Flowserve 400MD Logix - Manual (Page 37)

Figure 8.2 Transducer Block Diagram
Transducer Block Valtek Product-defined Parameters
Table 8.6 describes the Logix parameters included in the transducer block.
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 as the Minimum Position Cutoff feature of the Logix1200 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.
TEST_MODE 0 Used to enable certain parameter outputs and diagnostic control.
CONTROL_CONFIG 0 Used to configure the positioner.
PGAIN 2 Proportional gain.
DGAIN 2 Derivative gain.
IGAIN 10 Integral gain.
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 DegF Units temperature is expressed in.
Parameter Definitions
The following list summarizes some of the key parameters within the Logix 3400MD 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 3400MD.
FINAL_VALUE_CUTOFF_HI : If FINAL_VALUE is greater than FINAL_VALUE_CUTOFF_HI, the positioner will saturate the actuator in an open posi-
tion. 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.
Controller Board
Logix 3400MD Digital Positioner LGENIM3405-02 11/13
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