ABB ACH550-UH User Manual

2-84 ACH550 E-Clipse Bypass User’s Manual
Embedded fieldbus
Preferred wiring diagram
Alternate wiring diagram
NOTES:
26
27 28
29 30
SCR Screen B + Positive A - Negative AGND SCR Screen
See Note 2: Shield
G
-
ABB
E
-CLIPSE BYPASS RS485:
Terminal Block:
X
2
Building Automati
on
Controller
+
R
SeeNote3:Ground
See Note 4: Reference/Co
m
mon
O
N
O
N
O
N
1. Use3ConductorCable-1twistedtriplet.Tie3rdwiretoAGND:
X2-29.
2. Tie shield wires together at Drive - Do Not terminate at SCR.
3. Terminate shield ONLY at "Ground" terminal in the
Buil
di
n
g
Automation Controller.
4. Terminate AGND wire at "Reference" terminal in the Buildi
ng
Automation Contro
ller.
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 repeater
s. Network biasing is
required per ANSI / ASHRAE Standard 135.
R
equ
ired Wiring:
A
N
SI/ASHRAE Standard 13
5
(TwistedPa
i
r and Reference
with Iso
l
ated Devices)
Se
e
Note 5

ABB ACH550-UH Specifications

General

Brand	ABB
Model	ACH550-UH
Category	Controller
Language	English