Endress+Hauser Liquiline Control CDC90, Operating Instructions Manual

Page: 92 / 118

Diagnostics and troubleshooting Liquiline Control CDC90
92 Hauser
Item Error message Troubleshooting
304 Invalid measured value 1. Check sensor power supply.
2. Restart device under Setup/Diagnosis/
Reset .
304 Measured value not available.
‣
Check connection between sensor and
transmitter.
305 Delta slope warning, measurement
can still take place. The calibration
indicates a large slope change in
the sensor. 1. Check sensor, replace if necessary.
2. Check buffer or electrolyte, replace if
necessary.
3. Repeat the calibration.
306 Sensor glass limit value exceeded.
Alarm impedance of glass
membrane too high. 1. Check pH sensor and clean if necessary.
2. Check setting for glass limit value and, if
necessary, correct under
Setup/Inputs/
Channel/Extended Setup/ Diagnostic
settings/Glass imp. (SCS)
.
3. Replace sensor
306 Warning: Sensor glass limit value
exceeded. Impedance of glass
membrane too low. Measurements
can be performed until the alarm
occurs. 1. Check pH sensor and clean if necessary.
2. Check setting for glass limit value and, if
necessary, correct under
Setup/Inputs/
Channel/Extended Setup/ Diagnostic
settings/Glass imp. (SCS)
.
3. Replace the sensor.
307 A major alarm has occurred in the
transmitter. Error message
available in transmitter.
307 A major warning has occurred in
the transmitter. Error message
available in transmitter.
308 A major warning has occurred in
the transmitter. Error message
available in transmitter.
309 Transmitter current error
310 Invalid measured value 1. Check sensor power supply.
2. Restart device under Setup/Diagnosis/
Reset.
400 Communication between control
unit and pilot valve manifold
canceled.
‣
Check connection between the devices.
401 An error has occurred during
calibration.
‣
Ensure that measurement remains stable,
calibration results are in the defined
warning limit, sensor is connected.
401 Calibration error has occurred
402 The connected sensor is not
supported for the calibration
function.
402 The sensor is not supported for an
automatic calibration.
403 No sensor selected for measuring
point.
403 No sensor selected for channel.
‣
Select a sensor for the channel.
404 The field device's calibration menu
is open.
‣
Close field device's calibration menu.
405 An error has occurred during
calibration.