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LP21/LP22 Installation instructions en Sensors
8 Description of functions
In the following section the indicator and control elements are described.
Information in this document
This document refers to the default settings or default values defined by the manufacturer. The factory
settings of customer variants may differ from the manufacturer’s specifications. Please observe the
instructions on the device, as well as the documents supplied with it.
8.1 LED status indicators
The LEDs (light emitting diodes) on the front side indicate the state of the loops and the detector.
There are two LEDs for each loop channel:
• The red LED indicates the coverage status of the respective loop
• The blue LED indicates the operating status of the detector
No power supply, detector inactive
Detector ready, loop connected, no object detected
Detector ready, loop connected, object detected
No loop connected, loop break, loop closure
Ready for operation following earlier, now rectified, loop error
Frequency alignment is running
After frequency adjustment, both LEDs simultaneously display the set loop
frequency in a flash code (see Flash code illustrated example)
Tab.6: LED signal colours
LED flash code following a frequency alignment
Fig.8: LED display of loop frequency
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