Yokogawa YVP20S - Manual (Page 76)

8-7
IM 21B04C50-01E
<Toc> <Ind> <8. SETUP WIZARD>
Position Upper Limit
The valve position setpoint may not exceed this value. This will prevent the valve from
closing. A value of 110 removes this function from the normal travel range.
“Near Closed” Value
The threshold below which the valve is considered “near closed.” “Near Close” term is
useful for estimating when to change the valve trim. This value does not affect valve travel,
and it is used only for reporting the time that valve is near the seat.
Set this between Position Lower Limit and Position Upper Limit.
● Limit Switch Threshold
The Limit switch thresholds apply to the DI block setpoints.
Threshold Low
The threshold for the low limit switch that communicated by the DI block.
Threshold High
The threshold for the high limit switch that communicated by the DI block.
● Fault Control
Error Band
The position deviation limit to start deviation timer of Time 1 and Time 2.
Time 1
The position deviation time limit to show the block alarm. A negative value turns off this
function.
Time 2
The position deviation time limit to trigger the failsafe action. Enter “-1” to disable this
function. A negative value turns off this function. Use of the Time 2 failsafe may result in
unwanted process shutdowns.
● Servo Alarms (I/P Module Operating Point Fault Control)
This function is applicable only to the device revision 4 or higher (or the device revision 2 or
higher when the software download functions are available).
Figure 8.9 Servo Alarms Setting