Lincoln Electric IM812-A manual Routine Maintenance, Circuit Protection and Automatic Shutdown

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MAINTENANCE

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SAFETY PRECAUTIONS

WARNING

Have qualified personnel do the maintenance work. Turn the engine off before working inside the machine. In some cases, it may be necessary to remove safety guards to perform required maintenance. Remove guards only when necessary and replace them when the maintenance requiring their removal is complete. Always use the greatest care when working near moving parts.

Do not put your hands near the engine cooling blower fan. If a problem cannot be corrected by following the instructions, take the machine to the nearest Lincoln Field Service Shop.

ELECTRIC SHOCK can kill.

Do not operate with covers removed.

Do not touch electrically live parts or electrode with skin or wet clothing.

•Turn the input power to the welding power source off at the fuse box before working in the terminal strip.

Insulate yourself from work and ground

Always wear dry insulating gloves.

See additional warning information throughout this operator’s manual and the Engine manual as well.

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ROUTINE MAINTENANCE

DRIVE ROLLS AND GUIDE TUBES

After feeding every coil of wire, inspect the drive roll section. Clean it as necessary. Do not use a solvent for cleaning the idle roll because it may wash the lu- bricant out of the bearing. The drive roll, idle roll and guide tubes are stamped with the wire sizes they will feed. If a wire size other than that stamped on the rolls is to be used, the rolls and guide tubes must be changed.

The drive rolls for .035 through .052 cored electrode and 1/16 through 5/64 electrode have a double set of teeth so they can be reversed for additional life. Drive rolls for .023 through .052 solid electrode and aluminum sizes have no teeth but use two grooves so they also can be reversed for additional life.

See Wire Feed Drive Roll and Guide Tube Kits Sec- tion for roll changing instructions.

WIRE REEL SPINDLE

No routine maintenance required. Do not lubricate spindle.

CONTROL BOX

Every six months open and inspect the control sec- tion. The accumulated dirt should be gently blown off all of the electrical components. Be sure the air that is being used is dry. Check that lead plugs are secure in their receptacles.

WIRE DRIVE MOTOR AND GEAR BOX

Every year examine the gear box. Paint the gear teeth with molydisulfide filled grease. Lincoln specification E2322. Do not use a graphite grease.

Check the motor brushes. Replace if they are worn down to 1/4 inch or less. When ordering feed motor b r u s h e s , g i v e a l l i n f o r m a t i o n f r o m t h e motor nameplate.

GUN AND CABLE MAINTENANCE

See IM manual provided with the gun and cable as- sembly.

CIRCUIT PROTECTION AND AUTOMATIC SHUTDOWN

CONTROL PC BOARD FUSE

On G1757-6 (or higher part no.) P.C. Boards the 1/8 amp fuse was replaced with electronic protection for trigger circuit faults to electrode circuit.

On G1757-2 through -5 part no. PC boards, the 1/8 amp fuse interrupts the 500A lead to the trigger switch. On G1757- 1 PC boards a 5 amp fuse was used to interrupt the 667 lead. The LN-35 will not operate if the fuse is blown.

AUTOMATIC PROTECTION SHUTDOWN

(See Automatic Protection Shutdown Section.)

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Contents LN-35 CV/CC Semiautomatic Wire Feeder California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéThank You Table of Contents Installation Power Source Connection Safety PrecautionsGUN Cable Connection to Feeder INVERTEC, CV300 and Other Newer Lincoln Power SourcesCV Adapter Electrode Cable Connection Drive Roll InstallationChanging Drive Rolls for TWO- Roll Wire Feeders Weld Cable ConnectionWelding Capability OperationGeneral Description Recommended Processes and EquipmentTo Mount a 50 or 60 LB Coil Wire Reel Loading 50 and 60 LBAdjustable Wire Reel Brake Work Clip LeadLoading Wire Drive Idle Roll Pressure SettingSetting Constant Wire Feed Speed CV Mode Presetting Wire Feed SpeedSetting ARC Sensing Wire Feed Speed VV CC Mode Making a Weld Figure B.4 Vvcc Wire Speed SettingProcedure AT END of Coil Overvoltage Shutdown Automatic Protection ShutdownMotor Overload Shutdown Routine Maintenance MaintenanceCircuit Protection and Automatic Shutdown Calibration of LN-35 Wire Speed Dial Adjusting Speed Sensor ModuleHOW to USE Troubleshooting Guide TroubleshootingContact your local Lincoln Your local Lincoln Authorized Wiring Diagram LN-35 DiagramsLN-35 Precaucion Warnung