Appendix G
PID Set Up
PID Loop
The PowerFlex 40P has a built-in PID (proportional, integral,
differential) control loop. The PID loop is used to maintain a process
feedback (such as pressure, flow or tension) at a desired set point. The
PID loop works by subtracting the PID feedback from a reference and
generating an error value. The PID loop reacts to the error, based on the
PID Gains, and outputs a frequency to try to reduce the error value to 0.
To enable the PID loop, parameter A132
[PID Ref Sel] must be set to an
option other than 0 “PID Disabled”.
Exclusive Control and Trim Control are two basic configurations where
the PID loop may be used.
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