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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: Clean the valves (see "Cleaning", para.1) while the levels are being adjusted. Leave the cells unplugged for as short as time as possible. CAUTION: NEVER USE ACID OR A SOLUTION OF ACID AND WATER TO ADJUST CELL LEVELS IN NICKEL-CADMIUM BATTERIES. ANY TRACE OF ACID, HOWEVER SMALL, WILL PERMANENTLY DAMAGE THE BATTERY. ONLY USE EQUIPMENT WHICH HAS NEVER BEEN USED FOR LEAD BATTERIES. AVOID USING CHEMICALLY PURIFIED WATER WHICH CONTAINS ACID OR CHLORINATED ELEMENTS. (4) Checking the thermostat for operation (see "Inspection"). (5) Capacity check (a) Discharge Within 24 hours after charging and topping up the level, discharge the battery down to 1 volts per cell [see para. (2) (a) ]. Note the discharge duration and the time when some cells drop below 1 V D.C. Stop discharging when reaching 21 V D.C. across the battery terminals. Conclusions to be drawn from the above test : the battery is correct if the duration of the first discharge of the battery [see para. (2) (a) ]. is greater than 30 min. If using the discharge current of C1 or 60 min. if using the discharge current of 0.5C1, and the duration the second discharge is at least equal to 1 hr. 100% charge using C1 or 122 min. using 0.5C1, if the duration of the first discharge is less than 30 min. using the discharge current of C1 or 60 min. using the discharge of 0.5C1, and the duration of the second discharge is correct (1 hr. at C1 or 122 min. at 0.5C1, minimum), the condition of the battery is correct, but it is not completely charged and the operating conditions should be checked, if some cells remain shorted during discharge, discard them. 24-34-01 PAGE 110 AUG 30/96

SAFT AMERICA INC. Component Maintenance Manual 1159SCAV519-1 if the duration of the second discharge is less than 1 hr. At C1 (less than 122 min. At 0.5C1), or if the voltage of some cells is less than 1 V D.C. within 1 hour of discharge (122 min. At 0.5C1 ), the battery should undergo a more complete overhaul. Perform the complementary checks [see para. (b)]. (b) Complementary checks The capacity supplied by the battery is : 53 A • number of minutes before 21 V D.C. / 60 = Number of Ampere-hours (Ah), or divide by 122 if using 0.5C1 If the capacity is not greater than 53 Ah, or if the voltage of each cell rises too quickly during charging, drops, or is excessively low at the end of charge, some cells may have been insufficiently balanced, the volume of added water is insufficient, or the cell separators are damaged. Repeat the balancing operations more accurately by discharging at 10 A. Meanwhile, regularly measure and note the voltage of each cell, observing the sequence of measurement. Locate and shunt the cells whose voltage drops below 1 to 0.9 V D.C. using a 1-ohm (10 W) resistor. Stop discharging at the latest when the voltage reaches 10 V across the battery terminals. Keep the shunts in place as described in paragraph (2) (b). Repeat the remaining operations: slow-rate charging [see para. A. (2) (b)], checking the levels [see para. (3) (b)] and a new test discharge [see para (a)]. Regularly check the voltage of each cell during the first and last hour of charging. At the end of this test, discard the following cells whose operation is defective: cells not reaching 1.2 V D.C. after 5 min. Charging, 24-34-01 PAGE 111 AUG 30/96

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