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66 Program features
Application control
Application macros
Application macros are predefined application parameter edits and I/O configurations.
See chapter
).
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
.
The control program 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
(page
Process
PID
AI1
Process
actual
values
AI2
• • •
D2D
FBA
Setpoint
Speed, torque or
frequency
reference chain
Filter
Limitation
Summary of Contents for ACS880-x04
Page 1: ... ABB INDUSTRIAL DRIVES ACS880 primary control program Firmware manual ...
Page 4: ......
Page 18: ...18 Using the control panel ...
Page 24: ...24 Control locations and operating modes ...
Page 112: ...112 Application macros ...
Page 496: ...496 Additional parameter data ...
Page 544: ...544 Fault tracing ...
Page 602: ...602 Control chain diagrams ...