Lamar Technologies CA 1550 User Manual

Page 6

Note: Charging old batteries or batteries that have been in a very low state

of charge 4, 6, or 8 volts and/or batteries that have been dead in excess of

24 hours to 30 days or more, should be observed for a possible

temperature rise during charge. See conditioning section IV.

14.

Ampere Hour Meter (16): This provides the precise ampere hours of

charge into the battery, and is an indicator of acceptance of charge. When

used with the tapered current level and time, it is also an indicator of

battery condition. If time, tapered current and ampere hours of charge do

not all approximately coincide, there is a problem with the battery, such

as sulfation, shorted cell or the end of battery life. With tapered battery

(fully charged), ampere hours should be about 110-140% of the ampere

hour rating of the battery, if the battery was initially completely

discharged. See NAVAIR 17-15-BAD-1 manual for details.

12 VOLT LEAD ACID BATTERIES

Procedure is exactly the same as for 24 Volt Batteries, except set voltage to 14.7

Volts.

C. CELL

BALANCING

Battery voltage is the average of the sum of the individual cells.

There are 12 cells in a 24 volt L-A battery, 6 cells in a 12 volt L-A. The internal

cells of the lead acid battery may be imbalanced after charge but it is not possible

to verify this as there is no access to individual cells.

Therefore, a balancing mode procedure for 12 or 24 volt lead acid batteries should

be performed in a Constant Current mode as follows:

At completion of charge at 28.5 volts (or 14.7 V), when the battery has

tapered to low amperes, the battery is charged even though the time is less than as

set.

Note the ampere hours. They should be more than the ampere hour rating

of the battery if the battery was completely discharged when placed on charge. If

the amp hr reading is not higher than the battery amp hr rating, leave on charge

until the end of the time setting. Note: To reset (extend) the time setting for the

same time period as set on the timer without losing the amp hr reading,

quickly toggle the on/off switch to off/reset ,then back to on, one time.( The

amp hr meter has a built-in time delay of approx. 2 seconds). Time may be

increased during operation, but not decreased.