AUBER INSTRUMENTS
WWW.AUBERINS.COM
2015.05
P2/2
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
Range
Initial
Note
P
p
Proportional Constant
0.1~99.9(%)
2.0
Note 3
I
I
Integral Constant
2~1999(Sec)
40
Note 4
d
d
Derivative Constant
0-399(Sec)
10
Note 5
souf
SouF
Damp Constant
0.1~1.0
0.4
Note 6
ot
ot
Cycle Rate
2~199(Sec)
002
Note 7
file
FILt
Digital Filter Strength
0~3
0
Note 8
END
End
Exit
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
SouF acceptable
SouF too high
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.
2.3 System Configuration Parameters (accessed by code 0089)
Table 3. System configuration parameter setting
Symbol
Description
Range
Initial
Note
Inty
Inty
Not applicable
K
Outy
Outy
Not applicable
2
hy
Hy
Not applicable
3
adtu
Adtu
Not applicable
10
psb
Psb
Not applicable
0
rd
Rd
Not applicable
0
corf
Corf
Display Unit
0: ° C 1:° F
1
Note 9
end
End
Exit
Operation Mode
0089
Enter Code
Parameter Display
inty
X
XXXX
X
XXXX
outy
atdu
psb
SET
SET
SET
SET
SET
SET
SET
X
rd
SET
X
corf
Display Unit(C/F)
end
SET
SET
SET
SET
SET
XXXX
HY
SET
SET
Figure 5. The system setup flow chart
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).
Auber Instruments Inc.
5755 North Point Parkway, Suite 99,
Alpharetta, GA 30022
www.auberins.com
E-mail: [email protected] Tel: 770-569-8420
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