Siemens EH.75M.11. Spezifikationen PDF herunterladen (Seite 34)

T400 Controller Facilities Manual

667/EB/20200/000 Page 3-5 Issue 9

The normal functions of a switched sign phase are as follows:

3.2.5(a) Secret Regulatory Signs

Secret regulatory signs, e.g. NRT, NLT, etc. are illuminated and extinguished at a

certain time of day when a specified associated phase loses ROW.

3.2.5(b) WAIT Indicator for 3-aspect Phases (Export Only)

When a pedestrian phase has a WAIT indicator the power to it is normally supplied by

the amber drive. If a pedestrian phase has 3-aspects (i.e. Red Man-Amber Man-Green

Man), or if a traffic phase requires a WAIT indicator, then this drive is not available.

A switched sign phase is then used. It is illuminated when the phase is not active and a

demand for it is present. It is extinguished when the pedestrian phase gains ROW.

3.3 CONFLICTING PHASES

Real phases which cannot appear together for safety reasons are considered to be

conflicting and as such must have intergreen times between them.

Phases which conflict but may never make a phase to phase transition due to stage

movement restrictions must also have intergreen times between them. This is to cover

the possibility of intergreen and minimum green times of phases in intermediate stages

being set low enough on the handset to allow the phase to phase transition to take

place. If an intergreen time is not specified by the Customer then it will be set to 5

seconds.

Phases which do not conflict and never appear together are considered to be non-

conflicting phases and as such will not have an intergreen time.

Works specification form IV is used to determine conflicting phases, i.e. the ones with

times are conflicting.

3.4 OPPOSING PHASES

Demands for opposing phases are used to start phase maximum green timers.

Normally, phases which conflict also oppose. Dummy phases that would conflict if

they were real phases also oppose.

Phases which do not conflict but do not always appear together may be programmed

to oppose in order to start one or the others maximum green timers.

When a phase is active any latched demands for it are disregarded. Therefore, when

opposing phases appear at the same instant, they will not start each others maximum

green timers.

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Siemens EH.75M.11. Spezifikationen Seite 34