Fisher 4195 KB Series Instruction Manual page 27

4195KB and KC Series controllers with
anti-reset windup (suffix letter F) are
supplied with two O-rings (key 52), valve
cover (key 51), and two machine screws
(key 53). Use these parts in the next
step.
1. For controllers with anti-reset windup (suffix letter
F), record the direction of the arrow on the anti-reset
windup relief valve (key 55). Remove the relief valve
and install the two O-rings (key 52) and valve cover
(key 51) supplied with the controller. Secure the valve
cover with the two machine screws (key 53) provided.
2. If necessary, remove the two machine screws (key
6) and lift off the proportional band indicator cover (key
36).
3. If the controller has the external feedback option
(available with the 4195KB Series only), connect the
controller output to the external feedback connection.
See figure 2–5 for the location of the output and exter-
nal feedback connections.
4. Provide regulated supply pressure to the controller.
Do not exceed the normal operating pressure in table
1–6.
5. For a controller with manual set point, move the set
point indicator to the mid-scale mark on the process
scale. For a controller with remote set point (suffix let-
ter M), adjust the remote set point pressure until the
set point indicator is at the mid-scale mark on the pro-
cess scale.
6. Set the reset adjustment to 0.01 minutes per re-
peat.
7. If the controller has rate (4195KC Series), turn the
rate adjustment to OFF.
8. Apply process pressure equal to the mid-scale val-
ue of the process scale span. If pressure is not avail-
able to pressure the input element to mid-scale value,
an alternate method is to disconnect link number 1 at
the input element and tape the process pointer at mid-
scale mark on the process scale. If the controller has a
capsular input element, note the hole where link num-
ber 1 is connected to the input element, then discon-
nect link 1. This method should only be used if pres-
sure is not available to pressure the input element to
the mid-scale value.
Because of the high controller gain, the
controller output will not remain stable
in steps 9 through 13. The controller
output gauge is adequate to check the
output pressure during this procedure.
Note
Note
4195KA, KB, and KC Series
9. Set the proportional band between DIRECT and
REVERSE.
10. The controller output should be relatively stable at
any value within the output range. If not, adjust flapper
leveling screw 2 (the screw nearest the nozzle) until
the output is relatively stable.
11. Set the proportional band to 30 percent DIRECT.
The controller output should be relatively stable at any
value within the output range. If not, adjust flapper lev-
eling screw 3 (the screw nearest the nozzle) until the
output is relatively stable.
12. Set the proportional band to 30 percent RE-
VERSE. The controller output should be relatively
stable at any value within the output range. If not, ad-
just flapper leveling screw 1 (the screw nearest the
nozzle) until the output is relatively stable.
13. Repeat steps 9 through 12 until the controller out-
put remains relatively stable without further flapper
leveling screw adjustment.
Steps 14 through 20 check the flapper
alignment.
14. Set the proportional band to 30 percent DIRECT.
15. Apply process pressure to the input element or, if
link 1 was disconnected, remove the tape from the
process pointer and move the pointer until it aligns
with the right-hand edge of the set point indicator as
shown in figure 4–4.
The controller output should be within 2 psig (0.14 bar)
of the supply pressure.
16. Apply process pressure to the input element or, if
disconnected, move the process pointer until it aligns
with the left-hand edge of the set point indicator as
shown in figure 4–4.
The controller output pressure should go to 0 psig.
17. Set the proportional band to 30 percent RE-
VERSE.
18. Apply process pressure to the input element or, if
disconnected, move the process pointer until it aligns
with the right-hand edge of the set point indicator as
shown in figure 4–4. The controller output should be 0
psig.
19. Apply process pressure to the input element or, if
disconnected, move the process pointer until it aligns
with the left-hand edge of the set point indicator as
shown in figure 4–4. The controller output should be
within 2 psig (0.14 bar) of the supply pressure.
20. If the controller does not perform as indicated in
steps 14 through 19, the flapper is not correctly
aligned. This may occur because the output was not
Note
4–7