ABB ACS880 Series, Firmware Manual

Page: 42 / 764

The process PID setpoint selectors in parameter groups 40 and 41 only have one
setting for the control panel. Whenever the control panel is selected as the setpoint
source, operation resumes using the previous setpoint.
Operating modes of the drive
The drive can operate in several operating modes with different types of reference.
The mode is selectable for each control location (Local, EXT1 and EXT2) in parameter
group
19 .
The following is a general representation of the reference types and control chains.
For detailed diagrams, see chapter Control chain diagrams .
Speed reference
source selection I
Speed reference
source selection II
Speed reference
ramping and
shaping
Speed error
calculation
Motor feedback
configuration
Torque reference
source selection
and modification
Speed controller
Load feedback and
position counter
configuration
Operating mode
selection
Torque
controller
DTC motor
control mode
Scalar motor
control mode
Reference
selection for
torque controller
Torque limitation
Process PID setpoint
and feedback source
selection
Process PID
controller
Frequency reference
source selection
and modification
Frequency
reference
modification
￭ Speed control mode
The motor follows a speed reference given to the drive. This mode can be used
either with estimated speed as feedback, or with an encoder or resolver for better
speed control accuracy.
Speed control mode is available in both local and external control. It is also available
both in DTC (Direct Torque Control) and scalar motor control modes.
42 Control locations and operating modes