VVP10 HART
HART
®
VALVE POSITIONER
INSTALLATION, OPERATION, CONFIGURATION AND MAINTENANCE MANUAL
______________________________________________________________________________________________________________________________
45
OTHER PREDICTIVE DIAGNOSTICS
Input Pressure
Diagnostics for checking supply pressure limits. The user can
configure the lower limit (
Pressure Lower Limit)
and upper limit
(
Pressure Upper Limit)
for the positioner supply pressure, using
the configured unit (
Pressure Unit
– psi or bar).
An alarm (
Pressure Out of Range
) will be activated, and a counter
incremented when the supply pressure exceeds one of the
configured limits. When the pressure measurement is between
these limits the alarm will be automatically deactivated.
The user can configure the maximum value for the counter
(
Pressure Counter Limit
), in order to generate an alarm (
Pressure
Limit Alert
) when it is exceeded. This alarm is persistent,
requiring the user to manually deactivate it, after verifying the
cause of the pressure alert.
Figure 3.31 – Example of pressure alarms.
In the graph of Figure 3.31, the
Pressure Out of Range
alarm will be activated, and the counter will be incremented in
the P1 and P2 regions, considering the values of the limits in the black horizontal lines (disregarding oscillations in the
5 psi range). The alarm will be off at all other points on the graph between the configured limits.
The diagnostics also provides the user with the maximum and minimum input pressure values recorded during
positioner operation since the last reset. On restarting, counter, maximum/minimum registers and alarms are reset.
The default values for the Pressure parameters are
Pressure Lower Limit = 0 psi, Pressure Upper Limit = 100 psi
and
Pressure Counter Limit = 0
(see note).
Temperature (Temperature)
Diagnostics for checking temperature limits. The user can configure the lower limit (
Temperature Lower Limit
) and
upper limit (
Temperature Upper Limit
) for the temperature measured by the positioner, using the configured unit
(
Temperature Unit
– °C or °F).
An alarm (
Temperature Out of Range
) will be activated, and a counter incremented when the temperature exceeds
one of the configured limits. When the temperature measurement is between these limits the alarm will be automatically
deactivated.
The user can configure the maximum value for the counter (
Temperature Counter Limit
), in order to generate an alarm
(
Temperature Limit Alert
) when it is exceeded. This alarm is persistent, requiring the user to manually deactivate it,
after verifying the cause of the temperature alert.
WARNING
This diagnostic will only be available for models that have pressure sensors installed. Check the Product
Order Code for this feature (section 6.2).
NOTE
Depending on the pressure working range, the user can configure the counter limit to zero, in order to be
warned persistently if the pressure goes beyond the limits at some point.
NOTE
Depending on the working temperature range, the user can set the counter limit to zero, in order to be
persistently alerted if the temperature exceeds the limits at any time.
