Emerson Fisher 3660, Instruction Manual

3660 and 3661 Positioners

Instruction Manual

Form 5265

March 2006

13

B2256-1 / IL

SIZES 30 THROUGH 40 ACTUATORS WITH

TRAVEL UP TO 30 mm (1.18 INCHES)

SIZES 30 THROUGH 40 ACTUATORS WITH

TRAVEL GREATER THAN 30 mm (1.18 INCHES)

SIZES 45 THROUGH 60 ACTUATORS WITH

TRAVEL GREATER THAN 30 mm (1.18 INCHES)

Figure 8. Feedback Arm Orientation with Positioner Mounted on Type 657 and 667 Actuators

4.  Attach the feedback arm (key 88) to the

connector bracket (key 87) using machine screws,

washers and hex nuts (keys 91, 92 and 93), but do

not tighten the hex nuts.
5.  Unscrew the two machine screws (key 24), and

remove the positioner cover (key 21).
6.  As shown in figure 5, a thin knockout section is

cast across the mounting hole in the housing. Check

to make certain that this knockout section has been

removed. If the knockout section has not been

removed, use a punch to knock it out.
7.  Set the actuator at mid-travel using a manual

loading regulator.
8.  Install the stud clamp (key 83) in the mounting

bracket (key 82). Place the mounting bracket against

the outside of the actuator leg. Attach the two

U-bolts (key 84) and the mounting bracket to the

actuator leg using washers and hex nuts (key 85 and

86), but do not tighten the nuts. Depending on the

positioner action, it may be necessary to straddle the

travel indicator scale located on the inside of the

actuator leg.

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.

9.  Attach the positioner to the stud clamp (key 83)

using the sealing washer and hex nut (keys 89 and

90), but do not tighten the nut. Visually center the

center line of the slot in the feedback arm (key 88)

with the center line of the hole in the housing. Then,

tighten the nuts (keys 90 and 86) only tight enough

to prevent the positioner and mounting bracket from

moving on the actuator leg. Locate the feedback

lever assembly (key 19) so it may be temporarily

installed into the positioner housing (key 1) and the

feedback arm (key 88) to verify alignment. Do not

install the range spring at this time. Place the pilot

shaft (key 19A) in the slot of the feedback arm, 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