Adaptive logic board for variable speed drive for heating, ventilation, air conditioning and refrigeration system

A method of operating a variable speed drive (VSD) using an adaptive logic board, comprising:

• determining a size of the VSD, wherein the size of the VSD is based at least in part on a power output range of the VSD;
• determining a target cutoff frequency for a filter of a signal sensing circuit of the adaptive logic board based on the size of the VSD;
• adjusting a variable resistance element of the signal sensing circuit to achieve the target cutoff frequency of the filter;
• and
• filtering an input signal received from a sensor of the VSD via the filter to attenuate electrical waveforms in the input signal having a frequency that exceeds the target cutoff frequency and to generate a conditioned signal corresponding to the input signal.

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

• a variable speed drive (VSD) coupled to a motor of a compressor and configured to control an operational speed of the motor;
• a sensor configured to generate an input signal indicative of an operational parameter of the VSD;
• and
• an adaptive logic board communicatively coupled to the sensor and the VSD, wherein the adaptive logic board comprises:
• a signal sensing circuit comprising a filter configured to receive the input signal from the sensor and to condition the input signal, wherein the filter comprises a variable resistance element adjustable to alter a cutoff frequency of the filter, and the filter is configured to attenuate electrical waveforms of the input signal having frequencies that exceed the cutoff frequency;
• and
• a controller configured to adjust the variable resistance element to alter the cutoff frequency of the filter based on a parameter of the HVAC&R system.