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

4195KA, KB, KC, and KS Controllers
W3439 / IL
Figure 3-2. Changing Controller Action on
4195KA Series Controllers
To adjust the proportional band, open the controller
cover and locate the proportional band adjustment
(PB ADJ) knob. Rotate the knob until the desired
value is opposite the line on the proportional band
indicator cover.

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 provides direct controller action;
setting proportional band in the black portion
provides reverse controller action.
Bourdon Tube or Capsular Element Controllers
for Positive or Compound Pressure
D For direct control action:
An increasing sensed pressure increases output
pressure.
D For reverse control action:
An increasing sensed pressure decreases output
pressure.
Capsular Element Controllers for Vacuum
Pressure
D For direct control action:
An increasing sensed vacuum increases output
pressure.
3-2
D For reverse control action:
An increasing sensed vacuum decreases output
pressure.
After changing the action, tighten the screws on the
proportional band indicator cover.

Switching The Auto/Manual Station

(suffix letter E)

Switching the controller between
automatic and manual, or manual and
automatic mode, without balancing
the outputs, can disturb the process
and cause controller cycling.
Refer to figure 3-1 if the controller has the
auto/manual 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 output. 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 7-1 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
control signal to the controller.
Instruction Manual
Form 5207
April 2007
Note