Flowserve Logix 520MD+ DD - Manual (Page 17)

DD User Manual - Logix® 520MD+ Series Digital Positioner FCD-LGENSF0013-01
© Flowserve Corporation
17
View the force required to move the valve down at 15%
position.
7.4.3.11 Force Up at 85 Percent
View the force required to move the valve up at 85% position.
7.4.3.12 Force Down at 85 Percent
View the force required to move the valve down at 85%
position.
7.4.3.13 Spring Rate
View the calculated spring rate which is the force change
over the full stroke. A negative value indicates the spring is
pushing the valve in the close direction.
7.4.3.14 Spring Pre Load
View the estimated force of the spring at the close position.
A negative value indicates the spring is pushing the valve in
the close direction.
7.4.3.15 Force Up
View the force required to move the valve up under the most
recent conditions.
7.4.3.16 Force Down
View the force required to move the valve down under the
most recent conditions.
7.4.4 Piezo Data
View piezo data. The piezo is a small valve in the positioner
that is controlled electronically and drives the pilot relay.
7.4.4.1 Piezo Command 1 Avg
View the average piezo command (1st aspect).
7.4.4.2 Piezo Command 2 Avg
View the average piezo command (2nd aspect).
7.4.4.3 Piezo Volts 1 Avg
View the average actual piezo voltage (1st aspect).
7.4.4.4 Piezo Volts 2 Avg
View the average actual piezo voltage (2nd aspect).
7.4.4.5 Piezo Volts
View current piezo voltage.
7.4.4.6 Piezo Volts High Percent Warning
Set the limit at which an Piezo Voltage High warning will
appear.
7.4.4.7 Piezo Volts Low Percent Warning
Set the limit at which a Piezo Voltage Low warning will
appear.
7.4.5 Actuation Ratio
View and set the Actuation Ratio alarm limits. The Actuation
Ratio is the force required to actuate the valve as a
percentage of the total force available. The value is an
estimate of the force that would be required to move the
valve to the end of travel, fully compressing the actuator
spring(s). It is affected by the process load, friction, spring
force, and available supply pressure. This feature requires
Pro diagnostics.
7.4.5.1 Actuation Ratio
View the current value of the Actuation Ratio.
7.4.5.2 Actuation Ratio Hi Start Limit
Set the limit at which an Actuation Ratio warning will appear.
7.4.5.3 Actuation Ratio Hi End Limit
Set the limit at which an Actuation Ratio warning will show
full severity.
7.4.5.4 Actuation Ration Percent Warning
View the severity of the Actuation Ratio warning based on
the Start and End limits.
7.4.6 Pilot Response
View and set the Pilot Response warning limits. The pilot
response is a measure of how rapidly the pilot relay is
following the pilot relay command. Longer times indicate
slower response. This feature requires Pro diagnostics.
7.4.6.1 Pilot Response Time
View the current value of the pilot response time. This is a
measure of how rapidly the pilot relay is following the pilot
relay command.
7.4.6.2 Pilot Response Hi Start Limit
Set the limit at which the Pilot Response warning will appear.
7.4.6.3 Pilot Response Hi End Limit
Set the limit at which the Pilot Response warning will show
full severity.
7.4.6.4 Pilot Response Percent Warning
View the severity of the Pilot Response warning based on the
Start and End limits.
7.4.7 Command/Position Frequencies
Set and view parameters associated with the command and
position frequency amplitude. This feature requires Pro
diagnostics.
7.4.7.1 Command Frequency
View the typical frequency of the command input cycling In
cycles/hour.
7.4.7.2 Command Frequency Hi Start Limit
Set the limit at which the Command Frequency warning will
appear.
7.4.7.3 Command Frequency Hi End Limit
Set the limit at which the Command Frequency warning will
show full severity.
7.4.7.4 Command Frequency Hi Percent Warning