Patent ID: 7272302

Claim:
A field adjustable motor control system comprising: a motor; an inverter coupled to provide energization to the motor; a controller coupled to the inverter, the controller providing signals to control the output of the inverter in response to received input control signals and in response to field adjustment signals, wherein the input control signals define a first and a second operating state of the controller, each of the first and second operating states corresponding to a desired operating state of the system; a first field adjustment circuit for providing a first field adjustment signal to the controller, the first field adjustment signal, in combination with the input control signals, defining a desired output parameter of the inverter for the first operating state; and a relay coupled at its inputs to a source of line power and to the output of the inverter and at its output to the motor, the relay receiving control signals from the controller and being configured such that, in the event of a failure of the controller, the relay will couple the line power to the motor.