Miller Electric OM-842 manual E F L O W, # 0 X I N I T I a L P S = X X X

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If the Process Selector switch is in a dc output position, the choices are Start Only high frequency or Disabled high frequency.

10.When the desired choice is shown, press Right/In- crease to advance to the next display. The display shows:

# 0 X

P R E F L O W

TI M E = X X .X

11.If applicable, define the program number (see Section 5-1C). Define the shielding gas preflow time as desired.

The range for preflow is 0.0 to 25.0 seconds, in incre- ments of 0.1 seconds.

12.Press Right/Increase, and the display shows:

# 0 X

S T A R T L E V E L

TI M E = .X X X A M P S = X X X .X

13.Define the start level time and amperage as desired.

When properly used, start level eases arc starting by allowing the use of an amperage value that is higher than initial amperage for a short length of time.

The range for start level time is 0.0 to 15.0 seconds, in increments of 0.1 seconds. The range for start level amperage varies from 2.0 to 400 amperes, in incre- ments of 1.0 amperes.

14.Press Right/Increase, and the display shows: a. For Semi-Automatic 1 and 5 modes:

#

0 X

I N I T I A

L

T

I M E = X X .X A M P S = X X X .X

 

 

 

 

b.For Semi-Automatic 2, 3, and 4 modes:

#0 X I N I T I A L

A M P S = X X X .X

15.Define the initial current level time (if applicable) and amperage as desired.

The range for initial current level time is 0.0 to 25.0 sec- onds, in increments of 0.1 seconds. The range for initial current level amperage varies from 2.0 to 400 am- peres, in increments of 1.0 amperes.

16.Press Right/Increase, and the display shows:

# 0 X I N I T I A L S L O P E

TI M E = X X .X

17.Define the initial slope time as desired.

The range for initial slope time is 0.0 to 25.0 seconds, in increments of 0.1 seconds.

18.Press Right/Increase, and the display shows:

* * P U L S E M O D E I S * *

>X X <

19.Pressing Parameter Select toggles the display be- tween pulse mode On and pulse mode Off. Three possibilities exist at this point, as follows:

Pulse mode On is desired and pulses are to be defined as time spent in peak current and background current (see Step 20).

Pulse mode On is desired and pulses are to be defined as a frequency, with peak current defined as a percent- age of the total period (see Step 20).

Pulse mode Off is desired (see Step 21).

20.To define pulse mode On, proceed as follows:

a.Be sure the desired means of defining pulse mode has been selected according to Section 2-4.

b.Use the Parameter Select push button to select pulse mode On, and press Right/Increase to ad- vance to the next display while ”On” is displayed.

c.If pulses are being defined as time values, go to Section 5-3B.

If pulses are being defined as a frequency, go to Section 5-3C.

21.To define pulse mode Off, proceed as follows:

a.Use the Parameter Select push button to select pulse mode Off, and press Right/Increase while ”Off” is displayed. The display shows:

# 0 X

W E L D

A M P S = X X X .X

b.Define the weld current as desired.

The range for weld current varies from 2.0 to 400.0 amps, in increments of 1.0 amperes.

c.Press Right/Increase. Go to Section 5-3D if pro- gramming in Semi-Automatic 1 or 5 modes. Go to Section 5-3E if programming in Semi-Automatic 2, 3, or 4 modes.

B.Procedure With Pulse Mode On, Pulses Defined In Time Values

1.The display shows:

# 0 X P U L S E

A p K

= X X X .X

P U L S E

A b K

= X X X .X

 

 

 

2.Define the ApK and AbK values as desired.

ApK defines the peak current during pulsing. AbK defines the background current.

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Contents OM-842162074B ProcessesDescription 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 dangereuxLE Soudage peut provoquer un incendie ou une explosion DES Particules Volantes peuvent blesser les yeuxLE Bruit peut affecter l’ouïe ’EMPLOI Excessif peut Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser 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 Pulse signal, and for a wire feeder User Relay ContactsSetting DIP Switch SW1 Rocker Switch Settings = On = OffControls Safety EquipmentOperation Work ClampMode Selector Switch Ammeter And VoltmeterDigital Display Right/Increase Push Button Program/Run/Reset Keyed SwitchParameter Select Push Button Left/Decrease Push ButtonPurge Push Button Remote PendantShielding Gas Weld Sequence Introduction to ProgrammingGeneral Balance ControlModes Of Operation Automatic Mode SequenceSemi-Automatic Mode Sequence 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 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 XSmaw 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 % 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 DownDiagnostics Overheating ProtectionIntroduction Diagnostics Program Programming Push Button TestsRAM 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 SupportModel 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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