Yokogawa YVP20S - Manual (Page 138)

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<Toc> <Ind> <14. DIAGNOSTIC SERVICES>
IM 21B04C50-01E
Initial Set Point (-10 to 110%): The base position for step test from which the set
point will change by the amount of the step size. If the step test works as cyclical,
resolution and dead band test, the value fixed at 50.
Dest. Set Point (-10 to 110%): The destination position. If it is in resolution patterns
step test, the value should be over 50.
Step Size (0 for Single Step): The size of each step change. Used for multi step
response test only. If the step size is 0, the multi-step test becomes the single step test
in the range specified by the initial set point and the dest.set point. In pattern cyclically,
the step size should be the range specified by the initial set point and the dest.set
point if the step size is 0. In pattern resolution, the step size means the first step size
(in the first cycle). In pattern resolution, the default value will be 5% if the step size is 0.
In dead band test, the valid range is 0.1 to 2.0%.
Sampling rate (20 to 1000ms): Sampling rate of each step. The valid range is 20 to
1000ms.
Num of Samples (20 to 600): Sampling point of each step. The valid range is 20 to
600.
Init Start Position Error Limit (0.1 to 3%): The maximum error allowed between the
actual position (FINAL_POSITION_VALUE) and the initial set point before starting the
test. The valid range is 0.1% or more.
Init Start Position Time Limit (10 to 600sec): The maximum waiting time. If the
actual position is not stabilizing within init start position error limit and within this time,
step response test do not start.
2-way Selection (round trip): Selecting a round trip measurement Used for normal
pattern test only. The values of the initial set point and the dest. set point determine the
direction of the valve stem movement. When the value of the initial set point is more
than that of the dest. set point, the valve steps down in one way trip, then steps up at
return trip if 2-way selection specified.
Cycle: Number of cycles for cyclical response test.
Pause(s): Equal to Sampling rate * Number of Samples