Maintenance-free motor soft starter with self-checking function

Abstract

The invention relates to a motor soft starter, in particular to a maintenance-free motor soft starter with self-checking function. The invention is characterized in that the maintenance-free motor soft starter with self-checking function has self-checking function and maintenance-free function. The maintenance-free function employs controlled silicon which is electronic apparatus without contacts. The benefit of the invention is that the controlled silicon is electronic apparatus without contacts, thereby requiring no frequent maintenance to conducting liquid, parts and the like; therefore, mechanical life is changed into service life of electronic element, thereby requiring no downtime maintenance after continuous operation for many years. When installing, the maintenance-free motor soft starter with self-checking function can be put into operation only after connection with power-supply wire and motor wire. Mechanical and electrical tests can be done to the entire system by using low voltage. Therefore, the motor soft starter with self-checking function has self-checking, self-learning and automatically set-up start-parameter functions.

Description

[technical field] [0001] The invention relates to a motor soft starter, in particular to a maintenance-free motor soft starter with a self-check function. [Background technique] [0002] At present, the control function of the known soft starter is not perfect and lacks many protection functions, such as the impact of the current during the starting and stopping of the motor, the high capacity of the power grid, and the mechanical impact when the motor starts. For example, as the most widely used squirrel-cage asynchronous motor, it adopts the conditions for step-down starting: first, when the motor starts, the machine cannot withstand the impact torque of full-voltage starting; second, when the motor starts, its terminal voltage cannot meet the specification requirements ; The third is that when the motor starts, it affects the normal operation of other loads. [Content of the invention] [0003] In order to overcome the deficiencies of current motor soft starters, the in...

AI Technical Summary

Problems solved by technology

For example, as the most widely used squirrel-cage asynchronous motor, it adopts the conditions for step-down starting: first, when the motor starts, the machine cannot withstand the impact torque of full-voltage starting; second, when the motor starts, its terminal voltage cannot meet the specification requirements ; The third is that when the motor starts, it affects the normal operation of other loads