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Voltcraft ALC 8500 EXPERT Manual

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When a process is concluded and the function stopped, the data in the flash memory is retained in-
definitely even when the device is switched off, but only until such time as you make changes to the
corresponding charge channel. However, for data retention it is essential that the function be stopped
before you switch the charger off, unless the process has already reached the “trickle charge” state.
If this is not the case, the process would re-start next time mains power is restored or the unit is
switched on, and this would cause the previously stored data to be lost (behaviour as in the case of
mains failure).
At the conclusion of the function, or when it reaches the “trickle charge” state, it is safe to disconnect
the charger and carry it to another location for reading out the data logger (for example, to a PC in
another room).
18 Supplementary notes
18.1 Reversed polarity protection
If a battery is connected to the charge / discharge outputs with reversed polarity, this will usually blow
the fuse for that output stage. The fuse must then be replaced, once you have disconnected the re-
versed-polarity battery from the output. If the current delivered by the battery is not enough to blow
the fuse, the ALC 8500-2 Expert emits a continuous audible alarm until such time as you disconnect
the battery.
18.2 Discharging single cells
When individual cells are discharged at a high current, the maximum current varies according to the
extent to which the voltage of the cell (and therefore also the voltage of the charge channel) falls during
the discharge process. However, this does not result in a capacity error, as the actual measured cur-
rent is used as the basis for calculating the cell’s capacity.
In fact the screen always displays the battery voltage under zero-current conditions; this is always
significantly higher than its voltage under load.
18.3 Automatic cooling fan
The unit contains a temperature-controlled fan which provides accelerated air circulation round the
power electronics for even cooling when multiple charge channels are in use simultaneously running
high-current processes.
The fan is switched on and off automatically, and cannot be controlled manually.
18.4 Output stage fuses
The ALC 8500-2 Expert’s charge / discharge output stages are protected by glass cartridge fuses
which are accessible on the back panel without having to open the case.
Important: if a fuse blows, it must be replaced by a fuse of exactly the same rating and type. Incorrect
fuses offer no protection, and if a fault occurs the result could be serious damage to the charger and
the batteries connected to it.
18.5 Mains fuse
The mains fuse is also available on the back panel and can be replaced without opening the case.
Important: the mains fuse must never be by-passed or replaced with a fuse of a higher rating.
18.6 Temperature sensor
The external temperature sensor is used to monitor the temperature of the battery when it is being
charged at channel 1 using the “Super-fast charge” function. For the system to work properly it is
vital that the sensor makes good thermal contact with the battery!
… 26 …


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