Lincoln Electric DC-600 series Operator's Manual page 24

B-8
NOTE: These Start Board current and voltage set-
tings result in a start up current that is lower than
the NA-3 current setting and approximately equal
with the NA-3 voltage setting for the desired weld-
ing procedure.
6. Establish the correct arc striking procedure with
the NA-3 Start Board timer set at maximum.
• For the best starting performance, the NA-3 Open
Circuit Voltage Control and Voltage Control set-
ting 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
voltage and then returns back to the desired volt-
age, 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 elec-
trode to stub.
• Set NA-3 Start Board current and voltage as
close to the welding procedure current and volt-
age as possible.
NOTE: The Start Board current and voltage
should be as close as possible to the welding pro-
cedure current and voltage, while still getting sat-
isfactory starts.
• Set the start time to as low a time as possible
while still getting satisfactory starts.
7. Start and make the weld.
OPERATION
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 electrode cables to terminal polarity
to be used.
3. Connect the #21 work lead (on T.S.2) to the
same polarity as the work cable connection.
4. Set the DC-600 LOCAL/REMOTE Switch to
REMOTE.
5. Set the DC-600 OUTPUT TERMINALS switch to
REMOTE.
6. 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.
DC-600
B-8