WIKA DPT-10 - Manual (Page 69)

9 Maintenance and fault rectification
9 .1 Maintain
When the instrument is used properly, no special maintenance is
required in normal operation.
In some applications, product buildup on the separating diaphragms
can influence the measuring result. Depending on the sensor and
application, take precautions to ensure that heavy buildup, and
especially a hardening thereof, is avoided.
9 .2 Rectify malfunctions
The operator of the system is responsible for taking suitable measures
to rectify malfunctions.
DPT 10 offers maximum reliability. Nevertheless, faults can occur
during operation. These may be caused by the following, e.g.:
l Sensor
l Process
l Voltage supply
l Signal processing
The first measures to be taken are to check the output signals as well
as to evaluate the error messages via the indicating and adjustment
module. The procedure is described below. Further comprehensive
diagnostics can be carried out on a PC with the software PACTware
and the suitable DTM. In many cases, the causes can be determined
this way and faults rectified.
? When an additional instrument is connected, the segment fails.
l Max. supply current of the segment coupler exceeded
à Measure the current consumption, reduce size of segment
? Wrong presentation of the measured value in Simatic S5
l Simatic S5 cannot interpret the number format IEEE of the
measured value
à Insert converting component from Siemens
? In Simatic S7 the measured value is always presented as 0
l Only four bytes are consistently loaded in the PLC
à Use function component SFC 14 to load 5 bytes consistently
Maintenance
Reaction when malfunc-
tions occur
Causes of malfunction
Fault rectification
Checking Profibus PA
Differential pressure transmitter DPT10 - metal measuring diaphragm • Profibus PA 69
9 Maintenance and fault rectification
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EN
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