Frequency converter operation and related parameter settings - Database & Sql Blog Articles

Probe domestic high frequency needle JKT-50L with three probes

Photocoupler

The inverter is equipped with over 100 adjustable parameters, each with a specific range of settings. Improper configuration of any parameter can lead to operational issues. Common control modes include speed control, torque control, and PID control. Once the control method is selected, it's usually necessary to perform static or dynamic identification based on the required precision. The minimum operating frequency refers to the lowest speed at which the motor can run. At low speeds, the motor's cooling performance is significantly reduced, and prolonged operation at such speeds may cause overheating and damage. Additionally, increased current in the cables at low speeds can also lead to cable heating. The maximum operating frequency typically ranges from 60Hz to as high as 400Hz. High-frequency operation causes the motor to run faster, and standard motors may not be designed for extended operation beyond their rated speed. The rotor must be able to withstand the centrifugal force generated at these speeds. The carrier frequency setting affects harmonic distortion, which is influenced by the length of the cable, motor heating, and inverter performance. Motor parameters such as power, current, voltage, speed, and maximum frequency are set within the inverter, and these values can usually be found directly on the motor's nameplate. Frequency hopping is another important consideration, as resonance may occur at certain frequencies—especially in systems with high overall rigidity. When controlling compressors, it's crucial to avoid the surge points that could cause instability or damage.