Yokogawa YVP20S - Manual (Page 137)

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IM 21B04C50-01E
<Toc> <Ind> <14. DIAGNOSTIC SERVICES>
14.3.4 Step Response Test
This signature function will measure the step response characteristic of the control valve
system. There are two types of step response test: single step response test and multiple
step response test.
The multiple step response test consists of a series of single step response test, with a new
set point for each following test incremented by the step size, executed consecutively in the
overall range specified by the user. All individual single step tests use the same step size
specified by the user except the very last one which uses the step size of the remaining
portion.
There are four patterns of step response test: normal, cyclical, resolution and dead band
test.
• Measurement Parameter
The step response test measures time-series changes in the valve position from the initial
set point to the dest. set point. Valve position means FINAL_POSITION_VALUE.Value.
• Measurement Setting Parameter
The measurement condition defines as following parameters:
Figure 14.12 Step Response Setting