GE Valve Software Tools MN-Valvue-FF-IOM Service Manual Page 128

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ValVueFF Software Interface to FVP
112
GE Energy
Search Stops and Auto Tune In One Step
This procedure is a combination of Auto Stop Limits, Find Stops and Auto Tuning. You run
two processes with a single click.
WARNING Observe all safety precautions. During this process, the valve
strokes the valve over its full range. Keep clear of moving
valve and actuator parts.
1. Isolate the valve from the process.
2. Select Search Stops + Auto Tune. A message box appears stating that the valve
strokes.
3. Select Yes to proceed. The Progress dialog box appears. This procedure strokes the
valve from stop to stop and then tune for a few minutes. If you select Cancel the
tuning stops and the parameters remain at their prior values.
Manual Parameter Adjustment
The parameters before tuning are shown on the left (Original). The parameters
determined by Auto Tune are show on the right (Now). The new values (Now) become
effective when you select OK. Select Cancel to return the original values. After Auto Tune
is complete or as an alternative to Auto Tune, the parameters can be entered manually in
the text boxes (Now).
Travel Calibration Tab
Use the Travel Calibration tab to adjust calibration at 0% and 100% to match the valve's
working stroke when there is over-travel at one or both stops. Additionally, if the valve
linkage introduces a non-linearity, it can be corrected by setting a correction at 50%. The
corrections in this dialog box are applied over corrections applied with the Open Stop
Adjust tool. Use only one set of correction tools for adjusting zero, span, and non-linearity
calibrations.
NOTE If manual tuning is performed write Manual Tune Only in the
TB block tag descriptor.
Table 10 Servo Tuning Parameter Ranges
Parameter Defaults Range Units
Proportional Gain 120 0.5 to 1300 Dimensionless
Integral Time 15 0 (disables); 2 to 50 Seconds
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