Diagnostics and troubleshooting Nivotester FTL325P, 3-channel
36 Endress+Hauser
9 Diagnostics and troubleshooting
Does not switch
• Possible cause: no supply voltage present (green LED is not lit)
Corrective measure: check supply voltage
• Cause: electronics are defective
Corrective measure: replace Nivotester
• Cause: welded contacts (following a short-circuit)
Corrective measure: replace Nivotester; install fuse in contact circuit
• Cause: sensor is defective
Corrective measure: replace sensor
Switches incorrectly
Possible cause: switch on Nivotester for limit signal is incorrectly set
Corrective measure: correctly set the switch behind the front panel on the Nivotester
Continuous fault signaling
• Possible cause: short-circuit or disconnect in the signal line to the sensor
Corrective measure: check signal line
• Possible cause: sensor electronics are defective
Corrective measure: replace electronics
• Possible cause: Nivotester is defective
Corrective measure: replace Nivotester
Switches incorrectly following power failure
Possible cause: electronic insert, behavior during power-up test (proof test)
Corrective measure: observe switching behaviour at electronic insert
Block system control after power failure for approx. 45 s
10 Maintenance
10.1 Maintenance schedule
As a general rule, no specific maintenance work is required.
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