Abstract: Systems and methods for preventing water from freezing within a pump system. A pump motor is positioned inside a pump housing. A temperature sensor and a motor controller are positioned inside a motor controller housing. A user interface (UI) controller is positioned in a UI housing. A UI is integrated into the UI housing. The UI controller receives a freeze protection temperature setting through the UI reflecting a difference between an ambient temperature at the location of the motor controller housing and an outdoor temperature and determines a freeze protection temperature threshold based on the setting. The UI controller also receives an adjusted temperature value from the motor controller based on the temperature sensed by the temperature sensor. The UI controller activates the pump motor when the adjusted temperature is below the freeze protection temperature threshold.

Abstract: A method of limiting current to a motor. The method comprising monitoring a speed of a motor, an input voltage of a controller, and a temperature of the controller. Determining a maximum current limit for the motor based on the monitored speed when the motor speed is below a speed threshold. Determining a maximum current limit for the motor based on the input voltage and the temperature when the motor speed is above the speed threshold and the input voltage is below an input voltage threshold. Determining a maximum current limit for the motor based on the temperature when the motor speed is above the speed threshold and the input voltage is above the input voltage threshold. Or determining a maximum current limit for the motor based on the monitored speed when the motor speed is above the speed threshold and the temperature is below a temperature threshold.