Troubleshooting; Fault Diagnostics On The Electronics Insert - Endress+Hauser Liquicap M FTI51 Operating Instructions Manual

Liquicap M FMI51, FMI52
!
!
LEDs for diagnostics
1 2 3 4 5
green green red green green
On
On
On On
On
On On
On On
On On On
On
* Applies to electronic insert FEI52 only.
** No connection to the sensor DAT (EEPROM) could be established.
Endress+Hauser
9

Troubleshooting

9.1

Fault diagnostics on the electronics insert

Note!
In the event of faults during commissioning or operation of the device, you have the ability to carry
out fault diagnostics on the electronic insert. This function is supported by the electronic inserts
FEI52, FEI54, FEI55 (see fault tables 1 and 2 below).
The electronic inserts FEI53 and FEI57S signal two types of faults:
• Correctable faults: The red LED flashes.
• Non-correctable faults: The red LED is lit continuously.
For additional information on fault detection and fault elimination, refer to fault table 2 below.
9.1.1 Activating fault diagnostics
Note!
The diagnostics provide information about the operating status of the device. The results of the
diagnostics are displayed by LEDs 1, 2, 4 and 5. If the diagnostics detect multiple faults, these are
shown according to their priority. A serious fault (e.g. priority 3) is always displayed before a less
serious fault (e.g. priority 5).
To activate the fault diagnostics, proceed as follows:
1. Set the function switch to position 1 (operation).
2. Press the "–" key.
3. The "Fault table 1" lists possible causes of faults and information for eliminating them.
Fault table 1 (FEI52, FEI54, FEI55)
6 Cause
yellow
No fault.
Internal fault.
The calibration point is too close to the
measuring range limit.
No calibration has yet been carried out.
The DC PNP output is overloaded.*
The capacitance change from "Probe not
covered" to "Probe covered" is too small.
Sensor DAT (EEPROM) data are invalid.
Probe is not detected.**
The measured temperature is outside the
permitted temperature range.
Fault table 2 (FEI53, FEI57S)
Cause
The device does not switch.
Alarm LED flashes.
Water in the housing.
Remedy
The device is defective.
Reduce the switch point or select a new installation
location.
Carry out empty and/or full calibration.
Reduce the connected load.
The capacitance change between the uncovered and
covered probe must be greater than 2 pF.
Carry out download from the electronic insert.
This probe type is not compatible. Use a Liquicap M
probe.
The device may be operated in the specified
temperature range only.
Remedy
Check the connection and the supply voltage.
The ambient temperature of the electronics is outside the permitted range or the
connection to the probe is interrupted.
Dry the housing and ensure that the cable gland is pulled tight and the housing
cover is tightly sealed.
Troubleshooting
Priority
1
2
3
4
5
6
7
8
67