Alarm Relay Board
Installation Guide
Page 1 of 3
P/N: 01513-001 Rev. A
The Alarm Relay Board (ARB) is used to provide external annunciation of controller enclosure and
peripheral enclosure tamper events; either an opened enclosure cover or for an enclosure that has
been removed from its mounting location (requiring additional installation steps by the Installer). The
ARB enables NXT-family and PXL-family controllers to meet UL-294/CSA Class 4812 requirements
for annunciation of controller tamper incidents. It is designed to accept standard types of tamper
switches. The Installer must supply the external annunciation device (alarm, signal light, etc.).
Figure 1: Alarm Relay Board Diagram
1.0
ARB PCB Installation
The NXT/PXL standard enclosure has a set of four PEMs in the upper-right corner of the enclosure to
which the ARB is mounted.
The NXT-4x4 and KPS power supply enclosure has four holes in the upper-right corner of the
enclosure. The ARB is mounted in this location using four stand-offs.
2.0
Tamper Switch Installation
Keri provides one enclosure tamper switch with each ARB. The switch is typically installed along the
edge of the enclosure opposite the enclosure hinge and clear of the enclosure lock (see Figure 2 on
page 2).
TAMPER SWITCH
1
2
BYPASS
1
2
12 VDC
GND
N/C
COM
N/O
J1
J2
J3
J4
J5
J6
RELAY
Red LED
Green LED
1
2
3
4
5
Relay Contacts
Unit Power
Tamper Switch
Connections
NXT Tamper
Connection
Tamper Bypass
Jumpers
Green LED
unit in
non-alarm
state
Red LED
unit in
alarm state
