P.T. SECURITY TECHNOLOGY CO., LTD.
LOCATION: OTHER PRODUCT > Power Supply Unit > Fire Alarm Power Supply
Fire Alarm Power Supply

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The series of PSU-15/ PSU-20/ PSU-30/ PSU-45/PSU-60 (hereinafter called the PSUs) are DC24V UPS (Uninterrupted Power Supply) equipment with large output capacity to provide power uninterruptedly. These products have been designed to meet different requirements, can deliver 15A , 20A , 30A , 45A, 60A respectively. There is a 50AH standby battery setting in the PSU, a external battery higher than 50AH can be connected too. The PSUs apply AC commercial power as their primary power and battery as standby power. In case of commercial AC power cut, the PSU series can seamless switch to standby power supply automatically.

I General

eries of PSU-5/ PSU-10/ PSU-20/PSU-30/PSU-45/PSU-60 (hereinaftercalledthePSUs)are DC24V UPS (Uninterrupted Power Supply) equipmentwithlarge output capacity to provide power uninterruptedly. These products have been designed to meetdifferent requirements, candeliver 5A, 10A, 20A , 30A , 45A, 60A respectively. There is a50AH standbybatterysetting in thePSU,a external battery higherthan 50AHcan be connected too. The PSUs apply AC commercialpower as their primary power and battery as standbypower.Incase of commercial AC power cut,thePSUseriescan seamless switch tostandbypowersupplyautomatically.

II Technical specification

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I General

The series of PNC-20/ PNC-30/ PNC-45/PNC-60 (hereinafter called the PNCs) are DC24V UPS (Uninterrupted Power Supply) equipment with large output capacity to provide power uninterruptedly. These products have been designed to meet different requirements, can deliver 20A , 30A , 45A, 60A respectively. There is a 50AH standby battery setting in the PNC, a external battery higher than 50AH can be connected too. The PNCs apply AC commercial power as their primary power and battery as standby power. In case of commercial AC power cut, the PNC series can seamless switch to standby power supply automatically.

II Technical Specifications

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III Introduction of Operation Principle

The commercial power is at firstapplied viathe AC input terminals ofpower supply module, and then converted intoDC24Vtocharge standby batteryand power load by theblocksof PFC(Power Factor Correction) and DC/DC converter. The system of PSU series charges the battery with constant voltage and constant current;i.e. when the batteryis undercharged, thesystemchargesit with constant current, when the battery is fully charged,thesystem switches overto the output mode of constant voltage. There is ainternal CPUin the system,it can monitor and indicate value of AC in put voltage,D C output voltage, output current, charge current and approximate charge capacity of the internal battery.Figuure1 illustrates the principle block diagram of the PSU series.

1. Either set ≦50AHstandby batteryin the PSUs, or equipexternal50~200AHbattery.

2. The PSUsdisplay voltageand current digitally by CPU. Bothof theCPUandhardware detect the limits of voltage and current and will alarm when the limits are exceeded. Thehardware controls chargeand switchover between primary andstandby power supplies, ensuring death ofCPU doesn't affect operation of thesystemcontrolling circuit.

3. When commercialAC power and the PSUs operatenormally,the PSUs charge standby batteryandpower output load. Whencommercial ACpoweris cutor the PSUs fail, the standby power supplycan power external equipmentautomatically,completing the seamlessswitchover between primary and standby power supply truly.

4. Air Circuit Breaker S1,S2 areconnected in series with the standby power supply andtheoutput circuit routeforprotection. When the output load current exceeds its rating,Air Circuit Breaker S1,S2 will provide over current protection to ensure the safety ofoutput circuitry.
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Figuure1. Principle block diagram of PSUs System

IV System Functions
(1) Standby Power Supply Management

1) Battery Charge Mode: Floating charge with constantvoltageand constant current, charge voltage is27.4V,normally charging by the NormalChargeCurrent. If needboostcharge,user canuse keyoperation to obtain a highchargecurrent. But the output current will beless atthat time.When userselects Boost Charge Current, after battery is fully charged, the system willreturn to the state of normalcharge current.

2) Switchoverbetween the primary andstandby power supply:Whenthe voltage of standby powersupply is not lower than21V, if the primary commercial ACpowercut, the systemcan seamless switchover to the standby power supply automatically. After the primary ACpower resumes,the system canseamless switch over to the primary power supplyautomatically and charge standby battery

3) Overdischarge protection: When the standby battery discharge to 20V-21V, the system willdisconnect load from the battery toprotectthe standby power supply. The CPU display willworkcontinuously, until the battery voltage drops to 19V-20V.When the battery voltage is 19V-20V, thedisplay does not work and the quiescentcurrentofthe whole system is lessthan 10mA.

(2) Protective Functions1) Output Over-voltage Protection: When the outputvoltageexceeds30V, theoutput over-voltageprotection takeseffect.

2) Over-current Protection: When the outputcurrent exceeds over-currentprotecting point, the outputover-current protectiontakes effect, the output Air CircuitBreakerwilltripandpower supply systemsend an alarm.

3) InputUnder-voltage Protection: Wheninput voltage ofthecommercial ACpower is less than AC190V,the primary power supply is turned off and the standby power supply will power the load.

4)Over-temperature Protection:When the temperature of the internal heat sink exceeds 90°C, theOver-temperature protection takes effect and turn the power supplyoff.

V Structure, Dimensions and Installation Requirements

  1. The Mechanical configuration and dimensions of PSU series are shown in Figure 5.
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  2. Figure 5. Mechanical Configuration and Dimensions

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Product features

300Woutput power

2:1 input voltagerange

4.6'' ×2.4''×0.53''

(116.84mm×61mm×13.5mm)standardpackage

Fixe switching frequency

Input under-voltage protection

Output over-current, short circuit protection

Support longtime short-circuitprotection

Strong Capacitiveloadcapacity

Mental aluminum based boardandflame-resistant materialpackage

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Over view

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Pin defination

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HEADQUATER: P.T. Security Technology Co., Ltd.
Address: 31F, Hongfa International Town, 47-2 Shenliaodong Rd, Tiexi District, Shengyang, Liaoning, CHINA
www.ptstec.com
www.ptstec.net

EXPORT BASE: Beijing P.T. Security Technology Co., Ltd.
Address: Room 517, Shougang Dichan Building, Chaoyang District, Beijing 100013, CHINA
Zip code: 100013
Tel: +86-10-57013499
Email: sales@ptstec.com

PRODUCTION BASE: Shengyang P.T. Security Technology CO., Ltd.
Address: Tongjiayu Village, Zhujia Town, Dongling District, Shengyang, Liaoning, CHINA