ABB ACS850 series, Firmware Manual

Page: 31 / 260

Program features 31
Constant speeds
It is possible to predefine up to 7 constant speeds. Constant speeds can be activated,
for example, through digital inputs. Constant speeds override the speed reference.
Settings
Parameter group 26 Constant speeds (page 137 ).
Critical speeds
A Critical speeds function is available for applications where it is necessary to avoid
certain motor speeds or speed ranges because of, for example, mechanical
resonance problems.
Settings
Parameter group 25 Critical speed (page 136 ).
Drive-to-drive link
The drive-to-drive link is a daisy-chained RS-485 transmission line that allows basic
master/follower communication with one master drive and multiple followers.
The wiring of the drive-to-drive link is presented in the hardware manual of the drive.
Settings
Parameter group 57 D2D communication (page 186 ).
Emergency stop
Note: The user is responsible for installing the emergency stop devices and all the
additional devices needed for the emergency stop to fulfil the required emergency
stop category classes. For more information, contact your local ABB representative.
The emergency stop signal is to be connected to the digital input which is selected as
the source for the emergency stop activation (par.
10.13 Em stop off3 or 10.15 Em
stop off1 ). Emergency stop can also be activated through fieldbus ( 02.22 FBA main
cw ).
Note: When an emergency stop signal is detected, the emergency stop function
cannot be cancelled even though the signal is cancelled.
Encoder support
The program offers support for two encoders (or resolvers), encoder 1 and 2.
Multiturn encoders are supported only as encoder 1. Three optional interface
modules are available: