The diagram that follows shows the wiring of the drive-to-drive link. The diagram is
applicable to these control units:
• BCU-02/12/22
• UCU-22…24
XD2D
XD2D
XD2D
1
2
3
4
B
A
BGND
SHIELD
1
2
3
4
B
A
BGND
SHIELD
1
2
3
4
B
A
BGND
SHIELD
Termination ON Termination ONTermination OFF
￭
Safe torque off (XSTO, XSTO OUT)
See chapter The Safe torque off function (page 307).
Note: The XSTO input only acts as a true Safe torque off input on the inverter control
unit. De-energizing the STO input terminals of other units (supply, DC/DC converter,
or brake unit) will stop the unit but not constitute a SIL/PL classified safety function.
￭
FSO safety functions module connection (X12, with BCU only)
Refer to the applicable FSO module user's manual.
Note: Control units that have a sticker with the text “No FSO support” are not
compatible with the FSO safety functions module.
￭
SDHC memory card slot
The BCU control unit 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.
￭
MicroSDHC memory card slot
The UCU-22…24 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
microSDHC memory card inserted into the UMU memory unit and can be analyzed by
ABB service personnel.
164 Control units of the drive
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