Flowserve 3400IQ Digital Positioner - Manual (Page 23)

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Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
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7.3 Description of Configuration DIP Switch Settings
The first six DIP switches are for basic configuration. The function of each switch is described below.
Air Action
This must be set to match the configuration of the valve/actuator mechanical tubing connection and
spring location since these determine the air action of the system.
ATO (air-to-open)
Selecting ATO if increasing output pressure from the positioner is tubed so it will cause the valve to
open.
ATC (air-to-close)
Selecting ATC if increasing output pressure from the positioner is tubed so it will cause the valve to
close.
Pos. Characterization
Linear Select Linear if the actuator position should be directly proportional to the input signal.
Other Select Other if another characteristic is desired, which is set in conjunction with the Control_
Flags parameter in the transducer block.
Optional Pos. Characterization
If the Pos. Characterization switch is set to Other then this parameter is active with the following
options:
=% The =% option will characterize the actuator response to the input signal based on a standard 30:1
equal percent rangeability curve.
QO Quick open is based on a standard industry quick-open curve.
Custom If Custom is selected, the positioner will be characterized to a custom table that must be
set-up using a properly configured 375 handheld or other host software. Custom characterization
can be thought of as a “soft CAM.” The user can define a characterization curve using 21 points. The
control will linearly interpolate between points. Points do not have to be equally spaced in order to
allow more definition at critical curve areas. The default values will linearize the output of a valve with
an inherent =% characteristic (e.g. ball valves.)