Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 243 of 265
38.1.3 Lamp Monitor Phase Types
Each controller phase is usually monitored by one lamp monitor sensor. Each
sensor must be assigned a lamp monitor ‘phase type’, although these do not need to
be changed from their default settings unless the lamp sequences for the phases
are altered (see section 28). The phase types currently available on the ST900
Family of controllers are shown below.
Monitored Colours Description / Example of use
Red Green Amber - Standard vehicle phase for example
Red Green Amber F/Amber
Also monitors flashing amber part-time state
for example
Red Green Amber F/Red Also monitors flashing red part-time state
Red F/Green Amber - Flashing green used for at ROW
Red F/Green Amber F/Red Plus flashing red part-time for example
Red Green F/Amber - Flashing amber instead of steady amber
Red
Green &
F/Amber
- -
Pedestrian phase with flashing amber ball
which appears during green.
Red Green
Red &
Wait
- Standard Pedestrian with wait
Red Green
Red &
Wait
F/Red Plus flashing red part-time state
Red F/Green
Red &
Wait
- Flashing green used for at ROW
Red Green - -
Amber / wait drive not used or monitored
separately
- Green - - Standard Green-Arrow
- Green Amber - Green-arrow with amber leaving aspect
- Wait - -
Separately monitored wait / demand
indicators
- On - - Regulatory Sign
- On - - Switched bulb or tube (any colour)
- F/Green - - Flashing green ball
Table 25 – Lamp Monitor Phase Types
Notes:
 ‘F/Colour’ = Flashing Colour, e.g. ‘F/Amber’ = Flashing Amber
 Each phase type does not have to include every combination that may appear on
the phase. For example, a standard UK vehicle phase is not monitored during
the red/amber period because both the red and the amber appear separately at
other points in the cycle.
 Each combination monitored by a phase type must appear otherwise learning will
never be indicated as complete. For example, if the traffic amber is not used,
change the lamp monitor phase type to the ‘Red, Green’ type.