ACE can provide circuit boards of various brands such as Monarch and STEP, including motherboards, interface boards, communication boards and display boards with provide universal communication protocol, or dedicated communication protocol of various manufacturers.

The elevator control system hardware consists of the car operating panel, hall door signal, PLC, frequency converter, and speed control system. The frequency converter only completes the speed control function, while the logic control part is completed by the PLC. The PLC is responsible for processing the logical relationship of various signals, so as to send start and stop signals to the inverter. At the same time, the inverter also transmits its own working status to the PLC to form a two-way communication relationship. The system is also equipped with a rotary encoder and a PG card that are coaxially connected with the motor to complete speed detection and feedback, forming a speed closed loop and a position closed loop. In addition, the system must also be equipped with a braking resistor. When the elevator is decelerating, the motor is in the state of regenerative power generation, and it feeds back electrical energy to the frequency converter to suppress the increase in DC voltage.

The elevator system is a six-story and six-station system. The hoistway is equipped with a car, safety window, counterweight, safety gear, sensor, leveling, floor magnetic isolation board, end station boarding and various action switches. There are overload and full load switches at the bottom. Each floor outside the hoistway is equipped with floor displays, call buttons and instructions, and a base station electric lock on the first floor. There is an organic room on the top of the hoistway. There are machine room maintenance buttons, slow up and slow down switches, and traction. There are pits, buffers, and overspeed governor sheaves at the bottom of the merging road; there are hall doors, car doors, door machine mechanisms, door knife mechanisms, door lock mechanisms, and doors in the car. Machine power supply circuit, safety touch panel, car top emergency stop, overhaul, slow up and slow down switches, car top lighting, car top wiring car, floor display above the car door and hall door, and internal selection on the right side of the car door Buttons and instructions, door switch buttons, alarm buttons, overload and full load instructions. The focus of this article is to transform the elevator control cabinet originally controlled by the relay, and replace the relay with PLC for elevator control to improve the reliability and safety of the elevator; then the elevator signal is collected through DDC and sent to the workstation to monitor the elevator operation.

The DC elevator has the characteristics of fast speed, good comfort, and high leveling accuracy. This is because the DC drive system has good speed regulation performance and wide speed regulation range. The speed regulation methods of DC motors include changing the terminal voltage UA, adjusting the adjustment resistance Rtj, and changing the excitation.

There are usually two types of driving systems for DC elevators

(1) A thyristor-excited generator-motor drive system composed of a generator set. Access control elevator control system.

(2) SCR-motor drive system with direct power supply by SCR.

Both of them use the method of adjusting the motor terminal voltage Ua to adjust the speed. The former adjusts the output voltage of the generator by adjusting the excitation of the generator, so it is called the thyristor excitation system. The latter uses a three-phase thyristor rectifier to change the AC into a controllable DC, and supplies the speed control system of the DC motor, eliminating the need for a generator set, thus reducing the cost and making the structure more compact. The DC elevator has more equipment, The maintenance is more complicated and the cost is high, so it is often used in high-rise buildings with high speed requirements. It has the characteristics of good comfort, high leveling accuracy, fast elevators with speeds of 1. 5-1.75m/s and 2.5— High-speed elevator of 5m/s.

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