Flowserve 3400IQ User Manual

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Logix 3400IQ Digital Positioner FCD LGENIM3403-00 – 11/07

A. MODE_BLK: TARGET must have OOS selected to edit parameters in the FVPTB

Figure 10: FVPTB Parameter Window

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 NI Configurator. The Logix 3400IQ digital
positioner automatically stores changed parameters in non-volatile memory whenever the change is made.

FINAL_VALUE: This is the set point or command received by the Logix 3400IQ digital positioner.

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 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. A 1 percent hysteresis is 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: Eight options exist under CONTROL_FLAGS. Each option has a significant effect on
how the positioner controls the valve. Make sure that the CONTROL_FLAGS is configured correctly.

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Quick Opening Curve: The Logix 3400IQ digital positioner comes with a default quick opening curve. If

this response is desired, check the Quick Opening Curve and Custom Characterization Active boxes

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Equal Percent Curve: The Logix 3400IQ digital positioner comes with a default equal percent curve. If this

response is desired, check the Equal Percent Curve and Custom Characterization Active boxes.

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Positioner Model: This parameter is automatically set at power-up. It tells the positioner if it is an

advanced (pressure sensors) model or standard (no pressure sensors). If the user wishes to over-ride the
Auto Model Detect feature, consult the factory.