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The contents below are for reference and advanced applications. Most
users do not need to read beyond this point.
2.2 PID parameter setting (accessed by code 0036)
The values of P, I and D parameters are critical for good response time,
accuracy and stability of the system. The values of the PID parameters
have been optimized for hot runner coil heater. User should not change it
unless the result is not satisfactory.
Setting PID parameters is similar to the setting of the Temperature and
Alarm Parameter as shown in the flow chart of Figure 1. The difference is
that these parameters are accessed by enter code 0036 instead of 0001.
Table 2. PID and relevant parameters
Symbol
Description
p
Proportional Constant
P
I
I
Integral Constant
d
d
Derivative Constant
souf
SouF
Damp Constant
ot
Cycle Rate
ot
FILt
Digital Filter Strength
file
End
Exit
END
Note 3. Proportional Constant (P): When P increases, the system is
more stable. When P decreases, the system is less stable. If the P is too
small, the system would be oscillatory or even non-convergent.
Note 4. Integral time (I): Brings the system up to the set value by adding
a constant to the output that is proportional to how far the process value
(PV) is from the set value (SV) and how long it has been there. When I
decreases, the response speed is faster but the system is less stable.
When I increases, the respond speed is slower, but the system is more
stable. When I is 0, then it turns to be PD control.
Note 5. Derivative time (d): Responds to the rate of PV change, so that
the controller can compensate in advance before |SV-PV| gets too big. A
larger number increases its action. Setting d-value too small or too large
would decrease system stability, cause oscillation or even non-
convergence.
Note 6. Damp constant (SouF): The parameter is controlled by the
artificial intelligence of the controller. This constant helps the PID control
quality. When its value is too high, the system will be over damped.
When its value is too low, the system may overshoot.
SouF too low
Figure 4. Damp constant
Note 7. Cycle rate (ot): It is the time period that the controller uses to
calculate its output. The initial value is set to 2. Short time causes the fan
to pulse at higher frequency. Longer time may reduce the quality of
control.
Note 8. Digital Filter (Filt): can be set as 0, 1, 2, 3. Filt=0, filter disabled;
Filt=3, strongest filtering effect. Stronger filtering increases the stability of
readout display, but causes more delay in the response to changes in
temperature.
2015.05
Range
Initial
0.1~99.9(%)
2.0
2~1999(Sec)
40
0-399(Sec)
10
0.1~1.0
0.4
2~199(Sec)
002
0~3
0
SouF too high
SouF acceptable
2.3 System Configuration Parameters (accessed by code 0089)
Table 3. System configuration parameter setting
Symbol
Inty
Inty
Outy
Outy
Hy
hy
adtu
Adtu
psb
Psb
rd
Rd
Corf
corf
End
end
Note
Note 3
Note 4
Operation Mode
SET
XXXX
Note 5
Note 6
Note 7
Note 8
Note 9. Display unit selection CorF: 0 for Celsius (° C); 1 for Fahrenheit
(° F). By default, CorF is set to 1 (Fahrenheit). For Celsius display, you
need to set CorF to 0 and divide your original P value by 1.8.
For example, assuming your original P value is 2.0. To change to Celsius
display, you need to set CorF=0 and P = 1.1 (2.0/1.8=1.11).
E-mail: [email protected] Tel: 770-569-8420
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Description
Range
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Display Unit
0: ° C 1:° F
Exit
Parameter Display
Enter Code
SET
0089
inty
SET
outy
SET
HY
SET
atdu
SET
psb
SET
rd
SET
corf
SET
end
Figure 5. The system setup flow chart
Auber Instruments Inc.
5755 North Point Parkway, Suite 99,
Alpharetta, GA 30022
www.auberins.com
Initial
Note
K
2
3
10
0
0
1
Note 9
SET
X
SET
XXXX
SET
X
SET
XXXX
SET
X
Display Unit(C/F)
SET
X
P2/2