Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 42)

T400 Controller Facilities Manual

667/EB/20200/000 Page 3-13 Issue 9

c) be demand dependant

3.10 CONDITIONS OF TERMINATION

3.10.1 Termination Type 0

The phase terminates at the end of its associated stage. If the phase appears in

consecutive stages then it will remain at green throughout the interstage period.

This is the normal type of phase termination. (See Figure 21.2 and Figure 21.3).

3.10.2 Termination Type 1

The phase terminates when a specified associated phase gains ROW. The associated

phase must be a fixed phase.

The normal use for this type of phase is a filter green arrow as illustrated with Phase D

in Figure 21.2 & Figure 21.3.

3.10.3 Termination Type 2

The phase terminates when a specified associated phase loses ROW. The associated

phase must be a fixed phase.

The normal use for this type of phase is an indicative green arrow as illustrated with

Phase C in Figure 21.2 & Figure 21.3.

3.11 EARLY TERMINATION OF PHASES

Once a phase has gained ROW in a stage it cannot normally be terminated before the

end of the stage.

If early termination of a phase is required, usually for a pedestrian phase, it is achieved

by using two consecutive stages. The phase that is to terminate early is allocated to the

first stage while the other phases that are to stay at ROW are allocated to both stages.

The normal method of operation is for a demand to be inserted for the second stage

when the first stage becomes active. A stage change will then occur following the

expiry of the minimum green of the early terminating phase.

The controller is programmed so that the stage change occurs without an interstage to

give the appearance of one stage instead of two.

Variations of this method of control may also be achieved.

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Siemens EH.75M.11. Especificaciones Pagina 42