28
Unison
®
DRd Rack Enclosure Installation Manual
Connect Load Wires
Load wires are terminated to the load lugs on the right side of the rack. In 120 VAC and
240/277 VAC DRd racks, load neutral and load ground wires are terminated to the terminal
strips on the back panel of the rack. In 230 VAC rack types, load neutrals are connected to
the left side of the rack, stacked on top of the input feeds to maintain a true neutral
disconnect.
Phase balancing of the loads is set from within the Architectural Control Processor (ACP)
“Dimmer Setup” menu. Reference the related Architectural Control Processor configuration
manual for details.
W A R N I N G :
Use of emergency modules (ED15AFE or ER15AFE) in CE 230V DRd rack
enclosures require the neutral (N) lug in place of the neutral jumper per
module.
C A U T I O N :
A two-wire circuit with
separate hot/live and neutral conductors is required
for
every branch circuit that will be connected to the Unison DRd rack. Shared neutral
(multi wire) branch circuit arrangements are not recommended for phase-control
dimming systems due to harmonics and potentially elevated neutral currents in a
shared neutral arrangement.
For retrofit installations where shared neutral circuits are already installed, or track
lighting installations where the track has a shared neutral, consult ETC Technical
Services for rack installation guidelines.
L1
L2
L3
N
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Load wire phase
Load wire
ground bus
Load wire
neutral bus
120, 240, and 277 VAC DRd
racks share similar load lugs.
L1
L2
L3
N
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Load wire phase
Load wire
ground bus
Load wire
neutral bus
230 VAC DRd racks have a
neutral disconnect bus structure.
This design places neutral lugs
on the same side of the rack as
the main feeds. Neutral output
lugs are numbered on the filter
PCB. It is important to wire hot
and neutral from each load to the
corresponding numbered
outputs.
