Technical Specifications

ValVue Digital Communications Software Ver. 2.80
638
GE Oil & Gas
Menu - Calibrate
When you right-click on the Calibrate tab, a context menu appears:
 Run Find Stops - Runs the automatic position calibration process. To determine valve
position, the positioner must measure and save the closed and open positions of the
valve. This can be done automatically by running the Find Stops procedure from the
Calibrate tab. The SVI2 first exhausts the actuator and measures the position, then fills
the actuator and measures the position. From these measurements the valve position
is determined. Correction can be made for nominal valve travel if it is less than full
travel (see Open Stop Adjustment). A progress dialog appears while the find stops
process is running.
 Manual Find Stops - Allows you to set the position calibration by moving the valve full
closed and full open. On very large valves, the automatic find stops routine may
timeout before the valve has reached the end of travel. Manual find stops allows
calibration of these valves.
On some very large valves or valves with non-Masoneilan actuators, it is possible that
the automatic Find Stops procedure will not find the correct end positions of the travel.
A semi-automatic method of calibrating the stop positions is provided.
When Manual Find Stops is selected, the valve is moved to full closed and you are
asked to respond when the valve has reached the closed position. The valve is moved
to full open and you are asked to respond when the valve has reached the full open
position.
For some valves the open position stop exceeds the nominal travel of the valve. See
Open Stop Adjustment for details about how to make this adjustment.
 Open Stop Adjustment - Recomputes the position scale so that at the value entered in
the open stop adjustment edit box as a percent of full stops, the position reads 100%.
 Run Auto Tune - Automatically finds appropriate PID parameters for the valve.
 Full Open - Moves the valve to full open. This command work by taking the valve out of
closed loop control and send a high or low signal to the I/P.
 Full Closed - Moves the valve to full closed. This command work by taking the valve out
of closed loop control and send a high or low signal to the I/P.
 Set Valve Position - Allows you to set the valve to a specific position. This is
accomplished by momentarily returning to manual mode, repositioning the valve, and
returning to setup mode.
 Reset to Factory Cal - Resets the signal calibration its their factory setting.
 Detach Trend - Removes the trend display from the tabbed dialog and creates a
separate trend display.
 Help - Displays the help file at the Calibrate tab instructions.