In recent years, the contactless elevator control system has become a hot topic of discussion in the profession, among which the safe torque cancellation (STO), brake safety control and electronic star sealing are the three most important skills.
Safe torque cancellation (STO) means that a power supply capable of causing rotation is not applied to the motor. STO skills are applied to elevators with AC or DC motors powered and controlled by static components, and the safe control of the motor is completed by blocking the power supply of the motor. STO adopts a dual-channel circuit architecture, the safety integrity level reaches SIL3, and the hardware fault margin is 1, combined with the real-time comparison of the dual-channel status, to ensure the safe and reliable control of the motor. STO replaces the contactor to control the motor, which has the advantages of low operating noise, small size and fast response speed.
Brake safety control refers to the use of safety circuits containing electronic components to complete the safe control of brakes. The control of the brake is combined with the power supply, and the safe control of the brake power supply is used to complete the safe brake control. The brake control unit adopts the design structure of dual actuators, and the independent condition monitoring of the dual mechanisms makes the control of the brake safe and reliable. The safety circuit replaces the contactor to control the brake, which has the advantages of fast response and long life.
Electronic star sealing refers to the method of using the existing power module of the inverter to complete the method of limiting the unexpected moving speed of the car through the short circuit of the three-phase winding of the motor under the condition of safe torque off. The real-time detection of the electronic star sealing circuit fully guarantees the pre-diagnosis of circuit faults and the effectiveness of the star sealing control. The electronic star sealing method replaces the hardware star sealing method of the contactor, which has the advantages of small size, fast response and more reliable.
The contactless system treatment scheme not only promotes the innovation of elevator product skills, but also essentially deals with the problems encountered in practical application, which has far-reaching significance.
Safer: Safe Torque Cancellation (STO) function with mutually supervised dual-channel topology to reach the highest safety integrity level (SIL3) in the profession
More reliable: The electronic design replaces the electromagnetic contactor, comprehensively reduces the mechanical conflict and loss of the device, and improves the stability of the system operation
Fast response: Compared with the contactor, the safety utility circuit has a faster response speed and better motor control effect
Low noise: The largest noise source in the control cabinet is eliminated, which improves the applicability of the product in low-noise application scenarios
Small size: STO and electronic star sealing module are integrated in the inverter, and the SBC function is integrated in the power module, reducing the volume of the control cabinet by about 40%
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