Operational Characteristics - ABB FSO-21 User Manual

40 Overview
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Operational characteristics

The FSO module monitors that the drive operates within the configured operating
limits, and if the limits are exceeded, activates a safe stopping in the drive within the
response time. The safe stopping function activates the drive STO function either
immediately or after an emergency ramp. Activation of the drive STO function
removes the torque and, if configured, applies the brake.
WARNING! The Safe torque off function does not disconnect the voltage of the
main and auxiliary circuits from the drive. See the warning on page 34.
Prevention of unexpected start-up is also handled by the FSO module.
The supported functions are preprogrammed in the FSO firmware; they cannot be
programmed in any way.
Authorized personnel configure the FSO module with the Drive composer pro PC
tool. The FSO checks the authorization with a password before it is possible to edit
the FSO parameters. The user sends parameters from the tool to the drive, and after
the tool has displayed the CRC values of the parameters, the user must validate the
feedback values.
The FSO module goes into the Fail-safe mode if it detects an internal fault during its
diagnostics tests (see section
You must reboot the FSO module after the drive has recovered from a power failure,
normally by switching the power off and on. It is also possible to reboot the FSO with
drive parameter 96.09 FSO reboot or by pressing the Boot FSO button on the Safety
view of the Drive composer pro PC tool. The FSO accepts this 'soft boot' only if it is in
the Fail-safe mode and the motor is stopped.
FSO modes on page 53).