Fisher 3660 - Page 11

Instruction Manual
D101402X012
3660 and 3661 Positioners
September 2015
11
Figure 4. Feedback Plate Orientation with Positioner Mounted on Fisher 1250, 1250R, and 3024S Actuators
FOR SIZE 30 AND 34 ACTUATORS WITH TRAVEL
BETWEEN 20 AND 30 mm (0.787 AND 1.18 INCHES)
POSITIONER
ACTUATOR LEG
STEM CONNECTOR
FEEDBACK
PLATE
PILOT SHAFT
FEEDBACK LEVER
ASSEMBLY
FOR SIZE 30,34 AND 45 ACTUATORS WITH
TRAVEL GREATER THAN 30mm (1.18 INCHES)
POSITIONER
ACTUATOR LEG
STEM CONNECTOR
FEEDBACK
PLATE
PILOT SHAFT
FEEDBACK LEVER
ASSEMBLY
B2260‐1
FOR SIZE 45 ACTUATORS WITH TRAVEL BETWEEN
20 AND 30 mm (0.787 AND 1.18 INCHES)
STEM CONNECTOR
FEEDBACK
PLATE
ACTUATOR STEM
FEEDBACK
ADAPTOR
VALVE STEM
USE THESE HOLES
WHEN MOUNTING
THE FEEDBACK
ADAPTOR TO THE
FEEDBACK PLATE
Note
Do not install the range spring in the following step. Feedback lever assembly (key 19) installation in the next step is only
temporary to permit verifying alignment.
e. Install the positioner on the actuator by placing the bracket (key 64) around the appropriate actuator leg.
Visually center the center line of the slot in the feedback plate (key 68) with the center line of the hole in the
housing. Then, tighten the nuts (key 66) only tight enough to prevent the positioner from moving on the
actuator leg. Locate the feedback lever assembly (key 19) so that it may be temporarily installed into the
positioner housing (key 1) and the feedback plate (key 68) to verify alignment. Do not install the range spring at
this time. Place the pilot shaft (key 19A) in the slot of the feedback plate, and, at the same time, insert the
feedback shaft in the hole of the positioner housing. Depress the feedback lever assembly inward until it stops
against the housing. Make certain the slots in both the feedback lever assembly and the feedback plate are
horizontal with each other and that the feedback lever assembly and the feedback plate are parallel with each