47
––––
Fb–SPN
Fb–OFS
no
Fb–rSt
––––
4
CONFIGURATION…
4.14
Scale Adjustment Page
The next three parameters are only included if the position feedback facility is selected.
Position Feedback Scale Adjustment Reset
Set to
YES
and press
to reset the position feedback
offset and span adjustments to their nominal value.
dONE
is displayed to indicate that these parameters have been
reset.
Position Feedback Offset Adjustment
Proceed as for
Process Variable Offset Adjustment
frame
and apply the correct input for the spot calibration
required. Ratio and bias settings are ignored.
Set the value required. The decimal point position is set
automatically. For resistance inputs use the external
connections to drive the valve to the fully closed position.
Adjust
or
to bring the value displayed to that set in
Position Feedback Range Zero
frame in the
Set Up Position
Feedback Page
. If this value cannot be reached, adjust the
value in
Position Feedback Range Zero
frame to bring it
within the offset bandwidth of
±
10%.
Position Feedback Span Adjustment
Proceed as for
Process Variable Span Adjustment
frame
and apply the correct input for the spot calibration
required. Ratio and bias settings are ignored.
Set the value required. The decimal point position is set
automatically. For resistance inputs use the external
connections to drive the valve to the fully open position.
Adjust
or
to bring the value displayed to that set in
Position Feedback Range Full Scale
frame in the
Set Up
Position Feedback Page
. If this value cannot be reached,
adjust the value in
Position Feedback Range Full Scale
frame to bring it within the span bandwidth of
±
10%.
Return to the top of the
Scale Adjustment Page
.
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