Lincoln Electric NA-5S - Manual (Page 13)

INSTALLATION A-6 A-6
NA-5
When mounting the welding head to the
standard travel carriage, (see 305-B sec.
T2.2.4) mount it so only a minimum of
overhang weight exists. Mount the head so
it stays within the dimension shown in Figure
A.5.
ELECTRICAL
INSTALLATION
ELECTRIC SHOCK
can kill.
• Do not touch electrically
live parts such as output
terminals or internal
wiring.
This section provides information on proper
wiring procedures for the NA-5 welding sys-
tem. This section also provides basic con-
nection 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
All welding heads include a 4 ft (1.2 m)
motor cable and motor tachometer cable.
Insert the plugs on these cables into the
matching receptacles on the side of the
control box.
If the 4 ft (1.2 m) cables are not sufficient,
install a K335 or K338 control to head
extension cable of the length ordered [up to
30 ft (9.1 m)]. The K335, for the NA-5S
head, includes motor, tachometer and flux
hopper lead extensions with polarized plugs
on each end, and electrode cables. The
K338 for the NA-5N, NF, and SF heads is
the same as the K335 without the flux
hopper lead extension.
The NA-5N and NA-5S also include two 4 ft
(1.2 m) lengths of electrode cable. Bolt the
terminals at one end of the the cable pair to
the wire contact assembly and the terminals
at the other end to the electrode leads on the
power source to control cable assembly.
Properly insulate the bolted connection.
When the K335 or K338 extension cables are
used between the controls and heads, 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 cable per Table A.1.
TABLE A.1
FIGURE A.5 – MOUNT TO CARRIAGE
OVERHANG DIMENSION.
19 IN.
(483 MM)
WARNING
80% Duty Cycle
Below 1000 amps Two 4/0
1000 to 1300 amps Three 4/0
1300 to 1500 amps Four 4/0
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