Operating Steps

B-7

OPERATION

B-7

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The power source circuitry is protected from faults on leads 75, 76, or 77. If any of these leads are connect- ed to either the positive or negative output leads, the DC-600 will either shut down completely (input contac- tor opens and white POWER light stays illuminated), or will operate at minimum output thus preventing any damage to the DC-600. If DC-600 shuts down, it must be manually started by resetting the POWER ON/OFF toggle switch.

The following procedures are for using the DC-600 in the local control mode of operation. For remote control of the machine, see the Remote Control of Machine Operation section.

Before operating the machine, make sure you have all materials needed to complete the job. Be sure you are familiar with and have taken all possible safety precau- tions before starting work. It is important that you fol- low these operating steps each time you use the machine.

1.Turn on the main AC power supply to the machine.

2.Connect the #21 work lead to either + or - on ter- minal strip (T.S.2).

3.Set the Welding Mode switch to welding process being used:

•CC STICK (for SMAW and AAC)

•CV SUBMERGED ARC (for SAW)

•CV INNERSHIELD (for FCAW and GMAW)

4.Turn the POWER ON/OFF Toggle Switch to the “ON” position

•The white pilot light glows.

REMOTE CONTROL OF MACHINE OPERATION

The toggle switch on the control panel labeled “Remote

-Panel” gives the operator the option of controlling the machine output from a remote location. If in the Remote position a wire feeder with remote control capabilities or a remote control device such as a K775 must be connected to terminals 75, 76, and 77. Refer to Accessories Section for wire feeder remote informa- tion.

WELDING PROCEDURE

RECOMMENDATIONS

Select Welding Mode Switch position based on type of welding to be done.

1. Innershield Welding (FCAW)/MIG (GMAW) Welding: Use the CV INNERSHIELD mode.

2.Submerged Arc Welding (SAW): Use the CV SUB- MERGED ARC mode. If performing high speed welding, switch between the CV Submerged Arc and the CV Innershield mode and use the mode that produces the best welding results.

3.Air/Carbon Arc Cutting (AAC) / Stick Welding (SMAW) / High Current, Large Puddle Submerged Arc Welding (SAW): Use the CC STICK mode. When the DC-600 is used for Air/Carbon Arc cut- ting, the OUTPUT CONTROL potentiometer should be set to "9" initially. Based on the size of the carbon being used or the process, turn the potentiometer to a lower setting as required by the process. You can use carbon rods up to 3/8" in diameter at currents as high as 750 amps with excellent arc control. The welder protection circuit protects the machine from extremely high short cir- cuiting pulses.

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• The fan starts.

5.Set OUTPUT CONTROL Potentiometer to desired voltage or current.

6.Set the OUTPUT TERMINALS switch to either “ON” ( output terminals energized) or “REMOTE” (output terminals energized when #2 and #4 closed by remote device such as wire feeder)

7.Make the weld.

SEMI-AUTOMATIC AND AUTOMATIC WIRE FEEDING WITH THE DC-600 AND WIRE FEEDERS

When using the DC-600 with semi-automatic or auto- matic wire feeding equipment and for stick welding or air/carbon arc cutting, it is recommended that the optional MULTI-PROCESS SWITCH be used. This switch permits you to easily change the polarity of the connected wire feeding equipment or switch to stick welding or air/carbon arc cutting.

DC-600