A shuttle module can be used to automate the operation of a single train. This is ideal for showing off a layout without needing to worry about controlling the train, or for larger layouts you can have a branch-line operating without needing intervention from the operators who are busy supervising the main line.
This is a simple shuttle module which operates on the principle of track breaks to stop the train at each end of the track. The unit will automatically control the polarity of power supplied to the track which means your train will stop at the ends and reverse out after a pre-set time.
The shuttle allows the time between reversals to be set between 10 seconds and 9 minutes. It is suitable for any DC loco which draws up to 2A at a maximum of 30V. Please note that this shuttle is not suitable for use on DCC.
The unit only works in conjunction with a controller - this is used to control the speed of the train, the shuttle unit only controls direction.
It requires a power supply of between 7.5 and 25V DC or 8 and 20V AC at around 50mA. In some cases this can be taken from the track feed from the controller, however a separate power supply may be required.
Installation Instructions
To install the AS101 Automatic shuttle, you will need:
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Equipment to cut the track.
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A model railway controller or a PWM motor controller.
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A power supply for the shuttle – this can be shared with the controller, or if present a 16V AC auxiliary supply can be used.
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Wire and a means of feeding power to individual rails.
To install the shuttle, it is necessary to create two isolating sections in your trackwork. These enable the train to be stopped at either end of the line. You should decide on the longest loco or train you wish to shuttle and use this to determine how long a section to create. You also need to check which wheels collect power – for example, some DMUs only collect power from one bogie. The train will stop as soon as the power-collecting wheels enter the isolating section.
Cut one rail in two places as shown then attach feed wires as shown in the diagram above. These wires should be connected to the shuttle as marked in the diagram on the right.
To test the wiring, connect the controller but do not power the shuttle. Place your loco on the track and drive it to each end – it should stop once it passes the rail break. If not then try reversing the S1 and S2 connections to the shuttle.
The next step is to apply power to the shuttle. Set the delay to minimum (fully clockwise). Take care when adjusting the delay not to force the control past the end stop as it will be damaged. The loco should start shuttling between the two ends of the track and will exit the isolating sections when the shuttle reverses direction.
You should now adjust the speed via the controller and the delay setting so the train shuttles as desired.
Notes:
The shuttle does not control the acceleration or deceleration, therefore, high speed will result in sudden stopping and starting.
The delay between direction reversal is fixed, the shuttle does not detect when the train enters the station. The train speed and shuttle delay should be adjusted in tandem to obtain the desired stopping time at each end. Some locos perform differently based on direction of travel so you should check both ways to ensure the delay is correct.
In some cases the shuttle can be powered from the controller output. Wiring would be as shown, however please note that some controllers are not suitable to power the shuttle. If the lights on the shuttle flicker when being powered this way then this indicates the power supply is not stable and a dedicated unit should be used instead.
The length of isolating sections can be altered with further rail breaks. Use a SPDT switch to select between connecting the new section to the LH Rail and the S1/S2 feed. When switched to LH Rail the train will pass, when switched to S1/S2 it will stop.
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