Fisher 4195 KB Series Instruction Manual page 44

FLAPPER LEVELING
SCREW NUMBER 2
OBLONG HOLE FLEXURE PIVOT
IN FRAME ASSEMBLY SCREWS (KEY 12)
W4770 / IL
Figure 5–8. Leveling Screw Alignment
FLEXURE PIVOT
ASSEMBLY
FOUR SCREWS
(KEY 9)
(KEY 10)
W4198 / IL
Figure 5–9. Exploded View of Flexure Pivot Assembly
17. With the controller in the upright position, move
the flexure pivot assembly down as far as possible and
tighten the four screws (key 10).
18. Place the flapper assembly (key 11) on the flexure
pivot assembly (key 9) with link 4 through the hole in
the frame.
19. Position the flapper assembly (key 11) on the flex-
ure 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 5–8. Tighten the cap screws (key 12).
FLAPPER
ASSEMBLY
FLAPPER
ASSEMBLY
AND LINK 4
4195KA, KB, and KC Series
LINK 4
LINK 2
LINK 2 ADJUSTMENT
W3442-1 / IL
Figure 5–10. Link 2 and 4 Adjustment Locations
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 adjust-
ment screw, shown in figure 5–10, clockwise to in-
crease the length or counterclockwise to decrease the
length, so that the pin on the end of the link is approxi-
mately one-half of its diameter short of aligning with
the hole in the flapper assembly, as shown in figure
5–11.
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 propor-
tional band adjustment knob with the hole in the set
point beam assembly as shown in figure 5–4.
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
20), through the frame and start it into the relay nozzle
tubing assembly (key 18), but do not tighten.
LINK 4 ADJUSTMENT
LINK 3
Note
5–11