Electrical Connection; Connection Conditions; Supply Voltage - Endress+Hauser Liquiphant FTL31 IO-Link Operating Instructions Manual

Electrical connection

Does the device comply with the measuring point specifications?
• Process temperature
• Process pressure
• Ambient temperature range
• Switch point/measuring range
Are the measuring point identification and labeling correct (visual inspection)?
Is the device adequately protected against moisture and direct sunlight?
Is the device adequately protected against impact?
Are all mounting and safety screws securely tightened?
Is the device properly secured?
6 Electrical connection
6.1

Connection conditions

The measuring device has two modes of operation:
• Maximum point level detection (MAX): e.g. for overfill protection
The device keeps the electrical switch closed as long as the sensor is not yet covered by
liquid or the measured value is within the process window.
• Minimum point level detection (MIN): e.g. to protect pumps from dry running.
The device keeps the electrical switch closed as long as the sensor is covered by liquid or the
measured value is outside the process window.
Choosing the "MAX"/"MIN" mode of operation ensures that the device switches in a safety-
oriented manner even in the event of an alarm condition, e.g. if the power supply line is
disconnected. The electronic switch opens if the point level is reached, if a fault occurs or if the
power fails (quiescent current principle).
• IO-Link: Communication on pin 4; switch mode on pin 2.
• SIO mode: If there is no communication, the device switches to the SIO mode =
standard IO mode.
The functions configured in the factory for the MAX and MIN modes can be changed via
IO-Link:
• HNO/HNC hysteresis
• FNO/FNC window
6.2

Supply voltage

SIO mode
10 to 30 VDC
IO-Link mode
18 to 30 VDC
IO-Link communication is guaranteed only if the supply voltage is at least 18 V.
18
Liquiphant FTL31 IO-Link
Endress+Hauser