SARGENT 737 User Manual

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 sufcient 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

CURRENT DRAIN

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.

Reproductions in whole or in part without express written permission of Sargent Manufacturing Company is prohibited.

800-810-WIRE (9473) • www.sargentlock.com • A7840B

02/26/09

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

3.4 EMERGENCY RELEASE

Factory setting is 12 volts for 12 volt unit and 24 volts for the 24 V unit. Emergency

Note: Connect DC+ load to F terminal when

adding switch for emergency release.

release of DC output at the power supply is accomplished by using the unconnected “F” terminal. Connect the contacts of the release switch between “DC+” and “F” and then connect the load to “DC-” and “F”. When the emergency release contacts open, all DC

TB2

DC- DC+

power will be cut off. When used with a UL listed re alarm system, use auxiliary latching normally closed contacts.

Note: Do not use “trouble” contacts (Fig. 2). * A trouble contact is a contact closure that comes from the re panel. A trouble contact is energized when a re panel experiences an integrity issue either internal to the panel or wiring to the panel.

3.5 CIRCUIT POLYSWITCHES AND FUSING

Load

Fig. 1 Load Wiring and

Emergency Switch Contact

N/C

Normally

Closed Switch

The power supplies have a 1 Amp AC Line Voltage Fuse and a 2.5 Amp DC Polyswitch. The AC fuse is on the hot 120 VAC input and protects against a transformer internal short. A short in the DC load will not blow the AC fuse as the power supply is short-circuit protected. The unit will shut off, if more than its rated output is attempted to be drawn.

115 VAC Input

A DC short will not damage the power supply, but 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 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 loads must be removed from the Polyswitch for a period of 10 seconds. This is accomplished by simply disconnecting the load wiring from the ”DC+” or “DC-” terminal. A short

Line Voltage

Fuse (1AMP)

G H

Fuse

Hot

Neutral

Ground

circuit condition must be corrected in order for the Polyswitch to reset.

Connector to

“Power On” LED

Voltage

Adjustment

Low Voltage AC

From Transformer

DC (-)

DC (+) Unconnected Terminal

For Switch Connection

2.5 AMP Polyswitch Breaker

Optional

Battery Pack

3.6 ADDING BATTERIES TO A 3500 SERIES POWER SUPPLY

To connect batteries, follow these directions:

1. Install batteries as shown (Fig. 3).

2. The voltage adjustment potentiometer V.ADJ (Fig. 2) must be set without the batteries connected. The voltage should be read at the ying leads of the battery connection.

3. Set the voltage output by rotating the V. ADJ potentiometer on the power supply module to 13.5 volts for 12 volt supplies; and 27 volts for 24 volt supplies (Fig. 2).

4. IMPORTANT: Cutting and removing the WARNING label is necessary to make connection and indicates understanding and acceptance of the conditions and settings necessary for proper operation.

5. Connect the black ying lead to battery negative (-) and the red ying lead to

Reproductions in whole or in part without express written permission of Sargent Manufacturing Company is prohibited.

02/26/09

800-810-WIRE (9473) • www.sargentlock.com • A7840B

battery positive (+) (Fig. 2).

Fig. 3 Power Supply With Batteries Installed

SARGENT 737 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual