Operating Steps; Remote Control Of Machine Operation; Welding Procedure Recommendations - Lincoln Electric SVM188-A Service Manual

B-7
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.

OPERATING STEPS

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.
• 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.
OPERATION
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: 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.
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
Welding (FCAW)/MIG
B-7
(GMAW)