Securitron BACS-24-10 - Manual

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© Copyright, 2011, all rights reserved PN# 500-17100
Page 1 Rev. D, 06/11
SECURITRON POWER SUPPLY MODEL: BACS-24-10
OPERATION AND INSTALLATION INSTRUCTIONS
1. DESCRIPTION
The part number expresses first the output voltage (24 VAC) and finally the maximum
output current capacity (the model BACS-24-10 can supply up to 10 amps at 24 volts). The
unit consists of a transformer and CCS-8 control board to which all installer connections are
made. The board accomplishes several functions. It provides terminals for line voltage input
and low voltage AC outputs on eight separate output circuits, so that a number of devices can be
powered separately. Each control circuit has an individual slide switch to turn it on and off and
an LED to annunciate its status. The BACS-24-10 is Class 2 rated when installed following
these instructions.
2. SAFETY
Two hazards are present in the supply. Line voltage input presents a high voltage shock hazard
and the low voltage AC output, represents a high energy (current) hazard. To insure safety,
note first that the cover LED is on at any time that the supply is dangerous. When the cover
LED is on, the supply enclosure must only be opened by trained service personnel.
Other safety features include line voltage and low voltage AC fuses and the fact that the line
voltage input terminals are under a warning guard plate. Finally, the 24 VAC outputs of the
supply are all on individual 2.5 Amp Polyswitch protected circuits to protect against high energy
hazard.
3. OPERATING CHARACTERISTICS
3.1 LINE VOLTAGE INPUT
110-120 VAC should be input to terminals "H", "N", "G", as shown in the drawing. This is fed to
the input of the transformer through factory made connections. The line voltage current drawn
by the power supply module will be approximately 5 amps.
Note: if the suffix “H” appears in the part number (i.e. BACSH-24-10), the unit requires 220 VAC
input. Apart from this change, all other characteristics are the same.
3.2 CENTRAL RELEASE TERMINALS
If the unit has power, the LED on the cover will illuminate. One leg of 24VAC will then be on
terminal F1. Connection must then be made between terminals F1 and F2 before this power is
routed to the "P" terminals. Terminals F1 and F2 therefore constitute an central release
point. NC contacts can be connected across terminals F1 and F2 to immediately cut power to all
devices controlled by the supply. Make sure that the switching capability of any switch or relay
contacts placed across F1 and F2 can handle the full output load of the power supply. If you do
not require any central release capability, jumper a wire between F1 and F2. Make sure this
wire is of sufficient gauge (thickness) to conduct the full output current of the supply.
Terminal FA is a free parking terminal used for other applications.
3.3 OUTPUT TERMINALS
The CCS-8 board has three types of output terminals. “P” terminals are on individual circuit
breakers and carry 24 VAC on them (when the central release terminals are closed). The “H”
terminal carries the full low voltage 24 VAC output current of the supply on a single terminal
(when F1 and F2 are closed). Use the “H” terminal for applications where the device being
powered requires more than 2 Amps of current. The Polyswitch circuit breakers cannot reliably
supply more than 2 Amps of current without tripping and you should never wire multiple “P”
terminals in parallel to supply increased current. This bypasses the safety role of the
Polyswitch breakers and also does not work very well. When two “P” terminals are wired in
parallel, current carrying capacity is not doubled. The current conducted through the two
terminals will not be identical so one switch will break first and then the second will immediately
trip. Always use the “H” terminal for applications requiring high current. Finally, the “R”
terminals are all for the return leg of the low voltage AC output and are in common.
3.4 FUSING AND CIRCUIT POLYSWITCHES
An AC fuse, “DC” fuse and eight Polyswitches are present on the board. The AC fuse is on
the hot 120 VAC input and protects against an internal short in the power supply transformer.