In previous articles, we focused on how to optimize the operation of a variable frequency drive (VFD). This time, we will look at common mistakes that can lead to VFD damage.
Although manufacturers strive to make VFDs durable against various conditions, improper installation or lack of maintenance can damage them. Understanding these factors will help prolong the lifespan of the device and avoid downtime.
One of the quickest ways to damage a VFD is to connect it to an incorrect, excessively high voltage. This most commonly happens when a 230V VFD is connected to a 400V network, which destroys the varistors inside due to overload. This can lead to damage to the printed circuit board, as seen in the image.
If the power voltage is connected to motor terminals, the VFD may self-destruct when activated. This can happen even despite correct terminal labeling. Always ensure that connections are checked to avoid unnecessary damage.
Connecting power to the control or serial communication terminal can destroy the control circuits, as seen in the image. Even if some protection is available, it usually does not cover power voltages.
Over-tightening cables to terminals can damage the connections. Manufacturers specify the recommended torque, so always check the instructions.
Dust and moisture are common reasons for VFD failures, especially for IP20 protection devices exposed to environmental conditions. Dust can accumulate around high-voltage components, promoting electrical breakdown.
Regular maintenance, including cleaning the VFD from dust and controlling moisture, is essential. Dust accumulation can obstruct airflow and cause fan failure, which in turn can lead to system overheating.
Choosing to connect the VFD properly and following installation recommendations can significantly extend the lifespan of the device and prevent unexpected failures. Remember these basic rules:
These simple actions will help prevent the most common causes of errors and protect your equipment investment. If you have questions about VFD selection or maintenance, contact our specialists for a personalized consultation.
