Flowserve 420 IOM - Manual (Page 17)

User Instructions - Logix® 420 Series Digital Positioners FCD LGENIM0106-06 12/13
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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.
Custom Manual Gains - To set gains manually, set the
selectable GAIN
switch to “A”. Changing the switch from “B”
to “A” will write the standard “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.