Manual Voltcraft ALC 8500 EXPERT (page 19 of 29) (English)

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12.4.5 Refresh

The Refresh function of the ALC 8500-2 Expert is primarily intended for use with defective or damaged

batteries, most of which can be re-used after subjecting them to this program. This applies in parti-

cular to deep-discharged batteries, and packs stored for a long time, but also to batteries which ex-

hibit a cell short, all of which are often usable again after this process has been completed.

The program starts by checking whether a voltage is present in the battery or not; it then discharges

it for a while before subjecting it to powerful pulses of current. If you have a battery with a shorted cell,

the “Refresh” function is best carried out at channel 1 or 2, as higher current pulses are available at

these outputs. After this the ALC 8500-2 Expert automatically carries out three charge / discharge

cycles.

The ﬁrst of these charge cycles is carried out at a current corresponding to 10% of the previously

entered nominal capacity. Since the charge process of a battery previously damaged in this way often

fails to exhibit the typical curve, the Delta-V cut-off point detection is switched off for the ﬁrst charge

cycle. Since a timer-controlled charge now takes place, it is clearly important that you enter the correct

nominal capacity beforehand.

The two subsequent charge cycles are carried out with the charge / discharge currents corresponding

to 50% of the battery’s nominal capacity, with the Delta-V cut-off point detection re-activated.

At the conclusion of the last charge process the battery is fed a trickle current to keep it in the fully

charged state.

12.4.6 Cycle

Batteries which have not been used for a long period are generally incapable of delivering their full

capacity. The primary purpose of the “Cycle” (regeneration) function is to revive batteries in this state.

The program automatically repeats the charge / discharge cycle using the pre-set charge and dischar-

ge currents until it detects no increase in capacity. When the cycle program has ﬁnished, the screen

displays the last value for charged-in capacity, and then switches over automatically to a trickle char-

ge which compensates for energy loss through self-discharge.

12.4.7 Forming (balancing)

New batteries are not capable of providing their full performance from the very ﬁrst charge cycle. For

this reason the ALC 8500-2 Expert can be set to give a new pack a conﬁgurable number of initial

charge / discharge cycles in order to bring it up to maximum capacity. The basic rule is that batteries

are formed, or balanced, by charging them at reduced current; the charge rates available are those

shown in Fig. 20. After the second charge process the program switches from the forming current to

the set charge and discharge currents, but with a maximum of 1C.

12.4.8 Maintain

The “Maintain” function is intended for any battery which is not to be used for a long period, but

whose full performance must be available when required. This function gives NC and NiMH batteries

a full charge, after which a trickle charge is applied to compensate for capacity losses caused by

self-discharging; this is the same process as a normal charge. However, the “Maintain” function au-

tomatically discharges the pack to the ﬁnal discharge voltage once a week. In the case of lead-acid

batteries 10% of the nominal capacity is removed from it once a week, and then charged back in

again. Used in conjunction with the lead-acid activator function, this program constitutes a highly

efﬁcient means of preventing hardening and passivation of the lead plates. Naturally, the pre-set ﬁnal

discharge voltage is taken into account during the discharge process.

Fig. 20: Selecting the forming

current on the ALC 8500-2

Expert

C/10 C/5 C/3 C/2

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