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8
- Constant light switch
The constant light switch switches on lamps in the room as soon as movement of a person is detected and the desired brightness value is not attained by the
entering daylight alone. The programmed setpoint minus hysteresis is maintained as long as people are in the detection range. The application detects when the
entering daylight is sufficient. The lamps are then switched off again to save energy.
A
B
1
2
3
500 Lux
06:00
07:00
08:00
09:00
10:00
11:00
A
: Artificial light curve
B
: Sunlight curve
Control parameters:
1
: Setpoint (lx)
2
: Delay time after switch-on up to measurement of the artificial light component
3
: Minimum time above the switch-off threshold (minutes)
Fig. 2: Control parameters of constant light switch for one light row
To set up a constant light switch function certain parameters settings must be made which lead to dependencies. These dependencies are displayed in the
above diagram. A switch-off delay can be set. This time expires when the presence detector no longer senses movement.
After expiry, an OFF telegram is sent on the output. Connected lamps are switched off. The switch-off delay should always be higher than the "Delay after switch-
on up to measurement of the artificial light component" (2). In the worst case the light sensor would measure the artificial light component when the lamps are
switched off. This should be avoided since the entire constant light switching function is based on this value. The "Delay after switch-on up to measurement of
the artificial light component" (2) is to be used especially with lamps that take a few seconds to reach their full brightness. Fluorescent lamps require up to around
250 seconds, whereas incandescent lamps reach their full brightness almost immediately. The "Minimum time above the switch-off threshold" (3) ensures that
the natural light component attains a stable value before the artificial light is switched off. If this time is too short, this could lead to an unwanted activation and
deactivation of the lamps in the room.
Product description