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T400 Controller Facilities Manual

667/EB/20200/000 Page 19-7 Issue 9

Case 3 - Controller making transition to the Stage which

contains the Ped. with Audibles / Tactiles:-

The Stage will appear without the Ped. phase (All Red will

show if the stage is an exclusive Ped. Stage). On entering this

stage Case 2 will apply.

Following the above cases the pedestrian demands are inhibited

and wait indicators illuminated. The pedestrian phase will stay at

red until the fault has been rectified and Indication 2 becomes

inactive. i.e. the Pedestrian Stage will not appear.

For Indications 1 and 3 above, the LMU will extend the configured intergreens to the

relevant all red periods even if an all red extension is operating from the normal Extend

All Red facility. However, if the LMU causes an all red extension on a configured

stage change then the normal Extend All Red facility cannot then subsequently

introduce an additional extension during this all red period. (See also subsection 2.6.6

and 2.6.8).

19.2.1 Effect of RLM on Intergreens and Phase delays

When a red fail is indicated by the RLMU, subsequent stage to stage moves are

affected as described below.

A hold timer is started at the start of the interstage period, i.e. at the start of the amber

leaving or losing delay period as appropriate.

The hold timer has no effect on controller operation until a phase in the next stage is

about to go to red/amber and then all the intergreen and gaining delay timers are

suspended. The suspension is lifted when the configured hold time expires and then the

intergreen and gaining delay timers resume timing off the remainder of their periods.

Where losing delays are configured on a stage to stage movement, the hold timer is

increased by the longest losing delay on that move. Thus the required red period is

given even when the losing delays are changed.

NOTE To ensure a 5 sec. red period, the hold time should be configured as 8

sec. to allow for the 3 sec amber period.

If the intergreens are long, the hold timer will expire before the phase

intergreens and no additional clearance will be given.

The gaining delay timers and intergreen timers are all held to ensure

that the offsets between gaining phases are maintained.

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