Pump assembly and method for controlling an electric motor for driving an impeller of a pump unit of a pump assembly

A method for controlling an electric motor for driving an impeller of a pump unit of a pump assembly, the method comprising:

• receiving a pulse width modulated (PWM) control signal at an interface of the pump assembly;
• interpreting the PWM control signal at start-up of the electric motor per default in a configuration mode as a configuration bit sequence based on a duty cycle of the PWM control signal during a pre-determined configuration window;
• controlling the speed of the electric motor in a control mode according to the duty cycle of the received PWM control signal after a lapse of the configuration window;
• and
• extending a length of the configuration window at least until the full configuration bit sequence has been received under a condition that a valid synchronization sequence was detected in the interpreted configuration bit sequence.

A pump assembly comprising:

• a pump unit comprising an impeller configured to pump fluid;
• an electric motor for driving the impeller;
• a control module configured to control a speed of the electric motor in a control mode, the control module comprising a configuration mode;
• and
• an interface configured to receive a pulse width modulated (PWM) control signal with a duty cycle indicative of the speed of the electric motor, wherein the control module is configured to interpret the PWM control signal at start-up of the electric motor in the configuration mode as a configuration bit sequence based on the duty cycle of the PWM control signal during a pre-determined configuration window, wherein the configuration mode is a default mode for interpreting the PWM control signal, wherein the control module is configured to extend a length of the configuration window at least until the control module has received a full and valid configuration bit sequence under a condition that a valid synchronization sequence was detected in the interpreted configuration bit sequence.