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IRDOT-P
AUTOMATIC POINT CONTROL |
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The
IRDOT-P uses infrared detection to switch from one to four points
(operated by solenoid point motors such as PECO or SEEP). Uses are
automatic storage sidings, points on reverse loops, trailing points and
complicated routes. |
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IRDOT-P
TERMINALS: |
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"R"
These two terminals are used to connect power to the point motor.
When the IRDOT-P first detects a train the "R" terminals are
connected together. After approx. 1 second the IRDOT-P removes the
connection between the terminals. Whether the train stops over the
IRDOT-P or continues to move the point motor is only powered for 1 second.
Also there is a dead time of approx. 4 seconds before the "R"
terminals will operate again. The 1 second timing and the dead time
prevent the point motor from damage by being continually powered.
The IRDOT-P makes this connection between the "R" terminals with
its internal relay contacts. The relay contacts are of 10 amp
capacity allowing at least four point motors to be switched. Using a
relay keeps the IRDOT-P power supply and the point motors power
electrically separate. The terminals act as an automatically
operated passing contact switch. The diagram shows two point motors
controlled by two IRDOT-Ps. |
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The
common (middle) connections of the point motor are all wired straight back
to the point motors power. When the top IRDOT-P detects its
"R" terminals will be temporarily connected giving a burst of
power to the left hand connection of both point motors, switching the
points left. When the bottom IRDOT-P detects it will switch both
point motors right.
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"LED":
this lights an LED (supplied fitted) whilst the IRDOT-P detects a train.
Long leg of the LED to "LED" short leg to "-".
This LED is useful during installation. It can be wired to the
control panel if required. |
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"V0"
and "+"
these terminals are for connection to a power supply to power the IRDOT-P.
It may be powered from 12 to 16 volts AC or DC. This supply is
separate from the one used for the point motors. |
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"P"
on first detecting a train,
this terminal switches to 0 Volts for approx. 1 second. Its purpose
is to operate other units such as the Dual Timer, latching
relays, SA1 shuttle and SA6 when the IRDOT-P detects a train. |
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I":
Terminal. "I"
(inhibit) stops the "R" and "P" terminals operating
when it is connected to 0 volts. The train detected LED still lights
when "I" is used. A switch, SA6, IRDOT, Dual Time Delay
board, relay, or Train Direction Detector can be used to operate 'I'.
This terminal is used to automatically stop the IRDOT-P from operating the
point when a train is in a certain place or travelling in a certain
direction. "I" is also used for changing from automatic to
manual point operation. |
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TRAILING
POINTS: This
is the simplest installation. The IRDOT-P is arranged so that trailing
points are always correctly set. If required they can be set
manually for the facing direction. |
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COMPLICATED
ROUTES: An
example of how two IRDOT-Ps can make a train alternate between two
different routes is shown. The IRDOT-P at B switches point 1 for the outer
oval and point 2 for the inner. The IRDOT-P at A switches point 1
for the inner oval and point 2 for the outer. The effect of this is
for the train to make alternate laps around the outer and inner lines.
This idea can be extended to more complex arrangements.
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AUTOMATIC
STORAGE SIDINGS Click
here |
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CHANGE
OVER TO MANUAL CONTROL: One
switch is used to connect all the "I" terminals to 0 volts
(terminal "V0"). When the switch operates, the IRDOT-Ps no
longer control the points. A manual point switch is wired to the two
"R" terminals. |
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SLOW
MOTION POINT MOTORS: We
can supply the IRDOT-P modified to close its relay for approximately 20
seconds. This allows sufficient time to operate slow motion point
motors. |
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SOLENOID POINT MOTORS:
Many
solenoid point motors need a large current for a short time. If the
current continuously flowed through the solenoid then it might overheat
and burn out. When the IRDOT-P detects a train it closes its relay
contacts for approx. 1 second. After this time the relay contacts
always reopen. Even if a train stops over the IRDOT-P the contacts
will only power the point for 1 second. This time allows the
required burst of current to flow to energise the point motors solenoid.
Capacitor discharge units can be used with IRDOT-Ps; these may be
essential if the IRDOT-P switches several points.
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For
more details see Solenoid Point
Motors, Information and Wiring |
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SPECIFICATION |
| Voltage |
12
to 16 volts, AC or DC |
| Maximum
current consumption |
45
m A |
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SIZE |
| |
Inches |
Millimetres |
| Length x Width |
4 5/16
x 1
3/16 |
110 x
31 |
| Height (
Board to highest component) |
13/16 |
22 |
| Height of
infrared components |
7/8 |
22 |
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