Electro-Pneumatic Positioners
2) Attach bracketed U-EPR to the actuator by using hexagon-headed and wrench bolts. Size
of the bracket hole is 6mm.
When tightening bolts, use spring washer or
similar for firm attachment to the actuator, so U-EPR will not shake by vibration or any other
impact. The direction of bracket is different by the operating condition, but normally, the
positioner is installed as shown in <Figure 6>.
- 9-
<Figure 6>
3) Set rotation position of the actuator stem at zero point, "0%".
For a single type of
actuator, it is easy to check zero point, because the actuator stem is positioned at zero point
when there is no supply pressure.
If double acting actuator is used, check
actuator stem's rotation direction (clockwise or counter-clockwise) by supplying pressure.
4) Install the fork lever as shown in <Figure 7> after setting actuator stem at zero point. Check
the direction of the actuator stem - clockwise or counter-clockwise. Installation angle of the
fork lever should be 45 degrees based on the linear shaft. For NAMUR shaft, the angle does
not matter.
Counter-Clockwise
Clockwise
<Figure 7>
