ABB ACH550-01 User Manual page 279

ACH550-01 User's Manual
Overview of PID controllers
PID controller – Basic set-up
In PID control mode, the drive compares a reference signal
(setpoint) to an actual signal (feedback), and automatically
adjusts the speed of the drive to match the two signals. The
difference between the two signals is the error (deviation) value.
Typically PID control mode is used when the speed of a fan or
pump needs to be controlled based on pressure, flow or
temperature. In most cases – when there is only 1 transducer
signal wired to the ACH550 – only parameter Group 40:
PROCESS PID SET 1 is needed.
A schematic of setpoint/feedback signal flow using parameter
group 40 is presented on page 275.
274 Parameter listing and descriptions
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