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PUFFIN |
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PAGE 3/2 |
| SITE NAME |
STURT HWY (DEAKIN AVE) NR CALDER HWY |
SITE NO. |
6414 |
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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 |
| USED FOR CLEARANCE 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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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: |
DARREN VAUGHAN |
DATE |
13/11/17 |
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