Transducer Block
December 2009
4-27
PlantWeb Alerts
Some instrument alert conditions can also be used to
trigger PlantWeb alerts that will be reported in Failed,
Maintenance or Advisory categories, as configured by
the user. PlantWeb alerts, when enabled, can
participate in the DeltaV alarm interface tools such as
the alarm banner, alarm list and alarm summary.
When a PlantWeb alert occurs, the DVC6000f sends
an event notification and waits a specified period of
time for an acknowledgment to be received. This
occurs even if the condition that caused the alert no
longer exists. If the acknowledgment is not received
within the pre-specified time-out period, the event
notification is retransmitted. This reduces the
possibility of alert messages getting lost.
PlantWeb alerts are mode-based. Refer to table C-1
for details.
Note
Additional details on setting up and
using PlantWeb Alerts can be found in
Appendix C of this manual.
Electronics Alerts
(TB > Configure/Setup > Detailed Setup > Alerts >
Elect Alerts)
Drive Current
Drive Current
Drive Current (DRIVE_CURRENT [54]) displays the
measured Drive Current actually flowing through the
I/P converter in percent of maximum drive.
Drive Current Alert
This alert is active when the difference between the
expected Drive Current and the actual Drive Current
has exceeded the Drive Current Alert Time.
Drive Current Alert Enable
When enabled Drive Current Alert Enable activates
the Drive Current Alert.
Drive Current Shutdown
The Shutdown Trigger (SHUTDOWN_TRIGGER
[76.1]) permits enabling or disabling Self Test
Shutdown for the Drive Current alert. When enabled,
and the alert condition is present, the transducer
Actual mode is placed Out of Service. The instrument
will attempt to drive the valve to the Zero Power
Condition and will no longer execute transducer
control function.
Drive Current Manual Recovery
Shutdown Recovery (SHUTDOWN_RECOVERY
[76.2]) permits enabling or disabling Automatic
recovery from Self Test Shutdown. When enabled, the
transducer block will return to Target mode when Drive
Current Shutdown clears. If not enabled, the
transducer block will remain Out of Service until power
is removed and restored or the user changes the
transducer block target mode to Manual or Auto. In
any case, the target mode will remain Out of Service,
if the condition that caused the shutdown remains or
until the shutdown trigger is disabled.
Drive Current Alert Point
The Drive Current Alert Point
(DRIVE_CURRENT_ALRT_PT [76.4]) is when the
absolute difference between the Drive Current and
Drive Signal exceeds the set threshold for greater than
the Drive Current Alert Time.
Drive Current Alert Time
The Drive Current Alert Time
(DRIVE_CURRENT_TIME [76.5]) is the maximum
time that the Drive Current Alert Point can be
exceeded before the Drive Current Alert is active.
Drive Signal
Drive Signal
The Drive Signal (DRIVE_SIGNAL [53]) displays the
commanded Drive Signal being sent to the I/P
converter as a percentage of the maximum drive.
4
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