RKI Instruments 12 VDC Beacon 200 - Manual (Page 14)

10 • 12 VDC Beacon 200 Operator’s Manual
NOTE: The alarm 2 channel relays may be set to operate as individual
channel fail relays. See “Configure Channel Settings Menu” on
page 30 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 two DC fuses that are used in the 12 VDC Beacon 200. They are
located directly to the left of the controller terminal strip. They cut off the
incoming DC power in the event of a short circuit or other electrical fault
which causes a high current draw in the 12 VDC 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.
A third fuse located to the left of the power switch is labelled F1. This fuse
is not used in this version of the Beacon 200.
Power Switch
The power switch is located above the relays and to the left of the DC fuses
(see Figure 1). The power switch turns the incoming DC power source on
and off at the 12 VDC Beacon 200. When the switch is up, the power
switch is on.
Power Converter
The power converter is mounted to the power supply mounting plate with
standoffs. The power supply mounting plate is located behind the display
PCB and is mounted to the main PCB with four standoffs. The power
converter takes 12 VDC voltage supplied to the 12 VDC Beacon 200 and
converts it to 24 VDC which is used to run the 12 VDC Beacon 200.