The main functions of soft-startes are:
– Controlled acceleration: When the acceleration of the engine is controlled by means of a linear or S acceleration ramp. This ramp is generally adjustable, allowing varying the acceleration time.
– Speed control: A speed regulator is a dependent variator and has a control system with power amplification and feedback. It is called closed loop. The motor speed is defined by a reference 3/4 hp 56c motors and the reference value is permanently compared to a return signal, motor speed image. This signal is normally emitted by a tachogenerator or by a pulse generator mounted at the end of the motor shaft. Because of a speed variation, a deviation is detected, so the reference value is corrected automatically so that the velocity returns to its initial value. Thanks to the regulation, the speed is practically insensitive to the disturbances.
– Speed variation: The speed of the motor is decided by an input, voltage or current, called reference. For a certain reference value, this speed may change depending on the disturbances (variations in supply voltage, load, or temperature). The speed variation is expressed as a function of the nominal speed.