Miller Electric OM-842 manual Current Detect Test, Input Contactor Test

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7.If the Decrease push button is not pressed in time, or if the Decrease push button is not working correctly, the display shows:

B U T T O N I S N O T

W O R K I N G P R O P E R L Y

If the Decrease push button is not working correctly, re- place the push button.

8.When the Decrease push button tests okay, press Pa- rameter Select. The display shows:

P U S H S T O P B U T T O N

O N R E M O T E

9.When this display appears, the control unit waits three seconds for the Stop push button to be pressed. If this is done in time and the push button is working correctly, the display shows:

B U T T O N I S

W O R K I N G P R O P E R L Y

If the Stop push button tests okay, go to Step 11.

10.If the Stop push button is not pressed in time, or if the push button is not working correctly, the display shows:

B U T T O N I S N O T

W O R K I N G P R O P E R L Y

If the Stop push button is not working correctly, replace the push button.

11.When the Stop push button tests okay, press Parame- ter Select to exit the Remote Pendant tests. Use the Right/Increase or Left/Decrease push button to access another test, or stop the diagnostics program.

O.Current Detect Test

This procedure tests the operation of the circuitry that detects output current flow.

1.When the repeating test displays are shown (see Sec- tion 7-2C), press Right/Increase or Left/Decrease until the display shows:

2.Press Parameter Select. The display scrolls through the following two displays:

P U T S H O R T C I R C U I T

O N O U T P U T S T U D S

R I G H T

/ I N C T O

C O N T I N U E

T H I S T E S T

 

 

3.Connect a suitable cable across the output terminals. The microprocessor control sends a reference current through the cable when Right/Increase is pressed.

4.Press Right/Increase. If the current detect circuitry is working correctly, the display shows:

C U R R E N T D E T E C T I S W O R K I N G P R O P E R L Y

If the current detect circuitry tests okay, go to Step 6.

5.If the current detect circuitry is not working correctly, the display shows:

C U R R E N T D E T E C T I S

N O T W O R K I N G P R O P E R L Y

If the current detect circuitry is not working correctly, contact the nearest Factory Authorized Service Station/Service Distributor.

6.When the current detect circuitry tests okay, press Pa- rameter Select to exit the test. Use the Right/Increase or Left/Decrease push button to access another test, or stop the diagnostics program.

P.Input Contactor Test

This procedure tests the circuitry that detects an input contac- tor closure.

1.When the repeating test displays are shown (see Sec- tion 7-2C), press Right/Increase or Left/Decrease until the display shows:

I N P U T C O N T A C T O R

T E S T

2.Press Parameter Select to begin the test. The display shows:

C U R R E N T D E T E C T

T E S T

P R O V I D E A C L O S U R E O N R C 3 P I N S A T O B

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Contents Description OM-842162074BProcesses 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 Bruit peut affecter l’ouïe LE Soudage peut provoquer un incendie ou une explosionDES Particules Volantes peuvent blesser les yeux ’EMPLOI Excessif peut Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresConsignes 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 Pulse signal, and for a wire feeder User Relay ContactsSetting DIP Switch SW1 Rocker Switch Settings = On = OffControls Safety EquipmentOperation Work ClampDigital Display Mode Selector SwitchAmmeter And Voltmeter Right/Increase Push Button Program/Run/Reset Keyed SwitchParameter Select Push Button Left/Decrease Push ButtonShielding Gas Purge Push ButtonRemote Pendant 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 SlopeSlope Current B Weld/PeakInitial Current C Final Slope Current B Current D Preflow 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 X# 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 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 DownIntroduction DiagnosticsOverheating Protection RAM Test Diagnostics ProgramProgramming Push Button Tests 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 SupportMiller 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.
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