elv ALC 7000 Operating Instructions Manual page 33

Batteries stored for a long time or damaged generally have a considerable loss
of capacity and do not reach their set capacity even after undergoing several
charging cycles. The „Cycle" regeneration program repeats successive char-
ge/discharge cycles until the charging unit can no longer detect a capacity increa-
se.
- Select the „Cycle" function using the „Function" key (refer to the diagram). This
function is represented in the display by the circle-arrow symbol.
- The cycle is started by pressing the „Start" key.
- When the program is completed, the maximum capacity appears in the
display.
- The pulse trickle charge is then supplied automatically to compensate for loss
of charge by self-discharge. After the charging process and transition to trickle
charge is completed, the corresponding channel LED flashes.
LC display indicators in cycle mode:
Example illustrates discharging
Selected channel
Battery symbol
Symbol for
cycle mode
7.6. Test
The „Test" function serves to measure the battery capacity. Normally, the battery
capacity measurement is performed under nominal conditions, because the
amount of energy which can be drawn from a battery is partly dependent on the
respective discharge current. In the case of NC cells, it is often the case that the
valid capacity specification for a charge voltage is 20% of the nominal capacity
specification (C/5). This means, for example, that a 1 Ah battery must be
discharged with a current of 200 mA.
In order to establish the capacity, the battery is initially fully charged. Discharging
then follows at the previously set nominal conditions with continuous measure-
ment until reaching the end discharge voltage.
- Select the „Test" function using the „Function" key (refer to the diagram). This
Spannung
Kanal
Strom
Kapazität
Current process indicator, here
discharging; arrow pointing to left:
charging.
V
Current cell voltage
mA
Actual current, here
discharge current
mAh
Discharged capacity
in current or last
discharge process
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