What is Elevator VFD？

What is Elevator vfd?

Elevator vfd is a power control device used in elevator systems, which is mainly used to control the speed and operation of elevator drive motors. Traditional elevator systems usually use traditional resistive transformers to control the speed of elevator motors, but this method is inefficient and has limited control accuracy.

The Elevator vfd adopts advanced frequency conversion technology to achieve precise control of motor speed and torque by changing the operating frequency of elevator drive motors. The inverter converts the power supply AC into DC, and then converts DC into variable frequency AC, so that the speed and operation of the motor can be adjusted according to demand.

The Elevator vfd controls the elevator in an S-shaped manner, that is, the acceleration at start and stop is relatively gentle, while the acceleration in the middle process is relatively fast, mainly to improve the comfort of passengers and to achieve energy saving.

The Elevator vfd is usually composed of an inverter host, a control panel and a touch panel. By setting different speeds and operating parameters, the elevator can achieve smooth start and stop, level parking and smooth operation.

What is the use of Elevator vfd?

Elevator vfd plays an important role in elevator systems and provide many benefits and functions for the operation of elevators, including but not limited to the following aspects:

1. Smooth operation

The Elevator vfd can adjust the speed of the elevator drive motor according to actual needs, making the start and stop process of the elevator smoother. Compared with traditional resistive transformer control, the elevator vfd can accurately control the acceleration and deceleration of the motor, thereby reducing the impact and vibration of the elevator during the start and stop process, and providing passengers with a smoother riding experience.

2.  Accurate parking

The elevator vfd can accurately control the parking position of the elevator at the target floor based on information such as floor signals and door opening and closing signals. It can enable the elevator to stop smoothly when it reaches the floor, avoiding the overshoot or inadequate parking phenomenon under the traditional method, and improving the parking accuracy of the elevator.

3. Reduced energy consumption

The elevator vfd can intelligently adjust the power output of the drive motor according to the elevator load and operation requirements. Compared with the conventional constant speed method, the Elevator vfd can adjust the power and speed of the motor output on the premise of meeting the operation requirements to achieve energy saving. This can not only reduce the energy consumption of the elevator system, but also extend the service life of the elevator equipment.

4. Fault diagnosis and maintenance

The elevator vfd is usually equipped with fault diagnosis and self-diagnosis functions, which can monitor the operating status of the elevator system in real time and provide corresponding diagnostic information through alarms and fault codes. This enables maintenance personnel to locate and solve potential problems more quickly, improving the efficiency and accuracy of maintenance.

If the frequency inverter is maintained regularly, the failure rate of the inverter can be greatly reduced:

4.1 The temperature of the elevator electrical room should not be too high, otherwise the inverter components will age easily. It is best to install air conditioning, which has a good effect;

4.2 Prevent rain from getting wet. Usually, when a typhoon blows, the windows and doors are damaged by the wind and the frequency inverter is exposed to rain;

4.3 Lightning protection, this is related to the lightning protection facilities of the entire building or the entire community. The frequency inverter struck by lightning is generally severely damaged;

4.4 The cooling fan of the frequency inverter should be cleaned regularly. The frequency inverter maintenance method adopts two methods: online voltage detection and DC resistance measurement. If it is found that it has noise or does not run, it must be replaced;

4.5 The abnormal noise of the elevator motor usually indicates that there is a problem with the inverter, such as unbalanced three-phase current of the motor. At this time, it is best to repair it. Waiting until the frequency inverter is completely broken may cause serious damage.

In addition, the elevator vfd also supports remote monitoring and maintenance, allowing maintenance personnel to monitor and adjust the operating parameters of the elevator through remote access to the system, effectively reducing the waste of human resources and improving the convenience of maintenance.

In short, as an important part of the elevator system, the elevator vfd realizes precise control of the elevator drive motor through frequency conversion technology. It can achieve smooth operation, precise parking and energy saving and consumption reduction of the elevator, providing a safe and comfortable riding experience for elevator passengers. At the same time, the elevator vfd also has fault diagnosis and maintenance functions, helping maintenance personnel to find and solve problems in time and extend the service life of elevator equipment. By applying elevator vfds, we can improve the performance and reliability of the elevator system and provide people with more convenient and efficient options for travel.