What are the starting current and starting torque of the motor when using a frequency converter for operation?

Using a frequency converter for operation, the frequency and voltage increase correspondingly with the acceleration of the motor, and the starting current is limited to below 150% of the rated current (125%~200% depending on the model).

When starting directly with a power supply, the starting current is 6-7 times the rated current, resulting in mechanical and electrical impacts. Using a frequency converter drive can smoothly start (with longer starting time). The starting current is 1.2~1.5 times the rated current, and the starting torque is 70%~120% of the rated torque; For frequency converters with automatic torque enhancement function, the starting torque is above 100% and can start with full load.

The protection function can be divided into the following two categories:

(1) Automatically perform corrective actions upon detecting abnormal states, such as overcurrent stall prevention and regenerative overvoltage stall prevention.

(2) After detecting abnormalities, block the PWM control signal of the power semiconductor device to automatically stop the motor. Such as overcurrent cut-off, regeneration overvoltage cut-off, semiconductor cooling fan overheating, and instantaneous power outage protection.

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