Metso NELES NDX 511 Series, Инструкция по установке, обслуживанию и эксплуатации

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56
NDX VALVE CONTROLLER
Control Performance Diagnostics
Status Related events in the event log Status description Proposed actions Default NAMUR
classification
Travel Ratio Limit
Exceeded
Travel Ratio Limit Exceeded
Travel Ratio back to normal
Valve travel/valve
reversals
Check if process conditions have changed.
Evaluate if limit is correctly set.
Info
Steady State Deviation
Limit Exceeded
Steady State Deviation Limit
Exceeded
Steady State Deviation Back
to Normal
Increased friction
in valve or actuator,
leakage in pneumat­
ics or insufficient
supply pressure.
Inspect steady state deviation trend to
determine if there have been any recent
significant increases. Evaluate if limits and
latch time are correctly set. Check previous
alarms for prior conditions. Check actuator
for pneumatics leakage and that valve is
able to move in whole operating range.
Run calibration if needed (calibration will
help to compensate changed operating
conditions) and check performance. Check
valve at next maintenance opportunity
Out of
Specification
Steady State Deviation
Last Day Trend Limit
Exceeded
Steady state deviation trend
limit exceeded
Steady state deviation trend
limit recovered
Increased friction
in valve or actuator,
leakage in pneumat­
ics or insufficient
supply pressure.
Inspect steady state deviation trend to
determine if there have been any recent
significant increases. Evaluate if trend
limits are correctly set. Check previous
alarms for prior conditions. Check actuator
for pneumatics leakage and that the valve
is able to move in whole operating range.
Run calibration if needed (calibration will
help to compensate changed operating
conditions) and check performance. Check
valve at next maintenance opportunity.
Disabled
Hunting Detected Hunting detected
Hunting recovery
Improper selection
of position control
performance level.
If there are boosters,
the hunting may be
caused by those.
Check position control performance level,
possibly change to less aggressive to stabi­
lize valve. Try to open booster bypass valve.
The correct way to tune the boosters is
commonly to adjust those so that boosters
are not active if you make step change less
than 5 percent and if step size is larger than
5 percent boosters will be active. Check
valve at next maintenance opportunity.
Info
Operation State Diagnostics
Status Related events in the event log Status description Proposed actions Default NAMUR
classification
Device in Manual
Mode
Device set in manual mode
Device set in auto mode
Device is locally (LUI)
set to manual mode.
Device is not follow­
ing mA setpoint.
If mA setpoint shall be followed set device
in auto mode with LUI.
Function
Check
Multipoint Step Test
Running
Multipoint Step test started
Multipoint Step test completed
Multipoint Step Test failed
Multipoint Step Test cancelled
Device functional test
is running.
Check the test result from DTM/EDD Event
Log.
Function
Check
Valve Signature Test
Running
Valve signature test started
Valve signature test completed
Valve signature Test failed
Valve signature Test cancelled
Device functional test
is running.
Check the test result from DTM/EDD Event
Log.
Function
Check
Valve Dead Band Test
Running
Valve signature test started
Valve signature test completed
Valve signature Test failed
Valve signature Test cancelled
Device functional test
is running.
Check the test result from DTM/EDD Event
Log.
Function
Check
13 DEVICE TYPE MANAGER (DTM)