RKI Instruments Beacon 100 - Manual (Page 8)

8 • Internal Description Beacon 100 Gas Monitor Operator’s Manual
Fuses
The Beacon 100 includes one AC fuse (0.5 amp) and one DC fuse (1.5 amp).
AC fuse
The AC fuse holder is underneath the display board on the left hand side near the left
edge of the main circuit board. The AC fuse protects the AC line circuitry from short
circuit or overload. The AC fuse is rated at 0.5 amps.
NOTE: The standard configuration is for 115 VAC operation. 220 VAC operation is an
optional
configuration and must be specified when ordering.
DC fuse
The DC fuse is located underneath the display board on the right hand side (near the right
edge of the main circuit board). The DC fuse protects the DC line circuitry from short
circuit or overload. The DC fuse is rated at 1.5 amps.
Transformer
The transformer is at the center top of the PC Board (under the display screen). The
transformer receives the incoming AC voltage and converts it to a nominal DC voltage.
Terminal Strips
The Beacon 100 includes three terminal strips for external wiring connections. They are
located on the lower section of the main PC board just above the incoming wiring hubs,
and to the left and right edges of the main circuit board about in the middle. See Chapter
3, Installation and Start Up, for wiring procedures.
Input power terminal strip
The input power terminal strip is located below the display board on the left hand side of
the main PCB. The top three terminals are for AC power connections and are labeled “AC
POWER IN”
on the main circuit board.
The bottom two terminal positions are for DC power connections and are labeled “12
VDC IN”
on the main circuit board.
External alarm terminal strip
The 12-point external alarm terminal strip consists of the 12 left hand terminals on the
lower terminal strip located just above the wiring hubs on the bottom of the enclosure.
You connect wiring from external alarms (if applicable) to the external alarm terminal
strip. This terminal strip has common (C), normally closed (NC) and normally open (NO)
terminals for alarm 1, alarm 2, and alarm 3 connections, and also for FAIL condition.
These terminals are clearly marked on the PC board
Detector terminal strip
The 7-point detector terminal strip (Labeled 1 through 6) is directly to the right of the
external alarm terminals on the lower terminal strip. You connect wiring from the detector
head to the detector terminal strip. Terminals labeled 1, 2, 3, and 4, are for the wiring to the
detector head. These are also labelled “RED, WHITE, GREEN, BLACK” to correspond to
the sensor wire colors on certain sensor types. Terminals 5 and 6 are for connection of the
oxygen detector head and are labelled OXY+ and OXY -.