Ai C20 RECIRCULATING CHILLER USER’S MANUAL
13
Under the main mode, press and hold “SET” and “LEFT” button simultaneously to enter the lock screen (LK). Enter 18
or 28 and press the “SET” button to access the advanced setting tables on the following pages.
Table 1: LK-18
Table 1: LK-28
Prompt
Name
Description
Factory
value
P
Proportional
Increasing P may reduce temperature overshooting. Decrease P to allow
for a faster heating rate.
5.0
I
Integral time
Increase I to lower temperature fluctuation
400
D
Derivative
Differential time constant, d is larger, the differential
function is stronger and can overcome the overshoot.
400
Ar
Overshoot
inhibition
Used to suppress overshoot (Ar identified as: 1.5 to 2 times the steady-
state output duty cycle)
100
t
Control cycle
Silicon controlled rectifier output is commonly 2 to 3 seconds, the
remaining power of the larger equipment dispatch T can reduce the
static error of PID control.
3
Prompt
Name
Description
Factory
value
HT
Unit of time
0: minute 1: hour
0
SC
Ambient
temperature offset
Offset ambient temperature difference
0.00
AL
Alarm setting
Alarm sounds when measured temperature is higher than AL
3.0
CL
Refrigeration
control Setting
Compressor start-stop control available at the time, when the
temperature more than set value + CL and conform to the compressor
refrigeration control delay, the light cooling, refrigeration contact
through, to start the compressor.
0.5
Ct
Compressor delay
Compressor start delay between two adjacent delay time
Ct = 0 indicates no delay
180
Pb
Zero
Adjustment
When the zero error of the controller is bigger, full error is small, adjust
the value, generally Pt100 rarely adjust the value.
0.0
Pk
Full
Adjustment
When the zero error of the controller is lesser, full error is bigger, can
adjust the value. Pk = 4000 x (mercury thermometer reading values -
current temperature measuring points)/current temperature measuring
points
0
HT
Unit of time
0: minute 1: hour
0
8.
ADVANCED SETTINGS
