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Frequency converter overload protection system and method thereof

A technology of overload protection and frequency converter, applied in the direction of load hanging components, safety devices, transportation and packaging, etc., can solve the problem of expensive overload limiters of cranes and so on.

Active Publication Date: 2015-06-10
SUZHOU INOVANCE TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a frequency converter overload protection system and method for the above-mentioned problem that the crane overload limiter is expensive

Method used

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  • Frequency converter overload protection system and method thereof
  • Frequency converter overload protection system and method thereof
  • Frequency converter overload protection system and method thereof

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0026] like figure 1 Shown is a schematic diagram of the first embodiment of the inverter overload protection system of the present invention. In this embodiment, the system includes an output control unit 11 , a torque calculation unit 13 , an output detection unit 12 and an overload protection unit 14 . The above-mentioned units can be implemented by software integrated into the frequency converter, and the original hardware equipment in the frequency converter can be used for corresponding operations; of course, the above-mentioned units can also be realized by devices independent of the freque...

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Abstract

The invention provides a frequency converter overload protection system, which comprises an output control unit, a torque calculation unit, an output detection unit and an overload protection unit. The output control unit is used for making the frequency converter reach a set operation frequency and operate at the set frequency for specified time when the frequency converter executes a lifting operation; the output detection unit is used for detecting the output voltage and current of the frequency converter; the torque calculation unit is used for calculating the output torque of the frequency converter according to the output voltage and current; and the overload protection unit is used for determining overload and making the frequency converter execute deceleration and stop operations when the output torque exceeds a set maximum output torque, while disabling the lifting command. The invention also provides a corresponding method. According to the invention, frequency converter overload is determined by detecting the torque in uniform speed operation of the frequency converter, to achieve high overload determination accuracy and low cost.

Description

technical field [0001] The invention relates to the field of electromechanical safety, and more specifically relates to a frequency converter overload protection system and method. Background technique [0002] At present, cranes are widely used in construction sites, docks, warehouses, workshops, etc., for hoisting building materials, machinery equipment, goods, etc., and their working characteristics are frequent starts, uncertain lifting capacity, and overloading often occurs during the work process Case. When the crane is overloaded, it will cause safety accidents and cause damage to the components of the crane. In order to avoid crane safety accidents and prolong the service life of the crane, it is necessary to limit the overload of the crane. For example, the current hoisting industry requires the installation of overload limiters on the hoisting mechanism. The overload limiting device detects the load pulled by the hoisting mechanism of the crane by mechanical def...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C15/00
Inventor 殷杰周晖强唐杰邱志红
Owner SUZHOU INOVANCE TECH CO LTD
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