Argus 010-523-B2, User Manual

Page: 16 / 32

3.0 GENERAL
3.1 Scope
This instruction manual covers the installation, and operation of Argus Technologies' Battery
Charger.
3.2 Introduction
The Argus Battery Charger employs a high frequency switched mode conversion technique to pro-
vide a fully regulated and isolated DC output from the A.C. mains. The unit provides external con-
nections for input, output and alarm interfaces. The units are available in 12V single output, 24V
single output and 12V/24V dual output models.
3.3 Features
The following sections (3.3.1 through 3.3.6) will cover the various features available on the Argus
Battery Charger.
3.3.1 Battery Transfer Circuit:
The transfer process (connecting the battery to the load) is hardware controlled and so transfer can
occur even in the event the micro-controller is not functioning. The charger firmware can discon-
nect the battery from the load in one of two ways.
1) Standard Disconnect: The micro-controller disconnects the load but does not disable the
transfer circuitry. If the load power supply is not functioning the load voltage will drop to the
transfer voltage (about 11.5V) and the transfer circuit will reconnect the battery.
2) Hard Disconnect: The relay connecting the battery to the load will be forced off and the
transfer circuitry will be disabled for 10 seconds. The transfer circuitry will re-enable afer the
load voltage has; a) risen about 0.2V (0.4V) above the battery voltage, or b) fallen to the low
voltage disconnect level. The transfer circuitry will then be reenabled in preparation for the next
transfer. The load will be disconnected from the battery regardless of the condition of the load
power supply.
3.3.1.1 Connecting the Battery to the Load:
The transfer circuit will connect the batteries to the load in less than 1 ms from the time the voltage
at the output of the charger (connected to the load) drops to 11.5V from greater than 12.0V.
The load voltage must exceed 12.0 V in order to reset the transfer circuitry. If the load voltage
does not rise above 12.0 V before failing transfer may not occur.
The charger will turn off as soon as a transfer takes place.
3.3.1.2 Manually disconnecting the battery from the load.
To manually disconnect the battery from the load press the battery disconnect switch located on the
front panel of the charger. The charger will do a hard disconnect.
ARGUS TECHNOLOGIES 010-519-C0 Rev. A Page 2 of 15