LDT 1-DEC-DC-G 4-Fold Decoder for Single Coil Turnouts

Quick Guide

The LDT 1-DEC-DC-G is a 4-fold decoder designed for controlling single coil turnout drives in DCC-format model railway systems. Before starting, ensure all power to the digital layout is switched off. The decoder requires a power supply of 12-18V AC or 15-24V DC. Programming is performed using the S1 key, which puts the decoder into a mode where the connected turnout moves every 1.5 seconds to indicate readiness.

Installation and Wiring

The decoder receives digital information via clamp KL2. It is recommended to connect this clamp directly to the command station or a booster to ensure interference-free signal transmission. The voltage supply is connected to the two-pole clamp KL1.

Connecting Turnout Drives:

• The decoder is suitable for single coil turnout drives.
• Connect the two wires of the turnout drive directly to one of the output clamps (KL6 to KL9).
• Note: ROKUHAN turnout drives require a voltage of 10-12V and the use of 9.1V Z-Diodes on each output.
• KATO UNITRACK turnouts are supported, except for the Double Crossover Track 20-210.

Programming Decoder Addresses

To program the decoder address, a turnout drive must be connected to output 1 (clamp KL9).

1. Switch on the power supply.
2. Press the programming key S1. Do not touch the integrated circuits on the PC board.
3. The connected turnout will move every 1.5 seconds, indicating programming mode.
4. Press a key on your controller or send a switch signal via PC software to assign the address.
5. If successful, the turnout will move faster.
6. Press S1 again to exit programming mode.

Programming Loc-Addresses

The decoder can also be controlled via loc-addresses (e.g., Lokmaus 2 or R3).

1. Switch on the power supply and set all speed controllers to zero.
2. Press the programming key S1.
3. The turnout on output 1 will move every 1.5 seconds.
4. Adjust the required address on the Lokmaus and turn the speed control dial away from the center position.
5. If recognized, the turnout will move faster.
6. Return the speed control to zero and press S1 again to exit programming mode.

Troubleshooting

If the decoder does not function as expected:

• Programming failure: If the turnout does not confirm programming with faster movement, check the cable connections at KL2. Ensure the decoder is connected directly to the command station or booster if there is signal interference or voltage loss.
• Consumers not activated: If the programming works but turnouts do not switch, check for signal interference at KL2 and ensure a direct connection to the command station or booster.
• Wrong direction: If the turnout moves in the wrong direction, exchange the turnout connections at the output clamp.

Technical Data

• Switching current: Up to 1 Ampere per output.
• Overload protection: Includes an automatic fuse that resets after a few seconds.
• Compatibility: DCC-Format systems (Lenz, Märklin, Intellibox, Roco, etc.).
• Operating environment: Indoor use only.