Model 8670 SUREFLOW Room Pressure Controller Manual - TSI

CHANGE Kc The CHANGE Kc item is used to read and change (see
WARNING below) the gain control coefficient. When this
item is entered, a value for Kc is indicated on the display. If
the SUREFLOW is not controlling correctly, the unit may have
an inappropriate gain control coefficient.
WARNING: The CHANGE Kc item provides the user with the ability to manually change the
Kc value. THE Kc VALUE MUST NEVER BE CHANGED WITHOUT
ASSISTANCE FROM THE TSI FACTORY! Contact TSI for assistance in
determining your control problem and for instructions on how to change the Kc
value. Incorrectly changing the Kc value may result in poor control or no
control at all.
CHANGE Ti The CHANGE Ti item is used to read and change (see
WARNING below) the integral control coefficient. When
this item is entered, a value for Ti is indicated on the
display. If the SUREFLOW is not controlling correctly, the
unit may have an inappropriate integral control coefficient.
WARNING: The CHANGE Ti item provides the user with the ability to manually change the
Ti value. THE Ti VALUE MUST NEVER BE CHANGED WITHOUT
ASSISTANCE FROM THE TSI FACTORY! Contact TSI for assistance in
determining your control problem and for instructions on how to change the Ti
value. Incorrectly changing the Ti value may result in poor control or no
control at all.
CHANGE Td The CHANGE Td item is used to read and change (see
WARNING below) the derivative control coefficient.
When this item is entered, a value for Td is indicated on the
display. If the SUREFLOW is not controlling correctly, the
unit may have an inappropriate derivative control
coefficient.
WARNING: The CHANGE Td item provides the user with the ability to manually change the
Td value. THE Td VALUE MUST NEVER BE CHANGED WITHOUT
ASSISTANCE FROM THE TSI FACTORY! Contact TSI for assistance in
determining your control problem and for instructions on how to change the Td
value. Incorrectly changing the Td value may result in poor control or no
control at all.
AUTOTUNE The AUTOTUNE item is used to select the optimal control
coefficients for a specific laboratory. The AUTOTUNE
function should only be used when high-speed response is
needed for room pressure control. The SPEED function
should be used in normal conditions to adjust response time.
WARNING: The AUTOTUNE function provides the operator with the ability to set up the
PID coefficients for optimum control. THE AUTOTUNE FUNCTION
SHOULD NOT BE RUN WITHOUT ASSISTANCE FROM THE TSI
FACTORY. Contact TSI for assistance.
42 Chapter 9