SARGENT Battery Packs 737 - Manual

02/26/09
800-810-WIRE (9473) • www.sargentlock.com • A7840B 1
Copyright © 2009, Sargent Manufacturing Company
, an ASSA ABLOY Group company
. All rights reser
ved.
Reproductions in whole or in part without express written permission of Sargent Manufacturing Company is prohibited.
SARGENT 3520 SERIES POWER SUPPLIES
OPERATION AND INSTALLATION INSTRUCTIONS
MODELS: 3520 (24 VOLT); 3521 (12 VOLT) SUPPLIES;
and 737-12 VOLT and 738-24 VOLT BATTERY BACKUP KITS
1. DESCRIPTION
SARGENT Model 3521 is a 12 volt, 1 amp power supply delivered in a single lockable enclosure with the line voltage
connection to be made by screw terminals. Model 3520 is the same unit with 24 volt, 1 amp output. Both units feature
regulated, adjustable power with integral sealed lead acid/gel cell battery charging capability. Both units also meet Class 2
electrical requirements, which means under the National Electrical Code that output wiring need 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: Power supply is shipped without batteries.
2. SAFETY
Line voltage input and the battery output present a high voltage shock hazard. If shorted, the battery output can generate
sufficient heat to ignite some materials. Whenever the unit is powered, either by line voltage or battery, the cover LED is lit.
The supply must only be opened by trained service personnel when the cover LED is on.
Note: Power supplies are shipped without batteries.
3. OPERATING CHARACTERISTICS
3.1 LINE VOLTAGE INPUT
110-120 VAC hot, neutral and earth ground are connected to terminals “H”, “N”, “G” (Fig. 2). The line voltage current drawn
by the power supply module will be approximately 500 mA.
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.
In addition, when the supply is powered by batteries, available current capacity is reduced because some current is used to
charge the batteries. Therefore voltage must be set higher to 13.5 or 27 volts. 900 mA should be considered the maximum
output of a supply when it is 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.
Battery backup is available by ordering a 737-12 Volt or 738-24 Volt Battery Backup Kit.
Note: Dry cell or NICAD batteries must not be used.
When batteries of the appropriate voltage are connected to the red and black battery leads following correct polarity, the
batteries will be charged by the power supply. In the event of a line voltage power failure, the load will automatically transfer
to the batteries. If the normally closed emergency contact opens at the terminals (Fig. 1), battery power will be cut off.
Table 1 Battery Pack Selection (Chart to Determine Size of Battery Back Backup Time Desired)
Minimum Hours of Battery Life Required
MIN 1 HR 2 HR 4 HR UL STD 8 HR 16 HR 24 HR 48 HR 72 HR
150 MA 4 Ah 4 Ah 4 Ah 4 Ah 4 Ah 4 Ah 4 Ah 8 Ah 8 Ah 12 Ah
300 MA 4 Ah 4 Ah 4 Ah 4 Ah 4 Ah 4 Ah 8 Ah 12 Ah 16 Ah N/A
500 MA 4 Ah 4 Ah 4 Ah 4 Ah 4 Ah 8 Ah 12 Ah 16 Ah N/A N/A
750 MA 4 Ah 4 Ah 4 Ah 8 Ah 12 Ah 12 Ah 16 Ah 20 Ah N/A N/A
Notes:
1) “Min” time refers to facilities using an emergency generator where the batteries are only required to operate the system for under 3 minutes until the
generator takes over. Ah refers to ampere hour.
2) UL Standards require 4 hours of battery operation followed by a 24 hour recharge period and then a second four hours of operation
3) Batteries must be sealed lead acid or gel cell type.
4) The chart above is valid when batteries are operating at room temperature, in colder environments, capacity is reduced.
5) Batteries should be replaced after 5 years of use.
The power supply can charge battery packs up to 20 Ah in either 12 or 24V models. Note that certain long backup times are
not achievable with the maximum size of the battery packs (“N/A” appears in Table 1). Use Chart above (Table 1) to calculate
the correct battery pack based on desired backup time and the current drawn by the load.
Note: For proper battery charging; the power supply must be set at 27 volts with a 24 volt system and 13.5 volts in the case
of a 12 volt system.
The power supplies are adjustable and if the voltage is not adjusted accordingly, the batteries will not hold their full capacity
nor their normal operating life, and may be damaged. Refer to Fig. 2 for location of the voltage adjustment ”VOLT ADJ”
potentiometer.
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