Logix 3400Md Local Interface Operation; Initial Dip Switch Settings; Description Of Configuration Dip Switch Settings - Flowserve Logix 3400MD User Instructions

7.1 Logix 3400MD Local Interface
Operation
The Logix 3400MD local user interface (Figure 8) allows the user to
configure the basic operation of the positioner, tune the response, and
calibrate the positioner without additional tools or configurators. The
local interface consists of a RE-CAL button for automatic zero and span
setting, along with two jog buttons ( and ) for spanning valve/actua-
tors with no fixed internal stop in the open position. There is also a DIP
switch block containing eight switches. Six of the switches are for basic
configuration settings and two are for FF options. There is also a rotary
selector switch for adjusting the positioner gain settings. For indication
of the operational status or alarm conditions there are three LEDs on
the local user interface.
7.2

Initial DIP Switch Settings

Before placing the unit in service, set the DIP switches in the
Configuration boxes to the desired control options. A detailed descrip-
tion of each DIP switch setting follows.
NOTE: The Logix 3400MD positioner reads the DIP switch settings each
time the RE-CAL button is pressed. If a FF handheld or Host software is
used to configure and then calibrate the positioner, the DIP switches are
not read. The auto-tune adjustment switch labeled "GAIN" is always live
and can be adjusted at any time.
Transducer block settings will always override the DIP switch settings
until the RE-CAL button is pressed.
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 deter-
mine 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.
Logix 3400MD Digital Positioner FCD LGENIM3404-00 – 9/09
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 the CURVE_
SELECT 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 defini-
tion at critical curve areas. The default values will linearize the output of
a valve with an inherent =% characteristic (e.g. ball valves.)
Figure 9: Default Custom Characterization
100
90
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50
% Command
60 70 80 90 100
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