KROHNE SU 600, Руководство по эксплуатации

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7 Maintenance and fault rectification
SU 600 • 4 … 20 mA signal conditioning instrument
30652-EN-150129
7 Maintenance and fault rectification
7.1 Maintenance
If the instrument is used properly, no special maintenance is required
in normal operation.
7.2 Rectify faults
The operator of the system is responsible for taking suitable meas-
ures to rectify faults.
Maximum reliability is ensured. Nevertheless, faults can occur during
operation. These may be caused by the following, e.g.:
•
Measured value from sensor not correct
•
Voltage supply
•
Interference in the cables
The first measures to be taken are to check the input/output signals
as well as to evaluate the error messages via the display. The proce-
dure is described below. In many cases, the causes can be deter-
mined in this way and faults can be rectified.
The signal conditioning instrument and the connected sensors are
permanently monitored during operation and the values entered dur-
ing parameter adjustment are checked for plausibility. If irregularities
occur or in case of incorrect parameter adjustment, a fault signal is
triggered. In case of an instrument defect or line break/shortcircuit, a
fault signal is also triggered.
The fail safe relay deenergises in case of failure, the failure indication
lights and the current output jumps to 22 mA. In addition, one of the
following fault messages is outputted on the display.
Error code Cause Rectification
E003 CRC error (error with
self-check)
– Carry out a reset
– Send instrument for repair
E014 Sensor current
> 21 mA or short-
circuit
– Check sensor, e.g. on failure
– Remove short-circuit
E015 Sensor in boot phase
Sensor current
< 3.6 mA or line
break
– Check sensor, e.g. on failure
– Remove line break
– Check connection of the sensor
E016 Empty/full adjustment
reversed
– Carry out a fresh adjustment
E017 Adjustment span too
small
– Carry out a fresh adjustment and
increase the distance between min.
and max. adjustment
E021 Scaling span too
small
– Carry out a fresh scaling, increase
the distance between min. and max.
scaling.
Reaction when malfunc-
tions occur
Causes of malfunction
Fault rectification
Fault message