Flowserve Logix 420 User Instructions page 17

8.4.1 Quick Calibration Switch – Jog
Set the Quick Calibration Switch to Jog if the valve/actuator assembly
has no internal mechanical stop at the fully open position. In this case,
follow these instructions:
1. Press and hold the ► ACCEPT/QUICK-CAL button for
approximately 3 seconds.
This will initiate the jog stroke calibration. The positioner will then close
the valve and set the zero position. The zero position is automatically
always set at the valve seat. At this point the LED's will flash in a
sequence of G-R-R-R (green-red- red-red) which indicates that the user
must use the jog keys to manually position the valve to approximately
100%.
2. Use the up and down keys to position the valve at approximately
100% open.
3. Press the ► ACCEPT/QUICK-CAL button to proceed.
No more user actions are required while the calibration process is
completed. When the lights return to a sequence that starts with a green
light the calibration is complete. The jog calibration process will only
allow the user to set the span. If an elevated zero is needed a handheld
or ValveSight DTM are required.
8.4.2 Tuning Options
Quick-Cal Custom Gains – This is typically the fastest way to achieve
ideal gains. Set the Auto Tune Configuration Switch to On and the
Selectable GAIN Switch to "E". Then perform a Quick-Cal. During the
Quick-Cal, custom tuning parameters will be determined based on
measured response parameters. The gains can then be fine-tuned by
adjusting the Selectable GAIN Switch. Selecting "D" "C" or "B" will
progressively provide a more stable response. Selecting "F" through
"J" will progressively provide a more active response. In most cases
selecting "E" will give the best results. This is the default setting for all
actuator sizes. Raising or lowering the Selectable GAIN Switch setting is
a function of the positioner/valve response to the control signal, and is
not actuator size dependent.
Standard Preset Gains – If standard, preset gains are desired, set the
Auto Tune Configuration Switch to Off. After performing a Quick-Cal,
use the Selectable GAIN switch to the desired level ("B" – "J"). The
standard, preset gain settings are not affected by Quick-Cal.
It may be necessary to set the gain switch before the Quick Cal. Very
fast stroking valves may need to be at lower gains and very slow
stroking valves may need to be at higher gains. It may be necessary to
set the gain switch BEFORE the Quick Cal. Very fast stroking valves may
need to be at lower gains and very slow stroking valves may need to be
at higher gains.
Logix 420 Digital Positioner FCD LGENIM0106-07-AQ – 10/15
®
Custom Manual Gains – To set gains manually, set the selectable GAIN
switch to "A". Changing the switch from "B" to "A" will write the stan-
dard "B" settings into the "A" parameters, allowing a starting point for
modification. Similarly, changing the switch from "J" to "A" will write
the standard "J" settings into the "A" parameters. Custom tuning values
can then be entered using the Display Menu, a Handheld or ValveSight
DTM. With the Selectable GAIN Switch set to "A", the tuning will not be
modified during a Quick-Cal.
8.4.3 Aborting a Quick-Cal
The Quick-Cal can be aborted at any time by briefly pressing the
► ACCEPT/QUICK-CAL button again. In this case, the previous settings
will be retained.
8.4.4 On Line Stroke Calibration Adjustments
At times an adjustment to the calibration is desired, but the process
cannot be interrupted. The stroke calibration can be adjusted with
minimal valve movement. Contact your local Field Service Technician
for more information.
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