Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 91)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-31 Issue 9

9.4.6(b) Request Delays

The first delay as indicated allows for the travelling time of the LRV from the request

detector to the junction. The first delay covers time which is not needed to process the

LRV request. This is normally due to the detector not being in the ideal position (for

instance due to an intervening stop). During the first delay, the controller takes no

action on the demand. The second delay which forms the later part of the overall delay

before the LRV actually reaches the junction, allows the controller to be prepared to

give instant service to the LRV. This is usually done by using special conditioning to

prevent any stage moves except to a stage which will serve the requested LRT phase.

See Figure 22.11 “During Second Delay Prevent Except Stage” column. This ensures

that the required stage move does not get held by other stage changes or have to wait

for other minimum green times to expire.

There are 8 sets of (1st and 2nd) delay periods (0 - 7) these are normally associated

with the respective priority units 0 to 7.

However, it is possible to allocate two or more sets of delays (2 or more inputs) to one

priority unit in special conditioning. See Figure 9.3.

9.4.6(c) Extend All Red Option

It is also possible to use priority demand inputs to special conditioning (see ‘B’ on

Figure 9.2) to extend the all red period between stages should a priority phase

terminate with a priority demand input still active. This facility provides time to ensure

that the LRV clears the junction. This is again achieved using the special conditioning

facility.

For further details on special conditioning libraries, see Configurator Handbook

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Siemens EH.75M.11. Especificaciones Pagina 91