Smart Positioner
YT-3700 / 3750
Product Manual
Ver. 1.03
56
8.8.4
Forward D parameter (Kd UP) and reverse D parameter (Kd dN)
The Kd parameter is a differential value that adds the correction signal due to the rate of error to the
existing calibration signal. Kd UP is applied when the valve moves in the direction of increasing
output air pressure, and Kd dN is applied when the valve moves in the direction of decreasing
output air pressure. A larger D value makes the valve hunting easier, and a smaller value can lead to
poor linearity or dynamic properties.
3 seconds
Press <UP> or
<DOWN> button
if the above is not
displayed.
Press <UP> or
<DOWN> button
if the above is not
displayed.
<UP>/<DOWN>
<ESC>
3 times
8.8.5
Auto Dead band Mode (AUTO db)
This function is used to suppress a hunting for valves with high static friction. The initial value is OFF
and it shall be set to 0 % to activate the auto dead band automatically. The value is changed to a
proper value once this mode is activated.
3 seconds
Press <UP> or
<DOWN> button
if the above is not
displayed.
Press <UP> or
<DOWN> button
if the above is not
displayed.
<UP>/<DOWN>
<ESC>
3 times
