Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 205 of 265
Traffic phases: Phases A,B & C Phase D
at no ROW:
RED RED
changing to ROW: RED/AMBER RED/AMBER
at ROW:
GREEN FLASHING GREEN
changing to no ROW: AMBER AMBER
The displays that are programmed to flash will do so every time they appear. They
cannot be programmed to be solid and flashing.
The flashing facility may also be applied to the part-time state and the start-up
sequence if required, for example:
Phases A,B & C
Phase D
Part-time state: FLASHING AMBER FLASHING RED
Start up sequence: RED RED
Followed by ROW going to Stage 1 before commencing a complete cycle.
28.3.1 Variable Flashing Signals
The facility is available to have flashing traffic, pedestrian and LRT signals. The rate
of flashing is adjustable with adjustable on/off ratio. The adjustment will be in 20mS
steps for both on and off periods, with a limit of 5.1 seconds.
Due to the operation of the green monitoring system, the ‘off’ period should not be
configured more than 1.5 times the length of the ‘on’ period without consulting
Siemens Engineering at Poole.
28.4 Non UK Signal Sequences
The following is a list of some of the foreign signal sequences that can easily be
configured by altering the lamp sequences…
BAHRAIN:
Blackout start-up and flashing amber part-time with
standard British traffic and pedestrian sequences (no
blackout).
Supply: 240V 50Hz.