Aritech ATS4000 Instrukcja Obsługi Pobierz pdf (Strona 27)

ATS Designers Guide 27

2 SYSTEM POWER SUPPLY.

In every security system, the power supply design is an essential part. Providing the

equipment with adequate working conditions in critical situations is vital for building

security. Below are some of the critical aspects of the power supply problem, pertaining

to system design:

• Power supply efficiency;

• Backup power – batteries and their recharging;

• Power requirements of the equipment;

• Power transmission losses;

• Shielding and grounding.

Due to the area covered, and projected flexibility the Advisor MASTER system offers a

distributed power supply system. The control panels, as well as the DGP (alarm and

access control) are equipped with a switched mode power supply with current draw

ranging from 2.2A to 4.5A (13.8V DC). Each device is designed to provide backup power,

and to supply equipment connected directly, or through the system bus. This ensures the

alarm system is constantly supplied from a local power source, connected to the central

unit only through the data bus.

Each ATS system power supply is equipped with a backup power system. The batteries

are charged from the main power supply. Because of that, it is necessary to secure a

proper margin of power supply current draw to enable recharging of the batteries

appropriately fast enough for system security level.

A unique feature about the ATS equipment is verification of not only the presence of a

battery, but also its condition. During the battery test, the system switches to battery

power for a while, checking how much power it drains from the battery (it measures the

voltage drop, current and time). After restoring the mains power supply, the system

verifies the amount of energy necessary to restore the battery to its starting state

(measuring the voltage, current and time). Based on the gathered data, the system

verifies battery life and, if necessary, sends an appropriate service report. The event log

will of course contain the appropriate entries.

Another feature of the Advisor MASTER system power supply is a battery deep discharge

protection, which ensures the batteries do not get broken by complete discharge. During

a longer period of operating on battery power, if the supplied voltage drops below a

certain level, the system goes into a suspended state after sending the appropriate

reports to a SMA station and logging the appropriate entries in the event log. When the

main power supply becomes available again, the system will restore itself to full

functionality, send the appropriate reports to the SMA station and log the appropriate

entries in the event log.

2.1 System power supply

The system power supplies are available in the control panels, the ATS1201/03 basic

system DGP and ATS1250 Access control DGP. The use of a system power supply is

recommended whenever possible, due to the advanced power supply monitoring

functions and the capability of testing the batteries. The power requirement data for the

equipment does not include the power requirements for expansions and other system

devices connected to them. The average values are given for equipment in stand-by

mode – normal zones state etc. The peak values pertain to the system in alarm state –

shorted zones, increased data bus communications etc. but do not include power

requirements for signal outputs, and other devices supplied by the system. The power

supply design should provide adequate supply for those devices. To simplify the definition

of power requirements, the following lists have been assembled:

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Aritech ATS4000 Instrukcja Obsługi Strona 27

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