ABB ACH550-02-645A-4 [9/32] Conductor cable tie shield wire to agnd x1 31

ABB ACH550-02-645A-4 [9/32] Conductor cable tie shield wire to agnd x1 31
ACH550 BACnet User’s Manual 9
Installation
To reduce noise on the network, terminate the RS485 network using 120 Ω
resistors at both ends of the network. See following diagram and table.
Preferred - three conductors and a shield
Alternate - two conductors and a shield
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
1. 2 Conductor Cable - Tie Shield Wire to AGND: X1-31.
NOTES:
28
29 30 31 32
SCR Screen
B + Positive
A - Negative
AGND
SCR Screen
See Note 2
ACH 550 RS485:
Terminal Block -X1
Building Automation
Controller
G
-
+
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 AGND - Do Not terminate at SCR!
ALTERNATE WIRING:
2 Conductor with Shield

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