Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 181)

T400 Controller Facilities Manual

667/EB/20200/000 Page 18-4 Issue 9

Detectors

Siemens (ST) Self Tune Detectors MkII 667/1/17180/012 = 2 detector channel unit

667/1/17180/014 = 4 detector channel unit

Microsense (ST) Self Tune Detectors 667/7/20360/002 = 2 detector channel unit

(Type MSE) 667/7/20360/004 = 4 detector channel unit

Sarasota AT25Z 654/4/01027/000 = 1 detector channel unit

Sarasota MCE25Z Single Detector Channel Unit

26Z 2 Detector Channel Unit

28Z 4 Detector Channel Unit

Sarasota MTS35Z Single Detector Channel Unit

36Z 2 Detector Channel Unit

38Z 4 Detector Channel Unit

18.7 SIGNAL DIMMING

Signal dimming is provided to dim the signals during darkness hours under control of a

photo-electric cell mounted on a signal head.

There are three values of dimming voltage available:

• 120V

• 140V

• 160V (preferred value)

The type of dimming transformer required depends on the value of the dimming

voltage and the total average power load on the controller. For selection of the

Dimming Transformer see the General Handbook 667/HB/20200/000.

Figure 21.1 indicates where to specify the dimming voltage required.

18.7.1 Dimming by Time of Day

The dimming facility may be operated by time of day rather than a light operated

switch (Solar Cell). To allow this facility to be implemented, the Solar Cell input of the

controller must be wired to mains supply voltage to switch the controller to ‘DIM’

permanently. This state is then ‘overridden’ by special conditioning to switch the

controller to the Bright State.

Normally, the time of dim state change is ‘hard coded’ into the special conditioning

(using the special conditioning compare facility to compare the RTC to a fixed value).

Although this means that if the time of the dim state change needs to be changed, the

controller will need to be re-configured, the advantage is that changing the MTC

timetable will not alter the dimming facility.

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Siemens EH.75M.11. Especificaciones Pagina 181