RKI Instruments Beacon 200 - Manual (Page 12)

12 • Internal Description
Main PCB
The main PCB is mounted inside the housing. The power supply mounting
plate is mounted to the main PCB with four standoffs and the display PCB
is mounted to the power supply mounting plate with four standoffs. The
main PCB includes the terminal strips, relays, fuses, and power switch.
Terminal Strips
The Beacon 200 includes four terminal strips for external wiring
connections. See “Wiring the Beacon 200 Gas Monitor” for detailed wiring
procedures.
• Detector/Transmitter Terminal Strips. Two detector/transmitter
terminal strips are located near the bottom left corner of the main circuit
board (see Figure 1). These two 9-point terminal strips facilitate wiring
connections to the detectors or transmitters. Although each terminal
strip can accommodate several different detector head models, only
one detector head at a time may be wired per channel. The top terminal
strip is for channel 1 and the bottom terminal strip is for channel 2.
• Alarm Terminal Strip. The alarm terminal strip is located along the
bottom edge of the main circuit board (see Figure 1). This 21-point
terminal strips facilitates wiring connections to external alarm devices
(horn, strobe, etc.). Terminals are provided for individual channel as well
as common alarm relay contacts.
• Controller Terminal Strip. The 10-point controller terminal strip is near
the lower right edge of the main circuit board (see Figure 1). The
controller terminal strip facilitates various internal and external wiring
connections. Table 3 lists the function of each terminal.
Table 3: Terminal Assignments for the Controller Terminal Strip
Terminal Connects to:
BAT -
- connection from 24 VDC power source
1
(or 24 V backup battery)
BAT +
+ connection from 24 VDC power source
1
(or 24 V backup battery)
+ CH1 OUT + connection of 4 - 20 mA output, channel 1
- CH 1 OUT - connection of 4 - 20 mA output, channel 1
+ CH2 OUT + connection of 4 - 20 mA output, channel 2
- CH2 OUT - connection of 4 - 20 mA output, channel 2
RESET (2) Reset switch (factory-wired)
BUZ-/BUZ+ Internal buzzer (factory-wired)
1
If DC power is used as the primary power source, do not make wiring connections to the AC terminal strip.