11
10
In normal operation, the DC
output supplies the load and
an internal 1 amp trickle
charger. The trickle charger
maintains the connected
battery at full charge until
needed. The current flow
in this operating condition
indicated in
RED
.
In the event of power failure,
the load instantly begins
drawing from the battery as
power source, running until
either the battery is fully
discharged or the unit goes
into low voltage shutdown. The
configuration of the schottky
diodes on the battery output
line prevents current from
backfeeding into the unit. The
current flow in this operating
condition is indicated in
BLUE.
Battery Backup Option
NOTE:
The diagrams below show the voltages for a 24V system, but this option is
available for every standard output voltage model.
27.2V
1A Charger
In
Out
Main PCB
DC Output 28V
Batt -
Batt +
OP -
OP +
24V Battery
To Load
The Battery Backup Option allows you to connect a battery to the output of your unit to serve
as a backup power source in the event of power failure.
The Battery Backup circuit is designed so the diodes are reversed biased in normal operation
and forward biased in event of power failure. Basically, whichever source (the battery or the
DC Output) has the higher voltage will take precedence in supplying power to the load.
To set up the Battery Backup:
1. Connect the Load to the output terminals labelled
OP+
and
OP-
2. Connect the Battery to the output terminals labelled
Batt+
and
Batt-
Normal Operation
WARNING:
Do not connect a battery to the unit’s output unless it has the
Battery Backup Option
.
This will cause serious damage to the unit and is not covered by the Warranty.
27.2V
1A Charger
In
Out
Main PCB
DC Output 0V
Batt -
Batt +
OP -
OP +
To Load
24V Battery
Output Failure
