Emerson Fisher KC Series Instruction Manual page 74

4195KA, KB, KC, and KS Controllers
Replacing Capsular Element Controller Link 1
1. Remove the two screws (key 6), and lift off the
proportional band indicator cover (key 36).
2. Note the hole position of link 1 and disconnect
the link from the short pivot clevis assembly and
from the process pointer. Remove the link.
3. Attach the replacement link in the same holes
noted in step 2 to the process pointer and the short
pivot clevis assembly. If you do not know in which
hole in the process pointer the link was connected,
place it in the middle hole. If during the process
indicator zero and span calibration, the pointer will
not travel the full scale, even after full span
adjustment, move the link to the bottom hole (the
hole nearest the pointer pivot). If the process pointer
has too much travel, move the link to the top hole
(the hole furthermost from the pointer pivot).
4. Move the set point indicator, either manually or
with remote set point pressure, to the mid-scale
mark on the process scale and set the proportional
band between DIRECT and REVERSE.
5. The process pointer should be aligned with the
pointer subassembly as shown in figure 6-15. If not,
loosen the zero adjustment locking screw and adjust
the process pointer zero adjustment to align the
process pointer and pointer subassembly. Tighten
the zero adjustment locking screw.
6. Apply process pressure equal to the mid-scale
value of the process scale span. The process
pointer should indicate mid-scale ±3 percent of the
process scale span. If not, loosen the screw in link 1
or link 5, and move the pointer to the mid-scale mark
on the process scale. Tighten the screw.
7. Perform the controller calibration procedures and,
if necessary, the appropriate remote set point
calibration procedure in Section 3, 4, or 5.
Replacing Capsular Element Controller Link 2
1. Remove the two screws (key 6), and lift off the
proportional band indicator cover (key 36).
2. Disconnect link 2 from the process pointer and
from the flapper assembly (key 11). Remove the
link.
3. Install the replacement link with the screw head
nearest the process pointer as shown in figure 6-21.
Connect the link to the process pointer only.
4. The process pointer should be lined up with the
pointer subassembly as shown in figure 6-15. If not,
loosen the zero adjustment locking screw and adjust
the process pointer zero adjustment to align the
6-30
pointer with the process pointer subassembly.
Tighten the zero adjustment locking screw.
5. Move the set point indicator, manually or with
remote set point pressure, to the process scale
lower limit and set the proportional band at 5 percent
REVERSE. The nozzle should not be touching the
flapper. If it is, adjust flapper leveling screw 1 (the
screw nearest the nozzle) until clearance is
obtained.
6. Note the hole position and disconnect link 1 from
the short pivot clevis assembly. Manually position
the process pointer to the process scale upper limit
and tape the process pointer in this position.
7. Adjust the length of link 2 (by turning the
adjusting screw clockwise to increase the length or
counterclockwise to 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. This
adjustment provides the proper tension on the link to
eliminate lost motion.
8. Connect link 2 to the flapper assembly.
9. Remove the tape from the process pointer and
reconnect link 1 to the hole in the short pivot clevis
assembly noted in step 6.
10. Perform the controller calibration procedures
and, if necessary, the appropriate remote set point
calibration procedure in Section 3, 4, or 5.
Replacing Capsular Element Controller Link 3
1. Remove the two screws (key 6), and lift off the
proportional band indicator cover (key 36).
2. Disconnect link 3 from the set point indicator and
the set point beam assembly (key 23).
3. Adjust the replacement link to the same length as
the link removed.
4. Install the replacement link with the screw head
toward the set point beam assembly as shown in
figure 6-21.
5. Check that the set point beam bias spring (key
28) is correctly located in the frame bore and the
spring seat on the set point beam assembly as
shown in figure 6-3.
6. Move the set point indicator to the mid-scale
mark on the process scale.
7. Apply process pressure to position the process
pointer at the mid-scale mark on the process scale.
8. Adjust the proportional band to 5 percent
DIRECT. Turn flapper leveling screw 3 (the screw
nearest the nozzle) until the nozzle just touches the
flapper.
Instruction Manual
Form 5207
April 2007