Electro-Pneumatic Positioner
YT-1000 / 1050 series
Product Manual
Ver. 1.30
46
5)
Insert the connection bar between the feedback lever and lever spring. The connection bar must
be located upward from the lever spring as shown the below left figure. If it is located downward
from the lever spring as shown the below right figure, the connection bar or the lever spring will be
worn out quickly because of excessive strong tension.
Fig. 4-6: Proper way to insert connection bar between feedback lever and lever spring
6)
Check if feedback lever is vertical to the valve stem at 50 % of the valve stroke. If it is not vertical,
adjust the bracket or the connection bar to make vertical. Improper installation may cause poor
linearity.
Fig. 4-7: Feedback lever and valve stem
7)
Check the valve stroke. The stroke numbers are engraved on the feedback lever of the positioner.
Position the connection bar at the number on the feedback lever which corresponds with the
desired valve stroke. To adjust, move the bracket, the connection bar or both.
※
The effective linear lever angle is 23 degree.
