Yokogawa YVP20S - Manual (Page 75)

8-6
<Toc> <Ind> <8. SETUP WIZARD>
IM 21B04C50-01E
8.5 Position Control limits Wizard
Click next to move to the Position Control Limits Wizard. If it is decided to limit the travel, set
the appropriate values here. These values will alter the valve performance. Use them with
caution.
The values shown in Figure 8.8 are the initial values to use if there are no special
requirements. The parameters are defined below.
Figure 8.8 Position Control Limits Wizard
● Position Limit
Tight Shutoff Below
If the valve position setpoint is less than this value, the valve is forced to fully close. A value
of -10 removes this function from the normal travel range. Set this between 1 and 3 to
minimize seat leakage. There is a dead band.
NOTE
When Tight Shutoff below is configured to a positive value, small flows will not be
controllable.
Full Open Above
If the valve position setpoint is more than this value, the valve is forced to fully open. A
value of 110 removes this function from the normal travel range.
Position Lower Limit
The valve position setpoint may not be less than this value. This will prevent the valve from
closing. Use only when required by the control strategy. A value of -10 removes this
function from the normal travel range.