DVC6000f Digital Valve Controllers
December 2009
C-10
Table C-3. Using PlantWeb Alerts (Continued)
PlantWeb Alert
(Group)
(Default Alert Category
Alert Condition
and (Default)
What the Alert is
Detecting
Effect on Valve / Instrument
Recommended
Action
Help
Pressure Fallback
(Sensors)
(Maintenance)
Pressure Fallback
(Enabled)
A travel sensor failure or large
travel deviation has resulted in
fallback to pressure control.
None − Indicates a reduced
performance condition.
Check
instrument
feedback linkage
and travel
sensor.
The instrument has
detected that the travel
sensor is outside its
normal range of
operation or that a
gross deviation exists
between set point and
actual travel. It has
switched to Pressure
Control and is no
longer using the travel
sensor to position the
valve.
Supply Pressure
(Environment)
(Maintenance)
Supply Press
High (Enabled)
The supply pressure has
exceeded the Supply
Pressure Hi Alert Point.
None − Indicates a condition
that could cause damage to
the instrument or actuator.
Confirm proper
air supply.
The Supply Pressure
sensor on-board has
detected an
abnormally high supply
pressure. Verify the
proper supply
pressure and that the
alert is properly set.
Supply Press Low
(Enabled)
The supply pressure is lower
than the Supply Pressure Lo
Alert Point.
None − Indicates a condition
that could reduce
performance or prevent the
valve from shutting tightly.
The Supply Pressure
sensor on-board has
detected an
abnormally low supply
pressure. Verify the
proper supply
pressure and that the
alert is properly set.
Temperature Limit
(Environment)
(Advisory)
Temperature High
(Enabled)
The temperature is greater
than the Temperature Hi Alert
Point.
None − Indicates a condition
that could shorten service life
or lead to reduced
performance.
Check
instrument
environment.
The instrument
temperature has
exceeded the user
configured high
temperature limit.
Operation of the
instrument above the
rated temperature may
degrade instrument
components. This may
affect instrument
performance and/or
reduce the life of the
instrument.
Temperature Low
(Enabled)
The temperature is lower than
the Temperature Lo Alert
Point.
The instrument
temperature has
dropped below the
user configured low
temperature limit.
Operation of the
instrument below the
rated temperature may
degrade instrument
components. This may
affect instrument
performance and/or
reduce the life of the
instrument.
−Continued−
C
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