Flowserve 3400IQ Digital Positioner - Manual (Page 51)


Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
flowserve.com
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
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.
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.
ActuatorStyle: Check this box only if the positioner is mounted on a rotary type actuator.
Custom Characterization Active: Check this box the FINAL_VALUE parameter is to be character-
ized. If the Quick Opening or Equal Percent box is also checked the positioner will use a factory
defined curve. If only Custom Characterization Active is checked, a user-defined curve will be
used. Note that when this box is checked the curve can not be changed. If the user wishes to use a
different curve, or edit the custom curve, this box must be unchecked.
Air Action: Check this box only if the actuator is tubed to be Air-to-Close (ATC). After configuring
CONTROL_FLAGS, click the write button to apply the values.
GAIN_UPPER The Logix 3400IQ digital positioner uses a special gain algorithm. The proportional
gain increases with a decrease in error. This allows for maximum resolution and speed. GAIN_UPPER
is the upper limit to proportional gain.
GAIN_LOWER The Logix 3400IQ digital positioner uses a special gain algorithm. The proportional
gain increases with a decrease in error. This allows for maximum resolution and speed. GAIN_
LOWER is the lower limit to proportional gain.
GAIN_MULT The Logix 3400IQ digital positioner uses a special gain algorithm. The proportional
gain increases with a decrease in error. This allows for maximum resolution and speed. GAIN_MULT
adjust the transition rate between GAIN_UPPER and GAIN_LOWER.
IGAIN In addition to proportional gain the Logix uses integral as well. This in the integral gain
setting. Typically this is set to 10.
IL_OFFSET This parameter tells the positioner where the spool valves null position is.
These values are set during a stroke calibration procedure and typically require no further adjust-
ments, if Auto Tune is enabled on the user interface.
CMD_USED This is the set point or command to which the positioner is controlling. After FINAL_
VALUE is acted on by Characterization, Softstops, and FINAL_VALUE_CUTOFF, CMD_USED reports
the modified or used command value.
CALIBRATE This parameter initiates calibration. Three types of calibration are available Stroke,
Pressure Sensors (advanced models only). To learn more about calibration refer to the Calibration
section of this document.
PRESS_CAL Before doing a pressure sensor calibration, enter the supply pressure being used in
units expressed by PRESS_UNITS.
SOFTSTOP_HIGH Software imposed stroke limit. The positioner will not allow the valve to open
beyond the value shown in this parameter.
SOFTSTOP_LOW Software imposed stroke limit. The positioner will not allow the valve to close
beyond the value shown in this parameter, normally psi.
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