3.49.2 Principle
Long start protection is used during the starting process of an electric motor, where the starting
time exceeds the maximum allowable starting time due to heavy loads or blockages. If the starting
time of the electric motor is too long, it can cause the rotor to overheat and seriously affect the
service life of the electric motor. The long start protection starts timing when the motor starts and
the maximum phase current reaches 0.1Ie. If the starting current exceeds the peak value within
the [motor start time] and drops to within 1.2Ie, the long start protection returns. Otherwise, the
long start protection will trip.
To Next Page
Loading...