Brake unit suppliers remind you that with the continuous improvement of industrial automation, frequency converters have also been widely used. However, are our understanding and usage of frequency converters completely correct? That's not necessarily true, come and take a look at these misconceptions about using frequency converters. How many tricks have you taken!
1、 Power off when the frequency converter is not in use
The frequency converter belongs to electrical products, so even if you have backup, it is still better to connect it to the power. On the one hand, the backup machine is used in emergency situations, often without power or occasionally powered on. How can we ensure the normal operation of the frequency converter? On the other hand, the intermediate components in the frequency converter have electrolytic capacitors, so even if they are not used, they need to be regularly powered on to charge and discharge the electrolytic capacitors. The most important thing is that the frequency converter is not used after being powered on. The frequency converter only has the current of the control circuit, which can be almost ignored and will not cause significant losses or significantly reduce the service life of the frequency converter.
2、 The higher the power of the frequency converter, the better
Although a frequency converter is definitely better with higher power and can be pulled when encountering heavy loads, it is also more expensive with higher power. Therefore, choosing a suitable frequency converter power is sufficient, and for heavy loads, choose a heavy-duty model frequency converter. However, it is best not to exceed the third gear of the motor power, as too much may have a certain impact on motor protection.
3、 The frequency converter is used in a relatively dirty environment and must be blown with dust every day
Many people think that frequency converters need to be cleaned every day due to the high level of dust in their operating environment, but in fact, it is not necessary. In dusty environments, as long as the environment is not humid, the impact on the frequency converter is generally not significant, unless the air duct fan is blocked. If there is a lot of dust in the environment where the frequency converter is used, it is recommended to clean the dust every one or two months. However, blowing dust is also very important, and it is best not to do it under live conditions, as it may cause damage to the frequency converter.
4、 Contactors cannot be added to the output terminal of the frequency converter
Almost all frequency converter user manuals state that contactors cannot be installed on the output side of the frequency converter, and stipulate that "do not connect electromagnetic switches or electromagnetic contactors in the output circuit".
In fact, the manufacturer's regulations are to prevent the contactor from operating when the frequency converter has output. If the frequency converter is connected to a load during operation, the overcurrent protection circuit may operate due to leakage current. So, we just need to add a control interlock between the output of the frequency converter and the action of the contactor to ensure that the contactor can only operate when the frequency converter has no output, and a contactor can be installed on the output side of the frequency converter.