Application Control; Control Macros; Process Pid Control - ABB ACS580 Firmware Manual

Application control



Control macros

Control macros are predefined parameter edits and I/O configurations. See chapter
Control macros (page 59).


Process PID control

There is a built-in process PID controller in the drive. The controller can be used to
control process such as pressure or flow in the pipe or fluid level in the container.
In process PID control, a process reference (setpoint) is connected to the drive
instead of a speed reference. An actual value (process feedback) is also brought
back to the drive. The process PID control adjusts the drive speed in order to keep
the measured process quantity (actual value) at the desired level (setpoint). This
means that user does not need to set a frequency/speed/torque reference to the drive
but the drive adjust its operation according to the process PID.
The simplified block diagram below illustrates the process PID control. For more
detailed block diagrams, see pages
Setpoint
AI1
Process
AI2
actual
• • • values
FBA
The drive contains two complete sets of process PID controller settings that can be
alternated whenever necessary; see parameter
Note: Process PID control is only available in external control; see section
control vs. external control
430 and 431.
Process
Filter
PID
(page 86).
Program features 111
Limitation
40.57 PID set1/set2
Speed, torque or
frequency
reference chain
selection.
Local