Power Supply To Control Box Connections; Na-3N - Lincoln Electric NA-3 Service Manual

A-7
For the NA-3NF or NA-3SF, order an appro-
priate length of the needed electrode cable.
Connect it between the contact assembly
and shunt as described previously.
FIGURE A.6 – CONTROL BOX WIRING.
TO
NOZZLE
3RD OR 4TH
CABLES PER
TABLE A.1
POWER SUPPLY TO CONTROL
BOX CONNECTIONS
Refer to Figures A.7 to A.18 for diagrams on
how to connect the control box to a particular
power source. If it is not a Lincoln Electric
power source, refer to Figure A.19 at the end
of this section.
INSTALLATION
BACK OF NA-4
TO
POWER
SOURCE
BACK OF NA-3
NA-3 AND NA-4
NOTE: All electrode cables connected to the
rear of the control
manufactured by Lincoln Electric to ensure
the terminations comply with applicable U.L.
standards for safety.

NA-3N

1. Use a constant voltage type power
source.
2. If using a multi-process power source
(SAM, SA-800, SAF-600, DC-400,
DC-600, DC-1500), be sure it is
properly set for constant voltage
welding per the instructions in the
power source operating manual.
3. Connect the input cable to the power
source exactly as specified on the
connection diagram in this section.
Include all jumpers on the terminal
strips as shown in the diagrams.
NOTE: Paralleling two power sources of the
same model may be practical. Request
bulletin E1.30 from Lincoln Electric for
instructions.
4. Connect the work leads of sufficient
size and length (per Table A.1)
between the "To Work" stud on the
power source and the work. Be sure
the connection to the work makes
tight, clean, metal-to-metal contact.
5. Connect the two electrode cables of
the input cable assembly to the left
side (when facing the front of the
control box) of the shunt/current relay
assembly located on the back of the
control box. (Refer to Table A.1)
6. Insert the polarized connector of the
control cable into the matching
receptacle on the side of the control
box.
A-7
box must be