Elevator energy-saving renovation suppliers remind you that in the fierce competition of the elevator industry, with the rapid development of technology, various new materials, processes, and technologies are constantly being applied to elevators, making them develop towards safer, faster, and more intelligent directions. The situation of people being trapped due to elevator malfunctions is decreasing day by day, and at the same time, the problem of elevator power interruption caused by various factors is becoming increasingly prominent. In order to minimize the adverse effects on the psychological and physiological well-being of trapped passengers, emergency devices for elevators have emerged.
In recent years, elevator emergency devices have developed significantly as a relatively independent electromechanical product. Although the names of such devices seen in the market today vary, such as "elevator emergency device", "elevator power outage automatic leveling control screen", "elevator power outage automatic rescue device", etc. There are also many product brands and manufacturers, but their hardware structure and working principles are basically the same. This type of elevator emergency device generally consists of several parts, including the main control board, charging board, inverter board, interface board, battery pack, and phase sequence detection.
When there is a power outage, phase loss, or phase sequence error, the emergency device of the elevator completely takes over the control of the elevator. The specific working process is to cut off the connection between the elevator and the mains power when the emergency device of the elevator detects a power outage, phase loss, or phase sequence error. Detect whether each link of the elevator safety circuit is normal, whether the elevator car is stopped at a non level position, and whether the elevator is in maintenance work status through its own input signals. After the test results meet the conditions for emergency operation, the inverter board is immediately started, and the voltage of each level generated by the inverter is directly sent to various parts such as the elevator traction machine, brake, door machine, etc. The emergency device of the elevator first drags the elevator to run once in both the up and down directions, and then runs at a low speed in the labor-saving direction. When the elevator car reaches the first leveling position in the direction of operation, level it, open the door to release people, and then stop working.
The PFU elevator emergency feedback device organically combines the elevator feedback function with the elevator emergency power supply function into one system, which can achieve both elevator feedback and elevator emergency power supply. Adopting advanced algorithms to achieve complete sine wave energy feedback and sine wave three-phase emergency power output. Transforming the regenerated DC energy during elevator operation into AC energy synchronized with the power grid and sending it back to the grid to achieve energy conservation. It can also provide three-phase emergency power to the elevator after the power grid is cut off, achieving the function of emergency leveling for the elevator. The PFU elevator emergency feedback device organically combines the elevator feedback function with the elevator emergency power supply function into one system, which can reduce costs and improve reliability.
The main advantages of PFU elevator emergency feedback device are as follows:
⑴ It has all the functions of emergency power supply for ordinary elevators;
The recycling efficiency of regenerated electrical energy is as high as 97.5%, with significant energy-saving effects and a comprehensive energy-saving efficiency of 20-50%;
The device is equipped with reactors and noise filters, which can be directly connected to the power grid without causing interference to the power grid and surrounding electrical equipment;
Special battery management ensures that the battery life is more than three times that of peers (other feedback devices);
⑸ Adopting multiple cutting-edge technologies, compatible with all brands of elevator frequency converters;
When the power supply of the PFU is interrupted, it ensures that the elevator stops nearby or returns to the ground floor and opens the door. When the power supply is normal, it is an energy regeneration feedback device, and the economic benefits generated during its service life far exceed the investment cost of the equipment;
Adopting electromagnetic isolation technology to isolate the battery from three-phase electricity, ensuring the safety of the battery and frequency converter;
⑻ Adopting military grade high-speed DSP central processing unit
High feedback efficiency, accurate control precision, good stability, minimal harmonics, and strong anti-interference ability;
Adopting SVPWM modulation technology
SVPWM modulation technology can achieve DC to AC conversion, perfectly restore the three-phase output voltage, and output a perfect current waveform through the superposition effect of filters and three-phase power grids;
Adopting LC filtering technology
Effectively suppress harmonics and electromagnetic interference, with current and voltage THD<5%, ensuring feedback of clean electrical energy;
⑾ Adopting phase sequence automatic recognition technology
The phase sequence of a three-phase power grid can be freely connected without the need for manual distinction of phase sequence;
12. Built in fuse
Short circuit protection is in place to ensure the safe operation of the elevator;
13. It can automatically disconnect from faults to ensure the normal operation of the elevator
It is redundant with the original control system of the elevator and does not change the original control mode of the elevator;