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

Page 23

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

Page 22 Page 24
Image 23
Page 22 Page 24
Contents Description OM-842162074BProcesses 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 Bruit peut affecter l’ouïe LE Soudage peut provoquer un incendie ou une explosionDES Particules Volantes peuvent blesser les yeux DES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peutConsignes relatives aux stimulateurs cardiaques Principales normes de sé curitéInformation sur les champs é lectromagné tiques Remote 4 Socket Information InstallationConnecting Remote Pendant Or Equivalent User-Wired Control User Relay Contacts Pulse signal, and for a wire feederRocker Switch Settings = On = Off Setting DIP Switch SW1Work Clamp Safety EquipmentOperation ControlsDigital Display Mode Selector SwitchAmmeter And Voltmeter Left/Decrease Push Button Program/Run/Reset Keyed SwitchParameter Select Push Button Right/Increase Push ButtonShielding Gas Purge Push ButtonRemote Pendant 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 SlopeSlope Current B Weld/PeakInitial Current C Final Slope Current B Current D Preflow 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 L# 0 X a R C C O N T R O L R C E N T a G E = 0 0 0 % Smaw ModeEditing a Program 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 ProgramsIntroduction DiagnosticsOverheating Protection RAM Test Diagnostics ProgramProgramming Push Button Tests 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 ServiceMiller Electric Mfg. Co Model Name Serial/Style Number Purchase DateDistributor Address City State Zip

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