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To provide protection set values for these parameters at 2C01
Over voltage start cutback: the value at which the braking effort is linearly reduced to limit
voltage increase.
Over voltage limit: the value at which the controller cut-outs out. A fault is set if the voltage
exceeds the cut-out voltage.
Under voltage
To prevent excessive battery discharge, set values for these parameters at 2C02
Under voltage start cutback: the value at which the current drawn from the battery is
reduced to limit voltage decrease.
Under voltage limit: the value at which the controller cut-outs out. A fault is set if the voltage
drops below the cut-out voltage for longer than the protection delay
Protection delay: the time it takes for the controller to cut-out after the under voltage limit
has been reached (2C03h).
Battery Discharge Indicator (BDI)
Monitor battery voltage using Gen4's Battery Discharge Indicator (BDI). The BDI presents the
driver with a percentage remaining charge figure and has become an industry standard in recent
years.
NOTE: The BDI is not a measure of the absolute battery charge remaining and therefore we
recommend you regularly check the absolute value in accordance with the battery
manufacturer's instructions.
To use the BDI, configure the following parameters at 2C30
Cell count: this is the number of battery cells and is normally half the battery voltage, as
cells are usually 2 volts each.
Reset voltage (V): set this to the cell voltage when the batteries have just been charged.
This resets the BDI back to 100%.
Discharge voltage (V): set this to the cell voltage when the battery is discharged.
Cut-out level (%): this is the level at which the vehicle adopts the low battery drivability
profile.
Discharge rate (s/%): this is the rate at which the BDI remaining charge value discharges.
Set to 0 to use default value of 16.8s to reduce by 1%. This default should suit most lead-
acid battery types, however, this can be increased/decreased for different battery
technologies.
NOTE: Setting the warning and cut-out levels to 0% disables the warning and cut-out
functionality
An additional table exists at index 2C31
up based on the measured battery voltage. At start up, the measured battery voltage is taken,
and the corresponding BDI percentage remaining value is then used as the starting point for the
BDI. After this, the BDI remaining value operates in the standard way. Note, this function is only
available if the corresponding bit is set in object 2C30
Read the percentage remaining charge value from 2790
6-38
in the Object Dictionary:
h
which allows an initial BDI value to be specified at start
h
sub 1.
h
sub-index 1 in the Object Dictionary.
h
:
h
:
h
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