Relays – RKI Instruments Beacon 800 User Manual

Page 10

7 • Internal Description

Beacon 800 Gas Monitor Operator’s Manual

AC Terminal Strip

The 3-point AC terminal strip is above the controller terminal strip (see Figure 1). The AC
terminal strip facilitates wiring connections to the AC power source. The GND terminal is
factory wired to the ground stud.

Relays

The Beacon 800 includes 16 channel relays and three common relays. Both sets of relay
contacts are single-pole, double-throw (SPDT) and are rated for 3 amps at 115 VAC
(resistive).

NOTE: In the Configuration menu, you can select normally energized, or normally de-

energized relays for each channel relay. This section describes the default
setting: normally de-energized.

The alarm 1 and alarm 2 common relays are factory-set as normally de-
energized and the fail common relay is factory-set as normally energized. The
normally energized/normally de-energized setting for the alarm 1, alarm 2, and
fail common relays is not user-adjustable.

Channel Relays

The 16-channel relays are above the alarm terminal strips (see Figure 1). These relays
are dedicated to specific channels and alarm levels.

Table 3: Terminal Assignments for the Controller Terminal Strip

Terminal No.

Connects to:

24VDC
(BAT-/BAT+)

DC power source (you can use DC power as a primary or
backup power source.)

ALM2
(C, NO, NC)

Common alarm 2 (external alarm)

ALM1
(C, NO, NC)

Common alarm 1 (external alarm)

FAIL
(C, NO, NC)

Common fail (external alarm)

+28V

Communication

GND

Communication

RESET (2)

Reset switch (factory-wired)

BUZ-/BUZ+

Internal buzzer (factory-wired)

If used as primary power source do not make wiring connections to the AC terminal strip.

Activates if any gas channel recognizes an alarm 2 condition.

Activates if any gas channel recognizes an alarm 1 condition.

Activates if any gas channel or the Beacon 800 recognizes a fail condition.