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SAFT ELECTRIC STORAGE BATTERY Gulfstream Aerospace P/N ...

SAFT ELECTRIC STORAGE BATTERY Gulfstream Aerospace P/N ...

SAFT

SAFT AMERICA INC. Component Maintenance Manual 1159SCAV519-1 NOTE: After charging a discharged battery for 5 min., and some or all of the individual cell voltages indicate greater than 1.5 V D.C. [see para. B. (3)] add 10 to 15 cm 3 of distilled water to these cells. The high voltage reading may be a result of being dry. When this can be foreseen, it is advisable to check the voltages of each cell at the beginning of the charging operation. During charge, and particularly near the end of the charging period, a production of foam may occur. This phenomenon is generally due to: the presence of greasy matter inside the cell (for instance, grease or oil which could have accidentally ingressed through the valve clearing hole), excessive reduction of the specific gravity of the free electrolyte above the plates. This can happen particularly when distilled water is added to a cell having consumed all (or even more than) its content of water reserve. In this case, it is necessary to add a large volume of distilled water, which does not immediately mix with the concentrated electrolyte remaining in the cell. To stop this phenomenon, it is generally sufficient to interrupt the charging operation and to perform a discharge allowing the electrolyte to mix. The next charging operation will further improve electrolyte dispersion and the phenomenon should then disappear. In the case where the foam is formed by the contact with greasy matter inside the cell, practically nothing can be done except preventing the foam from spreading over the covers and flowing between the cells. This can easily be performed by fitting a water-absorbent cotton pad in place of the valve. (b) Slow-rate low-current charging For a new battery or after removing a discharged battery from storage; charge the battery at 5.3 amps constant current for 10-12 hours to obtain 30 V D. C. As measured across the terminals, then continue with the same rate 24-34-01 PAGE 104 AUG 30/96

SAFT AMERICA INC. Component Maintenance Manual 1159SCAV519-1 5.3 A for 4 additional hours. Charging can be performed in two periods provided that the first period lasts at least 8 hours. Do not interrupt the charging operation for the last 5 hr. (to ensure normal topping up of the electrolyte levels). (c) Fast-rate charging (discharged battery) This charging operation is performed at two successive regulated current rates : First method First charge at 26.5 A up to 32.5 V D.C. (2 hr.40 min. maximum depending on the actual capacity of the battery), then charge at 5.3 A for 4 hr. (the voltage is then about 35 V D.C.) Second method First charge at 53 A up to 32.9 V D.C. (1 hr. 15 min. max. depending on the actual capacity of the battery), then charge at 5.3 A for 4 hr. (the voltage is then about 35 V D.C.). NOTE: The high current phase is limited by the voltage, in order not to overload (or underload) batteries with excessively different capacities and to completely charge the battery in about 6 hr. (d) Charging a battery whose charge is unknown Applicable when a complement of charge is needed, or if the battery has not been used for a period of less than 2 months, if it is not possible to perform complete recycling : charge at 5.3 A until the voltage reaches 32.5 24-34-01 PAGE 105 AUG 30/96

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