Central power system called Central Battery is characterized by the fact that all emergency luminaires are supplied from a single external source. During emergency work luminaires are supplied by the battery of 220VDC, and during normal operation by main voltage 230VAC. The system is designed to power circuits working in IT network with battery operation. It has been designed in accordance with PN-EN 1838, EN 50171, EN 50172 and EN 50272 norms.
Central battery system can consist of a master station and substations. Emergency lighting luminaires can be connected to both master station and substations and arranged in the so-called final circuits with a maximum power of 700W. Communication between the master station and substations is via RS-485 line. In central battery system the control lighting efficiency can be implemented either by controlling the line, or by controlling the luminaires. Communication in this case is performed through power cables.
The system standard construction is a cabinet 19” where following blocks are placed as interchangeable modules:
- UKN module for battery charging and control
- H-505 computer for system supervision and data gathering
- rectifer for battery charging
- USO module - line controler, checks luminaire status (light sources and electronic ballasts)
Accumulators are located in the same cabinet as the electronics, or on an additional rack. Sealed and maintenance free batteries with a life span up to 10 years are used in central battery system. These batteries have low self-discharge and also low gassing. The system employs 18szt. 12V batteries connected in series.
Central battery system may be supplied from one or three phase mains. It depends on the specific requirements of the customer. Maximum allowable power in one cabinet system is 27kW. In such system may be maximum 64 final circuits.
|Emergency mode||IT type electrical network|
|Output voltage||230VAC or 220VDC|
|Circuit control||700W max (1kWoption)|
|Luminaire control|| 20 luminaires with identity modules in circuit|
|Float battery voltage||245V|
Central battery system components
1. Battery charger EPS-700
Charger is made as a module 6U 19” to fit to EuroCard system. Connection with 19”rack is made by H15b connector ensuring hot swap of charger. Applied number of chargers gives redundancy.
Green LED in front panel shows presence of output voltage. Fuses F1 (mains) and F2 (output) are placed inside.
Charger is specially designed to meet requirements of batteries. The module can work independently or number of modules connected in parallel that will increase the output power. For nominal voltage Uo (V) = 245.00 V, max output current is 3A.
Following solutions adopted in EPS-700 battery charger provide:
Limitation of inrush current when turning on the network
soft start when connection to the network (with no overshoot) baseline characteristics of pulsed output current limitation type: constant voltage - constant current
Overvoltage protection 110%-120% output voltage
Potential free contacts for fault detection
Optical signalization of damage
Elimination of inrush battery current when connecting the battery to power supply
Turning on a fan at 30% of load current
Protection against fan failure by limiting output current to 40% of maximum current
Temperature compensated charging voltage in accordance with accumulator manufacturers requirements
Switching on and off power supply remotely
Equal current sharing between modules
2. Changeover module and addressing module
Changeover module is used to control the individual luminaires connected to maintained final circuit by local switches. The module is powered directly by incoming cable from the battery compartment and also by central voltage fed through the connector.
The maximum power of luminaire controlled by the module is 150W. Changeover modules can be installed in luminaires working with maintained lighting mode. There are versions of individual modules or in a set with identity module.
3. USO line and luminaire controller
USO module is designed to measure the efficiency of lighting fixtures forming part of the final circuit. It may consist of up to 12 identical luminaires when testing the efficiency of the line or up to 20 luminaires of any kind with a total capacity not exceeding 700W. Setting the type of line work is done with a computer H-505. One USO module can monitor 2 final circuits.
There are 4 LEDs for every circuit in the front panel:
Green LED indicates "Mains".
Yellow LED indicates "Battery work".
Another green LED indicates activated line.
Red LED indicates circuit fuse failure.
The module has two security lines.
4. Luminaire Identity Module MA-01 (for 12 luminaires) or MA-02 (for 20 luminaires)
Luminaire identity module is used to verify the correctness of the luminaire. Maximum 20 lamps can be in one final circuit. One module can supervise one luminaire. Communication between central battery unit and luminaire is done with the use of power supply line.
Please note that light-sensitive element, located in the module, should be directed towards light source. Luminaire address (1-12) or (1-20) has to be set by a switch located in the module. Luminaire addressing should start from No. 1 in sequence until the last fixture on the line.
5. H-505 computer
H-505 computer is used to collect and store information about system failures for printed reports. The PC has a touch screen display on which system messages are shown. Emergency states are also indicated by a de-energized relay contact. It can be connected to the BMS signaling. Computer through the RS 485 port communicates with computers in substations. It reads and displays the information in the form of text and emergency states.
By default, the computer automatically performs functional tests according to the set schedule. The system parameters can be obtained in hard copy from your computer via USB. Record obtained at the USB connector is a text file and can be printed from any computer. The system stores the results of minimum two years on SD card.