Instructions for MAS-Sequencer-RI
The MAS-Sequencer RI operates a signal in the following way:
The signal is normally at green. As a train passes the signal it will reach the MAS Sequencer which detects the train by its built in infra detection, Detecting a train causes the signal to change to red. Once the train is clear of the MAS-Sequencer s detector a timing sequence begins. This gives 3 equal timing intervals. The signal stays at red for the first interval, the signal changes to yellow for the second interval and for the third interval the signal changes to double yellow. At the end of which the signal changes to green. If another train arrives during this sequence then the signal will change to red and the sequence restarts.
The MAS-Sequencer can be used on its own to control a single signal. If more than one signal is on the same line the extra signals can be operated by IRDASC-4 units. A connection from the MAS-Sequencer s "send" terminal to the following IRDASC-4s "receive" terminal tells the IRDASC-4 which aspect the MAS-Sequencer is at. For example if the MAS-Sequencer is at yellow then the IRDASC-4 will set its signal to double yellow. Versions of the IRDASC-4 are also available for 2 and 3 aspect signals.
Position and fitting of MAS-Sequencer
Each MAS-Sequencer is positioned past the signal it controls. This position is important because the signal changes to red when the front of the train is detected. The unit is screwed to the underside of the baseboard with the infra red emitter and detector located in a hole between the sleepers. If you are using a version of the MAS-Sequencer RI with one set of sensors then the sensors will need to be located before the point where the lines split. If using the MAS-Sequencer with 2 sets of sensors each diverging line can have its own sensors allowing the train to travel onto the diverging line before the signal changes to red.
It is easiest to install the units after the track is laid. Drill a small pilot hole between the sleepers. Fit an 8mm drill bit marked with tape for slightly less than the base board thickness. Drill from underneath the baseboard following the pilot hole. Cut or file the small amount of baseboard material left between the sleepers. Install the unit, and then fill the remainder of the hole with modelling material. Blue tack will hold the units in place temporarily.
When fitted to Z or N gauge track the gap between sleepers will be less than the diameter of the infra red detector and emitter. However, the modules work well provided they are adjusted to fit close to the sleepers. This positioning prevents reflections off the sleepers causing detection.
The modules will also operate on their side placed alongside the track. For thick baseboards and restricted space we can supply units with the emitter and detector fixed to wires up to 18 inches long.
Wiring
Power: The unit may be powered from either AC or DC a supply of 12 to 16volts. Connect the positive to all + terminals. Connect the negative to all 0V terminals. Check the LED on the MAS-Sequencer board only lights when rolling stock is over the detectors.
Signals: This unit operates a 3 or 4 aspect LED signal with common negative wiring. There are versions of the MAS Sequencer for signals with common positive wiring.
C=common R=red Y=yellow Y=double yellow (extra yellow for 4 aspect signal) G=green
The diagram shows a 4 aspect common negative signal (all the short legs, cathodes, of the LEDs connect to the C Terminal).
Resisters to limit the current through the LEDs are built into the board. If resistors are supplied fitted to the signal it may be necessary to remove these if the signal is not bright enough.
Timing of sequence: This is adjusted by rotating the "pot" on the board with a screwdriver. Turn anti-clockwise for longer times.
Interconnections between units: Two wires are used to send information between units. Send "S" is wired back to receive "R" of the IRDASC controlling the previous signal. This wire sends back information about the aspect that the next signal is set at. See page 3 for wiring details.
RR terminal: Use of this terminal is optional. Its purpose is to set the signal to red. It may be required to set the signal to red for signals at stations, for interlocking to points and junctions or when a train is running in the opposite direction to the signals. "RR" is activated by connecting to 0V (negative) and sets the signal to red. This connection may be made with a switch or with the direction detector. One switch or direction detector may be connected to a line of RR terminals. The diagram shows a switch arranged to connect "0V" to the "RR" terminal.
Wiring the Route Indicator (feather)
The MAS-Sequencer-RI works exactly the same as the MAS-Sequencer until the OI terminal is used. If the signal is at red operating OI has no effect (ie full size signals do not display the route indicator if the signal is red). If the signal is displaying yellow or green then operating "OI" will cause a contact within the MAS Sequencer RI to connect the terminals "Y" and "Z" together. These are used to complete the circuit to the route indicator. Treat Y and Z exactly as if you were wiring the route indicator (feather) to an on off switch. Terminals Y and Z are isolated from the MAS Sequencer RI (they are relay contacts).
To put it in a practical way. First wire the route indicator on its own so it is always lit. Then cut the power wire going to the route indicator. Then wire the cut ends of wire to the Y and Z terminals. For Cr signals Route indicator signals the signal head and route indicator share the common negative wire. Therefore wire 12 volts to Y and the wiring connecting the route indicator to z leaving the resistor in the route indicators wire in place.
The diagram shows how the route indicator is activated. 0 volts is connected to "IO" via a switch. The switch can be operated by the points ie a microswitch or peco accesory switch.
An alternative to using a switch is to use the Point Indicator board.
HEATHCOTE ELECTRONICS, 1 HAYDOCK CLOSE, CHEADLE, STAFFS, ST10 1UE
TEL 01538 756800
web site www.heathcote-electronics.co.uk
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