Starting and braking time sequence control method for hoisting frequency converter

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

Active Publication Date: 2021-05-07
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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  • Starting and braking time sequence control method for hoisting frequency converter
  • Starting and braking time sequence control method for hoisting frequency converter
  • Starting and braking time sequence control method for hoisting frequency converter

Examples

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no. 1 example

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

[0036]S1: Both the crane and the inverter are in a downtime, and the inverter monitors the running command of the crane. When the crane is monitored, the S2 phase is performed after the start command input is input;

[0037]S2: When the instant drive after the crane is issued, the instant drive starts running, at which point the frequency of the inverter is a certain start frequency, and the torque limit of the drive is set to verify the torque value. The inverter runs to the start frequency, and detects the output torque value of the inverter. When the torque value reaches the set verification value and holds the set time, the torque limit value is set to the default value of the drive. . In the present invention, the value of the validation torque is 60%, and the time is set to 0.5 s. When the torque value reaches the set verification value and holds the set time, the torque limit is set to 180%, while d...

no. 2 example

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

[0051]S1: Both the crane and the inverter are in a downtime, and the inverter performs real-time monitoring of the running command of the crane. Monitor the crane after the start command input is executed after the start command input;

[0052]S2: When the instant drive after the crane is issued, the active frequency converter is started, the frequency of the inverter is set to a certain boot frequency, and then the drive is a torque limit to generate the verification torque, detect the frequency conversion. After the output torque reaches the validation torque, the limit is changed, the inverter output torque rises, when the output torque is greater than the brake open threshold, all the conditions that open the brake are satisfied, the inverter output hug The gate opens the signal, the verification torque phase lasts 0.5 s, can be changed according to the actual situation;

[0053]S3: After the inverter is...

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Abstract

The invention discloses a starting and braking sequential control method for a hoisting frequency converter. A frequency converter is started at the moment after a crane is monitored to send a starting command, the frequency of the frequency converter is set to be a certain starting frequency, then the frequency converter runs to the starting frequency, and after the detected torque reaches a set band-type brake opening threshold value, the frequency converter outputs a band-type brake opening signal, and a band-type brake starts to be opened; after the band-type brake is completely opened, the frequency converter operates according to the set operation frequency; after a load ascends or descends to a specified height, a crane sends a shutdown instruction, the given frequency of the frequency converter is reduced according to a set deceleration slope, and the frequency converter decelerates to operate; when the output frequency of the frequency converter is reduced to a band-type brake closing threshold value, the frequency converter outputs a band-type brake closing signal, and the band-type brake starts to be closed; and the frequency converter continuously decelerates to the shutdown frequency, operates for a period of time at the frequency, and stops operating. According to the invention, the hook slipping phenomenon of the crane when the band-type brake is opened and closed is effectively prevented.

Description

Technical field[0001]The present invention relates to the field of inverter controls, and more particularly to a lifting-converter start and brake timing control method.Background technique[0002]The lifting industry's lifting work condition load type belongs to the bit energy load. Due to the influence of heavy objects, if there is no dedicated brake device, the weight cannot hover in the air. Therefore, the brake system must be installed on the motor shaft. Most brake systems are often closed, that is, when the brake system is powered off, the brake is closed, the motor shaft cannot be rotated; when the brake is powered, the brake is opened, the motor can rotate. When the heavy object begins to rise or hover, it is necessary to match between the action of the brake and the motor. Since the brake is tightened to release, and the action of the motor torque is almost reflected in energization or power-on motion, the motor torque is almost reflected. Therefore, there is a problem in th...

Claims

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Application Information

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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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