Securitron AQU243-8C - Manual (Page 2)

Installation Instructions AQU126, AQU126-8C, AQU243 and AQU243-8C
AQU126, AQU126-8C, AQU243 and AQU243-8C Instructions Doc.# 500-33025 Rev. B
Page 2 of 6
AQU126 & AQU243 Description
The AQU243 and AQU126 are clean, efficient, heavy duty, low frequency off line switching power supplies with
precision battery charger and power supervision. These supplies are so clean that they can be used anywhere a
linear or switching supply is recommended. The filtering and switching systems we use are very similar to what you
would find on high quality computers. Even though the AQU243 (24v) and the AQU126 (12v) are both 100 watt
power supplies utilizing the same printed wiring board, we use separate supplies for 12v and 24v models for
optimum performance. The universal input of 85vac to 260vac allows them to be used anywhere in the world
without adjustments to the power input. The ability to run at very low AC voltages allows the AQU126 and AQU243
to tolerate brown outs very well. The AQU243 and AQU126 are fully self-contained and isolated from the AC power
input line to all world safety standards. Each power supply weighs less than 1.5 lbs and occupies less than ½ of a
cubic foot of cabinet space.
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.
PDB-8C-.72A/1.5A Description
The PDB-8C is a power distribution board. The PDB-8C converts a non power limited output to 8 class II power
limited outputs. The PDB-8C works much like the circuit breaker panel you will find most homes. There is a main
power input and a main fuse then the positive side is fed to 8 circuit breakers. The circuit breakers provide class II
power limited outputs with fault isolation of each output circuit. Each circuit has a green LED to indicate its status.
These output wires can be run outside of the enclosure without conduit. You must keep a minimum separation of
.25” between power limited and non-power limited wiring.
Explanation of Terminals and LEDs
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.