External Power Supply For The Control Unit (Xpow); Drive-To-Drive Link (Xd2D); Sdhc Memory Card Slot - ABB ACS880-207 Hardware Manual

136 The control unit

External power supply for the control unit (XPOW)


The BCU must be powered from a 24 V DC, 2 A power supply. The power supply is
connected to terminal block XPOW. A second supply can be connected to the same
terminal block for redundancy.

Drive-to-drive link (XD2D)


The drive-to-drive link is a daisy-chained RS-485 transmission line that allows basic
master/follower communication with one master drive and multiple followers.
Enable bus termination on the IGBT supply unit at the ends of the drive-to-drive link. On
intermediate IGBT supply unit, disable bus termination. The settings for BCU-x2 control
unit are:
Switch
Settings
designation
ON = Termination enabled.
D2D.TERM
OFF = Termination disabled.
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

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 for the supply unit
Termination OFF
on page 55.
Termination ON