FT-70 Fill Level Inspector Service Manual
8-30
• If the detector power supply is off, the detector is not getting
power from the Main Power Supply Board. Test the Main
Power Supply Board.
• If the detector power supply led is green, the power supply is
functioning properly. Check the detector because the crystal in
the detector has failed. Replace the SSD.
Optical Sensors: False triggers suddenly increase, or reject
timing malfunctions occur
1. Inspect and clean the lenses. Use a cotton swab and isopropyl
alcohol to clean the lense. If the lense is scratched, chipped,
cracked, or discolored, replace it.
2. Fiber optic strands in the cable may be broken. Remove the
cable from the sensor amplifier and shine a flashlight into the
lense. Looking at the cable end you removed, the light should
be solid and round. If there are any dark spots, the cable
contains fiber optic strands. Replace the cable.
Proximity Sensors: No triggering occurs
1. Check LED 7 on the processor board. If the LED blinks when a
container passes under the sensor, the sensor is working.
Check to be sure the sensor height is set properly. See Chapter
6: FT-70 Calibration Procedures for more information.
2. The height of the sensor has been changed. Check to see that
the FT-70 head height has not been altered. See Chapter 6:
FT-70 Calibration Procedures for more information.
Encoder Troubleshooting
1. The encoder has a built in diagnostic that displays Error 22
when the encoder has failed and must be replaced.
2. If the rejector timing is erratic and you are certain all settings
are configured properly, the encoder may not be installed
properly, or the encoder coupling may be slipping.
Industrial Dynamics Company, Ltd. © 40256-0600
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