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IRDOT-3D |
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IRDOT-3D |
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Both the IRDOT-3
and IRDOT-3D have a built in double pole relay and the facility to also operate both detect and undetect
LED's or a bicolour LED. The IRDOT-3D has in addition the following selectable delays: 3, 6, 9, 12, 15, 18, 21, and
24 seconds. These are selectable by connection to the terminal block. |
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Main
Uses: |
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- The same as the IRDOT-2D where
a bicolour LED display is required.
- Longer delay can be used to
isolate a crossing line to prevent collisions.
- Longer delay can be used as a
switch for level crossing lights.
- Simple 2 Aspect signalling.
The unit is placed ahead of the signal and timing is selected to be long
enough to keep the signal at green until the train has passed.
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OPERATION |
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When the
IRDOT-3D detects a train it lights a red LED and operates a double pole
relay. The IRDOT is supplied with a 5mm diameter red LED connected to the
correct screw terminals. This provides an aid while installing the IRDOT
to check for reflections off obstructions. After installation the LED is
wired to the control panel . The double pole relay is effectively the same
as two single pole double throw (changeover) switches. |
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The diagrams below show how the relay contacts
correspond to terminals. |
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LED WIRING |
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The
IRDOT3 is supplied with the red (detect) LED fitted long leg to l short
leg to k. This LED will light when a train is detected. A second LED may
be fitted long leg to k short leg to l. This will light when not
detecting. If a number of IRDOT3s are used each with a single LED these
can be wired with long leg to l short leg to "0V".The advantage
to this is that "0V" is a common connection thus nearly halving the
number of wires needed. |
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The two diagrams
below show how to wire to both 2
leg and 3 leg bi-colour LEDs. |
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DELAY TIMES |
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As
supplied the unit has a 3 second delay, i.e. it detects a train
immediately but remains detected for 3 seconds after the train has left. |
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By connecting wires
from the g, h, and i terminals longer delays are obtained. |
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Delay
g
h i
- indicates no connection, x indicates connection |
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3sec
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- - |
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6sec
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- x |
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9sec
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x - |
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12sec
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x x |
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15sec
x
- - |
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18sec
x
- x |
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21sec
x
x - |
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24sec
x
x x |
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An example of 18 second delay wiring: |
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SPECIFICATION |
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Voltage |
12 to 16 volts, AC or DC |
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SIZE |
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Inches |
Millimetres |
| Length x Width |
4.8 x 1.2 |
123 x 31 |
| Height of
infrared components |
0.9 |
22 |
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