Adaptive logic board for variable speed drive

A heating, ventilation, air conditioning, and refrigeration (HVAC&R) system, comprising:

• a motor configured to drive a compressor;
• a variable speed drive (VSD) coupled to the motor, wherein the VSD is configured supply a first electric current to the motor through a plurality of power lines;
• a plurality of current transducers, wherein each current transducer of the plurality of current transducers is disposed about a corresponding power line of the plurality of power lines;
• and
• an adaptive logic board communicatively coupled to the VSD, wherein the adaptive logic board comprises a plurality of signal sensing circuits, wherein each signal sensing circuit of the plurality of signal sensing circuits is electrically coupled to a corresponding current transducer of the plurality of current transducers, wherein the plurality of current transducers is configured to generate a plurality of second electric currents, and wherein each signal sensing circuit of the plurality of signal sensing circuits comprises:
• a resistor configured to receive a respective second electric current of the plurality of second electric currents;
• and
• an adaptive sensing unit electrically coupled to the resistor, wherein the adaptive sensing unit is configured to measure a voltage drop of the respective second electric current across the resistor, the adaptive sensing unit comprises a programmable resistor electrically coupled to the resistor, and the adaptive sensing unit is configured to adjust a resistance value of the programmable resistor based on a size of the VSD.