36
10 Diagnostics and servicing
VEGAPULS C 11 • Two-wire 4 … 20 mA
58340-EN-200806
Code
Text message
Cause
Rectification
M510
No communication with
the main controller
Communication between main electronics
and display module disturbed
Check the connection cable to the display
Send instrument for repair
M511
Inconsistent software
configuration
A software unit requires a software update Carry out software update
10.5 Treatment of measurement errors
The tables below give typical examples of application-related meas-
urement errors.
The images in column "
Error description
" show the actual level as a
dashed line and the output level as a solid line.
1
2
Level
time
0
1 Real level
2 Level displayed by the sensor
Note:
If the output level is constant, the cause could also be the fault setting
of the current output to "
Hold value
".
If the level is too low, the reason could be a line resistance that is too
high
Liquids: Measurement error at constant level
Fault description
Cause
Rectification
Measured value shows a too
low or too high level
Level
time
0
Min./max. adjustment not correct
Adapt min./max. adjustment
Incorrect linearization curve
Adapt linearization curve
Measured value jumps to-
wards 100 %
Level
time
0
Due to the process, the amplitude of the
level echo sinks
A false signal suppression was not car-
ried out
Carry out a false signal suppression
Amplitude or position of a false signal
has changed (e.g. condensation, build-
up); false signal suppression no longer
matches actual conditions
Determine the reason for the changed
false signals, carry out false signal sup-
pression, e.g. with condensation.
