Utilisation LES Fumé ES ET LES GAZ peuvent ê tre dangereuxDES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer un incendie ou une explosionLE Bruit peut affecter l’ouïe ’EMPLOI Excessif peut Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresInformation sur les champs é lectromagné tiques Principales normes de sé curitéConsignes relatives aux stimulateurs cardiaques Connecting Remote Pendant Or Equivalent User-Wired Control InstallationRemote 4 Socket Information Pulse signal, and for a wire feeder User Relay ContactsSetting DIP Switch SW1 Rocker Switch Settings = On = OffControls Safety EquipmentOperation Work ClampAmmeter And Voltmeter Mode Selector SwitchDigital Display Right/Increase Push Button Program/Run/Reset Keyed SwitchParameter Select Push Button Left/Decrease Push ButtonRemote Pendant Purge Push ButtonShielding Gas Weld Sequence Introduction to ProgrammingGeneral Balance ControlModes Of Operation Automatic Mode SequenceSemi-Automatic Mode Sequence Start Level Not Shown Time & level programmedInitial Current C Final Slope Current B Current D Preflow Weld/PeakWeld/Peak Initial Current C Final SlopeSlope Current B Semi-Automatic 4 Mode Sequence Weld/Peak Initial C Current D Final SlopeSlope Current BPreflow Postflow Smaw ModeWeld/Peak Initial Current B Final Slope Slope Initial Slope Weld/Peak Current Final Slope Final CurrentProgramming Automatic Mode Procedure Up To Pulse Mode SelectionProcedure With Pulse Mode On, Pulses Defined In Time Values N a L Procedure With Pulse Mode On, Pulses Defined As a FrequencyProcedure Following Pulse Mode Definition S T F L O WO P Semi-Automatic ModeA R T 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 O P B U T T O N D E T E C T X X X X X X XManual Gtaw Mode R R E N T C O N T R O L X X X XEditing a Program Smaw Mode# 0 X a R C C O N T R O L R C E N T a G E = 0 0 0 % Linking Programs Dry Run FeatureStop Watch Feature N K P O S I T I O N X X X X X X XO G R a M L I N K M O D E Combining ProgramsM B I N E 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 XSequence of Operation Gas Tungsten Arc Welding Gtaw In The Automatic ModeShared Initial Procedure Gas Tungsten Arc Welding Gtaw In The Semi-Automatic ModesOperation Procedures For Semi-Automatic 3 Mode Operation Procedures For Semi-Automatic 1 ModeOperation Procedures For Semi-Automatic 2 Mode Operation Procedures For Semi-Automatic 4 ModeGas Tungsten Arc Welding Gtaw In The Manual Mode Operation Procedures For Semi-Automatic 5 ModeExecuting Combined Programs Shielded Metal Arc Welding SmawExecuting Linked Programs Shutting DownOverheating Protection DiagnosticsIntroduction Programming Push Button Tests Diagnostics ProgramRAM Test Program/Run/Reset Keyed Switch Tests Repeating Test DisplaysOutput Selector Switch Test Mode Selector Switch TestPurge Push Button Test 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 R G E B U T T O N S T+10 Volt DC Reference Test Gas Solenoid Relay Test Background Relay TestArc Starter Relay Test User RelaysR E M O T E Remote Pendant TestM O T E P E N D a N T S T S H D E C R E a S E B U T T O N R E M O T ECurrent Detect Test Input Contactor TestP U T C O N T a C T O R D E T E C T E D P U T C O N T a C T O R I S T D E T E C T E DElectrical Diagrams Circuit Diagram For Remote PendantWiring Diagram For MPC Module Circuit Diagram For Welding Power Source And MPC SC-182 947-B Parts List Main Assembly078 010 Dia Part Mkgs Description QuantityNAMEPLATE, order by model and serial number 158 110132 Page Page Page Page Service SupportDistributor Address City State Zip Model Name Serial/Style Number Purchase DateMiller 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.
Top Page Image Contents