WEG CFW700, Programming And Troubleshooting Manual

Page: 203 / 223

Applications
19
CFW700 | 19-13
Table 19.2: Recommended settings for the PID regulator gains
Variable
Gains
Proportional
P1020
Integral
P1021
Derivative
P1022
Pneumatic system pressure 1 0.430 0.000
Pneumatic system flow 1 0.370 0.000
Hydraulic system pressure 1 0.430 0.000
Hydraulic system flow 1 0.370 0.000
Temperature 2 0.040 0.000
Level 1 See note below 0.000
NOTE!
For the level control, the integral gain settings will depend on the time it takes for the reservoir to go
through the minimum acceptable level to the desired level, with the following conditions:
1. The time for the direct action should be measured with the maximum input flow and minimum
output flow.
2. The time for the reverse action should be measured with minimum input flow and maximum
output flow.
An equation to calculate the initial value of P1021 as a function of the system response time is presented next:
P1021=0.50 / t,
Where: t=time (in seconds).
P1023 – PID Setpoint Filter
Adjustable
Range:
0.00 to 650.00 s
Factory
Setting:
0.25 s
Properties:
Access groups
via HMI:
SPLC
Description:
This parameter sets the value of the constant time of the setpoint filter of the PID regulator and has the purpose
of reducing abrupt changes in the PID setpoint value.
P1024 – PID Regulator Action Type
Adjustable
Range:
0 = Direct
1 = Reverse Factory
Setting:
0
Properties:
Access groups
via HMI:
SPLC
Description:
The PID action type should be selected as “Direct” when it is necessary that the motor speed is increased in
order to increment the process variable. Otherwise, the “Reverse” should be selected.