page 20
Smartrack User Manual
ETC Ltd
4.8. Signal wiring
Smartrack uses the international digital dimmer standard USITT DMX512 (1990)
to receive dimmer drive signals from a controller. DMX wiring requires twisted
pair and overall screen cable (Belden 9841 or equivalent), rated for RS485.
The signal cable loops from rack to rack, and will be terminated to the electron-
ics on the front door. For the time being, run the cable continuously through the
racks, using the power wiring chamber, allowing about 1m of slack for termina-
tion in each rack.
L1
L3
L2
N
Laying in the load wires.
Note the arrangement of
wires into Earth, Neutral and
phase wires, according to
the phase of the load circuit
(P1, P2 or P3). Laying the
wires in this way makes
connection to the load
terminals on the power
assembly easy and quick.
If using three core or
multicore cables, spread
them evenly across the nine
cable bunches, and strip
back the outer insulation to
the cable tie.
Load wiring for other racks
in the stack should be
bundled with the wires
shown, and passed through
the cable port to the rack
above or below, then laid in
as shown.
Earth Neutral Phase
P1 P2 P3 P1 P2 P3 P1 P2 P3
Cut cable to 33cm from cable tie
Trim insulation 6mm