26.03.2013 Views

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

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

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

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

<strong>SAFT</strong> AMERICA INC.<br />

Component Maintenance Manual<br />

1159SCAV519-1<br />

NOTE: After charging a discharged battery for 5 min., and some or all of the<br />

individual cell voltages indicate greater than 1.5 V D.C. [see para. B.<br />

(3)] add 10 to 15 cm 3 of distilled water to these cells. The high<br />

voltage reading may be a result of being dry.<br />

When this can be foreseen, it is advisable to check the voltages of<br />

each cell at the beginning of the charging operation.<br />

During charge, and particularly near the end of the charging period, a<br />

production of foam may occur. This phenomenon is generally due to:<br />

the presence of greasy matter inside the cell (for instance, grease<br />

or oil which could have accidentally ingressed through the valve<br />

clearing hole),<br />

excessive reduction of the specific gravity of the free electrolyte<br />

above the plates. This can happen particularly when distilled water<br />

is added to a cell having consumed all (or even more than) its<br />

content of water reserve. In this case, it is necessary to add a<br />

large volume of distilled water, which does not immediately mix<br />

with the concentrated electrolyte remaining in the cell.<br />

To stop this phenomenon, it is generally sufficient to interrupt the<br />

charging operation and to perform a discharge allowing the electrolyte<br />

to mix. The next charging operation will further improve electrolyte<br />

dispersion and the phenomenon should then disappear.<br />

In the case where the foam is formed by the contact with greasy matter<br />

inside the cell, practically nothing can be done except preventing the<br />

foam from spreading over the covers and flowing between the cells.<br />

This can easily be performed by fitting a water-absorbent cotton pad in<br />

place of the valve.<br />

(b) Slow-rate low-current charging<br />

For a new battery or after removing a discharged battery from storage;<br />

charge the battery at 5.3 amps constant current for 10-12 hours to<br />

obtain 30 V D. C. As measured across the terminals, then continue<br />

with the same rate<br />

24-34-01<br />

PAGE 104<br />

AUG 30/96

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!