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PUFFIN |
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PAGE 3/2 |
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| SITE NAME |
PRINCES HIGHWAY NR
CAMPBELL STREET |
SITE NO. |
6616 |
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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 for each pedestrian movement. These minimum
times |
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are
specified in Special Purpose Timesetting No. 30 for P1 and Special Purpose
Timesetting No. 34 for P2. |
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Activation
of the CLEARANCE ZONE detectors (i.e. 9 and/or 10 or 11 and/or 12 for P2)
provide extension of |
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the
Flashing Clearance display up to a maximum time. The maximum times for P1 and
P2 are specified in P1 |
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and P2 Clearance 1 Times. |
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Between
the minimum and maximum times as specified above, the Flashing Clearance
display for each |
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pedestrian
movement is terminated if the CLEARANCE ZONE detector has been vacated for
the period as |
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specified in Special
Purpose Timesetting No. 27 (Note: generally set to 1 s). |
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ABNORMAL OPERATION |
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If
the CLEARANCE ZONE detectors (i.e. 9 and/or 10 or 11 and/or 12) do not toggle
ON during the Walk and |
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through
the Flashing Clearance interval up to the "STANDARD" clearance
time, then terminate at this instant. |
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The
"STANDARD" clearance time for P1 is specified as the total of
Special Purpose Timesetting No. 30 plus |
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Special
Purpose Timesetting No. 31, while the "STANDARD" clearance time for
P2 is specified as the total of |
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Special Purpose
Timesetting No. 34 and Special Purpose Timesetting No. 35. |
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Note: When the
controller is online to SCATS and a CLEARANCE ZONE
detector does not toggle ON |
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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 |
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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. the relevant Clearance Time). This
may be due to a faulty detector, or |
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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. |
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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 a
pedestrian 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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P1 |
Switch detector 13 to the
ON position |
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P2 |
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Switch detector 14 to the
ON position |
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Set XSF3 flag |
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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. for P1 the total |
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of
Special Purpose Timesetting No. 28 plus Special Purpose Timesetting No. 29
and for P2 the total of Special |
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Purpose Timesetting No.
32 plus Special Purpose Timesetting No. 33). |
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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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P1 |
Switch detector 15 to the
ON position |
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P2 |
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Switch detector 16 to the
ON position |
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Set XSF4 flag |
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Set XSF6 flag |
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In
this situation the flashing clearance interval will be automatically set to
the "STANDARD" clearance time |
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(i.e.
for P1 the total of Special Purpose
Timesetting No. 30 plus Special Purpose Timesetting No. 31 and for P2 |
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the total of Special
Purpose Timesetting No. 34 and Special Purpose Timesetting No. 35). |
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| DESIGNED BY: |
SARATH
PREMACHANDRA |
DATE |
11/11/08 |
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| G:\TMC
Opsheets\Pending\[6616.htm]PUFFIN Notes 2 |
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