Securitron BPS-12-1, BPS-24-1-CH, BPS-24-1 Installation Instructions

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SECURITRON POWER SUPPLIES MODELS BPS-12-1 & BPS-24-1

OPERATION AND INSTALLATION INSTRUCTIONS

1. DESCRIPTION
Securitron's Model BPS-12-1 is a 12 volt, 1 amp po wer supply delivered in a single lockable

enclosure with the line voltage connection to be made by screw terminals. Model BPS-24-1 is

the same unit with 24 volt, 1 amp output. All units feature regulated, adjustable power with
integral sealed lead acid/gel cell battery charging capability. All units also meet Class 2
electrical requirements, which means under the National Electrical Code that output wiring nee d
not be in conduit. Always check with your local building department to make sure you are
complying with applicable wiring codes before installing these units. Note that a special

version of the BPS series operates on 220 VAC input. This carries the part number
prefix: BPSH.

The models which incorporate the suffix “H” in the part number have no t been evaluated by UL.
These power supplies have only been evaluated by UL for use in the EXD-1 and EXD-1F FWAX
systems.

2. SAFETY
Two hazards are present in the BPS series 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 ma terials. To insure safe ty, 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 when the cover LED is on.

3. OPERATING CHARACTERISTICS

3.1 (BPS SERIES ONLY) LINE VOLTAGE INPUT

110-120 VAC should be input to terminals "H", "N", "G", as shown in the drawing. The line
voltage current drawn by the power supply module will be approximately 500 mA. Note that a

special version of the power supply (prefix: BPSH) accepts 220 VAC input.

3.2 DC OUTPUT AND VOLTAGE ADJUSTMENT

The DC capacity of the supplies depends on the exact voltage that is set and on whether or not
batteries are employed. The supplies can output 1 Amp when set at precisely 12 or 24 VDC.
However, we recommend that supplies not be operated at maximum capacity. This reduces the
possibility of heat induced failure and also allows for later expansion of the installation. When
the supply is used with batteries, available current capacity is reduced. This is because
the voltage must be set higher to 13.5 or 27 volts (these are the factory set values) and also
because some current is used to charge the batteries. 900 mA should be considered the

maximum output of a supply used with batteries.

3.3 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 is merely connected to the red and black battery leads following correct
polarity. The batteries will be kept 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 emergency release terminals are opened, battery power will,
however, be cut off just as normal power from the power supply would be.

© Copyright, 2011, all rights reserved PN# 500-10100
Page 1 Rev. D, 06/11

FIG. 1 BATTERY PACK SELECTION

CHART TO DETERMINE SIZE OF BATTERY PACK

BACKUP TIME DESIRED

150 MA
300 MA
500 MA

750 MA

MIN 1 HR 2 HR

4 AH

4 AH
4 AH

4 AH

4 AH
4 AH
4 AH

4 AH 4 AH

4 AH 4 AH
4 AH 4 AH
4 AH

4 HR

UL STD.

4 AH

4 AH
4 AH 4 AH
8 AH

12 AH

8 HR 16 HR 24 HR 48 HR 72 HR

4 AH
4 AH
8 AH

12 AH

4 AH

8 AH
12 AH
16 AH

8 AH 8 AH 12 AH

12 AH 16 AH

16 AH
20 AH

N/A
N/A

N/A
N/A
N/A

CURRENT DRAWN

"MIN" TIME REFERS TO FACILITY USING EMERGENCY GENERATOR WHERE THE
BATTERIES ARE ONLY REQUIRED TO OPERATE THE SYSTEM
FOR UNDER 3 MINUTES UNTIL THE GENERATOR TAKES OVER

U.L. STANDARD REQUIRES 4 HOURS OF BAT TERY OPERATION FOLLOWED BY
A 24 HOUR RECHARGE PERIOD AND THEN A SECOND 4 HOURS OF OPERATION

BATTERIES MUST BE SEALED LEAD ACID OR GEL CELL TYPES.

DRY CELLS WILL NOT RECHARGE AND WILL BE DAMAGED.
THIS CHART IS ONLY VALID IF BATTERIES ARE OPERATED

AT ROOM TEMPERATURE. IN A COLD ENVIRONMENT, CAPACITY IS REDUCED.
BATTERIES SHOULD BE REPLACED AFTER 5 YEARS OF USE.

The components utilized on the unit for battery charging function for batte ry packs u p to 20 am p
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 for proper battery charging the power supply

must be set at 27 volts in the case of a 24 volt system, and 13.5 vo lts in the case of a 12
volt system. Securitron power supplies are capable of this adjustment and if it is not made,

the batteries will not hold their full capacity nor their normal operating life, and may be
damaged. Also note that batteries must be replaced at least every 5 years as that is

their maximum operating life.

3.4 CIRCUIT POLYSWITCHES AND FUSING

A 1 Amp AC fuse is on the board together with a 2.5 Amp DC Polyswitch for the BPS series.
The AC fuse is on the hot 120 VAC input and protects against a transformer intern al short. A
short 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. Additionally, if batteries are used, they will switch into the short when the
power supply shuts down and will supply a tremendous amount of curr ent into a short which is
easily capable of melting wire insulation. 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 breaker. If it receives an overload, it rapidly cuts the current down to a
small leakage current (about 100 mA). If this happens there is a reset procedure. All
current must be removed from the Polyswitch for a period of 10 seconds. You do this by
simply disconnecting the wire from the “+” or “-” terminal. If, for example, a short circuit
appeared which tripped the Polyswitch and you corrected the short but did not disconnect the
wire from the “-” terminal, the Polyswitch would “see” the normal load and would continue to
block current flow until reset in the manner just described.

PN# 500-10100
Page 2 Rev. D, 06/11