Rectify Faults - Siemens SITRANS LG260 Operating Instructions Manual

Code Cause
Text mes-
sage
M506 – Error during setup
Installation/
Setup error
M507 – Error during setup
– Error when carrying out a
Error in the
reset
instrument
settings – False signal suppression
faulty
Reaction when malfunc-
tion occurs
Procedure for fault recti-
fication
Check the 4 ... 20 mA
signal
Error
4 ... 20 mA signal not sta-
ble
4 ... 20 mA signal missing
Current signal greater than
22 mA or less than 3.6 mA
Treatment of measure-
ment errors
56
Rectification
– Check and correct instal-
lation and/or parameter
adjustment
– Check probe length
– Carry out reset and repeat
setup
9.4

Rectify faults

The operator of the system is responsible for taking suitable meas-
ures to rectify faults.
The first measures are:
•
Evaluation of fault messages, for example via the display and
adjustment module
•
Checking the output signal
•
Treatment of measurement errors
A PC with the software PACTware and the suitable DTM or the soft-
ware PDM with a suitable DD offer further comprehensive diagnostics
options. In many cases, the reasons can be determined in this way
and faults can be rectified.
Connect a multimeter in the suitable measuring range according to
the wiring plan. The following table describes possible errors in the
current signal and helps to eliminate them:
Cause
– Fluctuations of the
measured variable
– Electrical connection
faulty
– Voltage supply missing
– Operating voltage too
low or load resistance
too high
– Electronics module in
the sensor defective
The below tables show typical examples for application-relevant
measurement errors. There are two measurement errors:
•
Constant level
•
Filling
•
Emptying
SITRANS LG260 - Operating Instructions
Rectification
– Set damping appropriate to the instrument via the
display and adjustment module or PACTware/DTM
– Check connection according to chapter "Connection
steps" and if necessary, correct according to chapter
"Wiring plan"
– Check cables for breaks; repair if necessary
– Check, adapt if necessary
– Exchange the instrument or send it in for repair
DevSpec State in CMD 48
Bit 6 of Byte 14 ... 24
Bit 7 of Byte 14 ... 24
PBD-51041057