Auber Instruments SYL-1512A Руководство по эксплуатации - Страница 4
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flow chart is similar to Fig. 3
Symbol
P
I
d
SouF
ot
FILT
End
The values of the P, I, and D parameters are critical for good response time, accuracy and stability of
the system. Using the Auto-Tune function to automatically determine these parameters is recommended for
the first time user. If the auto tuning result is not satisfactory, you can manually fine-tune the PID constants
for improved performance.
Note 4. Proportional Constant (P): Represents the gain of the signal amplifier. Larger gain means the
controller will have more output power change for the same difference between set temperature (SV) and
measured temperature (PV). Smaller P value represents higher gain, or faster action.
Note 5. Integration 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, response speed is faster but the system is less stable. When I increases, respond speed is
slower, but system is more stable.
Note 6. Differentiation time (d): Responds to the rate of change of the process value 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, causing oscillation or even
non-convergence.
Note 7. Damp constant: This constant can help the PID control further improve the control quality. It helps
to damp the temperature overshoot. When its value is too low, the system might overshoot. When it is too
high, the system will be over damped.
Note 8. Control Period (also called cycle rate) (ot): When ot gets smaller, heating/cooling cycle is drive
faster, system respond speed is faster. For SSR output, ot is normally set at 2. But when using contact
control (Relays), contacts wear out faster so it is normally at 5~30 seconds.
Note 9. Digital Filtering (Filt): Filt=0, filter disabled; Filt=1, weak filtering effect; Filt=3, strongest
filtering effect. Stronger filtering increases the stability of the readout display, but causes more delay in the
response to changes in temperature.
c) Temperature setting and Alarm setting
To enter the temperature and alarm parameter setting mode, press
Table 3, PID and relevant parameters
Description
Setting range
Proportional
0.1～99.9 (%)
Constant
Integral time
2～1999(Sec)
Derivative time
0～399(Sec)
Damp constant
0.1～1.0
Cycle rate
2～199(sec)
Digital
filter
0～3
strength
Exit
4
Initial Setting
5.0
100
20
0.2
2
0
, enter the code "0001", and press
note
4
5
6
7
8
9