NL Option Kit

OPERATING INSTRUCTIONS

(Not Required With NA-3, NA-5, LT-7 or LT-56)

The K783 NL option kit (for field installation) is designed to permit use of the NA-2, LAF-3, LT-3 and the LT-3 section of the LT-34 tractor with DC-1500’s assigned code 7687 and above. It provides the necessary 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 correspond with electrode polarity.

4.Using the same diagram, connect the leads from the option kit to the DC-1500 terminal strip.

5.Feed the K775 control cable through the clamp on the front of the NL option box and connect the leads to terminals 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.

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 equip- ment 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.

Operation When Connected to the NA-2

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 Volt- age — 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 fill- ing features built into the NA-2 circuit.

Before proceeding with any installation, be certain the	Operation When Connected to the LAF-3 and the K783
DC-1500 is turned off.	NL Option Kit

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 terminal strip.

3.Feed the control cable from the automatic wire feed control unit through the grommet on the front of the NL box. Connect the control leads per the appropriate connection diagram included at the back of this man- ual. Secure the cables to the case with the clamps and screws provided.

For proper arc striking and welding when using the LAF-3 with the DC-1500 and K783 NL Option Kit, follow the instructions 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 connection diagram M13321.

2.Remove the cover from the LAF-3 control box.

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