Evoqua WALLACE & TIERNAN SFC, Original Instruction Manual, Page: 154 / 288

154
WT.050.590.000.DE.IM.0719
Installation
SFC
5.
5.3.12 Positioner calibration with SFC (application 3) or
single feed forward (application 2)
In these applications the linearization of the control output is
possible, such as for example with a gas feeder which has
positioner feedback. Here, for example, 30 % control (opening)
does not equal 30 % dosing capacity. Calibration of the positioner
feedback allows up to eleven dosing capacity points to be aligned,
in order to obtain dosing that is as linear as possible.
For this purpose, the number of support points to be calibrated can
be selected in the menu „Control“ => „Actuator“ => „Ym
Calib.Points“. It is possible to calibrate 2, 3, 6 or 11 support points.
The more support points are selected, the more accurate is the
dosing.
• Starting from the basic display, select the „Control“ =>
„Actuator“ menu.
• In the „Ym Calib.Points“ menu, select the number of
calibration support points.
• Select the „Ym Calibration.Man“ menu and confirm with the
Enter key.
• The dosing outputs to be calibrated are shown on the display
(max. 11).
• The calibration points can be selected using the up/down
arrow keys. Press Enter to calibrate the support points, and
use the up/down arrow keys to open/close the positioner until
the actual dosing shown on the dosing capacity indicator (e.g.
gas feed inspection glass) agrees with the calibration point
(e.g. 20%). Save the value by pressing the Enter key.
• Select the next calibration point and align the actuator position
as described.
Please note
All calibration points must be aligned or checked in order to obtain
linear dosing output.
000% 0.0 (calibration point 0 % dosing)
020% 20.0 (calibration point 20 % dosing)
040% 40.0 (calibration point 40 % dosing)
060% 60.0 (calibration point 60 % dosing)
080% 80.0 (calibration point 80 % dosing)
100% 100.0 (calibration point 100 % dosing)