Integrated Constant Light Level Control (Dimming) - Siemens 5WG1 258-2EB22 Technical Product Information

Integrated constant light level control (dimming)

The luminance of the day light falling through a window into a room decreases in the room with the
distance from the window.
Depending on lamp type, the lighting is
controlled to the preset brightness value
via dimming actuators or switch-
ing/dimming actuators. The brightness
setpoint may be configured via a parame-
ter or set via a communication object.
For optimum use of the day light penetrat-
ing the room the presence detector with
constant light level control offers the op-
tion to control a main lighting group di-
rectly and up to four additional lighting control groups each via their own characteristic curve and their
own controller (master/slave operation).
All lighting groups are dimmed to the same set point value. This allows controlling the light level in a
room with only one presence detector with constant light level control. Depending on the relative dis-
tance of the additional lighting groups to the window compared to the main lighting group, each of
these additional lighting groups has to be dimmed
brighter or darker than the main lighting group.
Firstly, this requires determining the installation posi-
tion of the presence detector. The presence detector
can be installed on the ceiling at any of the positions
A - E. The position of the presence detector determin-
ing the main lighting group is in principle freely se-
lectable. Yet, it should be close to the window allow-
ing the best measurement of the daylight contribu-
tion.
For master/slave operation the day light curve under
lighting groups A – E has to be captured. For this
purpose the artificial lighting has to be completely
turned off, such that just the natural day light is illuminating the room. Ideally, the day light is evenly
falling into the room (no sharp shade / sunlight edges), bright, and diffused, e.g. at noon on a bright day
with overcast sky. Under each lighting group the luminance (Lux) has to be measured manually and
these values have to be entered into ETS.
The control characteristic curve for the additional lighting groups has to be determined without day light.
For that purpose the room has to be completely darkened or the characteristic curve has to be deter-
mined at night. Sending a start signal to communication object 71 starts the determination of the charac-
teristic curves. The presence detector automatically generates 15 discrete control values in the range
0%...100% for each constant light level controller of the main and additional lighting groups. The control-
lers send dimming values to the corresponding lighting groups and the presence detector measures the
resulting luminance level. The period for the measurement can be configured between 10 and 60 s.
Operation via infrared (IR) remote control
The IR receiver integrated in the presence detector can control light
and shade, as well as store and call up scenes via a special IR remote
control.
The IR commands implemented can be combined via communication
objects with the other function blocks or used to control other devic-
es. The functionality of button pairs A to F will be configured via the
ETS.
Channel F can be used optional to enable the programming mode.
Siemens AG
Building Technologies Division
Control Products and Systems
P.O. Box 10 09 53, D-93009 Regensburg
UP 258E22, UP 258D12, UP 255D21
ã Siemens AG 2015
Subject to change
Update: http://www.siemens.com/gamma-td
5 / 12
January 2015