Busch-Watchdog presence detector Type: 6131-74-101

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ABB i-bus ® EIBBusch-Watchdog presence detectorType: 6131-74-101Channel adjustmentsThe setting of the threshold for the lightsensor as well as the recovery timecan be carried out using thepotentiometer at the back of thepresence detector. There is a separatesetting aid for this purpose. Theillumination threshold is defined forchannel 1 with the “Lux1potentiometer”. The “HVACpotentiometer” presets the illuminationthreshold for channel 2. The“Illumination potentiometer” sets therecovery time for both channels.Alternatively, the settings can becarried out in ETS. To do so, theadjustment parameters should bechanged from “... potentiometer” to“ETS”.With the parameter “Thresholdillumination adjustable with”, thebrightness value that triggers thepresence detector can be indicated.Values between 5 lux and 1000 luxcan be entered. The recovery time canbe set with the two parameters “Timebase of recovery time” and “Time factorof recovery time”. The recovery time isproduced from the base and the factor:Recovery time = Base * FactorBrightness-dependent switchingA further communication object canalso be enabled separately for eachchannel with the parameter “Activationobject brightness dependentswitching”. If the communication object“Brightness dependent switchingchannel ...” receives a “1”, thepresence detector switches on withoutdependence on brightness. Thethreshold settings that have beencarried out with the potentiometer atthe rear of the device or with ETS, donot have any significance for theduration of the activation. If a “0” isreceived at the object, the presencedetector only sends “On” telegramsagain once the brightness value hasfallen below the illumination threshold.Light sourceWith an increasing proportion ofexternal light, the presence detectorsends an “Off” telegram as soon as theexternal light has reached the requiredilluminance. The type of light sourcemust be indicated for this purpose.Example:Illuminance 500 luxThe illumination threshold of 500 lux ispreset via the potentiometer on thepresence detector or via the ETSprogram.If movement is now detected in a darkroom in the morning and thebrightness value lies below 500 lux,the presence detector sends an “On”telegram when it records movement.a) switched light source:When the luminaires are switched on,they generate a luminance of 500 lux.The external light coming in is addedto this. The presence detector switchesoff if it measures a luminance level of1000 lux.b) controlled light source (constantbrightness):If a conventional constant brightnesscontroller is built into the luminaires,this regulates the proportion of artificiallight so that the measured luminancestays constant at 500 lux. If thepresence detector now records ameasurement of more than 500 lux,the luminaires have already beendimmed down to the minimumbrightness value and are switched off.MonitoringIt is possible to activate a monitoringfunction. To do so, the generalparameter ”Monitoring function” mustbe set to “yes”. The monitoring functionrepresents a “quasi alarm signal”which is not triggered when thesmallest thermal movement is detectedbut when a strong energy source isregistered by the presence detector ina short space of time or several weaksources are detected during a longerperiod.May 2002 2 - 71
ABB i-bus ® EIBBusch-Watchdog presence detectorType: 6131-74-101If the monitoring function is activated, afurther communication object isavailable “Signal / Telegr. ...”. Thepresence detector records the intensityand number of movements within atime period and only sends telegramswhen a set sensitivity level has beenexceeded.On a further parameter page“Monitoring function”, it is possible toset the type of the monitoring object(1 bit or 1 byte), the type of telegram atboth the start and end of detection aswell as the cyclical sending behaviour.The parameter “Threshold” indicatesthe sensitivity range. The value “0”denotes maximum sensitivity while thevalue “255” means minimumsensitivity.It can also be parameterised when thepresence detector switches to themonitoring function once it has beenactivated. This period is againcomposed of a time base and factor inthe same way as the cyclic time.If the monitoring function should beenabled externally, this can be carriedout with the communication object“Signal / Activation”. To do so, theparameter “Activation objectmonitoring” must previously be set to“available”.Bus voltage recoveryThe states of the communicationobjects “Movement channel ... / Telegr.switch” adopt a defined status on busvoltage recovery. The states ofchannels 1 and 2 can be definedseparately. There are thus nounnecessary switching operations onbus voltage recovery.Defined states can also be selected forthe objects “Brightness dependentswitching channel ...”. The parametersare only visible if the objects havepreviously been enabled.2 - 72 May 2002
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Busch-Watchdog presence detector Type: 6131-74-101

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