RKI Instruments Beacon 800 User Manual
Page 40
37 • Heavy Duty Relay Board
Beacon 800 Gas Monitor Operator’s Manual
and to J1 on the upper left of the display board. The other cable has a three position
connector on each end, but one position is unused. This two wire cable runs from TB5 in
the upper right of the heavy duty relay board to TB3 on the main board below the power
supply. If the recorder output board is also installed, this cable has an additional section
which connects to J1 on the recorder output board.
The heavy duty relay board provides four extra sets of relay contacts which can be used to
control devices drawing too much current to use the Beacon 800’s standard relay
contacts. The four relay contact terminal strips are located along the bottom of the heavy
duty relay board. An LED is located just to the right of each terminal strip which indicates
when that relay is energized. The relay contacts are rated 30 A at 240 VAC, and 30 A at
125 VAC. A typical use for the heavy duty relay board is controlling ventilation fans in a
parking garage.
Wiring
Perform the following procedure to connect external devices to the heavy duty relay
board.
1.
Turn off Power to the Beacon 800 at the power source.
2.
Open the Beacon 800 door and place the power switch in the off position.
3.
Install an appropriately rated cable bushing or conduit in an unused conduit hub on
the bottom of the Beacon 800 housing.
4.
Loosen the two captive thumbscrews (on the right side of the display board) that
secure the board to the standoffs, until the screws are disengaged from the standoffs.
5.
Flip the right side of the display board out toward the housing door. (The standoffs
under the left side of the display board are hinged, which allows the display board to
move in this manner.)
6.
Route wires in conduit or cable from a device through the selected conduit hub into
the Beacon 800.
CAUTION: Use wire or cable that is appropriately rated for the voltage and current draw
of the device(s) being used.
7.
Connect the wires to the heavy duty relay board, a power source, and the device as
illustrated in Figure 16.