Application Control - ABB ACS380 Firmware Manual

ACS380 FW.book Page 81 Friday, May 4, 2018 4:18 PM
Speed compensation can be restricted to forward or reverse rotating direction. Speed
compensation is supported in both vector and scalar motor control.
Settings
Parameters 21.30 Speed compensated stop mode
compensated stop delay
177).

Application control


Control macros
Control macros are predefined parameter edits and I/O configurations. See chapter
Control macros.

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.
AI1
AI2
• • •
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
external control locations
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(page 177) and 21.32 Speed comp stop threshold
Setpoint
Process
Filter
Process
actual
values
on page 52.
Program features
(page 176), 21.31 Speed
Limitation
Speed, torque or
frequency
PID
reference chain
40.57 PID set1/set2 selection.
81
(page
Local and