VEGA VEGAPULS 68 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - two-wire - Manual (Page 59)

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9 Diagnosis, Asset Management and service
VEGAPULS 68 • 4 … 20 mA/HART - two-wire
36535-EN-130205
Code
Text mes-
sage
Cause Rectification
M500
Error with the
reset delivery
status
– With the reset to delivery
status, the data could not
be restored
– Repeat reset
– Load XML file with sensor
data into the sensor
M501
Error in the
non-active li-
nearization
table
– Hardware error EEPROM – Exchanging the electronics
– Send instrument for repair
M502
Error in the
diagnosis me-
mory
– Hardware error EEPROM – Exchanging the electronics
– Send instrument for repair
M503
Reliability too
low
– The echot/noise ratio is the
small for a reliable measu-
rement
– Check installation and
process conditions
– Clean the antenna
– Change polarisation
direction
– Use instrument with higher
sensitivity
M504
Error on an
device inter-
face
– Hardware defect – Check connections
– Exchanging the electronics
– Send instrument for repair
M505
No echo
available
– Level echo can no longer
be detected
– Clean the antenna
– Use a more suitable
antenna/sensor
– Remove possible false
echoes
– Optimize sensor position
and orientation
9.4 Rectify faults
The operator of the system is responsible for taking suitable measu-
res to rectify faults.
The first measures are:
•
Evaluation of fault messages, for example via the indicating and
adjustment module
•
Checking the output signal with 4 … 20 mA instruments
•
Treatment of measurement errors
Further comprehensive diagnostics options offer a PC with the soft-
ware PACTware and the suitable DTM. In many cases, the reasons
can be determined in this way and faults can be rectified.
Connect a handmultimeter in the suitable measuring range according
to the wiring plan. The following table describes possible errors in the
current signal and helps to remove them:
Reaction when malfunc-
tions occur
Procedure for fault recti-
fication
Check the 4 … 20 mA
signal