ABB ACS880 ESP, Firmware Manual

Page: 53 / 494

Standard programposi features 53

External control
When the drive is in external control, control commands are given through the
• I/O terminals (digital and analog inputs), or optional I/O extension modules
• embedded fieldbus interface or an optional fieldbus adapter module.
Two external control locations, EXT1 and EXT2 are available. The user can select the
sources of start and stop commands separately for each location using parameters
20.01 ... 20.10 . Select the operating mode separately for each location (in parameter
group 19 Operation mode ), which enables quick switching between different
operating modes. For example, speed control. Selection between EXT1 and EXT2 is
done through any binary source such as a digital input or fieldbus control word (see
parameter
19.11 Ext1/Ext2 selection (page 178 ). The source of reference is
selectable for each operating mode separately.
Operating modes of the drive
The drive operates 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 Operation mode .
The following is a general representation of the reference types and control chains.
The page numbers refer to detailed diagrams in chapter
Control chain diagrams .
Motor feedback
configuration
(p 480 )
Speed
reference
source selection
I
(p 477 )
Speed controller
(p 483 )
Speed reference
source selection
II
(p 478 )
Speed reference
ramping and
shaping
(p 479 )
Speed error
calculation
(p 482 )
Frequency
reference
source selection
and modification
(pp 484 … 485 )
DTC motor
control mode
Scalar motor
control mode
Torque limitation