ETC Unison DRd Dimming Rack Enclosure - Manual (Page 32)

28 DRd Enclosure Installation Manual
Connect Load Wires
Load wires are terminated to the load lugs on the right side of the enclosure. In 120V AC
and 240/277V AC DRd enclosures, load neutral and load ground wires are terminated to
the terminal strips on the back panel. In 230V AC enclosure types, load neutrals are
connected to the left side of the enclosure, 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 “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
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 DRd. 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
enclosure lighting installations where the enclosure has a shared neutral, consult
ETC Technical Services for 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 277V AC DRd
enclosures 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
230V AC DRd enclosures have a
neutral disconnect bus structure.
This design places neutral lugs
on the same side of the enclosure
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.