WEG CFW-11 Series, Programming Manual

Page: 283 / 307

20-11
20
PID Regulator [46]
Table 20.3 - Suggestions for PID regulator gain settings
Quantity
Gains
Proportional
P0520
Integral
P0521
Differential
P0522
Pneumatic system pressure 1 0.043 0.000
Pneumatic system flow 1 0.037 0.000
Hydraulic system pressure 1 0.043 0.000
Hydraulic system flow 1 0.037 0.000
Temperature 2 0.004 0.000
Level 1 See note 0.000
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:
P0521 = 0.02 / t
Where t = time (in seconds).
P0523 – PID Ramp Time
Adjustable
Range: 0.0 to 999.0 s Factory
Setting: 3.0 s
Properties:
Access groups
via HMI:
01 PARAMETER GROUPS
46 PID Regulator
Description:
This parameter adjusts the ramp time of the setpoint used in the PID regulator function. The ramp prevents abrupt
setpoint transitions to reach the PID regulator.
The factory setting time (3.0 s) is normally adequate for the majority of the applications, as those listed in the Table 20.3
on page 20-11 .
P0524 – PID Feedback Selection
Adjustable
Range: 0 = AI1
1 = AI2
2 = AI3
3 = AI4 Factory
Setting: 1
Properties: CFG
Access groups
via HMI: 01 PARAMETER GROUPS
46 PID Regulator