Lincoln Electric SVM188-A service manual NA-3 Automatic Wire Feeder, Remote

B-8 OPERATION B-8

NA-3 AUTOMATIC WIRE FEEDER

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1.Set the DC-600 LOCAL/REMOTE Switch to REMOTE. Set the OUTPUT TERMINALS switch to REMOTE. NOTE: Later model NA-3 automatic wire feeders are capable of cold starts when the NA-3 Mode switch is in the CV or CC mode position. Some earlier models are capable of cold starting only in the CC mode position. Cold starting enables you to inch the wire down to the work, automatically stop, and automatically energize the flux hopper valve.

2.Connect the NA-3 Control Cable to the 14 pin Amphenol of the DC-600.

3.Connect the #21 work lead (on T.S.2) to the same polarity as the work cable connection or follow instructions on the Connection Diagram (S22978) for remote connection (recommend- ed) of the #21 lead.

4.Connect the electrode cables to terminal polarity to be used.

5.Set the DC-600 welding mode switch for the desired process: CV SUBMERGED ARC, CV INNERSHIELD mode or CC STICK mode.

6.Set the NA-3 mode Switch Position to either CV or CC to match the DC-600 mode selected in step 2.

7.Refer to the NA-3 operators manual for instructions on how to use the NA-3 in conjunction with the DC- 600.

8Follow the following guidelines for good arc striking detailed below for each welding mode.

DC-600 POWER SOURCE SETTING WHEN CONNECTED TO NA-5 WIRE FEEDER

When using the DC-600 with the NA-5 wire feeder, set the controls on the DC-600 as follows for the best per- formance:

1.Turn OFF main AC input power supply to the DC- 600.

2.Connect the NA-5 Control Cable to the 14 pin Amphenol of the DC-600.

3.Connect the #21 work lead (on T.S.2) to the same polarity as the work cable connection or follow instructions on the Connection Diagram (S22979) for remote connection (recommend- ed) of the #21 lead.

4.Connect the electrode cables to terminal polarity to be used.

5.Connect the #21 work lead (on T.S.2) to the same polarity as the work cable connection.

6.Set the DC-600 LOCAL/REMOTE Switch to

REMOTE.

7.Set the DC-600 OUTPUT TERMINALS switch to

REMOTE.

8.Set the DC-600 WELDING MODE SWITCH to the position that matches the welding process being used.

•For submerged arc welding, set WELDING MODE SWITCH to CV SUBMERGED ARC position.

•For all open arc welding processes set WELDING MODE SWITCH to CV INNERSHIELD position.

GOOD ARC STRIKING GUIDELINES FOR THE DC- 600 IN THE CV INNERSHIELD, CV SUBMERGED ARC MODES

Following are some basic arc striking techniques that apply to all wire feed processes. Using these proce- dures should provide trouble-free starting. \These pro- cedures apply to single, solid wires and Innershield wires.

1.Cut the electrode to a sharp point.

2.Set the NA-3 Open Circuit Voltage Control (NA-5 STRIKE VOLTS Control) to the same dial setting as the Arc Voltage Control. For the NA-3, If this is a new welding procedure, a good starting point is to set the Open Circuit Voltage Control to # 6.

NOTE: The open circuit voltage of the DC-600 varies from approximately 16 volts to 56 volts in the CV INNERSHIELD or CV SUBMERGED ARC modes. The open circuit volt- age is constant in the CC STICK mode.

DC-600