Changing Controller Action; Switching The Auto/Manual Station; (Suffix Letter E); Prestartup Checks For 4195Ka Series Controllers - Fisher 4195 KB Series Instruction Manual

4195KA, KB, and KC Series
Figure 3–2. Changing Controller Action
W3439 / IL
(4195KA Series Controllers)

Changing Controller Action

To change the controller action from direct to reverse
or vice versa, loosen the screws on the proportional
band indicator cover. Lift the cover out as shown in
figure 3–2 and rotate the proportional band adjustment
to the desired action. Setting the proportional band to
the values in the white portion of the adjustment pro-
vides direct controller action; setting porportional band
in the black portion provides reverse controller action.
Bourdon Tube or Capsular Element Controllers for
Positive or Compound Pressure
For direct control action:
An increasing sensed pressure increases output pres-
sure.
For reverse control action:
An increasing sensed pressure decreases output pres-
sure.
Capsular Element Controllers for Vacuum Pressure
For direct control action:
An increasing sensed vacuum increases output pres-
sure.
For reverse control action:
An increasing sensed vacuum decreases output pres-
sure.
After changing the action, tighten the screws on the
proportional band indicator cover.
3–2

Switching The Auto/Manual Station

(suffix letter E)

CAUTION
Switching the controller between auto-
matic and manual mode without balanc-
ing can disturb the process and cause
controller cycling.
Refer to figure 3–1 if the controller has the auto/manu-
al station (suffix letter E). To switch from automatic to
manual mode, or from manual to automatic, you must
first balance the manual output with the controller out-
put. Two balance methods are available to equalize
the manual output with the controller output.
To switch from automatic to manual mode, carefully
adjust the loader knob until the metal ball inside the
plastic tube moves into the switching zone. Then
move the automatic/manual switch to MANUAL. Turn
the loader knob clockwise to increase the controller
output or counterclockwise to decrease it.
To switch from manual to automatic mode, adjust the
set point to move the ball into the switching zone. Turn
the switch to AUTO and adjust the set point to control
the output.
When the auto/manual switch is in AUTO, adjusting
the loader knob has no effect on the controller output.
When the auto/manual switch is in MANUAL, changing
the set point has no effect on the controller output.
Prestartup Checks for 4195KA Series
Controllers
Refer to figure 3–1 for adjustment locations and refer
to figure 5–24 for key number locations.
When performing the checks, open loop conditions
must exist. An open loop exists when the controller
output does not affect the input pressure or other con-
trol signal to the controller.
If the controller has the auto/manual sta-
tion (suffix letter E), be sure the control-
ler is in the automatic mode before per-
forming the prestartup checks.
1. Provide a means of measuring the controller output
pressure by connecting the controller output to a pres-
sure gauge. Connect supply pressure to the supply
pressure regulator and be sure it is delivering the
proper supply pressure to the controller. Do not ex-
ceed the normal operating pressure in table 1–6.
2. For a controller with remote set point (suffix letter
M), connect regulated pressure of 3 to 15 psig (0.2 to
Note