Choosing a low-voltage inverter involves seven key steps. First, you need to understand the equipment’s operating mode, size, and load type. Then, consider the process requirements, functional standards, and control needs. Next, define the system's I/O interface, communication interface, and setup mode. After that, summarize all performance requirements and specifications. Based on these findings, decide whether to conduct direct bidding or seek technical consultation. Compare options based on service life, cost, performance, and support. Finally, determine the specific model, specification, brand, and supplier of the inverter.
When it comes to conventional operation of a drive control system, selecting a general-purpose inverter is crucial. Start by identifying the final goal of the inverter, considering the speed response and characteristics of the production machinery. Analyze factors like torque, control accuracy, and load characteristics to choose the right control function for the system. The selected inverter should meet both the operational needs and technical and economic standards. Pay attention to potential issues such as power efficiency, harmonics, lifespan, power factor, and after-sales service. Also, ensure that the inverter’s output and input interfaces, along with accessories like DC brake units and reactors, are properly considered.
The selection of a general-purpose inverter includes two main aspects: choosing the type and determining the capacity. The selection should be based on whether the inverter can effectively meet the process requirements and provide an ideal price-to-performance ratio. When selecting the type, start by analyzing the load characteristics. For example, fans and pumps typically have balanced torque with low starting torque at low speeds, so standard or special-function inverters may be suitable. For constant torque loads or applications requiring precise speed control, a high-torque inverter with torque control capabilities is necessary. These inverters offer stable performance even under impact loads and are ideal for applications like excavators. For higher precision and faster response, such as in injection molding machines, paper machines, or rolling mills, inverters with vector or direct torque control are recommended.
In terms of capacity, general-purpose inverters usually specify motor power, rated current, and capacity. It’s important to match the inverter’s rating with the motor’s specifications. While the motor’s rated current is a critical parameter, it’s essential to ensure that the inverter’s rated current is higher than the motor’s. This helps prevent overloading and ensures smooth operation. Additionally, when using inverters, it’s important to understand the motor’s settings, operating characteristics, and limitations. For example, submersible pump motors often have higher current limits compared to standard motors, while industrial motors may handle short-term high currents without issues. If multiple motors are used together, the total current must not exceed the motor’s maximum limit. Using standard motors without a gearbox may require increasing the current storage capacity to avoid damage. Inverters can cause unstable output, which may harm the motor. Therefore, it’s important to set current limits to prevent overheating and motor failure.
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