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T400 Controller Facilities Manual

667/EB/20200/000 Page 9-33 Issue 9

9.5 HURRY CALL MODE

A hurry call demand gives precedence to a particular stage to ensure that a green signal

is given to certain vehicles. Hurry calls may be used at junctions, e.g. near to fire or

ambulance stations, to ensure that certain vehicles are given right of way, or in

conjunction with queue detectors, to prevent blocking of a junction.

Two hurry calls (0 and 1) are available. They must be allocated a higher priority than

VA and Hurry Call 0 will have higher priority than Hurry Call 1. Timings associated

with the hurry calls are:

(a) Hurry call delay - the period between receipt and implementation of a hurry call

(DHC). The implementation of the Hurry Call is the point at which the

controller accepts the hurry call request and lights the hurry active LED.

(b) Hurry call hold - the period that the hurry call stage is maintained following

selection (HHC).

which a repeat of the same hurry call is prohibited (PHC).

(d) Hurry call request watchdog, i.e. a request for a hurry call mode persisting for

longer than the request watchdog period will cause the hurry call mode to be

unavailable and an entry made in the fault log. Hurry call mode will be

unavailable until hurry call fault log entries are cleared.

(e) Hurry call watchdog, i.e. period for which the controller may remain in a hurry

call mode. If the controller remains in hurry call mode for longer than the

watchdog period, the hurry call mode will become unavailable and an entry

made in the fault log. Hurry call will be unavailable until hurry call fault log

entries are cleared.

(f) Hurry call call/cancel facility; Special conditioning can also provide a call

cancel facility for the hurry call input, i.e. as long as the input is active, the

hurry call will act as normal. However, if the input goes inactive, this is taken

by special conditioning to be a cancel signal and the special conditioning then

sets true the cancel input for the hurry call. If the hurry call is cancelled, the

Prevent timer does not become active, so if required, this may also be

implemented in special conditioning.

Facilities (d), (e) & (f) can be provided by Special Conditioning for Export only.

The programmed values may be changed via the handset using the commands in

brackets. The periods for (d), (e) and prevent timer in (f) can be changed by use of the

command (PIR) for relevant conditioning timer, see the Handbook for the

Configurator for details of timers used, and any special conditioning libraries.

Immediately a valid hurry call is received, the HURRY ACTIVE indicator on the

manual panel illuminates and remains illuminated until the end of the hold period. A

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