ROBBE ALC 8500-2 Expert Instructions D'utilisation page 33

Table 1: performance data of the ALC 8500-2 Expert
Nominal battery capacity, channels 1 and 2 ................................................. 200 mAh to 200 Ah
Nominal battery capacity, channels 3 and 4 ................................................... 40 mAh to 200 Ah
Charge power, channels 1 and 2 ........................................................................max. 40 VA total
Discharge power, channels 1 and 2 .......................................................max. 40 VA per channel
Charge power, channels 3 and 4 ........................................................................max. 15 VA total
Discharge power, channels 3 and 4 .......................................................max. 15 VA per channel
Charge voltage, channels 1 and 2 .................. 30 V (max. 24 V nominal voltage with NC, NiMH)
Charge voltage, channels 3 and 4 .................. 15 V (max. 12 V nominal voltage with NC, NiMH)
Charge current, channels 1 and 2 ........................................................................... 40 mA to 5 A
Charge current, channels 3 and 4 ............................................................................. 8 mA to 1 A
Max. dissipated power of heat-sink assembly ....................................................................90 VA
a PC connected all the time. The charger's USB interface makes it simple to create a PC connection
and transfer data for subsequent further processing.
The USB port can be used to control the charger from a PC, and it also supplies a means of reading out
the integral data logger. The battery data can then be further processed using the associated PC soft-
ware.
A pack's voltage level under load conditions is an important criterion when assessing the quality of cells
and batteries. However, if a pack is to maintain a high voltage under load, it is also vital that its internal
resistance should be as low as possible. To determine the internal resistance of batteries the ALC 8500-
2 Expert features an integral battery Ri measurement circuit.
A further special feature of the ALC 8500-2 Expert is its integral lead-acid battery activator (reviver)
function, whose purpose is to prevent crystalline sulphate deposits on the lead plates. Crystalline sul-
phate deposits are a particular problem with lead-acid batteries which are stored for long periods, are
seldom used, or are only ever discharged at low currents. The useful life of these batteries can be con-
siderably extended by using the activator function.
A summary of the ALC 8500-2 Expert's most important characteristics and features:
• Four charge channels, for connecting four cells / batteries
• Simultaneous operation on all four channels, even when different functions are selected
• Accurate battery capacity readings; ideal for selecting battery packs
• Charged-in / discharged capacities can be displayed for each battery individually
• Wide range of charge programs for optimum battery care: charge, discharge, discharge /
charge, refresh, cycle, test / capacity measurement, forming (balancing), trickle charge after
main charge
• Support for different battery technologies: NC, NiMH, Lead-Acid, Lead-Gel, Lithium-Ion, Li-
thium-Ion-Polymer
• Lead-acid activator function for elimination of sulphate deposits
• Integral battery Ri measurement circuit
• Integral data logger for recording and storing complete charge / discharge curve proces-
ses
• Data retention if mains supply fails; automatic program start when the mains supply is res-
tored
• USB PC interface for controlling the ALC 8500-2 Expert; also for reading out the data logger
(galvanically isolated)
• Display of cell voltage, charge current, discharge current, charged-in capacity, discharged
capacity
• Integral temperature-controlled cooling fan
• Temperature guard circuits for transformer and output stage
• Future-proof flash technology for firmware updates and upgrades
• Straightforward operation using jog dial and menu control system.
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