Lincoln Na5 Service Manual

OPERATING INSTRUCTIONSB-8B-8
Wire Feed Motor AccelerationELECTRIC SHOCKcan kill.
• Turn off input power to the welding power source
using the disconnect
switch before working on
this equipment.
The NA-5 has two different speeds of
controlled wire feed motor acceleration.  As
shipped, the unit is connected for fast
acceleration which is best for most
applications.  To change to the slower
acceleration, turn off all input power to the
NA-5 control box.  Open the control box.
Locate the Control PC Board...

TABLE  B.2 – STOPPING SEQUENCE SETTINGS.
When “Stop” Button is Pressed Older Models Newer Models*
Feed motor stops and  Lead #693 to Pin 3
electrode burns back with  Lead #690 to Pin 4
contactor delay (standard)
Feed motor inches up and  Lead #693 to Pin 1
electrode burns back with Lead #690 to Pin 4
contactor delay
Feed motor inches up and  Lead #693 to Pin 1
contactor opens Lead #690 to Pin 2
(no burnback)
*NOTE:
VOLTAGE CONTROL
RESPONSE
The NA-5 is provided with selectable voltage
control response....

AUTOMATIC SHUTDOWN
If the NA-5 voltage control is unable to
supply the “Set” value of the arc voltage
while welding, the automatic shutdown
circuit will activate.  This protection circuit
immediately returns the NA-5 control to idle
state within a few seconds after the arc
voltage discrepancy occurs.
Typical causes that activate this protective
shutdown circuit are as follows:1. “Set” value of arc voltage is outside the power source range.
2. Power source voltage control not set for “Remote”.
3....

OPERATING INSTRUCTIONSB-11B-11
NA-5
In some cases, it is also possible to hold the
“Actual” button pressed while starting the
arc.  Before the NA-5 shuts down, the actual
arc voltage can be read on the digital meter.
Comparing this reading to the “Set” reading
will tell what change in the range controls of
the power source are required so it can
supply the desired voltage.  Should the
meter read zero, check the NA-5 sensing
leads (#21 and #67) connections.  Should
the meter read negative (-) voltage,...

OPERATING INSTRUCTIONSB-12B-12
NA-5
SECURITY OF WELD
PROCEDURE SETTINGS
There are two means provided to prevent or
limit unauthorized readjustment of the NA-5
voltage and wire feed speed controls once
set to the desired procedure.1. The security panel of the NA-5 can be locked to prevent access to the
control knobs.
2. The control range of the procedure control knobs can be limited to either
about 3% or about 15% of the full
range control by installing a knob
rotation stop screw to any or all of the...

TABLE OF CONTENTS
- ACCESSORIES SECTION - 
NA-5
Accessories  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
 . . . . . . . . . . . Section C
General  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
 . . . . . . . . . C-2
Listing of Accessories  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3 K29 Vertical Lift Adjuster  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
K58 Magnetic Separator  . . . . . . . . . . . ....

C-2ACCESSORIESC-2
NA-5
Product NumberProduct Name
K29 VERTICAL LIFT ADJUSTER
K58 MAGNETIC SEPARATOR
K96 HORIZONTAL  ADJUSTER
K129 SUBMERGED ARC SMALL WIRE TWINARC
K148 CONTACT NOZZLE
K149 LINC-FILL LONG STICKOUT EXTENSION
K218 HORIZONTAL FILLET/LAP ATTACHMENT
K219 FLUX HOPPER KIT
K223 SOLENOID KIT
K225 SUBMERGED ARC TWINARC KIT
K238 HIGH FREQUENCY UNIT
K239 TWINARC KIT FOR INNERSHIELD ELECTRODES
K278 SPREADARC
K281 SOLID WIRE STRAIGHTENER FOR TINY TWINARC
K285 CONCENTRIC FLUX CONE
K310 FLUX SCREEN
K325...

ACCESSORIESC-3C-3
NA-5 
LISTING OF ACCESSORIES
K29 VERTICAL LIFT ADJUSTER
When mounted in the NA-5 head mounting
system, the K29 Vertical Lift Adjuster
provides quick hand crank adjustment of the
vertical head position. It also has some
horizontal adjustability as described in Sec.
T3.2.3 of operator’s manual IM305.
Installation instructions are shipped with
each K29 Vertical Lift Adjuster kit, are
contained in the IM305 manual, and can be
ordered as Sec. T2.2.11.
K58 MAGNETIC SEPARATOR
Useful with any...

ACCESSORIESC-4C-4
K225 SUBMERGED
ARC TWINARC KIT
The Twinarc kit provides for the feeding of
two 5/64, 3/32, or 1/8 in. (1.98, 2.38, or
3.18 mm) solid wires through a single wire
feeder. The electrode wire must be the
same size. The assembly includes a wire
reel, insulated reel mounting bracket, wire
straightener, dual wire guides, nozzle, and
contact block. Installation, operating, and
maintenance instructions are shipped with
each kit, are contained in the IM305 manual,
and can be ordered as Sec....

ACCESSORIESC-5C-5
NA-5
K334 START AND CRATER
CONTROLS 
Easily installed procedure and timer boards
to permit adjustment of wire speed and
voltage.  Can be installed to function at
either the start of the weld or at the end for
crater filling.  Installation, operating, and
maintenance instructions are shipped with
each kit and can be ordered as Sec. T2.5.13
K334.
K336 REMOTE INTERFACE
MODULE 
Permits connection of customer-furnished
remote start-stop and inch momentary
contact closure or momentary 24...