
Chapter 1. Installation
20
Sentinel™ User’s Manual
1.8.6 Wiring the Alarm Relay
The maximum electrical rating for the relay is listed in Chapter 7,
Specifications
. The alarm relay can be wired as
either
Normally Open
(NO) or
Normally Closed
(NC).
An alarm relay should be wired for
fail-safe
operation. In
fail-safe
mode, the alarm relay is constantly energized,
except when it is triggered or a power failure or other interruption occurs. See
below for the operation of a
normally open alarm relay in
fail-safe
mode.
Connect the alarm relay in accordance with the wiring instructions shown on the label inside the enclosure #1 rear
cover (see
). For wiring diagrams, see either
(AC) or
(DC).
Figure 15: Fail-Safe Operation
NC
C
NO
ALARM
MONITORING
DEVICE
Fail-Safe
(not triggered)
(triggered or power failure)
Fail-Safe
DEVICE
MONITORING
ALARM
NC
C
NO
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