When selecting an inverter, it's crucial to understand the load type and environmental conditions. The inverter must be matched properly with the motor and the application. Different loads have different requirements, so choosing the right inverter is essential for optimal performance and longevity.
For common loads like fans and pumps, the inverter capacity should match the motor's rating. However, for more demanding applications such as air compressors, deep well pumps, or high-speed water fountains, a higher capacity inverter may be necessary to handle the increased load.
Cranes and hoists involve heavy starting loads, which can cause voltage spikes and mechanical stress. In such cases, the inverter needs to have a safety margin, and if there's potential for energy feedback during deceleration, a braking unit or a common bus system should be used to manage that energy effectively.
Loads that vary in intensity, such as those found in rolling mills or crushers, require careful consideration. The inverter should be sized based on the maximum load to ensure stable operation under all conditions.
Large inertia loads, such as centrifuges or cement kilns, present unique challenges. These systems may experience oscillations during startup and generate energy during deceleration. A slightly larger inverter can help reduce oscillation, while a braking unit can manage the returned energy efficiently.
If the motor will operate at low speeds for extended periods, heat buildup can become an issue due to reduced cooling. To prevent this, consider increasing the gear ratio or switching to a 6-pole motor to keep the motor running closer to a higher frequency, improving cooling efficiency.
The installation location of the inverter must meet standard environmental requirements to avoid malfunctions or premature failure. The distance between the inverter and the motor should generally not exceed 50 meters. If longer distances are required, adjusting the carrier frequency or adding an output reactor can help maintain stable operation and protect the system from electrical interference.
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