ABB ACS180, Hardware Manual, Page: 72 / 168

Additional information on the control connections
￭ Connecting EIA-485 fieldbus cable to the drive
Connect the fieldbus to the EIA-485 Modbus RTU terminal on the front of the drive.
The EIA-485 network uses shielded, twisted-pair cable for data signaling with
characteristic impedance between 100 and 130 ohm. The distributed capacitance
between conductors is less than 100 pF per meter (30 pF per foot). Distributed
capacitance between conductors and shield is less than 200 pF per meter (60 pF
per foot). Foil or braided shields are acceptable. The connection diagram is shown
below.
With signal ground reference terminal
G R - +
1
B+
A-
AGND Shield
J1
J2
4
B+
A-
AGND Shield
J1
J2
3
B+
A-
AGND Shield
J1
J2
2
Without signal ground reference terminal
G - +
1
100 ohm
B+
A-
AGND Shield
J1
J2
4
B+
A-
AGND Shield
J1
J2
3
B+
A-
AGND Shield
J1
J2
2
Fieldbus controller. Termination ON
1)
.
1
Drive. J1: Termination OFF; J2: Modbus Mode 2
Drive. J1: Termination OFF; J2: Modbus Mode 3
Drive at the end of the communication line. J1: Termination ON
1)
; J2: Modbus
Mode
4
1) Note: The device at both ends on the fieldbus must have termination set to ON.
72 Electrical installation