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The rapid development of technologies and circuit solutions over the past few years has made frequency converters more accessible, compact, and affordable for all categories of consumers, including businesses, institutions, and private households.
Changes in Maintenance
In the past, the installation and maintenance of frequency converters were carried out exclusively by specialized professionals. Today, however, thanks to simplified instructions and user-friendly software, this task is often undertaken by individuals without specialized education. Nevertheless, there are a number of aspects that are not always covered in the documentation.
Key Points in the Use of Frequency Converters
Soft Start of the Motor
The frequency converter provides a smooth start and stop of the motor, which significantly reduces the load on the mechanical and electrical components of the system. This allows for an extended lifespan of the motor, bearings, and other important parts, as well as greatly reducing peak electrical loads during startup.
Choosing a Motor
When choosing a frequency converter, many non-specialists focus solely on its rated power in kilowatts. It is important to also pay attention to parameters such as rated current (A) and rated voltage (V).
Operation at Low Speeds
In many systems, such as pumps or fans, a significant portion of operation occurs at reduced speeds (less than one-third of the nominal). In such cases, the cooling of the motor windings may be seriously compromised, leading to a risk of overheating. To prevent overheating, it is recommended to use additional cooling methods, such as forced or natural ventilation, or additional radiators.
Electromagnetic Compatibility
There is a possibility of electrical interference occurring near the installation site of the motor and other elements of the electric drive. Although quality frequency converters are protected against major types of interference, it is advisable to carefully arrange cable communications at right angles when they intersect.
Fan Issues
In many fan installations, there may be reverse rotation of the turned-off fans due to air flows. To avoid such situations, it is advisable to use the DC motor braking function before starting it. Expensive converter models may also provide the option to synchronize the motor speed with the fan shaft.