Securitron BPS-12-24-1 Installation Instructions

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SECURITRON POWER SUPPLY MODEL BPS-12/24-1

OPERATION AND INSTALLATION INSTRUCTIONS

1. DESCRIPTION

Securitron's Model BPS-12/24-1 is a field selectable 12 volt DC or 24 volt DC, 1 Amp power
supply delivered in a single lockable enclosure with the line voltage connection to be made by
screw terminals. The unit features a regulated output with an independent sealed lead acid/gel
cell battery charging capability. The voltage level s o f the de di cated battery charging circuit track
the selector switch SW1 and are indirectly curren t limited to a maxi mum of 100mA. The output
MUST NOT be adjusted! This unit meets Class 2 electrical requirements, which means under
the National Electrical Code that output wiring need not be in conduit. A lways check with your
local building department to make sure you are complying with applicable wiring codes before
installing these units. (Canada only: For C-UL listed applications the unit shall be installed in
accordance with Part 1 of the Canadian Electrical Code). Note that a special version of the

BPS-12/24-1 operates on 220 VAC input. This carries the part number: BPSH-12/24-1
and has not been investigated by UL.

2. SAFETY
Two hazards are present in the BPS-12/24-1 supply. Line voltage input presents a high

voltage shock hazard and the battery output presents a high energy hazard. If shorted, the
battery output can generate sufficient heat to ignite some m aterials. To insure safety, note first
that the cover LED is on whenever the supply offers danger, which is either if it is receiving line
voltage or if batteries are operating. The supply must only be opened by trained service

personnel. The AC Power Green LED located on the control board is lit when AC
voltage is present on the Red, Orange and Yellow transformer wires. The DC Power
Red LED is lit when the supply is receiving line voltage or if the batteries are
operating.

WARNING: If a battery pack is installed, the battery pack voltage must match the
setting of the 12V/24V selector switch on the control board. If a 12V battery is
installed the 12V/24V selector switch must be set to 12V. If a 24V battery is installed
the 12V/24V selector switch must be set to 24V.

3. OPERATING CHARACTERISTICS

3.1 LINE VOLTAGE INPUT

120 VAC should be input to terminals "H", "N", "G", as shown in the dra wing. The line voltage
current drawn by the power supply module will be approximately 500 mA. Note that a special

version of the power supply (BPSH-12/24-1) accepts 220 VAC input.

3.2 DC OUTPUT AND VOLTAGE ADJUSTMENT

The DC voltage of the supply is selected by the 12V/24V Selector Switch. The supply is
capable of outputting 1 Amp when set at precisely 12V or 24V DC.

3.3 LED INDICATORS

The AC Power Green LED located on the control board is lit when AC voltage is present on the
Red and Orange transformer wires. The DC Power Red LED is lit when the device is supplying
DC voltage or if the batteries are supplying the operating power. The fro nt cover LE D is lit when
voltage is present on the power supply before the Polyswitches. The status of LEDs can be used
to diagnose certain fault conditions and are listed in the table below:

© Copyright, 2011, all rights reserved PN# 500-21900
Page 1 Rev. F, 06/11

LED DIAGNOSTIC TABLE

RED (DC) GREEN (AC) DESCRIPTION
on board on board

ON ON Normal Operation
ON OFF No AC, Battery backup is powering output
OFF ON No DC output, Polyswitch may be tripped
OFF OFF No AC, no battery or Polyswitch may be tripped

The front cover RED (DC) LED is lit when DC voltage is sensed before the Polyswitches. The
RED LED (DC) on the control board is lit when DC voltage is sensed after the output
Polyswitch at the DC+ Output. If the front cover RED (DC) LED is lit an d the RED (D C) LED on
the control board is not lit, the output Polyswitch may be tripped.

3.4 BATTERY CHARGING CAPABILITY

The power supply incorporates a battery charging circuit appropriate for standby rated sealed
lead acid or gel cell batteries. Dry cell or NICAD batteries must not be used. Batteries are
an option. The power supply can be used with or without them. The battery pack of the
appropriate voltage, matching the 12V/24V Selector Switch

, is merely connected to the red
and black battery leads following correct polarity. The batteries will be ke pt charged at all times
by the power supply acting in concert with the components on the board. In the event of a line
voltage power failure, the batteries will automatically drive the load. If the emerge ncy release
terminals are opened, battery power will, however, be cut off just as normal power from the
power supply would be.

Figure 1: BATTERY PACK SELECTION

Chart to determine the size of the battery pack

CURRENT

DRAW 1HR 2HR 4HR

UL

STD 8HR 16HR 24HR 48HR 72HR

150mA 5AH 5AH 5AH 5AH 5AH 5AH 8AH 8AH 12AH
300mA 5AH 5AH 5AH 5AH 5AH 8AH 12AH 16AH NA
500mA 5AH 5AH 5AH 5AH 8AH 12AH 16AH NA NA
750mA 5AH 5AH 8AH 12AH 12AH 16AH 20AH NA NA
900mA 5AH 5AH 8AH 12AH 12AH NA NA NA NA

BATTERIES MUST BE SEALED LEAD ACID TYPES.
THIS CHART IS VALID IF BATTERIES ARE OPERATED AT ROOM TEMPERATURE.
BATTERIES SHOULD BE REPLACED AFTER 5 YEARS OF USE.

The components utilized on the unit for battery charging function for battery packs up to 20 Amp
hours in capacity whether 12 or 24 volts. Note that certain long backup times are not
achievable with the maximum size of the battery packs (“N/A” appears in the chart). Consult
the battery pack chart to calculate the correct battery pack based on desired ba ckup time and
the current drawn by the load. Note that batteries must be replaced at least every 5

years as that is their maximum operating life.

3.5 CIRCUIT POLYSWITCHES AND FUSING

A 1 Amp AC fuse is on the bo ard together with 2 each 2.5 Amp DC Polyswitch. The AC fuse
is on the hot 120 VAC input and protects against a transformer intern al short. A sh ort in the DC
load will not blow the AC fuse as the power supply is short-circuit protected. If more than its
rated output is attempted to be drawn, it will shut off.

A DC short, therefore, cannot damage the power supply but still will cause problems as the load
will be shut off. To protect against a short circuit when batteries are being employed, a 2.5
Amp DC Polyswitch breaker is provided. The Polyswitch functions as an automatic circuit

PN# 500-21900
Page 2 Rev. F, 06/11