Securitron AQU243 - Manual (Page 2)

Installation Instructions AQU126 & AQU243 (Non-Listed)
AQU126, AQU243 (Non Listed) Instructions Doc.# 500-33030 Rev. B
Page 2 of 6
The AQU243 and AQU126 become an uninterruptible power supply when a stand by battery(s) is connected with the
battery cable provided. These supplies have a special power limiting circuit that allows the batteries to be float
charged across the output without lock up or chirping on and off. The battery(s) is protected with an automatic
resetting circuit breaker and diode for over current and accidental reversed battery hookup. Precision float charging
means faster recovery time and longer life for the battery(s). There is no switch over or voltage drop when input
power fails. Standby battery(s) can be any capacity between 4 and 40 Amp hours. The AQU243 24vdc is rated for 3
Amps continuous current with 300ma reserved for battery charging. The AQU126 12vdc is rated for 6 Amps
continuous current with 500ma reserved for battery charging.
Power Supervision utilizes 2 relays and electronics to indicate 2 levels of the stand by battery. The AC FAIL relay
provides a form C contact set to indicate the AC has failed, the supply is running on standby batteries. The LOW
BAT relay provides a form C contact set to indicate the battery(s) is low, not much stand by power is left. Either of
these form C contacts can be used to signal a buzzer and/or other signaling device. Both of these relays are
normally energized for fail-safe operation.
Battery-Cut Off uses a 3
rd
relay with electronics to disconnect the battery from the power supply and load at the end
of it’s service limit, preventing deep discharge that will damage the battery(s). This relay is normally energized as
are the supervision relays.
Explanation of Terminals and LED’s
AC Input Terminals are marked High Voltage (L)ine, (N)eutral, and (G)round. The terminal block and AC LED are
mounted within a high voltage barrier. The terminal block is self-clamping and can accept wires from 12awg to
18awg.
AC LED adjacent to the AC input terminals is ON Green when AC is applied.
AC FAIL Terminals NO-Normally Open, C–Common, and NC–Normally Closed. The normal relay position
indicates the AC power is on and the relay is energized. The terminal block is self-clamping and can accept wire
from 14awg to 24awg. The contacts are rated for up to 2A resistive load to 120 volts. When the AC fails the relay
drops off normal.
LOW BAT Terminals NO-Normally Open, C–Common, and NC–Normally Closed. The normal relay position is
energized and indicates the output battery voltage is in the normal range. When stand battery(s) reach a low level,
the relay drops off normal.
DC Output Terminals on the AQU243 and AQU126 are marked (–DC+) output. The AQU243 has a DC output of
24vdc with 3 Amps of continuous current, reserving 300ma for battery charging. The AQU126 has a DC output of
12vdc with 6 Amps of continuous current, reserving 500ma for battery charging. The terminal block is self-clamping
and can accept multiple wires from 10awg to 24awg. The Red LED adjacent to terminal block is ON when output
voltage is present.
The AQU243 and AQU126 DC output is not class II power limited. The multi-output “EC” models mounted in an
enclosure have a PDM-8C distribution board. The DC output of the AQU243 or AQU126 is fed to the distribution
board where each output has a PTC circuit breaker. The outputs from the PTC circuit breakers are class II power-
limited. You must keep a .25” minimum spacing of power-limited wires to non-power limited wiring.
The input and output terminals on the PDM-8C are self-clamping and can accept multiple wires from 10awg to
24awg. Each output has a Green LED adjacent to its output that indicates voltage present. Adjacent to the input
terminals of the PDM-8C board is main Power LED and Fuse. The fuse is an ATO automotive type. Replace with
recommended size. The main power LED will be Green when main power is on. If polarity is incorrect the main LED
will light RED.
DC Power LED adjacent to battery connector is ON Red when main DC is on.
Battery Connector is marked –Bat+. This is a .156” 2 position header with lock. The provided battery cable plugs
in to this. The provided cable is 12” long. For remote battery mounting, a 36” battery cable is available, part WA-
36IBAT. The battery cable wires are Red and Black. The red connects to the positive and black to the negative of
the battery. The AQU243 24vdc model comes with a 15” black wire with female slip on connectors on each end for
connecting 2 12v batteries in series.