RKI Instruments Beacon 800 - Manual (Page 11)

Beacon 800 Gas Monitor Operator’s Manual Internal Description • 8
For example, the channel 1, alarm 1 relay energizes if channel 1 recognizes an alarm 1
condition. Figure 3 illustrates the allocation of the channel relays.
Figure 3: Beacon 800 Channel Relay Allocation
Common Relays
The three common relays are above the AC terminal strip (see Figure 1). These relays are
common for all channels.
For example, the alarm 1 common relay energizes if any channel recognizes an alarm 1
condition.
Power Switch
The power switch is to the left of the fuses (see Figure 1). The power switch turns the
incoming power source on and off at the Beacon 800. When the switch is up, the power is
on.
Power Supply
The power supply is near the top edge of the main circuit board. The power supply
receives the AC input from the external power source and converts it to a DC voltage that
is usable by the Beacon 800 circuitry.
Fuses
The Beacon 800 includes two AC fuses and one DC fuse. The fuses are housed in
extractor-type fuse holders behind the display board and to the left of the common relays.
• The AC fuses are the two 3A fuses. The AC fuses protect the AC line circuitry from
short circuit or overload.
• The DC fuse is the 6A fuse. The DC fuse protects the DC line circuitry from short
circuit or overload.
NOTE: If your Beacon 800 includes the optional Recorder Output Board or the Heavy
Duty Relay Board, please see “Chapter 7: Optional Recorder Output Board &
Heavy Duty Relay Board” on page 32 for a complete description of these options.
Channel 8
Alarm 1
Channel 1
Alarm 2