Lincoln Electric IM812-A Presetting Wire Feed Speed, Setting Constant Wire Feed Speed CV Mode

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B-4

OPERATION

B-4

 

 

 

 

PRESETTING WIRE FEED SPEED

The LN-35 permits accurate presetting of the desired wire feed speed, before welding, in both CV and CC wire feed modes.

SETTING CONSTANT WIRE FEED SPEED (CV MODE)

a. Set Wire Feed Mode switch to CV position.

b. Set Wire Feed dial to the desired wire feed speed on the selected calibrated dial range.

The wire speed will remain constant at the value set, independent of arc voltage changes, as long as the arc voltage does not drop below the value per the chart below for the max. wire feed speed shown:

Maximum Speed

Minimum Arc Volts

250 IPM

15V

280 IPM

17V

350 IPM

21V

SETTING ARC SENSING WIRE FEED SPEED (VV [CC] MODE)

When using a constant current (formerly variable voltage) power source, welding performance is im- proved using arc sensing wire feed speed (VV [CC] mode). In this wire feed mode the wire speed increases if arc voltage increases, and decreases if arc voltage decreases, but remains constant at any specific voltage level.

The LN-35 permits accurate VV (CC) mode presetting of the desired wire feed speed, for the desired arc voltage to be used, by setting the Wire Speed dial in the following manner before welding:

a. Set Wire Feed Mode switch to VV (CC) position.

b. Referring to the graph shown in Figure B.3:

1.Select the horizontal line representing the DE- SIRED IN/MIN. for the welding procedure. (See example arrow line for 375 in/min.)

2.Select the diagonal line representing the ARC VOLTS to be used for the welding procedure. (See example arrow line for 29 volts.)

3.Determine the vertical line representing the CC WIRE SPEED SETTING where the above two lines cross. (See example arrow line for 450.)

c.Set the Wire Speed dial to the value determined in Step (3) above (450 for example used).

The wire will feed at the DESIRED IN/MIN speed when the welding power source is set to the arc voltage to be used for the weld procedure (375 in/min. at 29V for example used).

A chart representation of the VV (CC) wire speed setting graph is shown in Figure B.4, giving the Wire Speed dial setting required for the DESIRED IN/MIN and ARC VOLTS used for the welding procedures:

FIGURE B.3 CC WIRE SPEED SETTING

LN-35

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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 PrecautionsINVERTEC, CV300 and Other Newer Lincoln Power Sources GUN Cable Connection to FeederCV 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 SettingPresetting Wire Feed Speed Setting Constant Wire Feed Speed CV ModeSetting ARC Sensing Wire Feed Speed VV CC Mode Making a Weld Figure B.4 Vvcc Wire Speed SettingProcedure AT END of Coil Automatic Protection Shutdown Overvoltage ShutdownMotor Overload Shutdown Maintenance Routine 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
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