systems and methods are provided for performing diagnostic testing for multiple motor drives operating in parallel . in one embodiment , the diagnostic testing may involve determining which of the multiple motor drives are in operation and communicating the active configuration of motor drives to testing circuitry . the testing circuitry generates an enable input signal transmitted to the transistor gates in each of the active motor drives . the testing circuitry also generates a power supply input signal transmitted to a dc to dc converter in each of the active motor drives . the responses to the enable input signal and the power supply input signal are measured to determine safety compliance .