Setting for CV or CC Power Sources

B-6	OPERATION	B-6
	OPERATION

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7.Install the large ingoing guide into the rear brass block and tighten the locking screw.

8.Install the outgoing guide tube with its plastic insert through the front brass block. Tighten the locking screw so the dog point goes into the groove on the O.D. of the guide tube.

9.Set the drive roll spring pressure:

a.For wire sizes from 0.030 thru 0.052 in. (0.8 thru 1.3 mm) – With wire in the system, the idle roll pressure indicator should be set to the wire size shown on the “solid” side of the nameplate. (For 0.030 in. (0.8 mm) solid wire, set the pressure indicator to slightly less than the 0.035 in. (0.9 mm) marking.) This setting is a starting point and may have to be changed depending upon the type of wire, surface condition, lubrication, and hardness. The optimum idle roll setting can be deter- mined when there are wire stoppages. If the wire “bird nests” between the drive roll and the guide tube, the idle roll spring pressure is too high. When properly set, the drive rolls will slip during a stoppage. If the electrode is removed from the cable, there will be a slight waviness in the electrode for about a foot beyond the slip marks on the electrode. If there is no waviness, the pressure is set too low.

b.For 1/16 in. (1.6 mm) solid or 0.062 in. (1.6 mm) cored wire (using the 1/16 in. drive roll) The idle roll pressure should be set with wire in the system. For 1/16 in. (1.6 mm) solid wire, the indicator should be lined up with the “solid” 1/16 in. mark. For 0.062 in. (1.6 mm) cored wire, adjust the idle roll pres- sure so that the indicator is lined up with the “cored” 3/32 in. mark.

NOTE: These indicator settings are accurate enough so that there is no need to readjust unless the elec- trode is unusually soft.

c.For wire sizes from 0.068 thru 0.120 in. (1.7 thru 3.0 mm) Idle roll pressure should be set with wire in the system. For solid wire, the indicator should be lined up with the “solid” wire settings. For cored wire, the indicator should be lined up with the “cored” wire set- tings. When using 7/64 in. (2.8 mm) diameter ‘Innershield’ wire, adjust the idle roll pressure so that the indicator is between the 0.120 and 3/32 in. “cored” wire setting.

NOTE: The indicator settings for these larger wire sizes are accurate enough so that there is no need to readjust, unless the electrode is unusually soft.

The drive rolls are stamped with the wire size for which they are designed. If a wire size is used that is not stamped on the drive roll, the drive rolls and guide tubes will have to be changed.

The LN-8N and LN-8NE weld only with a constant voltage (CV) power source. These machines can be converted for constant current (CC) welding by installing the proper parts.

The LN-8S and LN-8SE weld with either a CV or CC power source. Set the equipment for either “CV” or “CC” as appropriate per the following:

1.If using a multi-process power source, set it up per the instructions in the operating manual shipped with the power source.

2.Turn the input power off and open the left panel. Set the “CV-CC” switch located on the variable voltage PC board inside the control box as shown in Figure B.4.

3.There are two nameplates on top of each other on the front of the wire feeder control box. Make sure the correct nameplate for the power source being used is on top.

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OPERATION

SETTING FOR CV OR CC POWER SOURCES

LN-8