WEG CFW-09 User Manual page 222

[Factory Setting]
Parameter
P520
PID Proportional
Gain
P521
PID Integral Gain
P522
PID Differential
Gain
P523
PID Ramp Time
0.1 s (< 99.9 s)
(1)
P524
Selection of the
PID Feedback
Range
Unit Description / Notes
Some examples of initial settings of the PID Regulator Gains and PID
0.000 to 7.999
Ramp Times for some applications mentioned in item 6.5.1, are shown
[ 1.000 ]
in table 6.65.
0.001
0.000 to 7.999
[ 0.043 ]
0.001 Pressure pneumatic
system
Flow pneumatic
0.000 to 3.499
system
[ 0.000 ]
Pressure hydraulic
0.001
system
Flow hydraulic
0.0 to 999
system
[ 3.0 ]
Temperature
Level
1 s (> 99.9 s)
The equation to calculate an initial value for P521 (PID Integral Gain) as
a function of the system response time, is presented below:
It selects the feedback input (Process Variable) of the PID regulator:
0 or 1
[ 0 ]
-
CHAPTER 6 - DETAILED PARAMETER DESCRIPTION
Magnitude Proportional
P520
1
1
1
1
2
Refer to note
1
Table 6.65 - Suggestions for gain settings of the PID regulator
NOTES!
(1) For temperature and level control, the action type will depend
on the process. For instance, in the level control, when the
inverter drives the motor that removes fluid from a tank, the action
will be contrary as when the inverter drives the motor that fills a
tank and thus the fluid level increases and the inverter should
increase the motor speed to lower the fluid level, otherwise the
inverter action that drives the pump motor to pump fluid into the
tank will be direct.
(2) In case of level control, the setting of the integral gain will depend
on the time required to fill the tank from the minimum acceptable
level up the desired level, in the following conditions:
I. For the direct action, the time should be measured by
considering the maximum input flow and the minimum output
flow.
II.In the inverse action, the time should be measured by
considering the minimum input flow and the maximum output
flow.
P521 = 0.02 / t
t = time (seconds)
P524
0
1
Table 6.66 - Feedback selection
Gains PIDRamp
Integral Derivative
Time
P521
P522 P523
0.043 0.000
3.0
0.037
0.000
3.0
0.043
0.000 3.0
0.037 0.000
3.0
0.004 0.000
3.0
(2)
0.000 3.0
AIx
AI2 (P237 to P240)
AI3 (P241 to P244)
Action Type
P527
0 = Direct
0 = Direct
0 = Direct
0 = Direct
(1)
Refer to note
(1)
Refer to note
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