Safe Torque Off (Xsto, Xsto Out); Fso-Xx Safety Functions Module Connection (X12); Sdhc Memory Card Slot - ABB ACS880-37 Hardware Manual

138 Control units of the drive
Use shielded twisted-pair cable (~100 ohm, for example, PROFIBUS-compatible cable) for
the wiring. For best immunity, high quality cable is recommended. Keep the cable as short
as possible; the maximum length of the link is 50 meters (164 ft). Avoid unnecessary loops
and running the cable near power cables (such as motor cables). Ground the cable shields
as described in section
The following diagram shows the wiring of the drive-to-drive link.
Termination ON

Safe torque off (XSTO, XSTO OUT)


On the inverter control unit [A41], the XSTO input can be used to implement a safe torque
off (STO) function. For the drive to start, both connections (OUT1 to IN1 and IN2) must be
closed. By default, the terminal block has jumpers to close the circuit. Remove the jumpers
before connecting an external Safe torque off circuit to the drive. For information on the
implementation of a Safe torque off function, see chapter
(page 237).
Note: The XSTO input only acts as a true Safe torque off input on the inverter control unit
[A41]. De-energizing the IN1 and/or IN2 terminals on the supply control unit [A51] will stop
the supply unit but not constitute a true safety function.
The XSTO OUT connector is wired to the STO IN connector of one inverter module. In
case the inverter unit consists of multiple modules, the STO OUT connector of one module
is wired to the STO IN connector of the next module etc. so that all modules are part of the
chain.

FSO-xx safety functions module connection (X12)


See section Implementing the functions provided by the FSO-xx safety functions module
(option +Q972 or +Q973)

SDHC memory card slot


The BCU-x2 has an on-board data logger that collects real-time data from the power
modules to help fault tracing and analysis. The data is stored onto the SDHC memory card
inserted into the SD CARD slot and can be analyzed by ABB service personnel.
Connecting the control cables
Termination OFF
(page 90), and the user manual of the FSO-xx module.
(page 99).
Termination ON
The Safe torque off function