Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 166)

T400 Controller Facilities Manual

667/EB/20200/000 Page 17-6 Issue 9

17.6 WAIT INDICATORS

This facility allows the user to select (via the handset) whether the wait indicator is

illuminated by any of the following demands:

- Pushbutton ped demands

- UTC ped demands

- Manual Panel ped demands

- Local Link ped demands

- Handset ped demands

17.7 AUDIO CONTROL AND MONITOR

An output activates the audio unit during the ped. steady green time (MCE0125 only).

An input monitors the drive voltage to the audio unit and a check is made that the

monitored state corresponds with the requested state. Repeated failure of the check

causes the lamps to be turned off within 500mS (from the point at which the first

occurrence of the fault was detected) and an entry made in the fault log. Since the

audio drive is derived from the pedestrian green supply, turning the signals off removes

the audio drive.

These is one audible drive circuit per 2 phase driver board, and each can drive upto 6

audibles (assuming each is 2kΩ).

In the interests of safety, when the audibles are off, one set of relay contacts ‘short’ the

cable pair driving the audibles, and the other set connects a 1kΩ resistor across the

supply driving the audibles.

This audio drive can also be used to control Tactile Units, see Figure 18.3.

17.8 GREEN CONFLICT FAULT ACTION

On detection of a green conflict (as indicated by monitoring the output of the green

conflict PROM) the controller turns all the controller lamps and audio indicators off.

The lamps will remain off until manually reset, using the handset, turning the power off

and then restoring the power.

17.9 RED LAMP MONITORING

The each pelican stream has upto four seperately monitored vehicle red drives, known

as the four red lamp monitor ‘channels’. The current flowing through the vehicle red

lamps is monitored to check that there is at least one vehicle red lamp showing per

channel while there is a steady green signal showing to pedestrians. If a fault occurs,

the controller turns the signals and the audio indicators off for that pelican stream. The

lamps will remain off until manually reset, using the handset, turning the power off and

then restoring the power.

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Siemens EH.75M.11. Especificaciones Pagina 166