Embedded Fieldbus (Efb) - ABB ACH550-01 User Manual

Embedded fieldbus (EFB)

To reduce noise on the network, terminate the RS485 network
using 120 ohm resistors at both ends of the network. See the
diagram below.
Terminated
station Station
Use preferably three conductors and a shield for the connection.
ACH 550 RS485:
See
Note 1
See Note 2
Notes:
S:
1. Set switch J2 to OFF. ON position would make
e 3 Conductor Cable - Tie 3rd Wire to AGND: X1-31.
the network active (pull up & pull down [BIAS]
switch J2 to OFF. BUS termination is an active network:
l Up & Pull Down (BIAS) resistors are on board the ACH550 Drive!
resistors are on board the drive).
shield wires together at Drive -
2. Tie shield wires together at the drive – Do
Not terminate at SCR!
NOT terminate at SCR.
minate shield ONLY at "Ground" terminal
he Building Automation Controller!
3. Terminate shield ONLY at the "Ground"
minate AGN wire at "Reference" terminal
he Building Automation Controller!
terminal in the building automation controller.
4. Terminate AGND wire at the "Reference"
terminal in the building automation controller.
Setting up communication through EFB
Before configuring the drive for fieldbus control, the drive must
be connected to the fieldbus according to the instructions given
in this manual and manuals Embedded Fieldbus (EFB) Control
142
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Station
ACH550 RS485:
Terminal block X1
Terminal Block -X1
28 29 30
See Note 2: Shield
See Note 3: Shield
ACH550-01 User's Manual
31 32
PREFERRED WIRING:
3 Conductor with Shield
See Note 3:
See Note 4: Ground
Ground
See Note 5: Reference/Common
See Note 4: Reference/
Common
Building Automation
Building automation
Controller
controller
Serial communications
Terminated
station
-
G R +