Several common problems of Delta and their solutions

Create Date: 2024-8-30 12:03:23|Source: Delta/Delta

What is the stall prevention function of the inverter?

If the given acceleration time is too short, the output frequency of the inverter changes much more than the change of speed, and the inverter will jump due to the flow of overcurrent, and the free operation is stopped, which is stalling. In order to prevent stalling and keep the motor running, it is necessary to detect the magnitude of the current and control the frequency. When the acceleration current is too large, the acceleration rate is appropriately slowed down. The same is true when slowing down. The combination of the two is the stall prevention function.

Several common problems of Delta and their solutions

What is the Vf form?

When the frequency drops, the voltage V also decreases in shares, and the share relationship between V and f is predetermined by considering the characteristics of the motor.

If the motor uses a Delta inverter to work, what is the starting current and starting torque of the motor?

Generally speaking, the direct start of the mains power will cause 6-7 times the starting current, and the electrical shock will be formed. When the motor selects the inverter to work, it can start smoothly and progress the frequency and voltage accordingly with the acceleration of the motor. The starting current is limited to less than 150% of the additional current (125%-200% depending on the model), and the starting torque is 70%-120% additional torque; And for the inverter with automatic torque enhancement function, the starting torque is more than 100%, and it can start with full load.

Why is it necessary to change the voltage and current of the inverter?

The torque of an asynchronous motor is caused by the interaction between the magnetic flux of the motor and the current flowing through the rotor. Under the additional frequency of the motor, if the voltage is fixed and only the frequency drops, then the magnetic flow will be large, the magnetic circuit will be full, and the motor will be burned out when it is severe. Therefore, the frequency and voltage should be changed in parts, that is, the frequency is changed and the output voltage of the inverter is controlled at the same time. The magnetic flux of the motor is fixed constantly, which can prevent the occurrence of weak and full magnetic phenomena. This control method is mostly used in energy-saving inverters such as fans and pumps.

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