ABB ACS880 Series, Firmware Manual

Page: 109 / 764

Application control
￭ Application macros
Application macros are predefined application parameter edits and I/O
configurations. See chapter
Application macros (page 149) .
￭
Process PID control
There is a built-in process PID controller in the drive. The controller can be used
to control process variables such as pressure, flow or fluid level.
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).
Process PID control operates on a 2 ms time level.
The simplified block diagram below illustrates the process PID control. For a more
detailed block diagram, see page
758 .
Setpoint
AI1
AI2
D2D
FBA
Process
actual
values
Filter
Limitation
Process
PID
. . .
Speed, torque or
frequency
reference chain
The control program contains two complete sets of process PID controller settings
that can be alternated whenever necessary; see parameter
40.57 .
Note: Process PID control is only available in external control; see section Local
control vs. external control (page 39) .
Quick configuration of the process PID controller
1. Activate the process PID controller (parameter 40.7 ).
2. Select a feedback source (parameters 40.8 … 40.11 ).
3. Select a setpoint source (parameters 40.16 … 40.25 ).
Program features 109