Siemens EH.75M.11. Spezifikationen PDF herunterladen (Seite 36)

T400 Controller Facilities Manual

667/EB/20200/000 Page 3-7 Issue 9

3.5.3 Maximum Green (MAX,MBX,MCX,MDX)

A maximum green timer is provided for each vehicle actuated phase and commences to

time upon receipt of a demand for any opposing phase. If the opposing demand is

present when the phase gains ROW then the maximum green period will commence to

time off immediately.

Stage changes will not take place until the last maximum green timer for phases in that

stage have timed off, unless the associated phase runs in the new stage.

It is possible to program the controller so that a specified phase has a pre-timed

maximum green. This means that the maximum green timer will always run whenever

the phase is active, regardless of opposing demands.

A pre-timed maximum green is achieved by allocating a dummy phase to oppose the

specified phase. The dummy phase is not allocated to any stage and never appears.

When the specified phase gains ROW, an unlatched demand is inserted for the dummy

phase. This starts the maximum green timer of the specified phase. When the specified

phase loses ROW, the unlatched demand for the dummy phase is cleared.

The maximum green timer will only be effective during VA, Bus Priority and

Emergency Vehicle modes. During CLF mode it will be ignored. During UTC mode, if

it is not to be considered for special requirements, it is possible to configure it to be

held reset.

Four sets of maximum green timings are available. These are switched in and out as

required by the master time clock (see section 11).

The timing range is 0 to 255 seconds in 1 second steps.

3.5.4 Pedestrian Blackout/Flashing Green (PBT)

When a pedestrian phase terminates, the green man is followed by a preset blackout

period for U.K. (or flashing green for some countries abroad) which in turn is followed

by the red man. The blackout period is considered as part of the intergreen, i.e. the two

timers will run in parallel.

The timing range is 0 to 255 seconds in 1 second steps.

If no blackout/flashing green is required the timer should be set to 0 seconds.

Figure 21.3 illustrates the allocation of the above timing periods to phases.

3.5.5 Intergreen (IGN)

The intergreen period is a safety period between one phase losing ROW and another

phase gaining ROW. Only conflicting phase to phase transitions can have individual

intergreen timing values.

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Siemens EH.75M.11. Spezifikationen Seite 36