
ACS550-01/U1 User’s Manual 201
Embedded fieldbus
• To reduce noise on the network, terminate the RS485 network using 120 Ω
resistors at both ends of the network. Use the DIP switch to connect or disconnect
the termination resistors. See the following diagram.
• For configuration information see the following sections:
– Communication set-up – EFB on page 201
– Activate drive control functions – EFB on page 203
– The appropriate EFB protocol specific technical data. For example, Modbus
protocol technical data on page 211.
Communication set-up – EFB
Serial communication selection
To activate the serial communication, set parameter 9802
COMM PROT SEL =
1(
STD MODBUS).
Note: If you cannot see the desired selection on the panel, your drive does not have
that protocol software in the application memory.
Terminated Terminated
station
Station Station
station
1. Use 3 Conductor Cable - Tie 3rd Wire to AGND: X1-31.
NOTES:
28
29 30
31 32
SCR Screen
B + Positive
A - Negative
AGND
SCR Screen
See Note 3: Shield
See Note 2
ACH 550 RS485:
Terminal Block -X1
Building Automation
Controller
G
-
+R
See Note 4: Ground
4. Terminate shield ONLY at "Ground" terminal
in the Building Automation Controller!
5. Terminate AGN wire at "Reference" terminal
in the Building Automation Controller!
2. Set switch J2 to OFF. BUS termination is an active network:
Pull Up & Pull Down (BIAS) resistors are on board the ACH550 Drive!
3. Tie shield wires together at Drive -
Do Not terminate at SCR!
See Note 5: Reference/Common
PREFERRED WIRING:
3 Conductor with Shield
Notes:
1. Set switch J2 to OFF. ON position would make the
network active (pull up & pull down [BIAS] resistors
are on board the drive).
2. Tie shield wires together at the drive – Do NOT
terminate at SCR.
3. Terminate the shield ONLY at the “Ground” terminal
in the controller.
4. Terminate the AGND wire at the “Reference”
terminal in the controller.
See
Note 1
SCR Screen
SCR Screen
B + Positive
A - Negative
AGND
Drive RS485:
Terminal block X1
Controller
See Note 2: Shield
See Note 3:
Ground
See Note 4: Reference/
Common
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