Page 114/169 AFNZPxxx – DUALACE2 NEW GENERATION – User Manual
Main contactor output behavior.
9.11 Battery-charge detection
During operating condition, the battery-charge detection makes use of two
parameters that specify the full-charge voltage (100%) and the discharged-
battery voltage (10%): BAT.MAX.ADJ and BAT.MIN.ADJ.
It is possible to adapt the battery-charge detection to your specific battery by
changing the above two settings (e.g. if the battery-discharge detection occurs
when the battery is not totally discharged, it is necessary to reduce
BAT.MIN.ADJ).
Moreover, BDI ADJ STARTUP adjusts the level of the battery charge table at the
start-up, in order to evaluate the battery charge at key-on. The minimum variation
of the battery charge that can be detected depends on the BDI RESET
parameter.
The battery-charge detection works as the following procedure.
Start-up
1) The battery voltage is read from key input when the battery current is
zero, which is when the output power stage is not driven. It is evaluated
as the average value over a window of time, hereafter addressed as
Vbatt.
2) Vbatt is compared with a threshold value which comes as function of the
actual charge percentage; by this comparison a new charge percentage is
obtained.
3) The threshold value can be changed with the BDI ADJ STARTUP
parameter.
4) If the new charge percentage is within the range “last percentage (last
value stored in EEPROM) ± BDI RESET” it is discarded; otherwise charge
percentage is updated with the new value.
Operating condition
Measure of the battery voltage, together with the charge percentage at the time of
the voltage sampling, give information about the instantaneous battery current.
1) The battery voltage is read when the battery current is not zero, which is
when the output power stage is driven. Vbatt is evaluated as the average
value over a window of time.
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