BLOCKsignalling IRP1 Infra-Red Automatic Points Controller

About the Product

The BLOCKsignalling IRP1 is an automatic points controller designed to detect approaching trains and operate standard twin-coil solenoid point motors automatically. Using two infra-red sensors positioned around the track, the module can detect passing trains and set the points to the required route without manual intervention.

The IRP1 can be configured for both facing and trailing points, making it suitable for a wide variety of model railway applications. With trailing points, the module can automatically set the points to match the line from which a train is approaching. With facing points, trains can be automatically directed between the main and branch routes.

For facing points, the module can be programmed to send a selected proportion of trains onto the branch line, either in a regular sequence or at random, adding variety to automatic layout operation.

Key Features

• Automatically operates standard twin-coil solenoid point motors.
• Includes two infra-red sensors for detecting passing trains.
• Suitable for both facing and trailing point operation.
• Automatically routes approaching trains through points.
• Programmable regular or random route selection when used with facing points.
• Adjustable branch line selection ratio.
• Points can remain locked until the complete train has passed the points.
• Adjustable infra-red sensor sensitivity.
• Can use reed switches, push buttons, relays or other switch contacts instead of infra-red detection.
• Compatible with manual control panel switches for additional points control.
• LED indicators show programming and points operation.
• Programmable settings allow operation to be customised for different layouts.
  

Infra-Red Train Detection

Two infra-red sensors are included with the IRP1 and are normally installed beneath the track. Each sensor contains an infra-red emitter and detector and works by detecting reflected infra-red light from passing rolling stock.

The sensors have a detection range of up to approximately 25mm under normal sensitivity settings and can be installed through an 8mm hole in the baseboard. They can also be positioned alongside the track to detect trains from the side if required.

Sensor sensitivity is factory set to suit most installations but can be adjusted from 1 to 10 where required.

Facing Points Operation

When used with facing points, the IRP1 detects an approaching train and automatically selects either the main or branch route.

The module can be programmed to route trains to the branch line at a selected ratio. For example, it can send one in every two, three or four trains to the branch. Regular routing provides a predictable sequence, while random routing varies which trains are sent to the branch.

A second sensor can detect when the train has completely cleared the points, preventing the points from changing underneath a passing train.

Trailing Points Operation

When used with trailing points, sensors are positioned on the main and branch lines approaching the points.

When a train is detected on either line, the IRP1 automatically operates the points to select the route from which the train is approaching. This can be particularly useful for automatically routing trains leaving sidings, goods yards or terminus stations.

Electrical Requirements

The IRP1 operates alongside a Capacitor Discharge Unit (CDU), which supplies the high-current pulse required by twin-coil point motors.

The module connects to the CDU output for points operation and also to the power supply feeding the CDU for its electronic circuitry. A single CDU can be shared between multiple IRP1 modules and manually operated points.

The IRP1 is rated for a maximum of 16V AC, or up to 20V DC when the CDU is powered from a DC supply.

Alternative Sensor Inputs

Although designed for infra-red train detection, the IRP1 can also be programmed to operate using reed switches, push buttons, relays or other switch contacts.

Either or both sensor inputs can be configured for switch operation, providing additional flexibility for different layout installations.

Wiring Diagram

Programming & Adjustments

The IRP1 includes a range of programmable settings allowing its operation to be customised to suit the layout.

Settings include:

• Facing or trailing points operation.
• Regular or random branch line routing.
• Branch line selection ratio.
• Infra-red or switch-type sensor inputs.
• Points motor drive duration.
• Points locking and unlock time.
• Sensor detection time.
• Retriggering behaviour.
• Points position when the module is powered on.

Documentation & Support

For detailed information on installation, wiring connections, and troubleshooting, please download the latest instruction manual:

Product Instruction Manual