RKI Instruments Beacon 110 - Manual (Page 9)

Beacon 110 Operator’s Manual 5
Terminal Strips
The Beacon 110 includes terminal strips for external and factory wiring connections. See
“Wiring the Beacon 110” on page 13 for detailed wiring procedures.
• AC In Terminal Strip. The AC in terminal strip is a 3-point terminal strip located in the
lower left corner of the main PCB. It facilitates wiring from the AC power source.
Table 2 lists the function of each terminal.
• Alarm Terminal Strip. The 9-point alarm terminal strip is located along the bottom
edge of the main circuit board to the right of the AC in terminal strip (see Figure 1). It
facilitates wiring external alarm devices (horn, strobe, etc.) to the alarm relay contacts
and includes common (C), normally closed (NC) and normally open (NO) terminals for
fail, alarm 1, and alarm 2.
• Controller Terminal Strip. The 8-point controller terminal strip is located along the
bottom edge of the main circuit board to the right of the alarm terminal strip (see
Figure 1). The controller terminal strip facilitates various internal and external wiring
connections. Table 3 lists the function of each terminal.
• Detector/Transmitter Terminal Strips. Three adjacent terminal strips are located
along the right side of the main circuit board above the controller terminal strip (see
Figure 1). These three terminal strips facilitate wiring connections to a detector or a 4 -
20 mA transmitter. The lower 4-point terminal strip is labelled LEL and is used to wire
a combustible detector. The middle 2-point terminal strip is labelled Oxy and is used
to wire an oxygen detector. The top 3-point terminal strip is labelled AMP and is used
to wire 4 - 20 mA transmitters or direct connect preamp type detectors. Although
terminal strips are present for various types of detectors, only one detector head at a
time may be wired to the Beacon 110.
Table 2: Terminal Assignments for the AC In Terminal Strip
Terminal Connects to:
L Hot (line) wire from AC power source.
N Neutral wire from AC power source.
G Earth ground
Table 3: Terminal Assignments for the Controller Terminal Strip
Terminal Connects to:
Alarm Buzzer + & - Factory installed buzzer (factory-wired)
Alarm Reset (2) Reset switch (factory-wired)
4 - 20 mA Output + + connection of 4 - 20 mA output
4 - 20 mA Output - - connection of 4 - 20 mA output
EXT DC (24V BATT) +
+ connection from 24 VDC power source 1 (or 24 V backup battery)
EXT DC (24V BATT) -
- connection from 24 VDC power source
1
(or 24 V backup battery)
*
1
If DC power is used as the primary power source, do not make wiring connections to the AC terminal strip.