ABB ACS880-304 +A018, Hardware Manual

Page: 233 / 280

Control unit 233
The table above shows the control connections of the unit, and the default meaning or use
of the signals in the control program. Most I/O connections are reserved for the internal
use of the supply unit.
Wire sizes and tightening torques: 0.5 … 2.5 mm
2
(24…12 AWG) and 0.5 N·m (5 lbf·in) for
both stranded and solid wiring.
There are additional fiber optics connections from the BCU control unit to the supply
modules.
Notes:
1)
Use of the signal in the control program. The use is fixed and it cannot be changed by a parameter.
2)
Default use of the signal in the control program. The use can be changed by a parameter. For the delivery-
specific use, see the delivery-specific circuit diagrams.
3)
Current [0(4)…20 mA, R
in
> 100 ohm] or voltage [0(2)…10 V, R
in
> 200 kohm] input selected by switch AI1.
Change of setting requires reboot of control unit.
4)
Current [0(4)…20 mA, R
in
> 100 ohm] or voltage [0(2)…10 V, R
in
> 200 kohm] input selected by switch AI2.
Change of setting requires reboot of control unit.
5)
Must be set to ON when the unit is the first or last unit on the drive-to-drive (D2D) link.
6)
Total load capacity of these outputs is 4.8 W (200 mA at 24 V) minus the power taken by DIO1 and DIO2.
7)
Determines whether DICOM is separated from DIOGND (ie. common reference for digital inputs floats).
DICOM = DIOGND ON: DICOM connected to DIOGND. OFF: DICOM and DIOGND separate. See section
Ground isolation diagram on page 238 .
8)
The Safe torque off (STO) function is only implemented in the inverter units. When the control board is used
in the rectifier/supply or brake unit, de-energizing IN1 or IN2 of XSTO connector only stops the operation of the
rectifier/supply or brake unit. This stopping is not safety-related and cannot be used in safety purposes.

SDHC memory card slot
The BCU-x2 has an on-board data logger that collects real-time data from the converter 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.

External power supply for the control unit (XPOW)
Ex24 V, 2 A power supply for the control unit can be connected to terminal block
XPOW. You can take the power supply from the supply module or another power source.
Using power source other than the supply module is recommended if
•
the control board needs to be kept operational during input power breaks, for example,
due to uninterrupted fieldbus communication, or
•
immediate restart is needed after power breaks (that is, no control board power up
delay is allowed).
See also the firmware manual parameter 195.04.