Valid from serial number T-code
713962- 403-414, 669-671, 716-718
Order number Date
218920-040 2005-06-01
© BT Europe AB Service Manual REFLEX RR B/E, RR B/E CC 38- 11
Battery charger – 8340
Functional description
Changing parameters
The parameter values can be changed if necessary.
Example: The charger is programmed for battery 2500 Ah, and you
require 300
Ah.
• Press * 200 *, the display shows 250.
• Press, * 2451 * 300 * within 10 seconds.
• Do not forget to copy-over, * 22 * 2451 *, when all the changes have
been made.
38.3.10 Acid circulation
General
Under normal charging the recharging factor is 1.15–1.20, i.e. when the
recharged amount is equal to that withdrawn from the battery a further
15–20% Ah will be charged. This “over charging“ is necessary, firstly to
avoid sulphating, and secondly through gassing to mix the electrolyte
so that electrolyte of a greater density does not collect at the bottom of
the cells resulting in corrosion.
If it possible to mechanically mix the electrolyte, the recharging factor
can be lowered to 1.05–1.07. This makes it possible to save charging
time, maintenance and reduce liquid consumption due to gassing.
One way to achieve this is to blow air into the battery cells and in doing
so cause the electrolyte to circulate.
To charge acid circulation batteries either requires a charger or battery
equipped with an air pump, a.k.a. acid circulation pump.
BTM with acid circulation
There are two systems for acid circulation available for BTM.
Pump type APE or VPM, which is a surface mounted system available
in different sizes depending on the number of battery cells. The small
-
est model gives 200l/h and is used for up to 12 cells. Use the next size
up for a greater number of cells, this gives 350l/h. Both types are com
-
patible with all BTM models irrespective of the enclosure.
Some batteries require a higher volume of air. Accordingly, there are
two other models of which the largest gives 600l air per hour.
There is also an integrated model API, which is solely used in a floor
cabinet.
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