Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 56)

T400 Controller Facilities Manual

667/EB/20200/000 Page 8-1 Issue 9

8. PHASE DELAYS

8.1 GENERAL DESCRIPTION

In order to gain more efficient use of phases during stage to stage transitions, it may be

required to delay specific phases from losing or gaining ROW.

There are up to 60 phase delay times (0 to 59) available for different phases on

different stage to stage transitions.

The timing range is 0 to 255 seconds in 1 second steps.

The programmed value may be changed via the handset using the DPG command.

8.2 PHASES LOSING RIGHT-OF-WAY

A phase may be delayed from losing ROW on a specific stage to stage transition to

obtain a clearance period. The delayed phase is held at green during the interstage for

the period of the delay time, while non-delayed phases that do not appear in the next

stage terminate. Any intergreen periods from the delayed phase to conflicting phases

will not commence to time until the phase delay period has expired, even though other

intergreen timers from phases already terminated will have started and possibly

terminated. Therefore any phases gaining right of way may have their appearance

delayed as a result of the difference in intergreen times, unless the intergreen times

allow for the phase delay time.

For example, in Figure 8.1 (referring to the intersection in section 21), Phase B is to be

delayed by 1 second on a move from Stage 1 to 3, to give a short clearance period.

Figure 8.1(a) illustrates that if the intergreen (I/G) B-E/F was 5 seconds, the same as

I/G A-E/F then Phases E and F would appear 1 second late giving an effective I/G A-

E/F of 6 seconds. To overcome this, in Figure 8.1(b) I/G B-E/F has been reduced to 4

seconds to allow for the 1 second delay on Phase B and the I/G A-E/F remains at 5

seconds.

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Siemens EH.75M.11. Especificaciones Pagina 56