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

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.