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Auto Tune
This switch controls whether the positioner will auto tune itself or
use preset tuning parameters.
On On enables an auto tune feature that will automatically
determine the positioner gain settings based on the current
position of the selectable "Gain" switch setting and response
parameters measured during the last Quick-Cal. The gain switch
is live meaning the settings can be adjusted at any time by
changing the selectable gain switch position. (Note that there is
a small black arrow indicating the selection. The slot is NOT in
the indicator.)
Figure 10: Adjustable GAIN Switch
If the selectable GAIN switch is set to "D", "C", or "B", with the
auto tune switch on, progressively lower gain settings will be
used based on response parameters measured during the last
QUICK-CAL.
If the adjustable GAIN selector switch is set to "F", "G", or "H"
with the auto tune switch on, progressively higher gain settings
will be calculated and used based on response parameters
measured during the last QUICK-CAL.
If the selectable GAIN switch is set to "A" the tuning will not be
modified with a QUICK-CAL. Use this setting if custom tuning
will be done using a handheld or other Flowserve software.
Off Off forces the positioner to use one of the factory
preset tuning sets determined by the rotary "Gain" selector
switch. Settings "A" through "H" are progressively higher
gain predefined tuning sets. The Gain selector switch can be
adjusted at any time to modify the tuning parameters.
NOTE: With Autotune on "E" is the default adjustable GAIN
selector switch setting for all actuator sizes. Raising or lowering
the gain setting is a function of the positioner/valve response to
the control signal, and is not actuator size dependent.
Spare Switch
If special features have been purchased they may be controlled
by this switch. See special documentation for more details.
Stability Switch
This switch adjusts the position control algorithm of the positioner
for use with low-friction control valves or high-friction automated
valves.
Placing the switch to the left optimizes the response for low
friction, high performance control valves. This setting provides
16
User instructions - Digital Positioner 3200MD LGENIM0059-01 10/08
®
GAIN
A
H
B
G
C
F
D
E
for optimum response times when used with most low friction
control valves.
Placing the switch to the right optimizes the response for
valves and actuators with high friction levels. This setting
slightly slows the response and will normally stop limit
cycling that can occur on high friction valves.
NOTE: This option is more effective on advanced units with the
optional pressure sensors installed.
7.4
Setup of the Cal Dip-Switch for the
Quick Calibration operating mode.
The eighth DIP switch selects between two calibration options. The
function of the Cal DIP switch is described below.
Auto Select Auto if the valve/actuator assembly has an internal
stop in the open position. In Auto mode the positioner will fully
close the valve and register the 0% position and then open the
valve to the stop to register the 100% position when performing
a self-calibration. See detailed instructions in the next section on
how to perform an auto positioner calibration.
Jog Select Jog if the valve/actuator assembly has no calibra-
tion stop in the open position. In the Jog mode the positioner
will fully close the valve for the 0% position and then wait for the
user to set the open position using the Jog buttons labeled with
the up and down arrows. See the detailed instructions in the
next section on how to perform a manual calibration using the
"Jog" buttons.
c
WARNING: During the QUICK-CAL operation the valve
may stroke unexpectedly. Notify proper personnel that
the valve will stroke, and make sure the valve is properly
isolated.
7.5
QUICK-CAL Operation
The QUICK-CAL button is used to locally initiate a calibration of the
positioner. Pressing and holding the QUICK-CAL button for ap-
proximately 3 seconds will initiate the calibration. A QUICK-CAL can
be aborted at any time by briefly pressing the QUICK-CAL button and
the previous settings will be retained.
If the Quick calibration switch (be careful not to confuse with the
QUICK-CAL button) is set to Auto and the valve/actuator assem-
bly has the necessary internal stops the calibration will complete
automatically. While the calibration is in progress you will notice a
series of different lights flashing indicating the calibration progress.
When the lights return to a sequence that starts with a green light
the calibration is complete. (see the table X for an explanation of the
various light sequences) The initial calibration of extremely large
or very small actuators may require several calibration attempts.
The positioner adapts to the actuator performance and begins each
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