RKI Instruments Beacon 410 - Manual (Page 22)

18 • Wiring the Beacon 410 Gas Monitor Beacon 410 Gas Monitor Operator’s Manual
Beacon 410 does not include the battery charging feature, you may use a self contained
24 VDC backup that keeps its’ batteries charged while AC power is on and recharges the
batteries when AC power returns after a power failure. If your Beacon 410 includes the
battery charging feature, see “Battery Charging (Optional)” on page 25 for a complete
description of this feature and what type of battery to use. If DC power is the primary
power source, DO NOT connect AC power.
1. Turn off or unplug all incoming power to the Beacon 410.
2. Open the housing door, then place the power switch in the OFF position.
CAUTION: The power switch does not control DC input power.
3. Locate the DC input power terminals on the controller terminal strip near the lower
right edge of the main PCB (see Figure 1 on page 5). They are labelled EXT DC/24V
BATT+
and EXT DC/24V BATT -.
4. Install an appropriately rated cable bushing or conduit in an unused conduit hub on
the bottom of the Beacon 410 housing.
5. Guide a DC power cord or two wires in conduit through the selected conduit hub on
the bottom of the Beacon 410 housing.
CAUTION: Do not route power and detector head wiring through the same conduit hub.
The power wiring may disrupt the transmission of the detector head signal to
the monitor.
6. Connect the DC power wires to the controller terminal strip as shown in Figure 10
below.
Figure 10: DC Power Wiring
NOTE: The Beacon 410 will operate from the DC input down to 18.5 volts. If a self
contained backup battery is used, see its operator’s manual for a description of
its recharging characteristics. If your Beacon 410 includes the battery charging
feature and a backup battery is used, the Beacon 410 will recharge the battery
when AC power has returned after a power failure. See “Battery Charging
(Optional)” on page 25 for a complete description of the battery charging feature.
RS-485 Modbus Wiring
See “Wiring the Beacon 410 in a Modbus System” on page 54 for wiring connections to
the RS-485 Modbus terminals.
DC Power In Terminals on
Controller Terminal Strip
EXT DC
24V BATT
DC Power
24 VDC