Siemens EH.75M.11. Spezifikationen PDF herunterladen (Seite 33)

T400 Controller Facilities Manual

667/EB/20200/000 Page 3-4 Issue 9

green arrow that appears unconditionally must always be followed by its associated

phase by means of stage movement restrictions (see section 10). Alternative methods

of control can be provided to meet other specifications.

During Manual Mode the appearance of the filter green arrow during its associated

stage(s) is configurable, i.e. ON, OFF or Demand Dependant.

In the example in Figure 21.2 and Figure 21.3, phase D is a filter green arrow

associated with Phase E. If Phase D appears during stage 2 then the demand for Phase

E will ensure that Stage 3 follows. If Phase D does not appear in Stage 2 then Stage 3

needn’t necessarily follow.

3.2.3(b) Indicative Green Arrow

An indicative green arrow may be used when an early cut off facility is required to

allow turning traffic. The green arrow will be illuminated after a pre-determined

intergreen period from the conflicting main movement. This is normally set at 3

seconds so that the green arrow appears at the start of the conflicting red. The green

arrow will remain illuminated throughout the green of its associated phase and will be

extinguished at the commencement of the amber leaving.

If required, the demand for the indicative green arrow will only mature if a demand

exists for an opposing or other specified phase.

It may be required to use a Call/Cancel facility with an indicative green arrow (see

section 5).

To meet Department of Transport specifications, an indicative green arrow must

always be followed by the amber leaving of its associated phase. If a direct move back

to the main movement is required the stage change must go via an All-Red Stage (see

sub-section 7.1).

Alternative methods of control can be provided to meet other specifications.

In the example in Figure 21.2 and Figure 21.3, phase C is an indicative green arrow

associated with Phase B. Phase C will be illuminated after an inter-green period from

Phase A has timed off.

3.2.4 Dummy Phase

A dummy phase may be used in situations where timings or detector conditioning have

to be associated with a traffic movement that is not uniquely signalled. The dummy

phase provides suitable time periods or conditions stage changes even though no signal

aspects are associated with the phase.

3.2.5 Switched Sign Phase

A switched sign phase is a phase that is not allocated to a stage but is illuminated and

extinguished by the timeclock or when specific conditions occur.

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Siemens EH.75M.11. Spezifikationen Seite 33