24Vac Power Supply Connection - Acuity Controls nLight ECLYPSE User Manual

BACnet MS/TP Communication Data Bus Fundamentals

24VAC Power Supply Connection

Use an external fuse on the 24VAC side (secondary side) of the transformer, as shown in the figure below, to protect all
controllers against power line spikes.
The ECLYPSE Controller uses the S terminal as the signal reference point for the data bus (see
bels for BACnet MS/TP Data Bus Polarity for other
AC Power
Source
24 / 120 / 208 /
240 / 277 / 347 /
480 VAC, 1Ø, 2-
Wire plus Ground
Figure 104: The 24V COM / C Terminal of all Devices must be Connected to the Grounded Power Supply Bus
nLight ECLYPSE
Manufacturers).
Power Supply
Fuse: 4A Max.
Fast Acting
24 VAC
Electrical
System
Ground – At
Transformer
Only
Maintain consistent
polarity when connecting
controllers and devices to
the transformer.
The 24V COM / C
terminals of all devices
must be connected to the
power supply bus that is
grounded.
Common Identification La-
BACnet Device
24V AC/DC
24V COM
BACnet Thermostat
RC
C
108