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SITE NAME | PHE BTW LYONS ST & HOOD ST | SITE NO. | 5611
PEDESTRIAN OPERATION
VARIABLE WALK AND CLEARANCE OPERATION
(PUFFIN)
1. DETECTION INFORMATION |
| The controller is capable of supporting 1 PUSH BUTTON detector input and 2 CLEARANCE ZONE detector
| inputs. |  |  |  |
| Note: There are no WAIT ZONE detectors at this site. |  |  |
2. NOTES ON OPERATION |  |  |
A. PEDESTRIAN DEMAND |  |  |
| A demand for the pedestrian is placed by an activation of the PUSH BUTTON detector input. |  |  |
| ABNORMAL OPERATION |  |  |  |  |
| If the push button is continuously stuck on, then a permanent demand for the pedestrian will be placed. When the
| controller is on line to SCATS and the push button is continuously ON for the periods as specified by the SCATS
| TDA message, then a Detector Alarm (DA) will be generated on the push button. |  |  |
| If the push button is continuously OFF, then a pedestrian demand is not placed. |  |  |
B. WALK EXTENSION FUNCTION USING CLEARANCE ZONE DETECTORS |
| GENERAL |
| The walk display runs for a minimum time. This minimum is specified in Special Purpose Timesetting No. 33.
| Activation of the CLEARANCE ZONE detectors (i.e. detectors 10 and/or 11) provides extension of the walk |  |
| display up to a maximum time. This maximum time is specified in the Walk Time of Pedestrian No. 1. |  |
| Between the minimum and maximum times as specified above, the walk display is terminated if the CLEARANCE
| ZONE detectors have been vacated for the period as specified in Special Purpose Timesetting No. 31. |
| (Note: Generally set to 2 secs). |
| ABNORMAL OPERATION |  |
| If the CLEARANCE ZONE detectors (i.e. 10 and/or 11) do not toggle ON during the Walk interval up to the |  |  |  |  |  |  |
| "STANDARD" walk, then terminate at this instant. The "STANDARD" walk is specified as the total of Special
| Purpose Timesetting No. 33 plus Special Purpose Timesetting No. 34. |  |  |
| Note: When the controller is online to SCATS and a CLEARANCE ZONE detector does not toggle ON for
| the period as specified by the SCATS TDA message, then a Detector Alarm (DA) will be generated on that
| CLEARANCE ZONE detector |
| If a CLEARANCE ZONE detector does not toggle OFF during the Walk, then extend to maximum (i.e. Walk
| Time of Pedestrian No. 1). This may be due to a faulty detector, or a large number of pedestrians. |
| Note: When the controller is on line to SCATS and a CLEARANCE ZONE detector does not toggle OFF |
| for the period as specified by the SCATS TDA message, then a Detector Alarm (DA) will be generated on that
| CLEARANCE ZONE detector. If this occurs then the Walk will terminate at the "STANDARD" walk time
| (i.e. the total of Special Purpose Timesetting No. 33 plus Special Purpose Timesetting No. 34). |
DESIGNED BY: | [REDACTED] | DATE | 1/07/05
G:\TMC Opsheets\Pending\[5611.htm]PUFFIN Notes 1