Operating instructions

EB 8384-6 EN 11
Design and principle of operation
Diagnostic function
Control
valve
On/off
valve Diagnosis
Monitoring
Data logger • • Depending on trigger condition selected
Valve signature •
Ä
–
Friction
–
Supply pressure
–
Actuator springs
–
Pneumatic leakage
On/off valve – •
–
Breakaway time
–
Transit time
–
Final travel/angle value
Valve position histo
-
gram
•
Ä
–
Course of the manipulated variable range
– Manipulated variable range
Set point deviation
histogram
• • – Manipulated variable range limitation
– Seat leakage
– Positioner-valve linkage
– Max. set point deviation
Cycle counter histo-
gram
• • – Packing leakage
– Dynamic load factor
Leakage sensor • • – Seat leakage
Course of end posi
-
tion
••
–
Course of end position
–
Zero point shift
Dynamic tests
Valve dead band • •
–
Dead band
Partial stroke test
(PST)
••
–
Overshooting
–
Dead time
–
T86
–
Settling time
Full stroke test (FST) • •
–
Overshooting
–
Dead time
–
T86
–
Settling time
• Full scope of functions
Ä
Function is performed, but not analyzed
– Function is not performed
Table 1 · Diagnostic functions and diagnosis,
(refer to the Operating Instructions EB 8389-1 EN on EXPERTplus Valve Diagnostics for more details)