Emerson Fisher KC Series Instruction Manual page 57

Instruction Manual
Form 5207
April 2007
FLEXURE PIVOT
ASSEMBLY
FOUR SCREWS
(KEY 9)
(KEY 10)
W4198 / IL
Figure 6-9. Exploded View of Flexure Pivot Assembly
19. Position the flapper assembly (key 11) on the
flexure pivot assembly (key 9) and start the cap
screws (key 12) that hold the flapper assembly to
the flexure pivot assembly. Do not tighten the
screws.
20. Align flapper leveling screw number 2 with the
centerline of the oblong hole in the frame as shown
in figure 6-8. Tighten the cap screws (key 12).
The following procedure (steps 21
through 23) adjusts link 2 to ensure
that it will always be in tension to
eliminate possible instability due to
lost motion.
21. Disconnect link 1 from the input element, noting
the hole location if the controller has a capsular input
element, and manually position the process pointer
to the process scale upper limit. Tape the pointer in
this position.
22. Adjust the length of link 2 by turning the
adjustment screw, shown in figure 6-10, clockwise to
increase the length or counterclockwise to
4195KA, KB, KC, and KS Controllers
FLAPPER
ASSEMBLY
AND LINK 4
Note
LINK 4
LINK 2
LINK 2 ADJUSTMENT
W3442-1 / IL
Figure 6-10. Link 2 and 4 Adjustment Locations
decrease the length, so that the pin on the end of
the link is approximately one-half of its diameter
short of aligning with the hole in the flapper
assembly, as shown in figure 6-11.
23. Connect link 2 to the flapper assembly.
24. Set the proportional band between DIRECT and
REVERSE. Do this by aligning the tab on the
proportional band adjustment knob with the hole in
the set point beam assembly as shown in figure 6-4.
25. Position the proportional band adjustment knob,
nozzle assembly, and set point beam assembly, and
nozzle tubing assembly on the frame, and screw the
relay nozzle tubing assembly nut loosely into the
frame manifold (key 135).
26. Insert the machine screw, with washer (keys 19
and 20), through the frame and start it into the relay
nozzle tubing assembly (key 18), but do not tighten.
27. Center the nozzle on the flapper as shown in
figure 6-5 while squeezing the set point beam
assembly firmly against the relay nozzle tubing
assembly. With the nozzle centered on the flapper,
tighten the machine screw (key 19). Ensure that the
nozzle is still centered on the flapper.
LINK 4 ADJUSTMENT
LINK 3
6-13