WEG CFW-11 Programming Manual page 250

PID Regulator [46]
Note!
In the level control case, the setting of the integral gain will depend on the time that it takes for
the reservoir to pass from the minimum acceptable level to the desired level, in the following
conditions:
1. For the direct action the time must be measured with the maximum input flow and the minimum
output flow;
2. For the reverse action the time must be measured with the minimum input flow and the maximum
output flow.
A formula for calculating the P0521 initial value in function of the system response time is presented next:
Where t=time (in seconds).
P0523 – PiD Ramp time
Adjustable
Range:
Proprieties:
Access groups
via HMI:
Description:
This parameter adjusts the ramp time used by the PID regulator function, which will act when it is necessary to
correct the difference between the process variable and the setpoint.
The factory setting time (3.0 s) is normally adequate for the majority of the applications, as those listed in the table
20.3.
P0524 – PiD feedback Selection
Adjustable
Range:
Proprieties:
Access groups
20
via HMI:
20-10
Table 20.3 - Suggestions for PID regulator gain settings
Quantity
Pneumatic system pressure
Pneumatic system flow
Hydraulic system pressure
Hydraulic system flow
Temperature
Level
0.0 to 999.0 s
01 PARAMETER GROUPS
46 PID Regulator
0 = AI1
1 = AI2
2 = AI3
3 = AI4
CFG
01 PARAMETER GROUPS
46 PID Regulator
Gains
Proportional Integral
P0520 P0521
1 0.043
1 0.037
1 0.043
1 0.037
2 0.004
1 See note
P0521=0.02 / t
Differential
P0522
0.000
0.000
0.000
0.000
0.000
0.000
Factory 3.0 s
Setting:
Factory 1
Setting: