Chapter 2: Installation August 7, 2006
2-2 AIWN-UM-7001-01
POWER AND GROUND CONNECTIONS
Power and ground connections are located on the back of the ENIU.
Ground Connection
To assure proper operation, the ground stud located on the back of the ENIU (see Figure 2-2 on page 2-3) should
be connected to a good earth ground. There must be no switching or disconnecting devices in the grounding circuit
conductor between the ENIU and the point of connection to the grounding electrode conductor.
This procedure establishes a connection between the ENIU and a ground connection. A frame ground termination
(#8 screw) is provided on the back of the ENIU for a frame ground connection. This connection must be made in
accordance with all local and national electrical codes. The ENIU should be connected directly to a grounding
electrode conductor or to a bonding jumper from a grounded electric box.
6 Connect the power supply to the DC IN connector located on the back of the ENIU.
– If using AC power, connect power supply to the AC source (110 – 240 VAC, 50 – 60 Hz).
– If using DC power, connect power following local practices. (See “Power and Ground
Connections” on page 2-2.) See Appendix A: Specifications for fuse size.
7 Verify that the STATUS LED is lit.
Figure 2-1. Inserting ENIU into Mounting Bracket
DANGER
To avoid the possibility of severe and potentially fatal electric shock, use extreme care when
working with the power terminations at the back of the ENIU.
WARNING
Before making any connections to a ENIU, verify that the power is off (unplugged or fuse
removed at the fuse and alarm panel).
Step Action
20384-A1
E
N
I
-
E
G
X
X
E
G
X
X
1
B
