16
13� Troubleshooting
Malfunction
Cause
Remedy
No power at the sensor
n
Break in wiring
n
Short circuit
n
Check KNX power supply
n
Check connections
Sensor will not switch ON
n
Twilight setting in night
mode during daytime
operation
n
KNX configuration
n
Detection zone not properly
targeted
n
Adjust setting
n
Check KNX configuration
n
Re-adjust
Sensor will not switch OFF
n
Continuous movement in
the detection zone
n
Light being operated is
located in detection zone
and keeps switching ON
as a result of temperature
change
n
Light being operated is
in manual override mode
(LED ON)
n
Check zone, adjust or fit
shrouds if necessary
n
Change zone, or fit shrouds
n
Deactivate manual override
Sensor keeps switching
ON/OFF
n
Light being operated is
located in detection zone
n
Animals moving in the
detection zone
n
Change zone or fit shrouds,
increase distance
n
Change zone or fit shrouds
Sensor responds when it
should not
n
Wind is moving trees and
bushes in the detection
zone
n
Cars on the road being
detected
n
Sunlight is shining on the
lens
n
Sudden temperature chang-
es due to weather (wind,
rain, snow) or air expelled
from fans, open windows
n
Change zone
n
Change zone
n
Mount sensor in a sheltered
place or change zone
n
Change detection zone,
change site of installation
Change in sensor's reach
n
Differing ambient temper-
atures
n
Adjust reach via reach
controller
(Fig� 7�1)
apply
shroud foils where neces-
sary
(Fig� 7�3)
