Fisher FIELDVUEDVC6200f Instruction Manual page 195

Instruction Manual
D103412X012
Table C‐3. Using Field Diagnostic Alerts (continued)
Field Diagnostic Alert
Alert Condition
(Group)
(Default Alert Category)
(2)
FST Abnormal FST Abnormal
(Maintenance) (Enabled)
Diagnostic In Progress Diagnostic in
(Check) Progress
(Enabled)
(2)
Test Overdue PST Overdue
(Disabled)
FST Overdue
(Disabled)
Stroke History Stroke Open time
exceeded
(Disabled)
Stroke close time
exceeded
(Disabled)
(2)
PST Pending Automatic PST
Pending
(Enabled)
1. Performance Alerts are only available with a PD or a PST instrument.
2. FST/PST Alerts are only available with a PST instrument.
Table C‐4. Output Block PV Status
FEATURE_SEL
Field Diagnostic Alerts Set PV Status
Enabled
Not Enabled
NOTES:
=
X No Effect
1. PV limit substatus reflects only READBACK limit substatus. SP limit substatus reflects only out block rate limits.
What the Alert is Detecting
(Default)
If the valve reached the
opposite end, returned to the
normal end. The user can add
to this list of evaluation criteria.
A diagnostic is in progress (PST,
FST, Total Scan, Step
Response)
Time since the last good PST is
more than the configured PST
overdue threshold.
Time since the last good FST is
more than the configured FST
overdue threshold.
The measured open stroke
time is more than the
configured stroke open time
threshold.
The measured close stroke
time is more than the
configured stroke close time
threshold.
An automatic PST is due sooner
than the configured PST
Pending alert time
Transducer Mode,
Actual
OOS
Man
Auto
Auto
Auto
Auto
OOS
Man
Auto
Auto
Auto
Auto
Effect on Valve/Instrument
Valve may not go to the
demand position when
commanded.
None
SIL numbers for the shutdown
valve may be affected.
SIL numbers for the shutdown
valve may be affected.
Valve stroke times will not be
met.
Valve stroke times will not be
met.
Periodic PST may be required
to maintain the target SIL level
for the valve assembly.
Active Field AO / DO
Diagnostic Alarms PV Status
X Bad
X Bad
Fail Uncertain
Maint, no Fail Uncertain
Advisory, no Fail, no Maint Good
None Good
X Bad
X Bad
Fail Good
Maint, no Fail Good
Advisory, no Fail, no Maint Good
None Good
DVC6200f Digital Valve Controller
Field Diagnostic Alerts
Recommended
Action
Identify the cause If the test was not
and address the cancelled then initiate
problem. another FST and check
if the valve moves
smoothly to its FST
target position and
returns to its normal
seat within the
configurable FST
completion time. Verify
that the supply
pressure low alert was
not active during the
test.
None Informational, no
action required.
Run a successful The actual duration
PST at the earliest since a successful
possible process stroke test has
window. exceeded a
configurable limit. Run
Run a successful
a stroke test at the
full stroke test at
earliest possible
the earliest
process window.
possible process
window.
Run a full stroke Stroke time is outside
test / total scan to the configured limit.
identify the Check operation of the
problem. valve and instrument.
Possible items include:
sticking valve, low
Run a full stroke
supply pressure,
test / total scan to
instrument pneumatic
identify the
components, actuator,
problem.
instrument tubing etc.
Run a PST per
schedule.
AO / DO PV AO/DO PV
Substatus Limit Substatus
Constant
Device Failure
Constant
Non‐specific
See table C‐5
Subnormal
See table C‐5
Non‐specific
See table C‐5
Advisory
Non‐Specific See table C‐5
Constant
Device Failure
Constant
Non‐Specific
Non‐Specific See table C‐5
See table C‐5
Non‐Specific
See table C‐5
Non‐Specific
Non‐Specific See table C‐5
February 2017
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