Aritech ATS4000 Servisní příručka stáhnout pdf (Strana 32)

32 ATS Designers Guide

2.3 Wiring.

The proper grounding and isolation of the devices is an important issue in each wide area

system. All the system elements are equipped with a grounding connector, and should be

connected to a common grounding point in the central station via a 2.5mm

wire. The

data bus shield should be connected to common ground on one end only. The data shield

should not under any circumstances be grounded on both ends of the transmitting wire.

The design should plan to include appropriate power supply wiring including a grounding

wire connected to all devices that require it. To separate a part of the system galvanically

the ATS1470 isolating module has to be used, as it provides insulation up to 1.5kV. Using

the module you have to remember that it needs to be connected to system grounding on

the side it’s powered from.

The powering elements further away than 100m from the control panel or a power supply-

equipped DGP, needs to be laid separately from the data bus. Having the power supply

alongside the data bus can lead to voltage dropping below 10.5V which can hamper

system stability. A further limit is the maximum current load (1A) of the power output.

2.4 Connecting other power supplies.

When planning to connect another power supply, you have to ensure the proper

connection to the system grounding and not connect the positive connectors to any other

power supply. The system power supply in emergency situations requires that additional

power sources ensure an adequate supply in case of mains power failure. For systems

with higher security levels, the power supply needs to fulfil certain criteria of back up

power duration and subsequent recharging of the batteries. Examples of calculations can

be found in section 2.1. A further requirement is monitoring the mains power. For that,

you need to provide one alarm zone, which will be activated in case of mains power

failure. Drawing 2-1 shows an example of connecting an external power supply to the

ATS system. A 2A @138V DC power supply with battery backup is used. It is supplied

with a transformer and housing, in which a BS127N(7.2 Ah) or BS130N(10Ah) battery

can be installed. The power supply can also be installed in an empty ATS housing and

use a bigger battery, but the power supply circuit board is not compliant with the ATS

mounting holes standard.

ATS device with a power

supply

Mains power monitoring zone

PG822

BU4

Other devices

Drawing 2-1 Connecting the PG822 power supply to the ATS system.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 82 83

Žádné komentáře

Aritech ATS4000 Servisní příručka Strana 32