User Manual

CM1N5482E / 10.1998 Siemens Building Technologies
2/8 Landis & Staefa Division
The QPA82.1 presence detector has an infrared sensor which detects changes in
passive infrared radiation in the space, which are then converted into electric control
pulses.
It captures changes in the thermal pattern caused by the smallest physical movements.
This is achieved by making a comparison of the thermal radiation of the moving infrared
source (person, vehicles, etc.) and the constant thermal radiation of the environment.
The detection zone is subdivided into a normal zone and an extended zone (refer to
illustrations under «Engineering notes»).
In the normal zone, the unit's sensitivity is sufficient to detect the movements of a
seated person.
If the detector shall only respond to walking motion, the extended zone must be used.
The detector has two independent outputs:
A non-potential-free contact (AC 230 V) is used for the control of a lighting system.
To switch the lighting on and off, the detector also acquires the brightness of daylight.
Using an optical filter, the detector is able to differentiate between infrared-poor artificial
light (e.g. fluorescent or high efficiency lamps, but no incandescent or halogen lamps)
and daylight.
The minimum brightness can be adjusted from 50 to 1600 Lux. If the daylight falls below
the adjusted minimum brightness for a certain period of time, the artificial light will be
switched on with no delay if a person is present.
The switch off delay is ascertained by the self-learning unit: If only a few movements are
detected, the switch off delay may be a maximum of 15 minutes. If many movements
are detected, it will be reduced to 5 minutes.
If the daylight exceeds the adjusted minimum brightness, the artificial light will be
switched off. The unit responds only slowly to changes in daylight to avoid frequent and
irritating switching on/off actions.
A potential-free contact is used for HVAC functions. It is independent of the intensity of
daylight. If a person enters the unit's detection zone, the contact will close after a certain
switch on delay time has elapsed (adjustable from 0 to 300 seconds), which activates
the respective HVAC unit. If the person leaves the detection zone, the contact will open
after a certain switch off delay time (adjustable from 0.5 to 30 minutes) and the HVAC
unit will be deactivated.
When ordering, please give name and type reference of the presence detector.
The unit consists of an upper and a lower housing section and a mounting frame.
Upper and lower section are attached together and secured by a clamp.
The mounting frame is placed between the upper and the lower section.
The electrical connections are established via pins.
The upper housing section contains the actual detector. It consists of a white plastic
casing which accommodates a plastic insert with the integral Fresnel lenses and an
insert with the pyroelectric sensors, microelectronics, setting potentiometers, securing
clamps and pins.
The lower section houses the power part. It is designed for fitting into a recessed
conduit box (single conduit box of 58 mm dia.).
Functions
Control output
for lighting
Control output for HVAC
Ordering
Mechanical design