Lincoln Electric SVM127-A service manual Controls and Settings

B-4 B-4

OPERATION

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CONTROLS AND SETTINGS

Operator controls for LN-9N, NE, S and SE models are shown in Figure B.1. Controls for LN-9F models are shown in Figure B.2. Refer to these figures and the fol- lowing descriptions of the controls.

ELECTRODE POLARITY SWITCH: The polarity switch is located inside the wire drive section on the LN-9 model and on the front panel of both the LN-9F2-Roll and 4-Roll control box. Set the switch to the same polarity as the electrode lead connection to the power source. If the switch is not set for the correct polarity, the wire feeder will stop welding shortly after the arc is struck. See the topic "Automatic Shutdown" later in this section of the manual.

WIRE FEED DIRECTION SWITCH: The direction switch is located inside the wire drive section on the LN-9 model and on the front panel of both the LN-9F2-Roll and 4-Roll control box. This switch permits the wire to be fed in either direction when the trigger is pressed or when using the cold inch switch feature of the K202 Burnback kit. Be sure this switch is set for forward feed when you are ready to weld.

HOT-COLD TRIGGER INTERLOCK SWITCH: This switch is located on the front rail on the LN-9 model and on the front panel of both the LN-9F2-Roll and 4-Roll control box. The three-position switch serves a dual purpose:

1."Hot-Cold" Wire Feed - In the center position the wire will be electrically cold when feeding with the gun trigger. In either the up or down positions the wire will be "hot" when feeding with the gun trigger.

2.Trigger Interlock Function - In the down position the trigger interlock will be OFF, allowing the gun trigger to function in the normal mode. This stops wire feed and welding when the trigger is released. In the up position the trigger interlock will be ON.

The trigger interlock feature functions as follows:

a)When you are not welding, the trigger will function in the normal mode, which feeds only when the trigger is closed.

b)Once the welding arc has been struck, the gun trigger may be released. Welding will continue until one of the following occurs:

•The arc is extinguished by quickly pulling the gun away from the work.

or

• The trigger is again depressed and released.

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LN-9 Wire Feeder