3HAC026271-001 3HAC027648-00102 Ensuring the completion of the braking process requires braking condition judgement and deceleration point determination in the main program. Before the deceleration point is determined, the lift is always in the process of acceleration or steady speed operation. The acceleration process is completed by a fixed-cycle interrupt, and after accelerating to the maximum value of the corresponding mode, the operating conditions of the acceleration procedure are no longer satisfied, and after each interrupt, the acceleration procedure is no longer executed, and returns directly from the interrupt.

3HAC026271-001 3HAC027648-00102 The lift runs at the maximum value of the corresponding mode, and after the deceleration point of this mode is reached, a high-speed counting interrupt is generated to execute the deceleration service program. The condition for modifying the counter set value in this interrupt service routine ensures that the next interrupt is executed. Although the PI regulator is used to control both the rising speed section and the steady speed section of the system, the PI parameters of the two sections are different to improve the dynamic response index of the system.

3HAC026271-001 3HAC027648-00102 In the internal registers of the PLC, the values of the deceleration curve table are arranged in descending order, and each interrupt performs the operation of “adding 1 to the table pointer”, so that the value of the table for the next interrupt will be smaller than the value of the table for the current interrupt. The judgement of door area and level area is given by external signal to ensure the reliability of the deceleration process.