Startup For 4195Ka Series Controllers; Manual Set Point - Emerson Fisher KC Series Instruction Manual

Instruction Manual
Form 5207
April 2007
If the controller has the auto/manual
station (suffix letter E), be sure the
controller is in the automatic mode
before performing 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. Adjust the proportional band for 5 percent
DIRECT.
6. 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 psig, a pressure source is not
required.
7. The controller output pressure should be 0 bar (0
psig).
8. Rotate the proportional band to 5 percent
REVERSE.
9. The controller output should be within 0.14 bar (2
psig) of the supply pressure.
10. 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 4195KA
Series calibration procedure for recalibration.

Startup for 4195KA Series Controllers

Perform the prestartup checks and, if necessary,
calibrate the controller prior to this procedure.
4195KA, KB, KC, and KS Controllers
Note
When performing the startup
procedures, keep in mind that the
initial settings are guidelines. They
will vary depending on the actual
process being controlled.
1. Be sure the supply pressure regulator is
delivering the proper supply pressure to the
controller.
2. For controllers with:

Manual set point:

Move the set point adjustment to the desired set
point.
Remote set point:
a. See figure 2-5 for the location of the remote
set point connection. Connect an adjustable
pressure source to the remote set point
connection.
b. Adjust the pressure source until the set point
indicator reaches the desired set point.
Remember: Increasing the remote set point
pressure increases the set point.
3. Set the proportional band adjustment to 100
percent for fast processes. For slow processes,
calculate the proportional band percentage from the
equation below:
P.B. + 200
For example:
200
2.1 bar
4. Create a load upset by momentarily changing the
set point. Check for system cycling. If the system
does not cycle, lower the proportional band setting
(thus raising the gain) and disturb the system again
by changing the set point. Continue this procedure
until the system cycles. At this point, double the
proportional band setting (proportional band setting
×2).
5. Check the stability of the recommended
proportional band setting by introducing a
disturbance and monitoring the process.
Note
Allowable Overshoot
Pressure Span
0.14 bar
^ 13%
3-3