Miller Electric OM-842 manual Manual Gtaw Mode, Procedure Up To Pulse Mode Selection

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8.Press Right/Increase. The microprocessor control will enter the Ready condition.

9.In the Ready condition the microprocessor control is ready to have another program entered or to execute a program. For information on executing a program, see Section 6.

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:

5-4. Manual GTAW Mode

NOTE

If needed, see Section 5-1B for

information on selecting and defining

 

a parameter.

 

 

 

 

 

NOTE

Weld output options, such as the use

of pulsing, high frequency, and ac or

 

dc output, affect how a program is

 

 

entered in the Manual GTAW mode.

 

Be sure to follow all applicable steps,

 

and only the applicable steps, as

 

determined by the selected options.

 

 

A.Procedure Up To Pulse Mode Selection

1.Turn on welding power source, if applicable.

2.Place the Mode Selector switch in the Manual GTAW position.

3.Place the Program/Run/Reset keyed switch in the Re- set position, and then in the Program position. The initial displays will be shown.

4.When the repeating displays (explained in Section 5-1F) are shown, press Right/Increase.

If the Process Selector switch is in the ac output posi- tion, go to Step 5. If the Process Selector switch is in a dc output position, go to Step 8.

5.The display shows:

# 0 X B A L A N C E C O N T R O L

E N = X X % E P = X X %

6.If applicable, define the program number (see Section 5-1C). Define the electrode negative value for the ac output square wave (see Section 4-3) as desired.

The range for percentage of waveform in electrode negative is 46% to 68%, in increments of 2%.

7.Press Right/Increase, and go to Step 8.

8.The display shows:

H I G H F R E Q U E N C Y

>X X X X X X X X X <

9.Press Parameter Select to display the desired choice.

If the Process Selector switch is in the ac output posi- tion, the choices are Start Only high frequency or Continuous high frequency.

# 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:

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

>X X <

15.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 16).

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 16).

Pulse mode Off is desired (see Step 17).

16.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 5-4B.

If pulses are being defined as a frequency, go to Section 5-4C.

17.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:

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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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