Lincoln Electric SP-255 manual 10OPERATION, GUN Switches, Wire Drive Roll, Wire Reel Loading

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B-10OPERATION

GUN SWITCHES

Gun Trigger Switch — Turns on arc voltage, wire feeder, and gas solenoid (except with Innershield) when closed. Also causes the screen to display the Auto or Manual screens (depending on which mode it is in), when the trigger is pulled. Turns off arc voltage, wire feeder, and gas solenoid when opened.

NOTE: If using Slow Run-In, when the trigger is pulled, the wire feeder feeds wire a low speed regard- less of the set wire feed speed until the welding arc starts or 2 seconds has elapsed. This feature enhances starting and makes it easier to set the stick- out. The 2 second limit permits high speed loading of the gun and cable. To change Run-In mode, see “Start Mode Selections” in this section.

Gun Thumbswitch (Magnum™ 250SP Only) — Used to control wire feed speed, arc voltage, or selec- tion of toggle memories 4 and 5. See IPM VOLTS key and Toggle key for control details. The increase or decrease function of the thumbswitch is the same as the center and right arrow key pairs for IPM or VOLTS setting. (See Arrow keys in “Setup Keys” section for details.)

WIRE DRIVE ROLL

The drive roll provided with the SP-255 has two grooves, one for .030-.035" (0.8-0.9 mm) solid steel electrode, and the other for .045" (1.2 mm) solid steel electrode. The welder is shipped with the drive roll installed in the .030-.035" (0.8-0.9 mm) position as indicated by the stencilling on the exposed side of the drive roll. If .045" (1.2 mm) electrode is to be used or one of the optional drive rolls is required (see Accessories section). The drive roll must be reversed or changed.

PROCEDURE FOR CHANGING DRIVE ROLL

Different wire sizes may require changing the drive roll. The applicable wire sizes are stamped on the drive roll. Dual groove rolls must be installed so the side with the proper wire size stamp faces out.

1 Turn off the power source.

2.Release the pressure on the idle roll by swinging the pressure arm off the idle roll arm.

3.Remove the wire from the drive system.

IDEALARC SP-255

4.Remove the thumbscrew from the drive roll. Turn the drive roll over or change to another roll as required. Reinstall the thumbscrew.

5.Be sure the gun liner and contact tip are properly sized for wire being used. (See Gun and Cable Maintenance section.)

WIRE REEL LOADING

MOUNTING OF 22 TO 30 LB. READI-

REELS

To mount a 22-30 Ib. (10-14 kg) Readi-Reel®pack- age using the optional Readi-Reel Adapter (K363P).

1.Remove the locking collar from the 2" O.D. spindle and mount the K363P Adapter so the spindle pin engages the hole provided in the Adapter. Replace and tighten the locking collar.

2.Rotate the spindle and adapter so the retaining spring is at the 12 o’clock position.

3.Position the Readi-Reel so that it will rotate in a counterclockwise direction (as viewed from retaining spring side of Adapter) when wire is dereeled from the top of the coil as shown below:

MOLDED ADAPTER

RETAINING SPRING

WIRE DEREELING

DIRECTION

2" O.D. SPINDLE LOCKING COLLAR

BRAKE TENSION

ADJUSTING SCREW

READI-REEL

INSIDE CAGE WIRES

4.Set one of the Readi-Reel inside cage wires on the slot in the retaining spring tab.

5.Lower the Readi-Reel to depress the retaining spring and align the other inside cage wires with the grooves in the molded adapter.

6.Slide cage all the way onto the adapter until the retain spring “pops up” fully.

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Contents Safety Depends on You Idealarc SP-255Safety California Proposition 65 WarningsElectric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcThank You Master Table of Contents for ALL Sections Section F Section DSection E AppendixINSTALLATIONA-1 Technical Specifications Idealarc SP-255Input Power and Grounding Connections 2INSTALLATIONSafety Precautions Uncrating the SP-255GUN and Cable Installation INSTALLATIONA-3Output Polarity Connection 4INSTALLATION Shielding GASOPERATIONB-1 Fumes and Gases can be dangerousWelding Capability 2OPERATIONRecommended Processes and Equipment LimitationsProcess WIRE/GAS KEY Start Mode SelectionsOPERATIONB-3 Auto KEY Procedure Keys4OPERATION Typical Auto KEY Press SequencesOPERATIONB-5 Memory KeysTypical Memory Number KEY Press Sequence Timer Keys6OPERATION Spot KEYGUN Switch Keys OPERATIONB-78OPERATION Typical Toggle KEY Press SequenceStep Trigger Interlock Keys Using 4-STEP Trigger Interlock FunctionOPERATIONB-9 Typical Activate KEY Press SequenceProcedure for Changing Drive Roll GUN SwitchesWire Drive Roll Wire Reel LoadingTo Start the Welder Idle Roll Pressure SettingOPERATIONB-11 Feeding ElectrodeMaking AN Auto Mode Weld 12OPERATIONOPERATIONB-13 14OPERATION Wire Feed Overload ProtectionExplanation of Prompting and Error Messages Welding Thermal Overload ProtectionOPERATIONB-15 Operation ACCESSORIESC-1 2ACCESSORIES ACCESSORIESC-3 Disabling Spool GUNIdealarc SP-255 Cable Cleaning MAINTENANCED-1Safety Precautions Routine Maintenance2MAINTENANCE Liner Removal ReplacementGUN Handle Disassembly MAINTENANCED-3Magnum 250SP GUN Parts and Accessories Idealarc SP-255 TROUBLESHOOTINGE-1 HOW to USE Troubleshooting GuideProblems Possible Areas Symptoms Misadjustments 2TROUBLESHOOTINGTroubleshooting Guide Authorized Field Service FacilityTROUBLESHOOTINGE-3 Authorized Field Service Facility 4TROUBLESHOOTINGContact your local Lincoln TROUBLESHOOTINGE-5 Function Problems6TROUBLESHOOTING Contact your local Lincoln Authorized Field Service FacilityWiring Diagrams SP-255 Wiring Diagram L9688 Dual VoltageWiring Diagrams Dimension Print Page Page Page Page How To Read Shop Drawings $700.00Precaucion Warnung Limited Warranty
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