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SITE NAME | PHE BTW LYONS ST & HOOD ST | SITE NO. | 5611 |
C. CLEARANCE EXTENSION FUNCTION |
| GENERAL |  |  |  |
| The Flashing Clearance display runs for a minimum time. This minimum time is specified in Special Purpose |
| Timesetting No. 35. Activation of the CLEARANCE ZONE detectors (i.e. detectors 10 and/or 11) provides |
| extension of the Flashing Clearance display up to a maximum time. This maximum time is specified in the |
| Clearance 1 Time of Pedestrian No. 1. |  |  |
| Between the minimum and maximum times as specified above, the Flashing Clearance display is terminated if the
| CLEARANCE ZONE detector has been vacated for the period as specified in Special Purpose Timesetting No. 32
| (Note: generally set to 2 secs). |  |  |  |  |
| ABNORMAL OPERATION |  |  |  |  |
| If the CLEARANCE ZONE detectors (i.e. detectors 10 and/or 11) do not toggle ON during the Walk and through
| the Flashing Clearance interval up to the "STANDARD" clearance time, then terminate at this instant. The |
| "STANDARD" clearance time is specified as the total of Special Purpose Timesetting No. 35 plus Special Purpose
| Timesetting No. 36. |  |  |  |  |
| 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 and through the Flashing Clearance |
| interval, then extend to maximum (i.e. WalkTime 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 Flashing Clearance interval will terminate at the |
| "STANDARD" clearance time (i.e. the total of Special Purpose Timesetting No. 35 plus Special Purpose |  |
| Timesetting No. 36). |  |
3. OPERATION WITHOUT THE CLEARANCE ZONE DETECTORS BEING |  |  |  |  |  |  |
USED FOR WALK EXTENSION |  |  |
| If it is decided that the pedestrians is to operate without the CLEARANCE ZONE detectors extending the |
| walk, either or both of the following 2 methods can be used to allow this to occur. |
| Switch detector 12 to the ON position |
| Set XSF5 flag |
| In this situation the walk interval will be automatically set to the "STANDARD" walk time (i.e. the total of Special
| Purpose Timesetting No. 33 plus Special Purpose Timesetting No. 34). |
4. OPERATION WITHOUT THE CLEARANCE ZONE DETECTORS BEING |
USED FOR CLEARANCE EXTENSION |
| If it is decided that the pedestrians is to operate without the CLEARANCE ZONE detectors extending the |
| clearance, either or both of the following 2 methods can be used to allow this to occur. |
| Switch detector 13 to the ON position |
| Set XSF6 flag |
| In this situation the clearance interval will be automatically set to the "STANDARD" clearance 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 2 |