DESIGNER’S HANDBOOK 4189350049C EN
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The high-voltage input can be pre-configured as
a “V
ref
potentiometer input” type; this means that the input data is
measured relative to the actual measured reference voltage. This means that any drift or fluctuations in the
reference voltage will be corrected.
If there is a need for using another reference voltage than the one provided by the AX1 module, it is still possible to
use the correction function simply by overwriting the reference voltage by an external reference voltage. In the
example below, the 24 V supply is used as external reference voltage. Since the high-voltage input is pre-
configured as a “Vref potentiometer input”, the input voltage will be measured relative to the external reference
voltage and scaled to a value between 0 (input = 0V) and 10000 (input = Vref).
Again, drift and fluctuations in the external voltage supply will automatically be corrected. This makes it even
possible to use a 24 V battery with a charger as the voltage source for the complete system.
In such a system XDi will compensate even when the voltage has dropped down to 18V, when the battery is nearly
discharged, and up to 28-29V when the battery is fully charged again.
5.6.9.12
Input lost detection on a single potentiometer input
Single potentiometer
