Lincoln Electric SVM 122-A service manual Figure C.11 Idealarc DC-400/LN-742 Connection Diagram

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CONNECTING THE LN-742 TO THE IDEALARC DC-400 (14-PIN AMPHENOL)

1.Disconnect main AC input power to the Idealarc DC-400.

2.Set the POWER toggle switch to the OFF (0) posi- tion.

3.Connect the electrode cable from the LN-742 to the “+” terminal of the welder. Connect the work cable to the “-” terminal of the welder. Reverse this hookup for negative polarity. See Figure C.11.

NOTE: Welding cable must be sized for the current and duty cycle of the application.

4.Connect the K592 Control Cable to the 14-pin amphenol on the IDEALARC DC-400 and to the input cable plug on the LN-742. See Figure C.11.

5.Set the welder VOLTMETER switch to the desired polarity, either DC (-) or DC (+).

6.Set the MODE switch to a CV (constant voltage) position.

7.Adjust wire feed speed at the LN-742 and set the welding voltage with the output ARC CONTROL to a CV (constant voltage) position at the welder.

NOTE: If optional remote control is used, set the OUTPUT CONTROL switch to the “Remote” position and the OUTPUT TERMINALS switch to the “Remote” position.

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FIGURE C.11 – IDEALARC DC-400/LN-742 CONNECTION DIAGRAM

IDEALARC DC-400

LINCOLN ®

ELECTRIC