Diagnostics And Troubleshooting; Diagnostic Information Via Led Display; Maintenance; Cleaning - Endress+Hauser Liquiphant FTL31 Anleitung

Liquiphant FTL31
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
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.
Endress+Hauser
Diagnostics and troubleshooting
Corrective action
Check connector, cable and power supply
• Rectify short-circuit
• 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.
63