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A method of starting and braking sequence control for hoisting frequency converter

A technology of control method and braking sequence, applied in the direction of program control, computer control, general control system, etc., can solve problems such as step process without frequency, and achieve the effect of preventing hook slipping

Active Publication Date: 2022-01-14
WISDRI WUHAN AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of the hook slipping of the crane without causing too much impact on the life of the electrical components, the present invention provides a sequence control method for starting and braking of the hoisting frequency converter, which can firstly eliminate the risk of slipping the hook, and secondly eliminate During the frequency step process, there will be no excessive instantaneous current, which will basically not affect the service life of electrical components

Method used

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  • A method of starting and braking sequence control for hoisting frequency converter
  • A method of starting and braking sequence control for hoisting frequency converter
  • A method of starting and braking sequence control for hoisting frequency converter

Examples

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no. 1 example

[0035] The first embodiment of the present invention comprises the following steps:

[0036] S1: Both the crane and the frequency converter are in the stop state, and the frequency converter monitors the operation command of the crane in real time, and executes the S2 stage after monitoring that the crane has a start command input;

[0037] S2: The frequency converter starts running immediately after the start command is detected by the crane. At this time, the frequency of the frequency converter is set to a certain starting frequency, and the torque limit value of the frequency converter is set to the verification torque value , the inverter runs to the starting frequency, and at the same time detects the output torque value of the inverter. When the torque value reaches the set verification value and remains for the set time, set the torque limit value as the default value of the inverter . In the present invention, the value of the verification torque is 60%, and the time...

no. 2 example

[0050] The second embodiment of the present invention comprises the following steps:

[0051] S1: Both the crane and the frequency converter are in a shutdown state, and the frequency converter monitors the operation command of the crane in real time, and executes the S2 stage after monitoring that the crane has a start command input;

[0052] S2: The frequency converter starts to run immediately after the start command is detected by the crane. At this time, the frequency of the frequency converter is set to a certain starting frequency, and then the frequency converter performs torque limiting to generate verification torque, and the frequency conversion is detected. After the output torque of the inverter reaches the verification torque, change the limit value, and the output torque of the inverter will increase. Gate opening signal, the verification torque stage lasts 0.5s, which can be changed according to the actual situation;

[0053] S3: After the frequency converter ...

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Abstract

The invention discloses a sequence control method for starting and braking of a hoisting frequency converter. The invention starts the frequency converter immediately after the start command is detected by the crane, sets the frequency of the frequency converter to a certain starting frequency, then runs to the starting frequency, and after the detected torque reaches the set brake opening threshold, the frequency conversion The inverter outputs the brake opening signal, and the brake starts to open; after the brake is fully opened, the frequency converter runs at the set operating frequency; after the load rises or falls to the specified height, the crane sends a stop command, and the given frequency of the frequency converter Decrease according to the set deceleration slope, and the frequency converter decelerates to run; when the output frequency of the frequency converter drops to the brake closing threshold, the frequency converter outputs a brake closing signal, and the brake starts to close; the frequency converter continues to decelerate to the stop frequency, keeping The frequency runs for a period of time, and the inverter stops running. The invention effectively prevents the crane from slipping when the brake is opened and closed.

Description

technical field [0001] The invention relates to the field of frequency converter control, in particular to a method for controlling the start and brake sequence of a hoisting frequency converter. Background technique [0002] The hoisting condition load type in the lifting industry is a potential energy load. Because heavy objects are affected by gravity, they cannot hover in the air without special braking devices. Therefore, a brake system must be installed on the motor shaft. Most brake systems are normally closed, that is, when the brake system is powered off, the brake is closed and the motor shaft cannot rotate; when the brake is powered on, the brake is opened and the motor can rotate. When the weight begins to lift or hover, it is required that the action of the brake and the motor must cooperate closely. Since the action process of the brake from tightening to releasing, and from loosening to tightening takes time, the action of the motor torque is reflected almo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/25257
Inventor 余克军王胜勇卢家斌王天生金富宽
Owner WISDRI WUHAN AUTOMATION
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