Replacing background luminance sensor - LM21 - FD70

FD70 Configuration and Maintenance Guide
Product status
Document code
M212222EN
Revision
J
ft:locale
en-US
Product
FD70
Document type
User guide
  • 4-mm Allen key
  • 5-mm Allen key

Make sure that you have the replacement spare part available.

If the sensor is damaged, replace it with a new one.
  1. Switch off both AC (mains) power switch and battery switch.

    Make sure that there is no AC (mains) power available for the system.

    1
    Battery switch
    2
    AC (mains) power switch
  2. Disconnect the cable from the sensor.
  3. Remove the sensor and replace it with a new one.
  4. Connect the cable to the sensor.
  5. If the viewing direction of the background luminance sensor needs fine-tuning, adjust it by turning the mounting bracket of the sensor. Tighten the screws after the adjustment.
    LM21 mounting requirements
    Property Description
    Orientation

    Avoid direct and reflected sunlight into the sensor

    Avoid facing runway lights directly
    Tilt angle Slightly above the horizontal level
  6. Power up the system.
  7. Verify operation.