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During the commissioning process, the correct parameter settings of the inverter play a critical role. Improper configuration can lead to issues such as failure to start or brake, frequent tripping, and even damage to the IGBT or rectifier bridge. Inverters vary in complexity, with basic models having around 50–60 parameters and more advanced ones exceeding 200. However, not all parameters need to be reset during debugging. Most can be adjusted based on factory settings unless they are clearly unsuitable for the application. Key parameters that require careful adjustment include external terminal operation mode, analog control, base frequency, maximum and minimum frequency limits, start-up and braking time, thermal protection, overcurrent protection, carrier frequency, stall protection, and overvoltage protection.
Proper parameter setup ensures smooth operation and prevents equipment failure. For example, setting the starting time too short may cause the motor to lock up due to excessive load torque, which could result in overheating and potential damage. Similarly, improper braking time settings can trigger overvoltage trips, especially when dealing with pumps or fans where sudden stops may create water hammer effects. Adjusting the base frequency can help heavy loads like extruders or mixers start more effectively by increasing the voltage at lower frequencies, thus improving torque output.
Overvoltage during braking is often caused by insufficient braking resistance or too short of a deceleration time. To resolve this, you can increase the braking resistor value or use energy consumption braking, DC braking, or feedback braking depending on the application. Energy consumption braking dissipates excess energy as heat, while DC braking is ideal for precise parking. Feedback braking is suitable for high-power systems where energy can be returned to the grid.
Other common issues include overcurrent trips during no-load or light-load conditions, which are often due to excessive compensation voltage or starting torque. Reducing the compensation level or restoring factory settings can usually fix these problems. At low frequencies, overcompensation can also lead to OC trips, so adjusting the base frequency or increasing the starting torque might help. If the motor struggles to start, it could be due to high inertia or load torque, and solutions include reducing the base frequency, increasing the starting frequency, or adjusting the carrier frequency to improve torque performance.
After installing the inverter, some users may notice increased motor temperature, vibration, and noise. This is often related to the carrier frequency setting, which should be optimized based on the application. If the system does not respond when the RUN button is pressed, check the panel frequency setting, motor movement, input voltage, and other critical connections before attempting to restart.
By following these guidelines and making necessary adjustments, users can ensure reliable and efficient operation of their inverter systems.
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Shaanxi Xinlong Metal Electro-mechanical Co., Ltd. , https://www.cnxlalloys.com