GE MN-ValVue-v2-8-IOM Manuel de service télécharger pdf (Page 641)

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Diagnostics Tab

Figure 11 Positioner Signature

A Positioner Signature produces an input signal vs. position graph

for both increasing and decreasing signal. The signal is a simulated

signal so linearity cannot be checked.

To run a Positioner Signature: Enter a starting current, an ending

current, and the number of samples that should be taken across

the interval specified by the starting and ending current.

The positioner is slowly moved from the starting position to the

ending position and back and the two curves (up and down) are

measured and displayed.

 Step Profile: A series of step tests are performed starting

from the start position and moving toward the end position.

Each step test is a step whose length is specified in the step

parameter. Step tests are performed one after another until

the end position is reached. If two way is selected, step tests

are performed in the reverse direction as well. The time

parameter determines how long the valve position is

sampled at each step test.)

 Starting position

 Ending position

 Sample time - Number of seconds to sample at each

step

 Step length - The % position change at each step - 0

means to step the full distance from starting position to

ending position

1 2 ... 636 637 638 639 640 641 642 643 644 645 646 ... 659 660

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GE MN-ValVue-v2-8-IOM Manuel de service Page 641

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