Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 43)

T400 Controller Facilities Manual

667/EB/20200/000 Page 4-1 Issue 9

4. DEMANDS AND EXTENSIONS

4.1 GENERAL DESCRIPTION

Demands may be inserted for phases or stages, but extensions may only be inserted for

phases. Demands will only be acted upon when the relevant phase or stage is not

active, whereas extensions will only be acted upon when the relevant phase is active.

4.2 TYPES OF DEMANDS

4.2.1

Latched

The demand remains active until the phase or stage is served.

All priority demands are latched irrespective of the current mode. In order to provide

an unlatched facility special conditioning is required (see Section 9.4 for reference).

4.2.2

Unlatched

The demand is cleared if the demand condition ceases before the phase or stage is

served.

Any maximum green timers started by an unlatched demand will be reset if all of the

opposing demands are cleared.

4.3 ORIGINS OF DEMANDS AND EXTENSIONS

4.3.1

On-Street Detection Equipment

This refers to the approach detectors at the intersection. Figure 21.7 illustrates the

requirements of the detectors for the inter-section in section 21.

4.3.2

Pedestrian Push-Buttons

These insert latched demands and also illuminate the WAIT indicators of their

respective pedestrian phases.

If it is required, it is possible to illuminate the WAIT indicator without inserting a

demand or conversely insert a demand without illuminating the WAIT indicator.

In the example in Figure 21.7 push-buttons 1 & 2 are required to demand pedestrian

Phase G.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 307 308

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Siemens EH.75M.11. Especificaciones Pagina 43