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Diagnostics and troubleshooting
28
12
Diagnostics and troubleshooting
12.1
Troubleshooting
If an electronic/sensor defect is present, the device changes to error mode and displays the
diagnostic event F270. The status of the process data is rendered invalid. The switch
output(s) is/are opened.
General errors
Error
Possible cause
Device does not
Supply voltage does not match the value indicated on
respond
the nameplate.
The polarity of the supply voltage is wrong.
Connecting cables are not in contact with the termi-
nals.
No communication
• Communication cable not connected.
• Communication cable incorrectly attached to device.
• Communication cable incorrectly attached to the IO-
Link master.
No transmission of
There is an error in the device.
process data
12.2
Diagnostic information via LED indicator
LED indicator on housing cover
Malfunction Possible cause
Green LED
No power supply
not lit
Overload or short-circuit in load circuit
Red LED
flashing
Ambient temperature outside of speci-
fication
Test magnet held against marking for
too long
Red LED
Internal sensor error
lit
12.3
Diagnostic events
12.3.1
Diagnostic message
Faults that are detected by the device' s self-monitoring system are displayed as a
diagnostic message via IO-Link.
Solution
Apply correct voltage.
Correct the polarity.
Check for electrical contact
between cables and correct.
Check wiring and cables.
Correct errors that are dis-
played as a diagnostic event.
Corrective action
Check plug, cable and power supply.
• Clear the short-circuit.
• Reduce maximum load current to below 200 mA if
one switch output is active.
• Maximum load current = 105 mA per output if both
switch outputs are active.
Operate measuring device in specified temperature
range.
Repeat function test.
Replace device.
Liquipoint FTW33
Endress+Hauser
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