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4.2 Selection of power supply units
When components of the Gas Safety System are to be connected to the system bus of the Teta Bus type,
parameters of power supply voltage can be determined by means of the dedicated software Teta System
Configurator.
That software tool enables easy and quick configuration of the system with
selection of input voltage and power of a power supply unit, cross-sections of all
cables and conductors as well as verification of distances between individual
components of the system.
The software description and download guidelines can be found on our website
http://conf.atestgaz.pl/TetaGasConfigurator/index.html?lang=en
In case of systems where equipment of the Teta series is to be connected directly to a control unit, the
power necessary to supply the system shall be calculated as a sum of power consumed by Teta devices (can
be calculated by means of the aforementioned software tool) and other components of the system (see
Section 4.2.2).
Parameters of a newly designed system can be estimated according to guidelines provided in subsequent
items of this section.
4.2.1 Types of power supply units
Firstly the power voltage required for specific detectors must be established according to guidelines
provided in Table 3 to select then the necessary type of a power supply unit.
Power voltage for detectors can be found out by means of the dedicated software tool. The selection
between 24 V DC or 48 V DC can be made with consideration of a distance between the control unit and the
first gas detector, the closest to the controller, and the bus cable cross-section. Although, the rule of thumb
says that the voltage of 48 V DC is mode beneficial for system with a substantial number of detectors for
flammable gases.
System options Power voltage
required for
detectors
Warning LED displays or
sound and light warning
beacons for 24 V DC
Power supply unit suitable for the application
No backup
voltage facilities 24 V - 24 V
48 V NO 48 V or 24 V with the DC/DC voltage doubler (UP 300
24/48 V)
YES 24 V with the DC/DC voltage doubler
(UP 300 24/48 V)
System with
backup voltage 24 V - 24 V + UPS
48 V - 24 V + UPS + the DC/DC voltage doubler
(UP 300 24/48 V)
Table 3: Selection of a power supply type
4.2.2
Output power
The power supply unit selected for the system must deliver sufficient power to cover power consumption of
all measurement points. The demand for power consumption of specific detectors can be found in relevant
user manuals for these devices.
To calculate the overall power necessary to cover the system demand the consumption of all system devices
must be added up and then doubled.
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User Manual: POD-047-ENG R03