Diagnostics And Troubleshooting; Diagnostic Information Via Led; Display; Maintenance - Endress+Hauser Liquiphant FTL33 Operating Instructions Manual

Liquiphant FTL33
8

Diagnostics and troubleshooting

8.1 Diagnostic information via LED display
LED display on housing cover
Malfunction Possible cause
Green LED
No power supply
Not lit
Red LED Overload or short-circuit in
Flashing load circuit
Red LED Internal sensor failure or sensor
Lit corroded
LED display on M12 plug (available as an accessory)
Malfunction Possible cause
Green LED
No power supply
Not lit
Yellow LED
Not lit
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.
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
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 (for MIN operating mode)
• Tuning fork covered: yellow LED lit.
• Tuning fork not covered: yellow LED not lit.
Result (for MAX operating mode)
• Tuning fork covered: yellow LED not lit.
• Tuning fork not covered: yellow LED lit.
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