Lincoln LN-742H manual Controls and Settings, Figure B.1 Wire Feeder Controls

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B-2

OPERATION

B-2

 

 

 

0.045 to 5/64 in. (1.2 to 2.0 mm) cored wire for Innershield processes.

The LN-742H is capable of the following wire feed ranges:

0.025 to 0.045 in. (0.6 to 1.2 mm) solid wire for gas- metal-arc or CV submerged arc processes.

0.035 to 0.045 in. (1.2 mm) cored wire for Outershield, Metalshield or Innershield processes.

CONTROLS AND SETTINGS

The operator controls are located on the keypad shown in Figure B.1. The keypad consists of: 7 membrane keys with tactile-feel embossed domes, that are generously spaced to provide easy selection, even while wearing welding gloves; a long-life, 3-1/2 digit, 7 segment LED display with 0.56 in. (14.2 mm) character height, permitting easy viewing even from long gun cable distances; and high intensity, red, LED indicator lights that allow for viewing at almost any angle.

TRIGGER MODE CONTROLS. This control enables the operator to choose the mode of operation as shown by the indicator lights. Pressing the key causes the mode lights to sequence (from top to bottom).

The top light indicates standard (two-step) trigger mode. In this mode the unit will only be active when the trigger is pressed. The middle light indicates lock (four-step) trigger mode. In this mode the solenoid is energized when the trigger is pressed, the power source and wire feeder are energized after preflow time when the trigger is released. Closing the trigger a second time turns off the wire feeder and then the power source after burnback time. Releasing the trigger a second time turns off the solenoid after Burnback time. The bottom light indicates spot weld trigger mode. Closing the trigger allows a single, timed, weld cycle. The duration of the weld cycle is set with the time selection controls. The spot on timer starts when welding current flows.

TIME SELECTION CONTROLS. This control enables the operator to choose which timer will be displayed as shown by the indicator lights. Pressing the key causes the mode lights to sequence (from top to bottom). Any timers not available to the currently selected mode will be skipped. Times displayed in the LED display are adjusted using the setting adjustment arrows to the left of the LED display. The top left light indicates the preflow time is being displayed in seconds. The top right indicator light indicates the postflow time is being displayed in seconds. The middle light indicates the burnback time is being displayed in seconds. The bottom light indicates the spot weld time is being displayed in seconds.

FIGURE B.1 – WIRE FEEDER CONTROLS.

COLD

 

 

 

GAS

INCH

 

 

 

PURGE

KEY

 

 

 

KEY

 

COLD INCH

GAS PURGE

 

SETTING

 

 

 

LED

ADJUSTMENT

 

 

 

 

 

 

DISPLAY

ARROW KEYS

 

OLTMETER

 

 

 

 

 

 

 

INCH

 

 

 

 

WFS

FUNCTION

 

 

 

 

 

 

 

 

SELECTION

 

 

 

 

CONTROLS

 

TRIGGER MODE

TIME

 

 

 

PREFLOW

POSTFLOW

 

 

STD

t1

t2

TIMER

 

 

 

 

 

LOCK

t

BURNBACK

SELECTION

TRIGGER

 

 

 

SPOT

t

SPOT

CONTROLS

MODE

 

 

 

 

CONTROLS

 

t

 

 

 

 

 

 

LN-742 & LN-742H

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Contents LN-742 & LN-742H Wire Feeders Safety California Proposition 65 WarningsElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Sûreté Pour Soudage a L’ArcThank You Table of Contents Installation Technical Specifications LN-742Mounting Location Input Cable ConnectionsFigure A.2 Strain Relief Clamp PIN Table A.1 Work Lead Specifications Work CableGUN and Cable Assemblies GUN Cable ConnectionsWater Connections For Water Cooled Guns Figure A.5 Water ConnectionsGmaw Shielding GAS Hookup Figure A.6 Shielding GAS HookupSafety Precautions OperationOperating Instructions General DescriptionControls and Settings Figure B.1 Wire Feeder ControlsAcceleration Setting Drive Roll InstallationChanging Drive Rolls for TWO- Roll Wire Feeders English or Metric Speed Display UnitsGuide Tube Detail Changing Drive Rolls for FOUR- Roll Wire Feeders Figure B.3 Installing Drive Rolls on a FOUR-ROLL Feeder Idle Roll Pressure Setting Figure B.4 Idle Roll Pressure SettingWire Loading Figure B.5a Threaded Locking CollarElectrode Feeding and Brake Adjustment Innershield CoilsAdjustable Wire Reel Brake To Mount a 50 or 60 LB CoilREADI-REELS a K438 READI-REEL Adapter Must be Used Figure B.7 K1504-1 Coil ReelWire Reel Changing Making a WeldTable C.1 LN-742 Accessories AccessoriesGeneral K589-1 Remote Control KIT K163 UndercarriageK178-1 Mounting Platform Solenoid KITPower Input Cables Welding GunsSPINDLES, STANDS, Adapters Attaching the Wire Reel Stand Drive Roll Kits Table C.2 Drive Roll KIT NumbersRoutine Maintenance MaintenancePeriodic Maintenance Troubleshooting HOW to USE Troubleshooting GuideTroubleshooting Troubleshooting Troubleshooting Troubleshooting Troubleshooting Troubleshooting Diagrams LN-742 & LN-742H LN-742 & LN-742H LN-742 & LN-742H LN-742 & LN-742H Precaucion Warnung

LN-742, LN-742H specifications

The Lincoln LN-742H and LN-742 are renowned models in the realm of industrial welding equipment, specifically designed to cater to the needs of professional welders and fabricators. These machines stand out for their robustness, advanced technology, and ease of use, making them popular choices in various industries, including construction, automotive, and manufacturing.

One of the main features of the Lincoln LN-742H and LN-742 is their powerful Arc control capabilities. The machines are equipped with innovative technology that allows for consistent arc stability, which is crucial for achieving high-quality welds. The adjustable arc force enables users to tailor the welding parameters to their specific applications, facilitating optimal penetration and minimal spatter.

The LN-742H model is particularly notable for its enhanced portable design, making it easier for operators to transport the machine to different job sites. This portability does not compromise its power, as it offers a high output suitable for both thin and thicker materials. Moreover, the LN-742 model comes with a highly efficient cooling system that ensures the machine runs smoothly without overheating, even during prolonged use.

Both models feature an intuitive user interface that simplifies the welding process. The digital display offers real-time feedback on the welding parameters, allowing welders to make precise adjustments as needed. This feature is especially beneficial for beginners, who may be unfamiliar with optimal welding settings.

Another impressive characteristic of the Lincoln LN-742H and LN-742 machines is their versatility. They support various welding processes, including MIG, TIG, and stick welding, giving users the flexibility to choose the most suitable method for their projects. This adaptability makes these models an ideal solution for shops that handle a wide range of welding tasks.

Durability is a significant consideration in the design of the LN-742H and LN-742, as they are built with high-quality materials that withstand heavy use and challenging conditions. The rugged construction extends the lifespan of the machines, reducing the need for frequent repairs and servicing.

In summary, the Lincoln LN-742H and LN-742 welding machines exemplify advanced engineering and user-focused design. Their combination of powerful performance, portability, user-friendly features, and versatile applications makes them essential tools for professionals in the welding industry, paving the way for excellence in metal fabrication and repair.