ABB ACS880-87LC-4000A/4021A-7, Hardware Manual

Page: 120 / 144

120 Control units of the converter
Layout and connections

BCU layout and connections
Description
I/O I/O terminals (see the following diagram)
SLOT 1 I/O extension, encoder interface or
fieldbus adapter module connection.
(This is the sole location for an FDPI-02
diagnostics and panel interface.)
SLOT 2 I/O extension, encoder interface or
fieldbus adapter module connection
SLOT 3 I/O extension, encoder interface, fieldbus
adapter connection
SLOT 4 RDCO-0x DDCS communication option
module connection
X205 Memory unit connection
BATTERY Holder for real-time clock battery
AI1 Mode selector for analog input AI1
(I = current, U = voltage)
AI2 Mode selector for analog input AI2
(I = current, U = voltage)
D2D TERM Termination switch for drive-to-drive link
(D2D)
DICOM=
DIOGND
Ground selection. Determines whether
DICOM is separated from DIOGND (ie,
the common reference for the digital
inputs floats).
7-segment display
Multicharacter indications are displayed as repeated
sequences of characters
(“U” is indicated briefly before “o”.)
Control program startup in progress
(Flashing) Firmware cannot be started.
Memory unit missing or corrupted
Firmware download from PC to control
unit in progress
At power-up, the display may show short
indications of eg. “1”, “2”, “b” or “U”.
These are normal indications immediately
after power-up. If the display ends up
showing any other value than those
described, it indicates a hardware failure.