Eaton SLX9000 - Figure 9-26: PID Output Curve with the Values of Example 2

SLX9000 Adjustable Frequency Drives User Manual
MN04003020E
For more information visit: www.eaton.com 9-35
January 2009
Figure 9-26: PID Output Curve with the Values of Example 2
Example 2:
Given values:
Par. 2.9.4, P = 100% PID max limit = 100.0%
Par. 2.9.5, I-time = 1.00 s PID min limit = 0.0%
Par. 2.9.6, D-time = 1.00 s Min freq. = 0 Hz
Error value (setpoint - process value) =
±10%
Max freq. = 50 Hz
As the power is switched on, the system detects the difference between the setpoint
and the actual process value and starts to either raise or decrease (in case the error
value is negative) the PID output according to the I-time. Once the difference
between the setpoint and the process value has been reduced to 0, the output is
reduced by the amount corresponding to the value of parameter 2.9.5.
In case the error value is negative, the drive reacts, reducing the output
correspondingly.
D-part
D-part
I-part
I-p
a
rt
Error = 10%
Error = -10%
P-part = 5 Hz
P-part = -5 Hz
D-part
t
Hz
PID Output
Error Value