GENERAL NOTES
OPERATION OF THE RAMP SIGNALS
GENERAL DESCRIPTION
The controller operates in Flexilink isolated mode.
The controller uses Z+ Flexilink to activate system operation.
When Z+ (Flexilink) is set the controller will operate as described below in Detector Operation.
When system is not active (ie. no Z+ (Flexi)), SG1 will remain green.
When Z+ (Flexi) is removed, close down SG2 and hold red.
Z+ (Flexilink) is set using the following schedules-
SC1>8*09:30=1
SC2>8*15:30=0
(PD1Z+=C!)
The Link Mode must be set to Flexilink (LM=F) to provide correct operation.
SIGNAL GROUP OPERATION
Signal Group 2
SG2 is normally blank.
SG2 closes down when BØ is demanded and stays red until the end of AØ minimum green. SG2 red is blanked at the end of AØ minimum green.
SG2 uses BØ yellow and all red timesettings. 
(AØ ECO is used to allow for truck travel time delay)
Signal Group 3
SG3 is a dummy group for conflict purposes only – the controller requires a non-empty conflict diagram.
DETECTOR OPERATION
Detector 1 (Truck Call Function )
-         Detector 1 on, - Place a demand for BØ.
-         Turn on Special Output No. 1 (Refer to “Operation of Sign A” notes).
If detector 1 does not change from ON to OFF during AØ intergreen (ECO, yellow and all-red) then at the end of AØ minimum green start flashing SG2 yellow.
SG2 remains flashing until detector 3 is activated or detector 1 changes state from ON to OFF. When detector 3 is activated, SG2 goes blank for the duration of Special Purpose Timesetting No. 9, and then closes down.
Detector 2 (Truck Cancel Function)
BØ automatically extends out to maximum unless the truck Cancel is activated.
Truck departing detector 2 terminates BØ.
BØ cannot terminate until the end of BØ minimum green.
Detector 3 (Backup push button for Truck Call)
Activation of PB3 starts Timer 1 (Special Purpose Timesetting No. 9).
Timer 1 expired, places demand for BØ.
Turn on Special Output No. 1 (Refer to “Operation of Sign A” notes).
Fault Conditions
Detectors 1, 2 & 3 do not alarm in the OFF state.
If Detector 1 is ON continuously, BØ will not be demanded by Detector 1 until Detector 1 changes state from OFF to ON.
If Detector 2 is ON continuously, BØ will run to maximum green.
If Detector 3 is ON continuously, BØ will not be recalled by Detector 3 until Detector 3 changes state from OFF to ON.
OPERATION OF SIGN A “PREPARE TO STOP”
Special Output No. 1 drives sign A “Prepare to Stop.”
Turn on Special Output 1 after the expiry of Timer 2 (Special Purpose Timesetting No. 10) that starts at the start of AØ ECO.
Turn off Special Output 1 at the beginning of AØ.
OPERATION OF SIGN B “SPEED LIMIT SIGN/RAMP SIGNALS ON”
Special Output No. 2 drives sign B “60 km/h” & “Ramp Signals On”.
When Z+ (Flexi) is set, turn on sign B.