Fault protection device for frequency converter and frequency converter

Abstract

The invention discloses a frequency converter fault protection device and a frequency converter. The frequency converter and a transformer are respectively connected to a power supply, the frequency converter outputs signals to a contactor to control the start and stop of a motor, and the transformer is connected to a safety circuit and a contactor through the safety circuit. To control the start and stop of the motor, the frequency converter and the safety circuit are respectively connected to the protection device. The protection device includes a fault detection module, a wave sealing circuit, and an enabling unit. The protection function of the frequency converter is realized through the protection device. In the present invention, by connecting the protection device to the frequency converter and the safety circuit, the protection device is provided with a fault detection circuit, a wave blocking circuit and an enabling unit, which can effectively detect various fault information and output them to the IGBT drive circuit in the frequency converter. The signal is blocked, thereby effectively protecting the working state of the frequency converter, and improving the service life, safety reliability and working performance of the frequency converter.

Description

technical field [0001] The invention relates to a protection device, in particular to a frequency converter fault protection device and a frequency converter. Background technique [0002] As a drive control device, the frequency converter is widely used in various fields, among which the elevator is operated through the drive control of the frequency converter. [0003] During the use of the inverter, it often encounters faults such as undervoltage, overvoltage, and overcurrent. If effective preventive measures are not taken for such faults, the service life of the inverter will be shortened or even damaged, and the life of the inverter will be affected. work performance, which leads to a series of problems such as shortened service life of the inverter, reduced safety and reliability, and failure of work performance. It can be seen that from the perspective of the service life, safety and performance of the inverter, how to protect the inverter in the event of undervoltag...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is a series of problems such as shortened service life of the frequency converter, reduced safety and reliability, and failure of working performance caused by the frequency converter encountering faults such as undervoltage, overvoltage, and overcurrent.

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