Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 82)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-22 Issue 9

9.4.2(b) Precedence Levels

For isolated operation, the normal order of precedence for the differing levels of

priority (in descending order) shall be:

Emergency Vehicle

Hurry Call

UTC

Manual

Manually Selected other modes

CLF

Buses

9.4.2(c) Servicing of Priority Facilities at a Common Priority Level

The presence of an output from a priority vehicle detector will, while the priority phase

is running, hold the green signal. The cessation of the output will initiate a priority

extension period. A priority demand, for a phase other than that which is running,

which is received whilst a priority extension and/or priority maximum period is running

at the same priority level, will be stored and serviced when the proper extension or

priority maximum period expires, when no inhibit period is specified.

The priority extension period, for buses or for emergency vehicles will be adjustable by

means of switch(es) or other approved means over the range 0 to 15 seconds, in one

second steps.

The priority maximum running period for buses will be adjustable by means of

switch(es) or other approved means over the range 0 to 36 seconds, preferably in 1

second steps, otherwise in not more than 4 second steps.

Should two or more priority demands be stored at the termination of a minimum

running period, then the priority demands will be serviced in the normal cyclic order

and not necessarily in order of receipt. An exception may be made for LRVs (see

section 9.4.6(a)).

When a priority extension runs a phase beyond its normal maximum running period,

then a normal demand will be entered upon leaving the phase during, or at the end of,

the priority maximum running period. An extended intergreen will also be introduced

in this case if specified for the intergreen period following the state (for high speed

roads) or the maximum value of a variable intergreen will be introduced. This demand

and extended intergreen may be omitted only if, by monitoring of normal detectors, it

is established that no vehicles or vehicle extensions are present at the end of the phase.

If a phase terminates with a Priority Extension asserted, then a revertive priority

demand will be automatically entered, if the priority demand facility is specified.

Optionally, a switch may be specified to enable this reversion to be included or

excluded. This reversion shall not be included for the emergency vehicle priority level.

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Siemens EH.75M.11. Especificaciones Pagina 82