WEG CFW500 V1.8X, Руководство по программированию, Страница: 140 / 172

PID Controller
13-8 | CFW500
13
P0520 – PID Proportional Gain
P0521 – PID Integral Gain
P0522 – PID Differential Gain
Adjustable
Range:
0.000 to 9.999 Factory
Setting:
P0520 = 1.000
P0521 = 0.430
P0522 = 0.000
Properties:
Access Groups
via HMI:
Description:
These parameters define the proportional, integral and differential gains of the function PID Controller and must
be set according to the application which is being controlled.
Some examples of initial settings for some applications are presented in Table 13.2 on page 13-8 .
Table 13.2: Suggestion for setting the PID controller gains
Magnitude
Gains
Proportional
P0520
Integral
P0521
Differential
P0522
Pressure in pneumatic system. 1.000 0.430 0.000
Flow in pneumatic system. 1.000 0.370 0.000
Pressure in hydraulic system. 1.000 0.430 0.000
Flow in hydraulic system. 1.000 0.370 0.000
Temperature. 2.000 0.040 0.000
Level. 1.000 Read the next note. 0.000
NOTE!
In the case of the level control, the setting of the integral gain will depend on the time it takes the tank
to go from the minimum acceptable level to the desired level in the following conditions:
„
For direct action, the time must be measured with the maximum input flow and minimum output
flow.
„
For reverse action, the time must be measured with the minimum input flow and maximum output
flow.
The formula to calculate the initial value of P0521 considering the system response time is presented below:
P0521 = 0.5 / t,
Where: t = time (in seconds).
P0525 – PID Setpoint by HMI
Adjustable
Range:
0.0 to 100.0 % Factory
Setting:
0.0 %
Properties:
Access Groups
via HMI: