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SERVO
MOTOR CONTROLLER- DUAL |
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Servo
Motor
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Servo
motors have many applications for model railways. Some things which may be
operated by servo motors are:
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Points
(slow motion operation), semaphore signals, uncoupling ramps, opening and
closing both swinging and sliding doors (e.g. engine shed, factory), gates
(private siding or level crossing), and level crossing barriers. Also to
animate models of swings, cranes, beam engines, Fairground rides, moving
figures sawing, swinging hammers or picks, raising beer glasses, waving at
trains etc.
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A
servo motor is a device allowing the angle of rotation of a shaft to be
controlled. Inexpensive good quality ones are made for radio controlled
models. (e.g. for controlling the rudder of a radio controlled boat.)
These are well suited for use with model railways. Three wires connect to
the Servo motor, 2 for power and a third which sends an electrical signal
to “tell” the servo motor which angle to turn to. The Servo motor can
move its arm over a total angle of approximately 270 degrees
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We
can supply suitable miniature sized servo motors.
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Servo
Controller
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Our
Servo Controller provides the correct power and position signal to the
servo motor and gives an easy way of fixing the “open” and
“closed” positions of the Servo motor and a way of controlling the
speed of movement between these positions.
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The
Servo Motor Controller-Dual is a circuit board controlling two servo motors,
each motor having a separate set of controls /connectors. The two
controllers can work in unison or independently |
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Each
servo motor plugs into the socket labelled “servo motor connection”. Terminals “+”
and “0” supply power to the board.
Terminal “S” (start) controls
the servo motors movement. It can be connected to an on/off switch or one
of our electronic devices for example an IRDOT-1D. When a 0V connection is
made to this terminal the servo motor will move to its open position,
when
no connection is made (switch is thrown) it will move to its closed
position.
Terminal F is used to sequence operation of the servo motors.
Its use is optional. When the servo motor is at its closed position
terminal F will switch to 0 volts. Hence terminal F can be wired into
terminal S of the next servo motor causing it to operate when the first
servo motor has finished moving.
It can be wired into its own terminal
S causing the servo motor to repeatedly open and close |
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Setting
up the Servo Motor
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The
servo motor plugs into the 3 way connector on the board labelled
“servo motor connection”. A power supply from 9 to 16 volts either AC or DC is
connected to terminals “+” and “0” and the required connections
are made to the “F” and “S” terminals. |
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Setting
up the Servo Motor Controller- Dual |
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Adjustment
of open and close positions
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The board is supplied adjusted for the servo motors to
the midpoint position (leaving up to approx 135 degrees of clockwise and
135 degrees of anti clockwise movement available for adjustment).
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The
adjustment of the open and closed positions is done electronically. This
is much easier than having to make fine mechanical adjustments.
It may be a good idea to initially try out the controller by connecting an
on/off switch between S and 0.
The
Servo Motor Controller- Dual board has 6 pushbutton switches, 3 for each
servo motor. Switches “a” and “b” are used for setting up the open
and closed positions of the servo motor. Pressing switch “a” moves the
motor clockwise. Pressing “b” moves the motor anticlockwise.
Pushbutton “c” sets the speed at which the motor rotates.
The
open and close positions are easily set and described here for a single
unit.
With
the on/off switch in the open position press the “a” and “b” push
buttons until the servo motor has moved to the required open position.
Then throw the switch. The Servo Motor Controller- Dual will remember this
position. Now set the closed position in the same way. Throw the switch
again to cause the servo motor controller to remember the second position. |
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If
you become confused you can reset both the open and closed positions to
the mid position. To do this simultaneously press buttons “a” and
“b”.
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Servo
motor speed.
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There
is a choice of 7 different speeds for the servo motor. Every press of the
speed pushbutton “c” increases the motor speed until you reach the
fastest speed. The next press of “c” will then return you to the
slowest speed.
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Wiring
Diagrams for Different Operations
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Fig
1 Each servo motor is operated by its own switch.
Used for operating each
of 2 signals or points independently |
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Fig
2 One switch operates two servo motors together.
Used for operating the 2
barriers of a level crossing or 2 points together where the 2 points form
a crossover , or 2 shed doors of an engine shed.
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Fig
3 One switch operates both sequentially. First, servo motor 1 moves from
the open to a closed position, then servo motor 2 moves from the open to a
closed position.
Used for crossing gates to give gate clearance whilst
movement is taking place
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Fig
4 The servo motors continually open and close.
Can be used to animate a
beam engine, figure sawing etc |
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Set
up box connector |
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Where
the servo motor controller is in a difficult position then you can use the
set up box to adjust the settings. This box has the 3 push buttons “a”
,”b” and ”c” and connects to the servo motor controller with a 2
metre length of cable which plugs into the set up box connector. Note the
notch on the connector to prevent connecting the wrong way round. The
cable is easily removed using the release levers on the connector.
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Only
one set up box is required regardless of the number of servo motor control
boards. This box is available separately. |
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Mechanical
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The
servo motors are supplied with a packet of various arms with holes to
attach steel wire. We can supply a bracket for mounting miniature size
servo motors. 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.
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Motor
and Controller set up |
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The Servo Motor |
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The
Servo Motor is fixed in a suitable place with the supplied bracket. With
the motor in midpoint
position and the Servo Motor arm attached in an appropriate place, the
wire from the object to be moved is attached to the Servo Motor arm. |
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The Servo Motor
Controller |
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The
wired plugs from the motor is connected to the socket in the controller.
An on/off
switch is wired in.
Wiring
for power is then added (not shown in the picture) |
Using
the buttons for clockwise and anti clockwise movement the first position
is found. The switch is thrown fixing the first position. The second
position is similarly found. The switch is thrown fixing the second
position. |
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Switching now moves the Servo Motor arm and the mechanism attached to
it, e.g. points, signals etc., between the two fixed points |
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The switch can be replaced by
devices to automate the movement |
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The
speed button adjusts the speed of movement. |
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Video
of servo motor in use: |
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Points |
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Signal |
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Crane |
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