User manual ELECTRO-VOICE 664A DATASHEET

[. . . ] An automatic charging device is required to charge and maintain the battery. It must be able to charge a battery which is discharged to its discharge voltage up to 80% max. The battery capacity must be sufficient to guarantee the fixed alarm duration at the end of the stored energy time. When selecting new batteries, the user should make sure that their capacity is sufficient to compensate the capacity loss due to natural ageing of the batteries during the prescribed service life. 2. [. . . ] Thus all plus and minus lines are protected against excess currect and short. Different line cross-sections for consumers with low and high current can be connected to a battery at the same time, providing that the fuse values of their individual outputs are chosen accordingly. The maximum value of the fuses must not, however, exceed 20 A. The total amount of the currents of all the output fuses in a fuse block must not exceed 50 A. If the fuse values are changed, the current values printed on the units above the fuse switch are to be covered with the enclosed sticky labels. The fuse values for the appropriate plus and minus outputs must always be the same. If any outputs are not used, the fuses are to be removed and and fuse values above the fuse switches are to be covered over with the enclosed blank sticky labels. The output secured with 3 A is intended for connection of the control module DEM 207. The cross-sections of the lines connected must be correctly dimensioned for the fuse value selected. Please note that lines laid in cable channels have a lower permissible current loading due to lower heat dissipation. The following are guidelines for bundled lines Number of lines 2 to 5 6 to 15 16 to 30 Reduction factor 0. 8 0. 7 0. 5 Module type DEM 287 power amp. 400 W with NRS 90 144 Current consumption at Ebat = 24 V Standby rated power rated power -10 dB wert 10 mA 10 mA 10 mA 2. 5 A 3. 5 A 7A 5. 7 A 10. 6 A 19. 7 A Fuse value 7. 5 A 10 A 20 A Table I Fuse values of the battery outputs for connection of power amplifiers Table II shows the maximum currents which can be drawn from the batteries. -- Never use batteries with different capacities, different degree of discharge or a mixture of old and new batteries together. The manufacturing dates should be within one month of each other. -- Batteries should be stored at as low a temperature as possible. If batteries are stored at normal temperatures, additional charging is necessary once every six months. 3. 3 Storage and additional charging During storage the capacity is reduced due to self-discharge. The battery should be stored in a cool, dry place. If the average monthly temperature is between 20°C and 30°C, one additional charging procedure is necessary every 8 months. If the average monthly temperature is less than 20°C, one additional charging procedure is necessary every 12 months. If a stored battery is used, one charging procedure should always be carried out before use. 3. 4 Transport If the battery is transported, it should never be exposed to excessive jolting or knocks. If a battery is connected to a device during transport, it must be secured well and the current circuit must be interuppted. 3. 5 Battery service life Generally speaking, the battery service life in standy parallel operation amounts to 3 - 5 years and approximately 260 cycles at 100% discharge depth or more in cyclic operation. The actual service life is reduced if the appropriate operating conditions are not maintained, (i. e. charging, discharging, working temperature and storage). [. . . ] For the battery of an alarm device this means: quarterly tests and annual malfunction simulations of the operating duration with the consumers. We recommend carrying out the battery capacity test in accordance with DIN 43 539 part 1, whereby the battery manufacturer's instructions are to be observed. Please see section 3. 2 for instructions on how to treat maintenance-free lead accus. 7. Explanation of terms: -- Continuous battery power supply In this mode, the battery is constantly kept in full charge. [. . . ]