INSTRUCTIONS FOR THE SA9 and SA9-S 4 detector version.

(SA9-1S identical except for signal site)


Apart from the operation of signals these instructions apply to both the SA9 and SA9-S.

The SA-9 operating sequence is as follows:

Both trains always must start at the left hand sidings. Points change for train A. Short delay. Signal clears for train A. Short delay. Train A accelerates away to siding at right. Adjustable Delay. Train A returns to its starting position. Points set for train B. Short delay. Signal clears. Short delay. Train B travels to right hand end of line. Adjustable delay. Train B travels back to its starting position at the left. Both trains are now back at the starting position and the sequence continues from the beginning.

Powering the SA9

Everything powered from 12 volt DC supply


This is the simplest way to use the unit. Leave the diode in place and connect the 12 volts D.C. supply as shown.

POWERING FROM AN AC SUPPLY


A diode is used in place of the link wire. The end of the diode with the band must point to the right as shown. Also shown is a capacitor.

TRAIN CONTROLLER


Either a 12 volt DC supply or a 16 volt AC supply is connected as described previously to power the control electronics and the IRDOT-1s. The wire link is removed. The controller is connected as shown, all other wiring is identical to the 12 volt DC supply diagram.

TRAIN DETECTORS

Either IRDOT-1 or reed switch train detectors can be used. Five train detectors are required. The positions of the train detectors are:

X marks the position of the train detector, the symbols (such as D3) refer to the SA9 terminal which that particular train detector must be joined to. Train detectors D1 stop train A. Train detectors D2 stop train B. D4 (start of) braking for left to right trains. D3 (start of) braking for right to left trains. Both "braking" train detectors should be positioned to give approximately the same distance to the stopping position. If Irdot-1 detectors are used the distance from D4 to d3 should be longer than the train length.

The previous diagram shows the wiring of the power supply to the SA9 control electronics and IRDOT-1s. Terminal "6" of the IRDOT-1 and terminal o of the SA9 are connected to the negative (or 0 Volts) connection of the power supply. Terminal "1" of the IRDOT-1 and terminal "+" of the SA-9all connect to the positive (or 12 volts) connection of the power supply. Alternatively all the units can be powered from a 16 volts AC supply. If an A.C. supply is used be careful to ensure the units are connected as described above otherwise the train detectors will not be able to operate the SA9 although they will still detect trains.
The next step is to wire the train detectors to the correct inputs (D1 to D4 as shown previously). If the IRDOT-1s are used wire terminal 2 to the appropriate input. TheD3 terminal has two train detectors connected to it.

If reed switches are used wire one end of all the reed switches to the o (0 volts) terminal and the other end of the reed switch to the appropriate terminal of the SA9. (D1 to D4.)

INSTALLATION OF POINT MOTORS

The SA9 has two relays for switching the point motors. The relays momentarily switch on for approx 1 second to operate the point motor. PECO or SEEP point motors are suitable. When the SA9 is powered the point should switch to the "D1" siding. If it switches to "D2" swop over connections "C" and "A".

To check the wiring is correct ensure that on powering the SA9 both points switch to the D1 sidings after the initial delay time. It is preferable to use a separate power supply for the points to avoid electrical interference problems. A capacitor discharge unit can be used.

WIRING THE SIGNALS (SA9-S ONLY)

Relays on the SA board switch the signals. These contacts are not electrically connected to the rest of the SA board. Wiring a signal to the SA board is identical to wiring to a change over switch.

The signals can use the same power as the SA9-S or a separate supply. The diagram shows wiring common positive LED signals using the SA9-S supply. The diode is only required if an AC supply is used. A resistor (usually supplied with the signal) is used with each signal to limit the current through the LEDs. Bulb signals can also be used.

The internal relay contacts are shown as thick lines. "sc" is the common to which one wire of the signals power connects. This is switched to one of the adjacent terminals by the SA9-S to light either the red or green. To give a realistic effect there is a short pause between the points changing and the signal changing to green then another delay before the train moves away.

Diagram on left shows common negative signals powered from a separate supply. Diode is only necessary if the supply is AC.

Diagram on right shows bulb signals. Use of resitors depends on voltage of bulbs and voltage of power supply.

SEMAPHORE SIGNALS

The relay can be used to operate semaphore signals. These may be operated by Servo Motors using our Dual Servo Control board or a slow motion point motor or a second relay with its arm adapted to move the signal.

TESTING AND SET UP ADJUSTMENTS

This is best carried out in the following order.

Turn the variable resistors with a fine screwdriver to give delay time=short, min speed=slow, max speed=fast, ACC/BR (rate of braking/acceleration)=abrupt.

Position the trains at the left hand end of the line. After the variable delay (green and red flashing) the points will switch to the D1 sidings and there will be a short delay with the red LED lit. The signal will switch to clear followed by another short delay. The green LED will light (indicating acceleration) and the train (on the D1 siding) will quickly accelerate to maximum speed. If it travels in the wrong direction reverse the track power connections out of the SA9. When the train is detected at by the train detetor connected to D4 terminal it will rapidly reduce speed and halt (the red LED will light indicating braking). Adjust the min speed setting until the train just moves . It will then travel to D1 and stop. After the delay time the points will change and the train return to the D1 siding. (a further adjustment to the minimum speed setting may be required due to possibly different electrical characteristics of each locomotives motor). As the sequence continues adjust the maximum speed setting to the required speed (unless using the controller to determine the max speed in which case the maximum speed should be left at max). As successive trains brake (indicated by red LED only lit) adjust the acc/br setting so that the train slows to the minimum speed just before reaching the appropriate train detector.

Note: min and max speed adjustments are confusing to set unless acc/brake is set to abrupt because of the effect of electronic inertia. Also maximum speed can only take effect whilst the green LED is lit and Minimum speed only whilst the red LED is lit.Finally adjust the delay time setting to the desired time. Note that the length of the flashes is proportional to the delay time.

Overload protection

Overload protection is built into the SA9 and SA9-S. If an excessive current is drawn from the unit then the overload circuit will prevent the unit from being damaged by switching off power to the track. This fault condition is indicated by the red and green LED's both lighting. As soon as the fault is rectified the unit will resume normal working.

HEATHCOTE ELECTRONICS, 1 HAYDOCK CLOSE, CHEADLE, STAFFS, ST10 1UE

TEL/FAX 01538 756800 email

web site www.heathcote-el;ectronics.co.uk

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