ABB ACQ580 Firmware Manual page 63

Program features 59
Tracking
In tracking mode, the PID block output is set directly to the value of parameter 40.50
(or 41.50) Set 1 tracking ref selection. The internal I term of the PID controller is set
so that no transient is allowed to pass on to the output, so when the tracking mode is
left, normal process control operation can be resumed without a significant bump.
Settings
• Parameter groups 40 Process PID set 1 (page 213) and 41 Process PID set 2
(page 229).