21
YT-3400/3450 series
3.4.2
Installation Steps
1. Please check the actuator
’s stem height and adjust the bracket by referring to the
bracket table.
2. Attached the bracket onto the actuator. It is recommended to use spring washer so the
bolts will not be loosen from vibration.
3. Set rotation position of the actuator stem at 0%. For single acting actuator, it is easy to
check 0% point by supplying no pressure to the actuator. For double acting actuator,
check actuator
stem’s rotation direction – clockwise or counter-clockwise - by supplying
pressure to the actuator.
4. For FORK LEVER type, install the fork lever after setting actuator
’s stem at 0%. Check
the actuator stem
’s rotation direction – clockwise or counter-clockwise.
Installation angle of the fork lever should be 45 degrees in relation to the linear shaft.
For NAMUR shaft installation, the angle does not matter.
Fig. 23:
Counter-clockwise and clockwise rotation.
5. After setting fork lever position, assemble lock nuts which are located on the bottom of
the fork lever. Ensure to set the height of the upper fork lever between
6~11mm
, which
is lower than the upper bracket
’s height.
Fig. 24:
Height to the bracket (fork lever type)
6. Attach the positioner to the bracket. Fix the clamping pin on the main shaft
’s center of
the positioner and insert connection pin into the fork lever slot. This will lock to the fork
lever spring. Setting alignment of the main shaft of the positioner and center of the
actuator
’s stem is very important. Poor alignment of the main shaft and the actuator’s
