TSI Instruments FHC50, Operation And Service Manual

Page: 55 / 107

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CONTROL MENU
MENU ITEM
SOFTWARE
NAME
ITEM DESCRIPTION ITEM RANGE
DEFAULT
VALUE
CONTROL
SIGNAL
FHC50 Only
CONTROL SIG The CONTROL SIG
item determines the control signal’s
output direction. As an example: if the control system closes
the exhaust damper instead of opening the damper, this
option will reverse the control signal to now open the
damper.
DIRECT OR
REVERSE
DIRECT
Kc VALUE
Ti VALUE
FHC50 Only
Kc VALUE
Ti VALUE
The Kc VALUE item changes the gain control coefficient.
When this item is entered, a value for Kc is indicated on the
display. If the controller is not controlling correctly (hunting,
oscillating, or controlling slowly) the
Kc VALUE control
coefficient may need adjusting. Decreasing Kc will slow the
control system down making it more stable.
The Ti VALUE item changes the integral control coefficient.
When this item is entered, a value for Ti is indicated on the
display. If the controller is not controlling correctly, the unit
may have an inappropriate
Ti VALUE control coefficient.
Increasing Ti will slow the control system down making it
more stable.
WARNING : The Kc VALUE and Ti VALUE items provide
you with the ability to manually change the PI
control loop variables.
DO NOT CHANGE
THESE VALUES UNLESS YOU HAVE A
THOROUGH UNDERSTANDING OF PID
CONTROL LOOPS. CONTACT TSI FOR
ASSISTANCE PRIOR TO CHANGING ANY
VALUES
. Incorrectly changing a value will
result in poor or non-existent control.
Suggestion : Before changing Kc or Ti, change the SPEED
or adjust the SENSITIVITY to try to eliminate
the problem.
Kc = 0 to 1000
Ti = 0-1000
The range of values is
very large. Poor
control may occur if
values are more than
twice or less than 1/2
the default value
Kc = 100
Ti = 110