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PUFFIN |
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PAGE 3/2 |
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| SITE NAME |
COOPER STREET NR
DAVISSON STREET |
SITE NO. |
7034 |
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| C.
CLEARANCE EXTENSION FUNCTION |
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GENERAL |
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The Flashing Clearance
display runs for a minimum time. This minimum time is specified in Special
Purpose |
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Timesetting
No. 16. Activation of the CLEARANCE ZONE detectors (i.e. detectors 6 and/or
7) provides |
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extension of the
Flashing Clearance display up to a maximum time. This maximum time is
specified in the |
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Clearance 1 Time of
Pedestrian No. 1. |
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Between the minimum and
maximum times as specified above, the Flashing Clearance display is
terminated if the |
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CLEARANCE
ZONE detector has been vacated for the period as specified in Special Purpose
Timesetting No. 13 |
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(Note: generally set to 1
s). |
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ABNORMAL OPERATION |
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If the CLEARANCE ZONE
detectors (i.e. detectors 6 and/or 7) do not toggle ON during the Walk and
through |
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the Flashing Clearance
interval up to the "STANDARD" clearance time, then terminate at
this instant. The |
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"STANDARD"
clearance time is specified as the total of Special Purpose Timesetting No.
16 plus Special Purpose |
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Timesetting No. 17. |
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Note: When the
controller is online to SCATS and a CLEARANCE ZONE
detector does not toggle ON for |
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the
period as specified by the SCATS TDA message, then a Detector Alarm (DA) will
be generated on that |
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CLEARANCE ZONE detector |
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If a CLEARANCE ZONE
detector does not toggle OFF during the Walk and through the Flashing
Clearance |
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interval, then extend to
maximum (i.e. Clearance 1 Time of Pedestrian No.
1). This may be due to a faulty detector, |
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or a large number of
pedestrians. |
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Note: When the
controller is on line to SCATS and a CLEARANCE ZONE
detector does not toggle OFF |
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for the period as
specified by the SCATS TDA message, then a Detector Alarm (DA) will be
generated on that |
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CLEARANCE
ZONE detector. If this occurs then the Flashing Clearance interval will
terminate at the |
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"STANDARD"
clearance time (i.e. the total of Special Purpose
Timesetting No. 16 plus Special Purpose |
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Timesetting No. 17). |
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| 3.
OPERATION WITHOUT THE CLEARANCE ZONE DETECTORS
BEING |
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| USED FOR WALK EXTENSION |
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If it is decided that
the pedestrians is to operate without the CLEARANCE ZONE
detectors extending the |
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walk, either or both of the following 2 methods can be used to allow
this to occur. |
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Switch detector 8 to the
ON position |
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Set XSF5 flag |
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In this situation the
walk interval will be automatically set to the "STANDARD" walk time
(i.e. the total of Special |
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Purpose Timesetting No.
14 plus Special Purpose Timesetting No. 15). |
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| 4.
OPERATION WITHOUT THE CLEARANCE ZONE DETECTORS BEING |
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If it is decided that
the pedestrians is to operate without the CLEARANCE ZONE
detectors extending the |
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clearance, either or both of the following 2 methods can be used to allow
this to occur. |
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Switch detector 9 to the
ON position |
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Set XSF6 flag |
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In
this situation the clearance interval will be automatically set to the
"STANDARD" clearance time (i.e. the |
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Special Purpose
Timesetting No. 16 plus Special Purpose Timesetting No. 17). |
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| DESIGNED BY: |
DARREN VAUGHAN |
DATE |
17/04/08 |
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| G:\TMC
Opsheets\Pending\[7034.htm]PUFFIN Notes 2 |
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