PUFFIN   PAGE 3/1
     SITE NAME COOPER STREET NR DAVISSON STREET   SITE NO. 7034
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. 14.
  Activation of the CLEARANCE ZONE detectors (i.e. detectors 6 and/or 7) 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. 12.  
  (Note: Generally set to 1 s).  
     
  ABNORMAL OPERATION    
     
  If the CLEARANCE ZONE detectors (i.e. 6 and/or 7) 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. 14 plus Special Purpose Timesetting No. 15.      
     
  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. 14 plus Special Purpose Timesetting No. 15).  
                                       
DESIGNED BY: DARREN VAUGHAN           DATE 17/04/08
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