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     SITE NAME FIFTEENTH STREET  NR ELIZABETH AVENUE   SITE NO. 6452
PUFFIN OPERATION
VARIABLE WALK AND CLEARANCE OPERATION
 
1. DETECTION INFORMATION  
     
  The controller is capable of supporting 4 PUSH BUTTON detector inputs and 4 CLEARANCE ZONE detector
  inputs.        
         
2. NOTES ON OPERATION      
           
A. PEDESTRIAN DEMAND      
         
  A demand for a pedestrian movement is placed by an activation of a PUSH BUTTON detector input.  
         
  ABNORMAL OPERATION          
         
  If a push button is continuously stuck on, then a permanent demand for the pedestrian movement 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 for each pedestrian movement runs for a minimum time. These minimum times are specified in 
  Special Purpose Timesetting No. 28 for P1 and Special Purpose Timesetting No. 32 for P2. Activation of the     
  CLEARANCE ZONE detectors (i.e. 9 and/or 10 for P1 or detectors 11 and/or 12 for P2) provide extension     
  of the walk display up to a maximum time. The maximum times for P1 and P2 are specified in P1 and P2     
  Walk Times.      
       
  Between the minimum and maximum times as specified above, the walk display for each pedestrian movement is 
  terminated if the CLEARANCE ZONE detectors have been vacated for the period as specified in Special
  Purpose Timesetting No. 26. (Note: Generally set to 2 secs).  
     
  ABNORMAL OPERATION    
     
  If the CLEARANCE ZONE detectors (i.e. 9 and/or 10 or 11 and/or 12) do not toggle ON during the Walk               
  interval up to the "STANDARD" walk, then terminate at this instant. The "STANDARD" walk for P1 is   
  specified as the total of Special Purpose Timesetting No. 28 plus Special Purpose Timesetting No. 29, while the 
  STANDARD" walk for P2 is specified as the total of Special Purpose Timesetting No. 32 plus Special Purpose 
  Timesetting No 33.      
     
  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. the 
  relevant Walk Time). 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 associated Walk will terminate at the "STANDARD"
  walk time.  
                                       
DESIGNED BY: PAUL QUAN           DATE 10/11/06
G:\TMC Opsheets\Pending\[6452.htm]PUFFIN Notes 1