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download pdf file The load monitor determines the angle cosφ.which is the phase shift between current and voltage of asynchronous motors. The load monitor is directly connected to the motor and no additional sensors are required. Because the phase angle depends on motor loading, it represents a directly measurable variable for the motor loading. The set point cosφ reacts either to an excessive or insufficient freely selectable phase angle. After a set period of time, the relay R switches to failure position and the LED is switched on.