Switching The Auto/Manual Station; (Suffix Letter E); Prestartup Checks For 4195Kb And Kc Series Controllers - Emerson Fisher KC Series Instruction Manual

Instruction Manual
Form 5207
April 2007

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 4-1 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 automatic/manual switch is in AUTO,
adjusting the loader knob has no effect on the
controller output. When the automatic/manual switch
is in MANUAL, changing the set point has no effect
on the controller output.
Prestartup Checks for 4195KB and KC
Series Controllers
Refer to figure 4-1 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.
If the controller has the auto/manual
station (suffix letter E), be sure the
controller is in the automatic mode
before performing prestartup checks.
If the controller has the external
feedback option, connect the
4195KA, KB, KC, and KS Controllers
Note
Note
controller output connection to the
external feedback connection (see
figure 2-5). Adjust the controller for
full output pressure and with the
RESET knob adjusted to 0.01
minutes/repeat, verify the tubing
connections do not leak. Disconnect
after completing the prestartup
checks.
1. Provide a means of measuring the controller
output pressure by connecting the controller output
to a pressure gauge. Connect supply pressure to the
supply pressure regulator and be sure it is delivering
the proper supply pressure to the controller. Do not
exceed the normal operating pressure in table 1-6.
2. For a controller with remote set point (suffix letter
M), connect regulated pressure of 0.2 to 1.0 bar (3
to 15 psig) or 0.4 to 2.1 bar (6 to 30 psig) to the
remote set point connection at the top of the
controller case.
3. Remove the two machine screws (key 6) and lift
off the proportional band indicator cover (key 36).
4. Adjust the set point a minimum of 20 percent of
input span above the process pointer.
5. Turn the reset adjustment to 0.01 minutes per
repeat.
6. Turn the rate adjustment to OFF (4195KC
Series).
7. Adjust the proportional band for 5 percent
DIRECT.
8. If necessary, connect a pressure source to the
process connection and adjust the process pointer
to the last mark on the left side of the scale. If the
last scale mark is 0 bar (0 psig), a pressure source
is not required.
9. The controller output pressure should be 0 bar (0
psig).
10. Rotate the proportional band to 5 percent
REVERSE.
11. The controller output should be within 0.14 bar
(2 psig) of the supply pressure.
12. If the controller output is within tolerance, adjust
the proportional band to 400 percent in the desired
action. Secure the proportional band indicator cover
(key 36) with the machine screws (key 6), and go to
the startup procedure. If the controller output
pressure is not within tolerance, go to the 4195KB
and KC Series calibration procedure for
recalibration.
4-3