English
The Foxtrot system and the CIB buses are powered by 24 VDC or 27.2 VDC (in case of a battery backup). Tolerance limits of supply voltage are given in Chapter 3.1.1 CIB bus characteristics.
The power supply parameters:
We recommend to use the power sources specified in this documentation. If necessary, other sources can also be used to power the system. Most sources with stabilized voltage output of 27.2 VDC or 24 VDC usually meet the requirements. The power supply used must meet the conditions of SELV, the 27 V source must be specifically designed for direct battery charging. You can also use a non-stabilized 24 VDC (without a backup), but you must be careful about the output voltage (with markedly excessive power supply, the output voltage can rise above the permitted value).
Determination of the power source output:
The power supply alone (without the CIB buses) of the CP-1000 can utilize a supply with the power output of min. 15 W (we recommend the DR-15-24). If other circuits are also powered from the same source, its power output must be proportionately increased. Regarding the power supply to the central module and both CIB buses (see Chap.2.2.1.Power supply without a backup) we recommend the DR-60-24 or the DR-100-24 sources, and as to the power supply from a backup battery we recommend the PS2-60/27 supply (see Chap.2.2.2.Power supply with a backup).
Protection of power supply:
The power supply input (27 V + terminal) is protected by an internal electronic fuse. We recommend to install upstream from the power supply a front-end external fuse with a recommended nominal value of T3 15L250V (for the central CP-10x0 module and both fully fitted CIB buses).
SELV:
If the power supply meets the parameters of the SELV source in accordance with the EN 60 950 (ČSN 33 2000-4-41) standard, then all I/O circuits of the system meet the SELV requirements. This also applies if the relay outputs switch low voltage circuits (the isolation of relay outputs from the internal circuits of the system is 4 kVAC). The power sources required by the Foxtrot system meet the SELV parameters.
Increasing the endurance of the power sources:
In order to ensure trouble-free operation even in emergency situations (the effects of a lightning strike, generally poor
quality of the power grid or influence of other devices with negative impact on the grid) it is recommended to install a suitable surge protection equipment at the 230 VAC power supply (see the examples of connections in Chapter 13.5. Surge Protection.