ABB ACS880-107 Hardware Manual page 62

62 The inverter control unit
Ground isolation diagram (BCU)
+24VI
GND
+24VI
GND
+VREF
-VREF
AGND
AI1+
AI1-
AI2+
AI2-
AO1
AGND
AO2
AGND
B
A
BGND
SHIELD
XRO1, XRO2, XRO3
NC
COM
NO
NC
COM
NO
NC
COM
NO
+24VD
DICOM
+24VD
DIOGND
DIO1
DIO2
DIOGND
DIOGND
DI1
DI2
DI3
DI4
DI5
DI6
DIIL
OUT
SGND
IN1
IN2
XSTO OUT
IN1
SGND
IN2
SGND
DICOM=DIOGND: ON
All digital inputs share a common ground (DICOM connected to DIOGND). This is the default setting.
DICOM=DIOGND: OFF
Ground of digital inputs DI1...DI5 and DIIL (DICOM) is isolated from DIO signal ground (DIOGND).
Isolation voltage 50 V.
XPOW
1
2
3
4
XAI
1
2
3
4
Common mode voltage between
5
each AI input and AGND is
6
7 +30 V
XAO
1
2
3
4
XD2D
1
2
3
4
11
12
13
21
22
23
31
32
33
XD24
5
6
7
8
XDIO
1
2
3
4
XDI
*
1
2
3
4
5
6
7
XSTO
1
2
3
4
5
6
7
8
*Ground selector (DICOM=DIOGND) settings
Ground