GE Valve Software Tools MN-Valvue-FF-IOM Manuel de service télécharger pdf (Page 130)

ValVueFF Software Interface to FVP

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GE Energy

4. Select Yes.

5. Select Span Calibration.

6. Change the Target Pos value by:

a. Entering a number or by incrementing until the valve is in the 100% open position,

using the same procedure as in zeroing.

b. Referring to the mechanical travel indicator on the valve and select the Apply

Calib. A dialog box appears to confirm that you want to apply the calibration.

c. Selecting Yes.

d. Selecting 50% Calibration to apply a correction for non-linearity.

e. Moving the valve until it is at the mechanically indicated 50% position, using the

same procedure as in zeroing.

f. Referring to the mechanical travel indicator on the valve.

g. Selecting the Apply Calib button. A dialog box appears to confirm that you want

to apply the calibration.

h. Selecting Yes. This provides non-linearity correction with two line segments

(Figure 94), in which 60 is entered in the Target Pos. Be advised that 60% is an

extreme example of correction.

Figure 94 Non-linearity Travel Correction

CAUTION Applying a correction to the 0% position calibration can alter

the effect of other limits and settings. The Tight Shutoff Below

parameter may need to be reconfigured. Applying a correction

to the 100% span position calibration can alter the effect of

other limits and settings. The Full Open Above parameter may

need to be reconfigured.

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GE Valve Software Tools MN-Valvue-FF-IOM Manuel de service Page 130