Endress+Hauser Levelflex M FMP40 Function Manual page 77

Levelflex M
Endress+Hauser
Code Description
A261 HF cable defective
W275 offset too high
W512 recording of mapping -
please wait
W601 linearization ch1 curve not
monotone
W611 less than 2 linearization
points for channel 1
W621 simulation ch. 1 on
E641 no usable echo
channel 1
check calibr.
W650 signal/noise ratio too low
or no echo
E651 level in safety distance - risk
of overfill
A671 linearization ch1 not
complete, not usable
W681 current ch1 out of range
Possible cause
HF cable defective or HF connector loose
temperature at the electronics too high or
HF module defective
recording active
linearization not monotonously increasing correct linearization table
number of entered linearization points < 2 correct linearization table
simulation mode is active
echo lost due to application conditions or
buildup on probe
noise amplitude too high
level in safety distance
linearization table is in edit mode
current out of range
(3.8 mA to 21.5 mA)
15 Trouble-shooting
Remedy
check HF connector, replace cable if
defective
check temperature, replace HF
module if defective
wait a few seconds until alarm
disappears
switch off simulation mode
check basic setup;
clean probe (see Operating
Instructions, Troubleshooting)
eliminate electromagnetic
interference
alarm will disappear as soon as level
leaves safety distance
perform reset where necessary
activate linearization table
check basic setup and linearization
77