RKI Instruments Beacon 200 - Manual (Page 14)

14 • Internal Description
.
NOTE: The alarm 2 channel relays may be set to operate as individual
channel fail relays. See the Configure Channel Settings section of
Chapter 5 for instructions.
• Common relays. The three common relays, alarm 1, alarm 2, and fail,
are to the left of the controller terminal strip (see Figure 1). These relays
are common for both channels.
For example, the alarm 1 common relay energizes if either channel 1 or
channel 2 recognizes an alarm 1 condition.
Fuses
There are three fuses that are used in the Beacon 200. Two of them are AC
fuses and one of them is a DC fuse.
• AC Fuses. The two fuses located directly to the left of the controller
terminal strip are the AC fuses. They cut off the incoming AC power in
the event of a short circuit or other electrical fault which causes a high
current draw in the Beacon 200. They are housed in vertical fuse
holders and are held in the holder by a quarter turn cover. They are
labelled as F2 (top fuse) and F3 (bottom fuse) on the PCB silk-screen
and are rated at 3 A, 250 V.
• DC Fuse. The fuse located to the left of the power switch is the DC
fuse. It cuts off incoming DC power in the event of a short circuit or
other electrical fault which causes a high current draw in the Beacon
200. It is also housed in a vertical fuse holder and is held in the holder
by a quarter turn cover. It is labelled as F1 on the PCB silk-screen and
is rated at 6A, 250 V.
K5 K6 K7
Channel 2, Alarm 1
Channel 1, Alarm 2
Channel 1, Alarm 1
K1 K2 K3
Common Alarm 1
Common Alarm 2
Common Fail
K4
Channel 2, Alarm 2
Figure 3. Beacon 200 Channel Relay Allocation