Flowserve 3400IQ Digital Positioner - Manual (Page 50)

Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
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Table 8.6 Transducer Block Parameter Descriptions
Parameter Default Value Function
FINAL_VALUE_CUTOFF_HI 110% This will saturate the actuator in an open position if
FINAL_VALUE becomes greater than the cutoff value.
FINAL_VALUE_CUTOFF_LO 1% This will saturate the actuator in a close position if
FINAL_VALUE becomes less than the cutoff value. This
is the same has the Minimum Position Cutoff feature of
the Logix 1200 digital positioner. The new terminology
matches FF terminology
FINAL_POSITION_VALUE Dynamic Actual stem position in percent of stroke
FINAL_VALUE_RANGE 110% to -10% The high and low range limit values, the engineering
units code and the number of digits to the right of the
decimal point to be used to display the final value.
DAC_PERCENT Dynamic DAC output in percent
CONTROL_FLAGS Used to tell positioner type of actuator and
characterization to use.
Note: Must match DIP switch settings.
GAIN_UPPER 2 Maximum proportional gain used.
GAIN_LOWER 1 Minimum proportional gain used.
GAIN_MULT 0,05 Adjust the rate of change between GAIN_UPPER and
GAIN_LOWER.
IGAIN 10 Integral gain.
IL_OFFSET 30-70% DAC value to hold spool in a null position
SOFTSTOP_HIGH 110% Software upper stroke limit
SOFTSTOP_LOW -10% Software lower stroke limit
PRESS_UNITS Psi Units pressure sensors reading are expressed in.
TEMP_UNITS Deg F Units temperature is expressed in.
Parameter Definitions
The following list summarizes some of the key parameters within the Logix 3400IQ digital positioner.
For definitions of parameters not listed, use the help window in the DD view. The Logix positioner
automatically stores changed parameters in non-volatile memory when a change is made
FINAL_VALUE This is the set-point or command received by the 3400IQ.
FINAL_VALUE_CUTOFF_HI If FINAL_VALUE is greater than FINAL_VALUE_CUTOFF_HI, the
positioner will saturate the actuator in an open position. A 1 percent hysteresis is added, so FINAL_
VALUE must be more than 1 percent smaller than FINAL_VALUE_CUTOFF_HI, before the positioner
will allow the valve to start closing. This feature is disabled in SOFTSTOP_HIGH is less than or equal
to 100 percent.
FINAL_VALUE_CUTOFF_LO If FINAL_VALUE is less than FINAL_VALUE_CUTOFF_LO the positioner
will saturate the actuator in a closed position. There is a 1 percent hysteresis added, so FINAL_VALUE
must be more than 1 percent of FINAL_VALUE_CUTOFF_LO, before the positioner will allow the valve
to start opening. This feature is disabled in SOFTSTOP_LOW is less than or equal to 0 percent.
FINAL_POSITION_VALUE This is the valve’s stem position, as sensed by the positioner. This value
is always reported in percent of stroke.
CONTROL_FLAGS Six options are provided under CONTROL_FLAGS. Each option has a signifi -
cant effect on how the positioner controls the valve. The CONTROL_FLAGS should be configured
correctly. These settings must match the settings of the DIP switches in the Logix 3400IQ to avoid
possible operational issues.