Emerson Fisher KC Series Instruction Manual page 59

Instruction Manual
Form 5207
April 2007
supply pressure. If not, adjust flapper leveling screw
1 (the screw nearest the nozzle) until the output is
within 0.14 bar (2 psig) of supply pressure.
39. Loosen the two adjustment screws on link 4,
shown in figure 6-10, and connect the link to the
bellows bracket (key 31), allowing the link to find its
free length.
40. Tighten the two adjusting screws on link 4.
41. Lift link 4 out of the hole in the bellows bracket
(key 31) and ensure it drops back into the hole
under its own weight. If not, repeat steps 39 and 40.
42. Adjust the proportional band to 40 percent
REVERSE or DIRECT depending on the desired
controller action.
43. Adjust the set point to the process scale lower
limit.
44. Tape the process pointer at the process scale
lower limit. The output pressure may be anywhere
between 0.2 to 1.0 bar (3 and 15 psig) for a 0.2 to
1.0 bar (3 to 15 psig) output signal range or between
0.4 to 2.0 bar (6 and 30 psig) for a 0.4 to 2.0 bar (6
to 30 psig) output signal range. If the output is not
within the specified range, adjust the flapper leveling
screw nearest the nozzle until the output is within
the range specified. Record the controller output
pressure.
45. Adjust the set point to the process scale upper
limit.
46. Remove the tape and move the process pointer
until the controller output equals the pressure
recorded in step 44. Note the process pressure
indication.
47. The process pressure indication should be
within ±2 percent of the process scale upper limit.
If the process pressure indication in step 46 is
greater than the process scale upper limit by 2
percent, loosen the shoe adjustment screws (key
30), shown in figure 6-3, and move the set point
beam shoe (key 29) slightly away from the center of
the flapper assembly.
If the process pressure indication in step 46 is less
than the process scale upper limit by 2 percent,
loosen the shoe adjustment screws (key 30), shown
4195KA, KB, KC, and KS Controllers
in figure 6-3, and move the set point beam shoe
(key 29) slightly toward the center of the flapper
assembly.
48. Repeat steps 43 through 47 until the error is
less than 2 percent of the process scale span at the
process scale upper limit.
49. Remove the tape from the process pointer and
reconnect link 1 to the input element. If the controller
has a capsular input element, be sure to reconnect
link 1 in the same hole noted in step 21.
50. Position the controller assembly in the case and
start, but do not tighten the nine mounting screws.
Slide the controller assembly down to assure an
O-ring seal at the pressure connections along the
bottom of the case. Hold the controller assembly in
place while tightening the nine mounting screws.
51. Perform the controller calibration procedures
and, if necessary, the appropriate remote set point
calibration procedure in Section 3, 4, or 5.
52. Mount the controller as described in the
Installation section.
53. Connect the external piping to the controller.
Replacing the Proportional, Reset or
Positive Feedback Bellows
Refer to the Maintenance WARNING
on page 6-1.
Refer to figure 6-12, unless otherwise noted.
1. Remove the controller assembly from the case
by performing steps 1 through 3 of the case and
cover replacement procedure.
2. Remove the two screws (key 6) and lift off the
proportional band indicator cover (key 36).
3. Disconnect link 4 (key 65) from the bellows
bracket (key 31).
4. Remove the two machine screws (key 35) and
washer (key 362) from the bellows assemblies.
WARNING
6-15