Lincoln Electric SVM188-A Service Manual page 27

B-9
3. Run a test weld. Set proper current, voltage, and
travel speed.
• For the best starting performance, the NA-3 Open
Circuit Voltage Control and Voltage Control setting
should be the same. Set the Inch Speed Control for
the slowest inch speed possible.
• To adjust the Open Circuit Voltage Control to get
the best starting performance, make repeated
starts observing the NA-3 voltmeter.
When the voltmeter pointer swings smoothly up to
the desired arc voltage, without undershooting or
overshooting the desired arc voltage, the Open
Circuit Voltage Control is set properly.
If the voltmeter pointer overshoots the desired volt-
age and then returns back to the desired voltage,
the Open Circuit Voltage Control is set too high.
This can result in a bad start where the wire tends
to "Blast off."
If the voltmeter pointer hesitates before coming up
to the desired voltage, the Open Circuit Voltage
Control is set too low.This can cause the electrode
to stub.
4. Start and make the weld.
• Cold starts. For cold starts, be sure the work
piece is clean and the electrode makes positive
contact with the work piece.
• Hot "On the Fly" starts. For hot starts, travel should
begin before the wire contacts the work piece.
ARC STRIKING WITH DC-600 AND THE NA-3 OR
NA-5 START BOARD
When electrical stickout exceeds 1 3/4" (44.4mm) the
optional Start Board (K221 for the NA-3 and K334 for
the NA-5) may be required to improve arc striking.
See the NA-3 or NA-5 Operator's Manual for detailed
instructions on setting the Start Circuit controls.
LN-8 OR LN-9 SEMI-AUTOMATIC WIRE
FEEDER
To use the LN-8 or LN-9 Semi-Automatic Wire Feeder
with the IDEALARC DC-600
1. Set the IDEALARC DC-600 WELDING MODE
SWITCH to either CV Innershield mode or CV
Submerged Arc mode depending on the welding
process being used.
OPERATION
2. Connect the LN-8 or LN-9 Control Cable to the 14
pin Amphenol of the DC-600.
Connect the #21 work lead (on T.S.2) to the
3.
same polarity as the work cable connection or
follow instructions on the Connection Diagram
(S22977) for remote connection (recommend-
ed) of the #21 lead.
4. Connect the electrode cables to terminal polarity to
be used.
2. Set the
CONTROL SWITCH to the REMOTE position.
3. Set the LN-8 Welding Mode Switch to the CV or
VV position. The LN-8 Welding Mode Switch is
located on the variable voltage (CC) board.
4. Refer to the LN-8 Operator's Manual for instruc-
tions on how to use the LN-8 in the CC (VV) mode.
LN-7 AND OTHER CONSTANT WIRE
FEEDERS
To use the LN-7 or other constant wire feed speed
semi-automatic wire feeders with IDEALARC DC-600
1. Set the IDEALARC DC-600 WELDING MODE
SWITCH to either CV Innershield mode or CV
Submerged Arc mode depending on the welding
process being used.
2. Connect the Wire Feeder Control Cable to the 14
pin Amphenol of the DC-600.
Connect the #21 work lead (on T.S.2) to the
3.
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
CONTROL SWITCH per the Connection Diagram
for the feeder being used
NOTE: Older Lincoln control cables that do not have an
Amphenol connector on the Power Source end
can be connected to the T.S.1 & T.S.2 terminal
strips behind the DC-600 nameplate. See the
Installation section of this manual and the
appropriate Connection Diagram.
DC-600
IDEALARC DC-600
IDEALARC DC-600
B-9
OUTPUT
OUTPUT