Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 171)

T400 Controller Facilities Manual

667/EB/20200/000 Page 17-11 Issue 9

(i) it will ignore the PV1 signal and revert to normal unlinked operation

and only recognise the PV1 signal again if it is now released and re-

applied.

(ii) it can operate in self resetting mode i.e. once the override timer expires

it reloads itself, introduces the Link Delay and Link Window times and

commences re-timing when either the Window time expires or the

controller returns to vehicle green as a result of serving a Pedestrian

demand during the Window period. If PV1 is released and reapplied

normal linked operation resumes.

The Override timer is usually used only for MCE 0125 pelicans and its use is

determined by checking for a non-zero timing value. There is another watchdog

mechanism used for MCE 0145 pedestrian controllers which checks that the link is not

permanently operated nor permanently released. This mechanism will be used if there is

a non-zero timing value for the Link Failure Active/Inactive times. Timeout of either of

these signifies “link failure” which causes the following actions:

Inhibit the appearance of the Pedestrian Phase.

Light the Wait Indicator

Light the Cabinet Alarm Lamp

Set a Fault Log Flag

After a “link failure”, manual intervention is required to reset the fault log before the

controller can resume normal operation.

In certain circumstances e.g. light traffic flow, the intersection controller will be unable

to generate link inhibit release pulses often enough to prevent the timeout of a Fail

timer and in these cases a pulse generator is required in the main controller to signify

that the link is good. The pulse generator must ensure that the link inhibit is released

and reapplied periodically to reset both the FAIL ACTIVE and FAIL INACTIVE link

fail timers. To ensure that this pulse generator does not cause the link inhibit signal to

be released erroneously certain timing restrictions are imposed on the pulses and

signals:

20ms < inhibit release pulse ≤ 300ms

inhibit release signal ≥ 340ms

This means that if the signal on this line is released for less than 300ms and then

reapplied the only effect will be to reset the Link Fail Active and Inactive timers. If the

signal is released for more than 340ms and then reapplied, then the effect will be to

reset the Link Fail Active and Inactive timers and to start the Link Delay timer.

Local Link Dim Request

This input signal is treated in the same manner as UTC Dim Override (DO) and is

described in section 17.10.1.

Local Link Ped. Demand (LD)

This input signal puts in a remote pedestrian demand.

1 2 ... 166 167 168 169 170 171 172 173 174 175 176 ... 307 308

Sin comentarios

Siemens EH.75M.11. Especificaciones Pagina 171