Control units of the drive 101
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 Connecting the control cables on page 77.
The following diagram shows the wiring of the drive-to-drive link.
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 Safe torque off function (page
151).
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.
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.
1
2
3
4
B
A
BGND
Shield
XD2D
Termination OFF
1
2
3
4
B
A
BGND
Shield
XD2D
1
2
3
4
B
A
BGND
Shield
XD2D
Termination ONTermination ON
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