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PUFFIN |
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PAGE 3/1 |
| SITE NAME |
MELROSE DRIVE
NR BROCKLEY STREET |
SITE NO. |
6144 |
| PUFFIN OPERATION |
| VARIABLE WALK AND
CLEARANCE OPERATION |
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| 1.
DETECTION INFORMATION |
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The controller is
capable of supporting 4 PUSH BUTTON detector inputs and 4 CLEARANCE ZONE
detector |
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inputs. |
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| 2.
NOTES ON OPERATION |
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| A.
PEDESTRIAN DEMAND |
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A demand for a
pedestrian movement is placed by an activation of a PUSH BUTTON detector
input. |
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ABNORMAL OPERATION |
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If a push button is
continuously stuck on, then a permanent demand for the pedestrian movement
will be placed. |
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When the controller is
on line to SCATS and the push button is continuously ON for the periods as
specified by |
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the SCATS TDA message,
then a Detector Alarm (DA) will be generated on the push button. |
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If the push button is
continuously OFF, then a pedestrian demand is not placed. |
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| B.
WALK EXTENSION FUNCTION USING CLEARANCE ZONE DETECTORS |
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GENERAL |
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The walk display for
each pedestrian movement runs for a minimum time. These minimum times are
specified in |
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Special Purpose
Timesetting No. 28 for P1 and Special Purpose
Timesetting No. 32 for P2. Activation of the |
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CLEARANCE ZONE detectors (i.e. 9 and/or 10 for P1 or detectors 11 and/or
12 for P2) provide extension |
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of the walk display up
to a maximum time. The maximum times for P1 and P2
are specified in P1 and P2 |
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Walk Times. |
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Between the minimum and
maximum times as specified above, the walk display for each pedestrian
movement is |
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terminated if the
CLEARANCE ZONE detectors have been vacated for the period as specified in
Special |
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Purpose Timesetting No.
26. (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 |
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interval up to the
"STANDARD" walk, then terminate at this instant. The
"STANDARD" walk for P1 is |
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specified as the total
of Special Purpose Timesetting No. 28 plus Special Purpose Timesetting No.
29, while the |
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STANDARD" walk for
P2 is specified as the total of Special Purpose Timesetting No. 32 plus
Special Purpose |
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Timesetting No 33. |
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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, then extend to maximum (i.e.
the |
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relevant Walk Time).
This may be due to a faulty detector, 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 associated Walk will terminate at the
"STANDARD" |
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walk time. |
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| DESIGNED BY: |
ISURU MEDONZA |
DATE |
3/04/18 |
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