Siemens M430 inverter exceeds 50HZ operation problem - Database & Sql Blog Articles

Single chip microcomputer STM32L151CCU6

Probe domestic high frequency needle JKT-50L high frequency needle with 3 probes

Photocoupler

One inverter matches the load motor and the inverter capacity exceeds the load motor.
1. In this case, select the frequency value beyond 50HZ operation. The maximum value given in the manual is very large. Can this maximum value be achieved? Or if the frequency exceeds 50HZ, it will cause a large torque to run? Still other.
2. In addition, the fan load uses square torque control and general load selection V/F control. Is it different from the range of 50HZ frequency? Some people say that V/F control can run at ultra high frequency for a long time, square torque control, frequency can not exceed A lot, is it?

Answer: 1. The key depends on the speed-torque curve of the motor and the rated torque value of the inverter. If the motor is constant torque characteristic below the rated frequency and above the rated frequency is constant power characteristic, if the frequency exceeds 50HZ operation, the torque will drop due to the motor being in constant power mode.
If the motor is a variable torque characteristic, similar to the fan pump type, the torque rises as the speed increases. Then, if the frequency exceeds 50HZ, the maximum frequency of the motor can be determined, depending on the maximum torque capacity of the inverter. In theory, the torque limit of the inverter can generally be set to 150% of the rated torque value, then your inverter can output the torque value of 150% of the rated value.
2, V / F control can run at ultra high frequency for a long time, square torque control, the frequency can not exceed a large range -
This is actually related to your load characteristics. The load characteristics are different, so the relationship between torque and frequency is different. Essentially, it is also the relationship between your load torque characteristics and the output torque capability of your drive.
Square torque control, the frequency can not exceed a large range, because the output torque capacity of the inverter is limited.