Endress+Hauser Liquiphant FTL33 Bedienungsanleitung Seite 64

Diagnostics and troubleshooting
8 Diagnostics and troubleshooting
8.1 Diagnostic information via LED display
LED display on housing cover
Malfunction Possible cause
Green LED
No power supply
Unlit
Red LED Overload or short-circuit in
flashing load circuit
Red LED Internal sensor failure or sensor
Lit corroded
LED display on M12 connector (available as an accessory)
Malfunction Possible cause
Green LED
No power supply
Unlit
Yellow LED
Unlit
Internal sensor failure or sensor
corroded
Yellow LED
both lit
Connection: 2-wire AC/DC to 20 to 253 V DC
Malfunction Possible cause
Unexpected behavior Incorrect connector assignment or
of yellow LED incorrect cable wiring
9 Maintenance
No special maintenance work is required.
9.1 Cleaning
The sensor must be cleaned if necessary. It can also be cleaned while installed (e.g. CIP
Cleaning in Place / SIP Sterilization in Place). Care must be taken to ensure that no damage
occurs to the sensor in the process.
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Corrective action
Check connector, cable and power supply
• Rectify short-circuit
• Reduce maximum load current to below 250 mA
Replace device
Corrective action
Check connector, cable and power supply
• Check cable
• Reduce maximum load current to below 250 mA
• Replace device
Corrective action
Pay attention to the polarity of the power supply!
Correct connection:
Valve plug: L+ to PIN1, L- to PIN 3
Cable: L+ BK (black), L- BN (brown)
Result
• Tuning fork covered: yellow LED lit.
• Tuning fork not covered: yellow LED not lit.
Liquiphant FTL33
Endress+Hauser