Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 94)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-34 Issue 9

hurry call is valid provided its prevent timer is not active due to a previous hurry call

and the delay timer for any higher priority hurry call is not active. A cancel input for

each hurry call enables the process to be terminated any time during the delay, hold or

prevent periods.

There are two hurry call units available on the controller (0 & 1), the facilities

described below exist for both individual hurry call units.

The hurry call for a stage is normally generated from a remote push button or special

detectors but other calling conditions can be used, if required. On receipt of a hurry

call request the controller will go into Hurry Call mode after a preset delay - the hurry

call delay period - providing the controller is not in a higher priority mode.

On expiry of the hurry call delay period, the controller moves immediately to the

requested stage, subject to stage movement restrictions, provided the intergreen

timings and minimum green timings associated with phases in the currently running

stage have expired.

Extensions for running phases are ignored. If the requested move to the hurry call

stage is not permitted directly, the controller can be programmed to move via the all

red stage or other specified permitted stage movements to the hurry call stage. If the

move is accomplished via an alternative stage(s), these stage(s) terminate when their

phase minimum green timings expire. During the move to the called stage, any active

intergreen extensions are implemented.

With the hurry call stage selected, the condition is held for a preset period - the hurry

call hold period - irrespective of the condition of the minimum, extension and

maximum green timers for phases in the stage. At the end of the hold period, the

controller reverts to the highest priority mode whose operating conditions are active.

The hurry call is only considered to have been serviced when the required movement

has been active for the hold period. Thus, if the movement is cut short by a higher

priority mode, the request remains and is serviced after the higher priority mode unless,

in the course of operating in the higher priority mode, the cancel input is activated.

The prevent timer allows programming of the minimum period between repeats of the

same call. With the prevent timer for a call running, incoming calls are rejected. The

prevent timer commences to time at the same time as the hold timer.

Cancel input: An input can be configured to cancel the hurry call. If the cancel input

becomes active during the delay period, the controller will drop out of hurry call mode.

(N.B. If cancelled during the Hold period, the prevent timer is reset, thus the same

hurry call can cause hurry mode to become active again immediately, without waiting

for a prevent time to expire.)

Acknowledge/Confirm output: An output can be configured to confirm that a valid

hurry call request has been received and accepted. If the request is not accepted due to

any of the reasons mentioned below, the output will not become active to confirm.

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Siemens EH.75M.11. Especificaciones Pagina 94