Emerson VSM, VSR, VSS Slide Valve Actuator Installation & Calibration, Press the “Set Max” button

Slide Valve Actuator Installation & Calibration

21.Use the INC button to rotate the actuator to- wards its maximum position while watching the millivolt readout on the controller screen. Discontinue pressing the INC button when the millivolt reading in the “Current” window is approximately 9200 millivolts (7900 mil- livolts for the 2783J qualified analog boards). You are nearing the mechanical stop position.

22.Pulse the INC button to carefully move the slide valve until the millivolt readout “saturates”, or stops increasing. This is around 9500 millivolts (8400millivoltsfor2783qualifiedanalogboards).

23.Pulse the DEC button until the millivolts just start to decrease. (This is the point where the channel drops out of saturation).Ad- just millivolt value to 300 millivolts below recorded maximum millivolts in step #22.

24.Press the “Set Max” button.

25.Press the “Main” button to complete calibra- tion and exit the “Slide Calibration” screen. The controller will automatically energize the actuator and drive it back to its mini- mum position (below 5%) for pre-start-up.

26.Note: Now the “Current Cap” or the “Current Vol” value will be displayed in the window on the “Main”screenandthe“SlideCalibration”screen.

27.Gently lower the plastic cover over the top of the actuator to where it contacts the base and o-ring seal. After making sure the cover is seated properly, gently tighten the four #10 screws. Caution: The plastic cover will crack if the screws are over tightened.

28.Enable the “Slide Non-Movement Alarm” by go- ing to the “Setup” menu and choosing “Alarm Enable” for the “Slide Non-Movement Option”.

29.This completes the calibration for this chan- nel either capacity or volume. Repeat the same procedure to the other channel.

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