GE MN-ValVue-v2-8-IOM Manuel de service télécharger pdf (Page 574)

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ValVue Digital Communications Software Ver. 2.80

574

GE Oil & Gas

Position Limit Stops:

Position Lower Limit /

Position Upper Limit

The SVI allows you to establish software limit stops. If enabled, dur-

ing correct operation of the SVI, the control functions of the SVI will

not allow the valve position to be lower than the lower position limit

or above the upper position limit This option does not provide

mechanical stops for the valve. In an electrical or air failure the valve

goes to the fail safe position without regard to the software limit

stops. The full open and full closed buttons similarly ignore the set-

tings of the software limit stops.

Apply Clicking Apply saves to the SVI any changes that have been made to

configuration or calibration parameters.

Change Mode The SVI can be in any of several operating modes:

 Operating: In this mode the SVI responds to the input signal

and positions the valve appropriately (indicator green).

 Manual: In this mode the valve does not respond to the input

signal. Instead it remains stable in one position which is the

position that the valve was when manual mode was entered

or a new position selected by the user (see Setpoint) (indicator

yellow).

 Configure: In this mode you can set configuration parameters

of the positioner or controller (indicator yellow).

 Calibrate: In this mode you can set calibration parameters of

the positioner (indicator yellow).

 Diagnostic: In this mode you can run response time tests, step

response tests, and positioner signatures (indicator yellow).

 Bumpless transfer: This is a transition mode when you select

operating mode from manual mode (see Bumpless Transfer)

(indicator red).

 Failsafe: When the SVI cannot operate correctly the device

goes to the failsafe position and remains in the failsafe mode

until the user intervenes (indicator red).

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GE MN-ValVue-v2-8-IOM Manuel de service Page 574

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