Remote Set Point (Option M); Proportional Band (Differential Gap); Changing Controller Action; Auto/Manual Switching (Option E) - Emerson Fisher KC Series Instruction Manual

Instruction Manual
Form 5207
April 2007
Section 5
4195KS Series Differential Gap
Controllers

Operating Information

This section includes descriptions of adjustments
and procedures for prestartup and startup. Location
of adjustments is shown in figures 5-1 and 5-2. To
better understand the adjustments and overall
operation of the controller, refer to the Principle of
Operation section and the schematic diagrams,
figures 5-4 and 5-5.
Some of the following procedures
require that the proportional band
knob be adjusted to between DIRECT
and REVERSE. If this is done, it will
be necessary to set the proportional
band knob to 400 (direct or reverse
action) before replacing the
proportional band indicator cover.
Adjustments for 4195KS Series
Controllers
Manual Set Point
The set point adjustment adjusts the upper or lower
switching point, depending on controller action. To
adjust the set point, open the controller cover, and
move the set point adjustment until the pointer
indicates the desired value of pressure on the
process pressure scale. Move the adjustment to the
right to increase the set point, and to the left to
decrease it. Adjusting the set point does not affect
the differential gap setting.

Remote Set Point (Option M)

CAUTION
Do not move the set point manually
on controllers with remote set point.
Doing so could damage the controller.
If the controller is equipped with remote set point
option, vary the remote set point pressure to change
4195KA, KB, KC, and KS Controllers
Note
the set point. Increase the pressure to increase the
set point, and decrease the pressure to decrease
the set point.

Proportional Band (Differential Gap)

The proportional band knob adjusts width of the gap
between switching points. Rotate the knob until the
desired value is opposite the line on the proportional
band indicator cover.

Changing Controller Action

Controller action can be switched from direct to
reverse or vice versa by loosening the screws on the
proportional band indicator cover and moving the
cover out so the proportional band knob can be
rotated to the desired action. The white portion of
the adjustment enables direct controller action; the
black portion enables reverse controller action.

Auto/Manual Switching (Option E)

Refer to figure 5-5 if the controller has the
auto/manual option. Two balance methods are
available to equalize the manual output with the
controller pressure. 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. The move the automatic/manual
switch to MANUAL. Turn the loader knob clockwise
to increase the controller output or counter clockwise
to decrease it. To switch from manual to automatic
mode, adjust the set point manually or with remote
set point pressure to move the ball into the switching
zone. Turn the switch to AUTOMATIC, and adjust
the set point manually or with the remote set point
pressure to control the output.
When the automatic/manual switch is in
AUTOMATIC, adjusting the loader knob has no
effect on the controller output. When the
automatic/manual switch is in MANUAL, changing
the set point adjustment has no effect on the
controller output.
Switching the controller between
automatic and manual, or manual and
automatic mode, without balancing
the outputs, can disturb the process
and cause controller cycling.
Note
5-1