346 Control units of the drive
Safe torque off (XSTO, XSTO OUT)
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.
The XSTO OUT connector on BCU-x2 control units 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.
For information on the implementation of a Safe torque off function, see chapter The Safe
torque off function.
FSO-xx safety functions module connection (X12)
See ACS880 multidrive cabinets and modules electrical planning instructions
(3AUA0000102324 [English]), and the user manual of the FSO-xx module.
SDHC memory card slot
The BCU-x2 has an on-board data logger that collects real-time data from the 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.
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