5
Measured value status and valve diagnostics
5.1
Extended valve diagnostics – EXPERTplus
The Type 3730-4 Positioner includes integrated diagnostic functions. According to the
Profibus Profile 3.01 and the 'Condensed status and diagnostic messages' extension, the
generated alarms can be classified and summarized (see section 5.5, page 29).
The EXPERTplus extended diagnostics provides the following in-service monitoring and
out-of-service tests to provide significant statements on the condition of the entire control
valve.
Statistical information (in-service monitoring)
4
Data logger
4
Histograms
4
Cycle counter
4
Valve end position trend
4
Drive signal diagram
4
Hysteresis test
Tests (out-of-service tests)
4
Drive signal diagram over the full range of the valve
4
Hysteresis test diagram over the full range of the valve
4
Static characteristic
4
Partial stroke test
The diagnostic tests are completely integrated into the positioner. The PROFIBUS-PA protocol
allows parameters to be entered and test results to be read. The graph readings depend on
the process control system used.
Further status alarms are generated from the extensive information compiled during the diag-
nostic tests of EXPERTplus which provide the user with information covering the entire control
valve.
The required reference graphs are automatically plotted after initialization and saved in the
positioner if the plotting is activated with Code 48 - h0 in EXPERTplus.
KH 8384-4 EN
17
Measured value status and valve diagnostics
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