5
Rear Panel Wiring
This system setup will provide continuous power to the load and maintain the battery bank with the
smart charger while AC power is on. There is a seamless transfer of the load to the battery when the
AC power goes off. The LVD will disconnect the battery if the voltage drops below 10.0 VDC. The
battery reconnects once AC power is restored and battery voltage reaches 12.5 VDC.
20.84
mm
AC
Frame
Ground
Internet
Load
-
+
Battery
-
+
Charger
-
+
Figure 2: Rear panel connections of a HE1U-XX12-BBLVD-MU model.
Rear Connectors
20.84mm
+5V
G
Alarm OUT
Alarm IN
Factory
Jumper
Figure 3. Alarm wiring shown with factory jumper to silence alarm condition.
B5V and Alarm IN Output Status Between G and Alarm OUT
Output Status
Switch Closed
Alarm Closed
Alarm ON/LOW
Shorted
Switch Open
Alarm Open
Alarm OFF/HIGH
Open
The Alarm OUT is an open drain MOSFET referenced to G. The Alarm OUT can sink a maximum
current of 500 mA at a maximum voltage of +60 VDC. The Alarm IN, also referenced to G, is a LED
in series with a 220 Ohm resistor internally, and can withstand 50 mA max. A factory jumper is
installed from +5 to Alarm IN to silence the alarm. The jumper can be replaced with external wirings
to a switch or a relay.
