Na-3 Automatic Wire Feeder - Lincoln Electric SVM188-A Service Manual

B-8

NA-3 AUTOMATIC WIRE FEEDER

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.
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 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.
8 Follow 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.
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
(S22979) for remote connection (recommend-
ed) of the #21 lead.
OPERATION
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
DC-600 varies from approximately 16 volts to 56
volts in
SUBMERGED ARC modes. The open circuit volt-
age is constant in the CC STICK mode.
DC-600
open circuit voltage
the CV INNERSHIELD
B-8
of the
or CV