Securitron BACS-12-20 - Manual

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Page 1 Rev. D, 08/11
SECURITRON POWER SUPPLY MODEL: BACS-12-20
OPERATION AND INSTALLATION INSTRUCTIONS
1. DESCRIPTION
The part number expresses first the output voltage (12 VAC) and finally the maximum
output current capacity (the model BACS-12-20 can supply up to 20 amps at 12 volts). The
unit consists of a transformer, CCS-8 control board and CCB-8 “slave” board to which all installer
connections are made. The CCS-8 board accomplishes several functions. It provides terminals
for line voltage input and low voltage AC outputs on eight separate output circuits (the slave
board adds eight more), 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-12-20 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 a line voltage fuse and the fact that the line voltage input terminals
are under a warning guard plate. Finally, the 12 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-12-20), the unit requires 220 VAC
input. Apart from this change, all other characteristics are the same.
3.2 OUTPUT TERMINALS
The CCS-8 board has two types of output terminals. First, the “P” terminals are on individual
circuit breakers and carry 12 VAC on them. 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. Second, the “R” terminals are all for the return leg of the low voltage AC output and are
in common.
3.3 FUSING AND CIRCUIT POLYSWITCHES
An AC 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. The
Polyswitch is a special type of automatic circuit breaker. If one of the Polyswitches receives an
overload, it will rapidly cut the current down to a small leakage current (about 100 mA) which
will allow the rest of the installation to continue to operate. Note that each “P” output
includes a slide switch and LED. The slide switch can cut power to its respective output and the
LED monitors when the output is powered. In the event of one of the Polyswitches tripping, the
associated LED will go out. If all the LED’s go out, the AC fuse has tripped (or line voltage has
been interrupted to the supply from some other cause). Always replace any blown fuse with
the same rated fuse.
When an individual Polyswitch trips, there is a reset procedure. First, correct the overload
condition. Next, all current must be removed from the Polyswitch for a period of 10
seconds. You do this by simply moving the associated slide switch to the “off” position. Then,
return the slide switch to “on” and operation will return to normal. If you haven’t corrected the