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8
OPERATION – DIP SWITCH
CONFIGURATION
The Logix 3800zb local user interface allows the user to
calibrate, configure the basic operation, and tune the response
of the positioner without additional tools or configurators.
Before placing the unit in service set the DIP Switches to the
desired control options. The DIP Switch settings do not take
effect immediately, but are activated only by performing a
Stroke calibration (pressing the "QUICK-CAL" button for 3
seconds). However, the DIP switch settings may be edited
from the DTM or Handheld at any time. See Figure 22: Local
User Interface.
Figure 22: Local User Interface
8.1
Air Action Switch (ATO◄►ATC)
The air action switch must be set to match the configuration of
the valve/actuator mechanical tubing connection. The tubing
determines the air action of the system.
ATO – Increasing pressure from Port A causes the valve to
open.
ATC – Increasing pressure from Port A causes the valve to
close.
8.2
Actuator Switch
(DOUBLE◄►SINGLE)
The actuator switch must be set to match the configuration of
the actuator. The diagnostics and control depend on the
accurate selection of this switch. .
Double – When there is pressure on both sides of the actuator
Select Double.
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Logix™ 3800zb Digital Positioner FCD AIIOM001030_EN 02/23
Single – When there is pressure on only one side of the
actuator select Single.
8.3
Characterization Switch
(LINEAR◄►OTHER)
The Characterization Switch allows a better match between
the input command and the actual fluid flow through the valve.
The positioner makes a correction by applying an adjustment
to the input command according to a characterization curve.
Usually, valves that have non-linear flow characteristics
require a characterization curve to be specified.
Linear – Select Linear if the actuator position should be directly
proportional to the command input signal. (For most rotary
valves, this setting gives an =% Cv characteristic due to their
inherent =% characteristics.)
Other – To select one of the pre-set characterization curves or
Selectable
a custom curve choose Other. The default is the Linear
Gain
Characterization. Other custom curves such as a standard
Switch
30:1 equal percent range ability curves are available in the
diagnostic tools. To select one of the other curve options, use
QUICK CAL
the LCD menu, a Handheld or the ValveSight DTM. To modify
Calibration
Button
the Custom curve, use the DTM.
LED
8.4
Auto-Tune Switch
Indicators
(TUNE_ON◄►TUNE_OFF)
(5x)
Configuration
This switch controls whether the positioner will automatically
DIP Switches
tune itself during the stroke calibration (Quick-Cal), or use
(8x)
preset tuning parameters. On is recommended in most cases.
On – Selecting On enables an auto tune feature that will
automatically
Response parameters measured during the latest Quick-Cal
determine the automatic tuning. The valve response is a
combination of these response parameters and the current
position of the Selectable GAIN Switch.
Off – Selecting Off forces the positioner to use one of the
factory preset tuning sets determined by the Selectable GAIN
Switch. Settings "B" through "J" are progressively higher
predefined tuning sets.
Selecting "A" on the Selectable Gain Switch during a Quick-
Cal allows the user to use and preserve manually adjusted
gains. The calibration only sets the position limits in this case.
See section 9, Operation – Calibration And Control9, for more
details.
NOTE:
the Auto-Tune selection, the gain settings can be adjusted at
any time during operation by changing the selectable Gain
switch position. See Figure 23: Selectable Gain Switch.
22
determine
the
positioner
The gain switch is LIVE meaning that regardless of
gain
settings.
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