Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 83)

T400 Controller Facilities Manual

667/EB/20200/000 Page 9-23 Issue 9

When the inhibit period is not specified, then irrespective of the normal cyclic stage

sequence, priority demands which are received after the commencement of a priority

change, will be serviced in cyclic order based upon the priority demands and after any

priority extensions (subject to the priority maximum running period) are satisfied. An

exception may be made for LRVs - see Section 9.4.6(a).

An inhibit period will only be introduced when a priority change has lead to a running

phase being prematurely terminated or a demanded phase has been omitted.

In the case of a controller having 5 or more stages, the inhibit period may be

introduced following any priority change, irrespective of curtailment or omission of a

stage.

The inhibit period will be terminated either after a pre-selected period has elapsed,

which period shall be adjustable by means of a switch(es) or other approved means

over the range 30 to 150 seconds in not more than 10 second steps, or by right of way

being granted to the priority phase whichever occurs first.

A priority demand stored during the inhibit period will be cancelled if the demanded

phase is served at the normal VA level during the inhibit period (this will also cancel

the inhibit period).

A preselected extension (the compensation period) to the normal maximum running

period will, when specified, be given to nominated phases the first time they run

following a priority change, if they were curtailed or omitted by the priority change.

The compensation periods will be adjustable over the range 0 to 30 seconds, in not

more than 2 second steps, selected individually for each signal phase for which

compensation is specified. This may alternatively be effected by switching the

maximum phase running period(s), in which case the timing increments may be

seconds. Different phases may be compensated as a result of priority changes to each

priority phase.

In the case of a controller having 5 or more stages, the compensation period may be

given following any priority change, irrespective of curtailment or omission.

If a compensation period is curtailed by a priority change, the compensation period

may be reapplied on the next cycle.

If the compensation periods are required on a phase as a result of two separate priority

changes, these compensation periods will run concurrently.

Each signal phase omitted or curtailed by a priority change will always be serviced in

the normal cyclic order following a priority change.

The receipt of a priority extension request, during an inhibit period, for a running

priority phase will result in a priority extension and priority max running period being

introduced.

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Siemens EH.75M.11. Especificaciones Pagina 83