ABB ACH580 Series - Page 87

78 ACH580 E-Clipse bypass and packaged drive user manual
Embedded fieldbus
Preferred wiring diagram
Alternate wiring diagram
NOTES:
1. Use 3 Conductor Cable - 1 twisted triplet. Tie 3rd wire to AGND:
X2-29.
2. Tie shield wires together at Drive - Do Not terminate at SCR.
3. Terminate shield ONLY at “Ground” terminal in the Building
Automation Controller.
4. Terminate AGND wire at “Reference” terminal in the Building
Automation Controller.
5. The transceiver in the E-Clipse bypass is a 1/8th load device. Only
255 ACH550 drives with E-Clipse bypass may be connected to a
given EIA-485 segment without repeaters. Network biasing is
required per ANSI / ASHRAE Standard 135.
See Note 4: Reference/Common
Building Automation
Controller
ABB E-CLIPSE BYPASS RS485:
Terminal Block: X2
ON
SCR Screen B + Positive
A - Negative AGND
SCR Screen
Required Wiring:
ANSI/ASHRAE Standard 135
(Twisted Pair and Reference
with Isolated Devices)
See Note 5
26 27
28 29 30
G
R
–
+
See Note 3: Ground
ON ON
See Note 2: Shield
NOTES:
1. Use 2 Conductor Cable - 2 twisted pair w/shield.
Tie 3rd & 4th wire (2nd pair) to AGND: X2-29.
2. Terminate shield at “Reference” terminal
in the Building Automation Controller!
See Note 2: Reference/Common
Building Automation
Controller
ABB E-CLIPSE BYPASS RS485:
Terminal Block: X2
ON ON
SCR Screen B + Positive
A - Negative AGND
SCR Screen
ALTERNATE WIRING:
4 Conductor with Shield
26 27 28
G
29 30
R
+
-