18.7 Error messages
The ALC 8500-2 Expert incorporates a comprehensive set of safety functions, and automatically halts
the current process if any important parameter strays outside the permissible range.
After an automatic forced shut-down the screen displays an exclamation mark (“!”) in the overall view
(main window).
If this happens, use the arrow buttons to switch to the appropriate charge channel, and you will see
an indication of the reason for the enforced shut-down in the bottom half of the screen. The meaning
of the on-screen messages is as follows:
Trans.hot: The temperature of the mains transformer is too high; all charge channels are switched
off.
Heats.hot: The temperature of the heatsink is too high; all charge / discharge channels are switched
off.
Bat.hot: The external temperature sensor has registered a battery temperature outside the per-
missible range.
Overvolt: The battery voltage is too high, or has been set incorrectly.
Alternatively the connection between the charger and the battery may have been inter-
rupted.
Overcap: The dU detect circuit has not tripped even though a charge factor of 1.6 has been reached.
This may mean that you have entered the wrong nominal battery capacity. If you set too
low a charge current with an NC or NiMH battery, it is likely that no detectable dU effect
will be generated. However, “overcharging” the pack at such low currents usually does
no harm.
Low Volt.: The charger cannot detect an adequate battery voltage. It may be that you have set the
nominal battery voltage incorrectly, or the battery maybe defective.
I=0 Fuse?: The fuse of the corresponding charge / discharge channel has blown.
