Instructions forDual Servo Motor Controllers

PLEASE MAKE SURE THE POWER IS NOT CONNECTED WHEN YOU MAKE OR ALTER WIRING CONNECTIONS

Electrical Connections

This board has two Servo motor control circuits.Each circuit controls a servo motor independently. Each circuit has its own set of controls. The board is split as shown: They share the same power supply connections (+ and 0)

The servo motor arm moves backwards and forwards. This board allows you toset how far the arm will travel. It allows you to set the speed the servo arm moves at and it remembers these settings after you have switched the power off.

The remembered 2 position settings and the remembered speed can then be changed if required.

The ‘F’ terminal allows more complex operations (explained later)

The Servo motors plug into the connectors labeled W R B on the diagram. Connect the white, red and black wires of the servo motor in the order shown by the letters W R B. Some servo motors are supplied with orange, red and brown wires. Orange goes to W and brown goes to B.

The board is powered with 9 to 16volts either AC or DC.The power supply is connected to the+ and 0 terminals as shown below.

Although the servo motor can be activated in a number of ways we suggest it is first set up using toggle switches. SPST(on/off) switches are suitable.

How to set up the servo positions

When first powered up the servo motor arm should be near its mid position. The motor arm can move up to 90 degrees either side of this.

You now set the two positions the servo motor arm moves between. When you move the switch to A. (this connects the 0 terminal to the S terminal)the Servo motor armwill move to position 1. When you move the switch to B (the 0 terminal is not connected to S) the arm will move to position 2.

Setting these positions is easy. First move the switch to A. Now press either ofthe set up buttons(marked with the clockwise or anticlockwise arrows) until the servo arm reaches the position you want. You can press set up button 1 and set up button 2 in turn until the servo motor arm is exactly adjusted to position 1. Move the switch to B and position 1 will be remembered. The servo arm will now travel back to its starting position. Your choice of position 2 is made by using the set up buttons 1 and 2 to finely adjust the arm again. When position 2 is reachedmove the toggle switch back to A. Position 2 will be remembered and the arm will move back to position 1.

Resetting to Mid Position

In the event of becoming confused you can reset the motor to its mid position. This is simply done by holding down the speed button until it resets. This takes about 3 seconds.

How to set up the speed

The servo motor arm can move at seven different speeds.. The speeds are indicated by the LED. When the motor is stationary the LED repeatedly shows a series of between 1 and 7 flashes. 1 flash gives the quickest movement, 7 flashes the slowest. The speed is changed by pressing then releasing the button next to the word ‘speed’. Every time the ‘speed’ button is pressed the motor will run faster and the LED will display 1 fewer flash. When you reach the quickest speed (1 flash) pressing the “speed” push button willreturn the speed to the slowest setting (7 flashes).The speed setting is also remembered in the memory. Moving the toggle switch (either way) causes the last speed to be remembered

NB To cause the speed and positions to be remembered after the power has been switched off the speed should be set first.

Extended push button box

We produce an extended push button box. This allows the Servo motor’s positions and speeds to be set when the Servo motor controller is located in an awkward position.The controls are the same as on the actual board. There is an LED to indicate speed The blue button corresponds to set up button 1, the red button to set up button 2 and the black button to the speed button. The extended push button box is on a ribbon cable which plugs into the push buttons connectors on the Servo Motor Controller board. The connectors each have 2 levers. These levers are pulled apart to allow the plug on the end of the ribbon cable from the extended push button box to be plugged in with the lug facing the notch. The levers should then be closed together. If the levers are then pulled apart the plug is automatically ejected.

Wiring Diagrams for Different Operations

Each servo motor is operated by its own switch. This can be One switch operates two servo motors together. Can be used

used foroperating each of 2 signals or 2 points independently foroperating the 2 barriers of a level crossing or 2 engine zzzzzzzzzshed doors moving at the same time.

One switch operates both servo motors. When the switch is

moved the lefthand servo arm moves from position 1 to

position 2. Once it has reached position 2 the F terminal Can be used to animate a beam engine, figure sawing etc

switches to 0 volts. This starts the right hand Servo arm moving. The servo arm continually moves between position 1 and

Used where 2 crossing gates need to move one at a time to avoid position 2. hitting one another.

Apart from switches the servo motor controller may be operated by relay contacts for example the relays on the dual timer or IRDASC-2 and 3. It can also be operated by terminal 2 of the IRDOT-1 or IRDOT-1D infra red detector. The Servo Motor Controller has a “F” (finished) terminal. When the Servo motor has finished moving it can be connected to start a second servo motor. It allows the end of one servo motor’s movement to trigger the second servo motor to move (fig3).By connecting the F to S of the same circuit it causes a servo arm to continually move backwards andforwards on its own (fig4). Note interesting effects can be achieved by using the new random feature on the dual timer to activate the Dual Servo Motor Controller.

Mechanical

The servo motors are supplied with a packet of various arms with holes to attach the operating wire. We can supply a bracket for mounting our miniature servomotors. The bracket can be used to mount the servo motor either with its arms movement at right angles to the baseboard or parallel to the baseboard. Right angled fixing allows operation of barriers signals and points. Parallel fixing is suitable for gates and doors. After bending the bracket it is advisable to strengthen the bend by running a fillet of solder along it.

Heathcote Electronics, 1 Haydock Close, Cheadle, Staffordshire, England, ST10 1UE

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