Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 53)

T400 Controller Facilities Manual

667/EB/20200/000 Page 7-2 Issue 9

7.2 RED EXTENSION DURING INTERGREEN

The occupation of an All Red detector loop during its specified stage to stage

movement will generate an All Red extension.

When using priority mode to provide priority facilities for Light Rail Transit schemes,

the priority demands (LRV requests) can be used to extend the all Red period. The all

red extensions called by LRV requests can be configured to be different depending

upon the stage being left (flexible all red).

(N.B. As the extend all red signals are available in special conditioning, the extend all

red period may be introduced due to special conditions when required.)

The extension will continue all the while the loop is occupied. When the loop is cleared

the extension will continue for a fixed period - the All Red Extension period.

When the first phase in the stage that is about to go to green reaches the start of its

red-green transition period, all intergreen and delay times concerned with the

intergreen will be held until either the All Red Extension period or the All Red

Maximum period terminates. (See also section 8.2).

During the red extension period, any phase change delay timing is suspended (i.e. any

further delays given to phases gaining ROW after the extended red condition will occur

unchanged).

During all modes, except Fixed Time Mode, the red extension and maximum red

period can operate as normal or, if required, the extended red period can be

automatically extended up to the maximum red value. (See Figure 21.9).

During Fixed Time Mode, the controller automatically extends the red period up to the

maximum red value for safety reasons.

There are 7 facilities (units 1 to 7) available for different sets of all-red detectors. If

one set is to be used for several stage to stage transitions, then this would only require

one facility.

Care must be taken to ensure that no stage to stage movement is repeated on different

facilities (units). In the example in Figure 21.9, it would not be possible to satisfy a

requirement to extend the all red on the stage movement 1 to 3 using facility unit 3, as

this movement has already been specified against facility unit 1.

This restriction is due to the fact that the stage to stage movements for the 7 units

mentioned are specified in a binary fashion in three tables, see the example overleaf:

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 307 308

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Siemens EH.75M.11. Especificaciones Pagina 53