Electrical Installation; Input Power Requirements; Control Box To Welding Head Connections - Lincoln Electric NA-3 Service Manual

A-6
When mounting the welding head to the
standard travel carriage, (see IM278 sec.
L2.2.4) mount it so only a minimum of
overhang weight exists. Mount the head so
it stays within the dimension shown in Figure
A.5.
FIGURE A.5 – MOUNT TO CARRIAGE
ELECTRICAL
INSTALLATION
This section provides information on proper
wiring procedures for the NA-3 and NA-4
welding systems. This section also provides
INSTALLATION
OVERHANG DIMENSION.
19 IN.
(483 MM)
WARNING
ELECTRIC SHOCK
can kill.
• Do not touch electrically
live parts such as output
terminals or internal
wiring.
NA-3 AND NA-4
basic connection diagrams for connecting
automatic welding systems to various
welding power sources.

INPUT POWER REQUIREMENTS

350 volt-amperes of 115 VAC 50/60 Hz
power is required for the wire feed motor and
controls. Another 250 volt-amperes may be
required depending on the travel circuit.
CONTROL BOX TO WELDING
HEAD CONNECTIONS
NOTE: All electrode cables connected to the
rear of the control
manufactured by Lincoln Electric to ensure
the terminations comply with the applicable
U.L. standard for safety.
All welding heads include a 4 ft (1.2 m)
motor cable, and when applicable, a 4 ft (1.2
m) flux hopper cable. Insert the plug on this
cable into the matching receptacle on the
side of the control box. If the 4 ft (1.2 m)
cable is not sufficient, install the separate
extension cable assembly at the length
ordered, up to 75 ft (22.8 m). The extension
cable has plugs on both ends for easy
installation.
The NA-3 and NA-4 also include two
4 ft (1.2 m) lengths of electrode cable. Bolt
one end to the contact assembly and bolt the
other end to the right side (when facing the
front of the control box) of the shunt on the
NA-3 or to the current transformer on the NA-
4 as shown in Figure A.6. When the K234 or
K235 extension cables are used between the
control box and welding head(s), the 4 ft (1.2
m) lengths of electrode cable are not used. If
currents or duty cycles higher than 1000
amps at 80% duty cycle will be used, add
additional electrode cables per Table A.1.
TABLE A.1
80% Duty Cycle
Below 1000 amps Two 4/0
1000 to 1300 amps Three 4/0
1300 to 1500 amps Four 4/0
A-6
box must be