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Hersteller: Lincoln Dateigröße: 1.59 mb Dateiname: Unterrichtssprache:

When set on Max., the electrode feeds at more than 500” per minute and the welding current is high. If the power source is equipped with meters, the welding current can be read directly on the ammeter while welding. If the power source has no meters and the relationship between current and wire feed speed is known, current can be accurately set by measuring the wire feed speed. To measure wire feed speed disconnect the electrode cable at the power source: 1. Press the gun trigger and feed electrode for 15 seconds. 2. Measure the wire feed in inches and multiply by 4. This gives the wire feed speed in inches/minute. 3. Adjust the ‘Wire Feed Speed’ control until the desired speed is obtained. January 1976 Sec. J3.1.2 Arc Starting The LN-7 starts at a slow wire feed speed and low current and automatically accelerates quickly to the welding speed set by the ‘Wire Feed Speed’ control. The electrode should be lightly touching the work when the gun trigger is pressed. This low starting current improves the starting characteristics and minimizes skipping, stubbing, and spatter when striking the arc with both normal and Linc-Fill long stickout welding procedures. This standard feature requires no adjustment. September 1976 Sec. J3.1.3 Circuit Protection The AC input line is protected by both a circuit breaker and a fuse. The circuit breaker protects the LN-7 from moderate overloads, usually caused by excessive wire drag or other wire feeding problems. To reset the circuit breaker, push the red button on the underside of the control box. If it opens again, determine the cause of the overload. The fuse protects the LN-7 from sudden high current overloads such as a shorted motor or other short circuit conditions. Determine and correct the cause of overloading. Replace the fuse with one of the same size and type. November 1972 Sec. J3.1.4 Adjustable Wire Reel Brake The mount for standard 50 and 60 pound electrode coils includes a two position brake assembly. Generally the brake should be at the inner position (nearest to the wire reel shaft) for wire feed speeds below 400”/min. It should be at the outer position for the faster wire speeds often used when feeding small diameter electrode. To adjust the brake position, remove the wire reel. Pull the cotter pin that holds the brake shoe to the arm, move the shoe and replace the cotter pin. Do not bend the cotter pin — it is held in place by a friction fit. Machines built before November 1972 do not have an adjustable brake. See Sec. J3.1.6 for adjustment instructions for the brake on the spindle for 10-25 pound spools. November 1972 Sec. J3.1.5 Wire Reel Loading — 50 and 60 Pound Coils 1. To remove the wire reel from its shaft, grasp the spring loaded knob and pull it out. This straightens the knob so it seats into the shaft when released. Remove the reel. 2. Lay the reel flat on the floor, loosen the spinner nut and remove the cover plate. 3. Before cutting the tie wires place the coil of electrode on the reel so it unwinds as the reel rotates clockwise. A. Be sure the coil is placed so the spring loaded arms will not interfere with the later removal of the coil tie wires. (See photo.) B. When loading .035 and .045” electrode, be certain the coil is placed on the reel so the spring loaded arms -13- Operating Instructions The Lincoln Electric Company Cleveland, Ohio 44117 are at the center of the slots in the carboard coil liner. This provides the positive compression of the coil needed for trouble free wire feeding. (See photo). C. Put the cover plate on the reel so the four arms of the cover straddle and are in line with the spring loaded arm of the reel proper. pin enters one of the holes in the back side of the spool. Replace and tighten the locking knob. Be certain the wire comes off the reel in a clockwise direction. The spool should turn freely without any overrun. Adjust the brake tension with the hex head screw on the shaft hub, until the reel turns freely but with little or no overrun. 4. Tighten the cover as much as possible by hand. DO NOT hammer on the spinner nut arms. 5. Cut and remove only the tie wire holding the free end of the coil. Insert the free end into one of the holes in the cover and secure it by bending it back. Cut and remove the remaining tie wires. NOTE: Always be sure the free end of the coil is securely held while the tie wires are being cut and until the wire is feeding through the drive rolls. Failure to do this will result in “back lashing” of the coil, which may tangle the wire. A tangled coil will not feed so it must either be untangled or discarded. 6. Replace the reel on the wire feeder. Grasp the shaft knob, pull it out and swing it across the reel hub. 7. Turn the reel until the free end of the electrode is accessible. While tightly holding the electrode, cut off the bent end. Straighten the first six inches and insert it through the wire guide to the drive roEs. Press the gun trigger until th...

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