Emerson Vilter VSS Installation, Operation & Maintenance Manual page 68

Section 4 • Operation
18. Use the UP button to rotate the actuator towards its
maximum position while watching the mV readout
on the controller screen. Discontinue pressing the
UP button when the mV reading in the "Current"
window is approximately 4800 mV. You are nearing
the mechanical stop position.
19. Pulse the UP button to carefully move the slide
valve until the mV readout "saturates", or stops in-
creasing. This is around 4800 mV Record mV maxi-
mum reading.
20. Pulse the DOWN button until the mV just start
to decrease. (This is the point where the channel
drops out of saturation). Adjust mV value to 300
mV below recorded maximum mV.
21. Press the "Set Max" button.
22. Press the "Main" button to complete calibration
and exit the "Slide Calibration" screen. The con-
troller will automatically energize the actuator and
drive it back to its minimum position (below 5%) for
pre-start-up.
Now the "Current Cap" or the "Current Vol" value will
be displayed in the window on the "Main" screen and
the "Slide Calibration" screen.
23. Gently lower the plastic cover over the top of the
actuator to where it contacts the base and O-ring
seal.
4 – 14
NOTE
VSS/VSM/VSH/VSSH • Installation, Operation and Maintenance Manual • Emerson • 35391SD
CAUTION
Do not over tighten screws. Failure to comply may
result in damage to equipment.
24. Check and make sure the cover is seated properly,
then gently tighten the four #10 screws.
25. Enable the "Slide Non-Movement Alarm" by going
to the "Setup" menu and choosing "Alarm Enable"
for the "Slide Non-Movement Option".
26. Repeat procedure to calibrate other slide valve
actuator.