ABB ACS320 - Page 287

Fieldbus control 287
Preferred Wiring Diagram
Alternate Wiring Diagram
R
Building Automation Controller
ACS320: EIA-485
Terminal Block - X1C
23 24 25 26
SCR Screen B+ Positive A - Negative AGND
+
G
-
PREFERRED WIRING:
4 Conductor with Shield
See note 2: Shield
See note 3: Ground
See note 4: Reference/Common
See note 5
Jumper J701
Notes:
1. Use 4 Conductor cable - 2 twisted pair.
Tie 3rd and 4th wire (2nd pair) to AGND:X1-C26.
2. Tie shield wires together at Drive -
Do not terminate at SCR (Shield)
3. Terminate shield ONLY at “Ground” terminal
in the Building Automation Controller.
4. Terminate AGN wire at “Reference” terminal
in the Building Automation Controller.
5. Set jumper J701 to OFF. See jumper position details on page 55.
BUS termination is an active network.
Pull Up and Pull Down (BIAS) resistors are on board in the ACS320 drive.
R
Building Automation Controller
ACS320: EIA-485
Terminal Block - X1C
23 24 25 26
SCR Screen B+ Positive A - Negative AGND
+
G
-
ALTERNATE WIRING:
2 Conductor with Shield
See note 3: Reference/Common
See note 2
Jumper J701
Notes:
1. 2 Conductor cable - Tie Shield Wires to AGND:X1-C26
Do not terminate at SCR (Shield)
2. Set jumper J701 to OFF. See jumper position details on page 55.
BUS termination is an active network:
Pull Up and Pull Down (BIAS) resistors are on board in the ACS320 drive.
3. Terminate Shield at the “Reference” terminal
in the Building Automation Controller.