Lincoln Electric IDEALARC DC-1500 Service Manual page 18

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NL Option Kit (OBSOLETE FEATURE)
(Not Required With NA-3, NA-5, LT-7 or LT-56)
The K783 NL option kit (for field installation) is designed
permit use of the NA-2, LAF-3, LT-3 (OBSOLETE) and the
LT-3 section of the LT-34 (OBSOLETE) tractor with DC-
1500's assigned code 7687 and above. It provides the nec-
essary DC control power for the operation of the equipment
and the necessary circuitry for proper inching, cold starting
and arc striking. In using the NL option kit a K775 remote
field control is required and is included as part of the option
kit. (See pg 6, paragraph e.)
The NL option kit consists of a sheet metal box, 12.5" long,
11.5" deep and 5.7" high. This box mounts on top of the DC-
1500 and the following controls are located on the front of the
box:
1. Inch speed control — used for LT tractor only.
2. Hot start control — used to obtain optimum arc strik-ing.
3. Polarity switch — changes polarity of control circuit to cor-
respond with electrode polarity.
4. Contactor dropout delay switch — switches in or out a
slight contactor dropout delay to prevent sticking of the
wire in the crater at the end of welding.
The terminal strip for connection to the automatic equipment
is located under the front cover. All necessary control leads
for connection to the DC-1500 are wired into the NL kit for
easy connection to the DC-1500 terminal strip.
Before proceeding with any installation, be certain the
DC-1500 is turned off.
(OBSOLETE FEATURE)
1. Mount the NL option box to the top of the DC-1500 with
the screws used to fasten the roof and sides.
2. Remove the cover of the NL option for access to the ter-
minal strip.
3. Feed the control cable from the automatic wire feed con-
trol unit through the grommet on the front of the NL box.
Connect the control leads per the appropriate connection
diagram. Secure the cables to the case with the clamps
and screws provided.
OPERATION
4. Using the same diagram, connect the leads from the
option kit to the DC-1500 terminal strip.
to
5. Feed the K775 control cable through the clamp on the
front of the NL option box and connect the leads to ter-
minals 75,76, and 77 per connection diagram.
6. Replace the cover. This completes the installation.
NOTE: An NL Option was factory installed inside DC-
1500's built to codes 7562-NL, 7636-NL and 7676-NL. The
instructions for the K783 apply except as follows:
1. The factory-installed NL Option does not have a sep-
arate "POS — NEG" switch.
2. The factory-installed NL Option does not have an "Inch
Speed" control.
3. It cannot be used with LT-3 or LT-34 wire feeders.
4. The fuse protecting the 115 volt DC circuit is a 2 amp fuse
located on the NL Option panel inside the welder.
Operation When Connected to the NA-2 (OBSOLETE
FEATURE)
1. Set the "POS — NEG" switch (on both NL Option & DC-
1500) to correspond to the polarity of the electrode cable
connection.
2. Set the mode switch on the front of the DC-15000 to
"Constant Voltage — Innershield" or "Constant Voltage
— Sumerged Arc".
3. Set the toggle switch on the front of the DC-1500 to
"Output Control Remote".
4. Set the output as required for the procedures using the
K775 Remote Output Control shipped with the NL Op-
tion.
5. Set the NA-2 inch speed to a speed lower than welding
feed speed for good starting using the control on the NA-
2. The NL Option "Inch Speed" control is not in the circuit.
6. Set the "Hot Start Control" on the NL Option to 4.
7. Set the "Contactor Drop-Out Delay" switch to "Off". Refer
to the NA-2 Operating Manual for instructions for setting
the contactor drop-out delay and crater filling features
built into the NA-2 circuit.
Operation When Connected to the LAF-3 and the K783
NL Option Kit (OBSOLETE FEATURE)
For proper arc striking and welding when using the LAF-3
with the DC-1500 and K783 NL Option Kit, follow the instruc-
tions below (Turn the input power off at the fuse box before
working inside the machine.):
1. Connect the DC-1500 NL option, and LAF-3 per the con-
nection diagram M13321.
2. Remove the cover from the LAF-3 control box.
IDEALARC® DC-1500
B-6