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Frequency converter restarting method and frequency converter restarting device

A frequency converter and restart technology, which is applied in the direction of output power conversion devices, electrical components, etc., and can solve problems such as current converter shutdown.

Active Publication Date: 2020-03-24
SHENZHEN BEITON CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology cannot quickly judge or reset the inverter shutdown caused by the temporary excessive current caused by the voltage sag

Method used

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  • Frequency converter restarting method and frequency converter restarting device
  • Frequency converter restarting method and frequency converter restarting device
  • Frequency converter restarting method and frequency converter restarting device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A method for restarting an inverter, such as figure 1 shown, including:

[0059] S11. Obtain a signal of fault input, and output a reset command;

[0060] S12. If the fault of the frequency converter is successfully reset, the power supply voltage is detected, and if the power supply voltage is within a preset range, a restart command is issued; if the fault of the frequency converter is not reset, the restart command is stopped.

[0061] The restart of the motor can be realized quickly, and the load damage caused by forced restart can be avoided according to the fault type.

Embodiment 2

[0063] A method for restarting an inverter, such as figure 2 shown, including:

[0064] S11. After the frequency converter starts normally, if the fault input signal is obtained, output a reset command;

[0065] S12. If the inverter fault is successfully reset, check the power supply voltage. If the power supply voltage is within the preset range, keep the reset command valid within the preset allowable abnormal time threshold, and judge whether there is a fault input release and the voltage returns to the preset value. Set the restartable range and one of the restartable working conditions with a drop before the voltage recovers. If there is one of the restartable working conditions, a restart command will be issued; if there is no restartable working condition, no restart command will be issued. Restart command, after the preset allowable abnormal time threshold passes, if the inverter fails to restart successfully, the reset command will be cancelled; if the power supply ...

Embodiment 3

[0069] A method for restarting an inverter, such as image 3 shown, including:

[0070] S11. After the frequency converter starts normally, if the fault input signal is obtained, output a reset command;

[0071] S12. If the inverter fault is successfully reset, check the power supply voltage. If the power supply voltage is within the preset range, keep the reset command valid within the preset allowable abnormal time threshold, and judge whether there is a fault input release and the voltage returns to the preset value. Set the startable range, and there are two restartable working conditions in which there is a drop or rise before the voltage is restored. If there are two restartable working conditions, a restart command will be issued; if there are no two restartable working conditions at the same time, Then the restart command will not be issued, and the reset command will be canceled if the inverter fails to restart after the preset allowable abnormal time threshold has p...

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PUM

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Abstract

The invention relates to the field of industrial control, and provides a frequency converter restarting method and a frequency converter restarting device, which are used for realizing quick resettingand restarting of a frequency converter after failure. The frequency converter restarting method which comprises the following steps: S11, acquiring a fault input signal, and outputting a reset instruction; S12, if the fault of the frequency converter is reset successfully, detecting a power supply voltage, and if the power supply voltage is within a preset range, sending a restarting instruction; and if the frequency converter fails and is not reset, stopping resetting and stopping sending a restarting instruction. Automatic restart of the frequency converter after shutdown caused by under-voltage, over-voltage, over-current or other instantaneous faults can be realized.

Description

technical field [0001] The invention relates to the field of industrial control, in particular to a method for restarting a frequency converter and a restarting device. Background technique [0002] With the ring network of the main power grid and the increase of power supply lines of the medium-voltage power grid of the enterprise, and the enterprise does not set up impedance isolation components to reduce power consumption, it is inevitable that when the main network or the adjacent line of the medium-voltage power grid of the enterprise fails The motor may stop working due to instantaneous loss of voltage or undervoltage (referred to as "shock power"). When the motor itself fails, it will also cause the entire inverter to stop. Some faults cannot be solved by restarting, such as short circuit on the load side, but some faults can be overcome by restarting. The perfect protection feature of the inverter itself, when the inverter fails, it will stop running and generate a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 程涛
Owner SHENZHEN BEITON CONTROL TECH
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