With the continuous improvement of industrial automation, inverters have also been widely used. The factory electrician door deals with the inverter almost every day, but is our use and understanding of the inverter completely correct? That is not necessarily, look at the misuse of these inverters, do you have any tricks?
Misunderstanding 1: Is the inverter still powered off when not in use?
The frequency converter is an electrical product, so even if you are spare, it is still good to use. The standby machine is used in an emergency, often does not power on or occasionally power on. How can the inverter be operated normally? The intermediate components in the inverter have electrolytic capacitors, so you don't have to use them to charge and discharge the electrolytic capacitors periodically. After the inverter is powered on, the inverter only has the current of the control loop, which can be neglected, and will not cause great loss or greatly reduce the service life. Therefore, it is recommended to power the inverter when not using the inverter for a long time!
Misunderstanding 2: The higher the power of the inverter, the better?
The inverter is of course better. In case of heavy load, the load can be pulled, and the power is much more. Therefore, the inverter should be selected as appropriate. Generally, the domestic inverter is larger than the motor. If you have a heavy load, choose a heavy-duty model inverter. However, the small series suggestion is better than the third gear of the motor power, too much may have a certain impact on the motor protection!
Misunderstanding 3: As long as the inverter is used to save energy?
Many people think that the torque of the two motors does not reach the rated torque of the motor (frequency, speed is still the same 50HZ), industrial automation products inverter will also play a role in energy saving, this is a mistake. Two identical motors work at 50Hz power frequency, one uses the inverter, one does not, and the speed and torque are in the rated state of the motor. I believe most people will think that the motor that uses the inverter will be more energy-efficient. Power saving. In fact, this is also a wrong idea. Under the same conditions, many people think that it can save a lot of power in the no-load state, but in fact, the drag-type load also saves a lot of power.
Misunderstanding 4: If the inverter is dirty, use dust every day?
There are many environmental dusts that need to be cleaned every day. In fact, it is not necessary. As long as the dust is not wet, it will not affect much. Unless your air duct fan is blocked, if dust is too much, it is recommended to clean the dust for one or two months! It will not be recommended to carry out the power supply, which may cause damage to the inverter.
Misunderstanding 5: Can't add contactor at the output of the inverter?
Almost all inverter instruction manuals indicate that the contactor cannot be installed on the output side of the inverter. Many manufacturers' inverter manuals stipulate that "Do not connect electromagnetic switches or electromagnetic contactors in the output circuit." The manufacturer's regulations are to prevent the contactor from operating when the inverter has an output. When the inverter is connected to the load during operation, the overcurrent protection circuit will operate due to leakage current. Then, as long as between the output of the inverter and the action of the contactor, the necessary control interlock is added to ensure that the contactor can only operate when there is no output of the inverter, and the output side of the inverter can be installed. Device.