CN101826792A - Method for avoiding damage of frequency converter in stopping and restarting process - Google Patents
Method for avoiding damage of frequency converter in stopping and restarting process Download PDFInfo
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- CN101826792A CN101826792A CN 201010119699 CN201010119699A CN101826792A CN 101826792 A CN101826792 A CN 101826792A CN 201010119699 CN201010119699 CN 201010119699 CN 201010119699 A CN201010119699 A CN 201010119699A CN 101826792 A CN101826792 A CN 101826792A
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- frequency converter
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Abstract
The invention relates to a method for avoiding the damage of a frequency converter in the stopping and restarting process. A control system is provided in the method and comprises a button for controlling the starting of the frequency converter, a button for controlling the stop of the frequency converter, a PLC (Programmable Logic Controller) output point for controlling the starting and the stop of the frequency controller, a frequency converter operation state output point, an intermediate relay for restricting that the frequency converter can not be started while not completely stopping, a frequency converter stop state output point, a comparison point of rotating speed input fed back from a velocity-measuring sensor and a threshold value as well as a time-delay closing timer in a PLC. In the invention, the PLC with low cost is taken as a control core, the starting and the stop of the frequency converter are controlled by control logic of a PLC program, therefore, the frequency converter can be ensured to be restarted on the premise of completely stopping operating in heavy load, and the damage of the frequency converter, caused by the restarting of the frequency converter under the condition that the load is not completely stopped, is avoided.
Description
(1) technical field
The present invention relates to a kind of method of avoiding frequency converter in stopping and restarting process to damage, particularly when frequency converter stopped to restart after operation a period of time, because the system that misoperation causes frequency converter to damage prevents method.
(2) background technology
Frequency converter is widely used in the control system of industrial departments such as petrochemical industry, oil refining, electric power, medicine and light industry as a kind of speed control device.But because Control System Design is not good enough, converter parameter is provided with wrong, tends to make shorten greatly the useful life of frequency converter.Industrial widely used frequency converter all is that the correlation technique parameter is set earlier at present, comes into operation then.To the defence program of frequency converter seldom.Some user transfers to the acceleration and deceleration time below 1 second according to producing needs; frequency converter is often bad; when quickening too soon; current of electric is big; the frequency converter meeting volitional check output current that performance is good; prolong the accelerating time, the frequency converter of poor performance can reduce the life-span because electric current is big, and the accelerating time preferably is no less than 2 seconds.When slowing down too soon, frequency converter can be impacted by counter electromotive force of motor when stopping, and module is also damaged easily.For the very large big blower fan of inertia, although the parameter of frequency converter is provided with the enough acceleration and deceleration time, but, owing to the workman sees the demonstration that frequency converter stops sometimes and does not confirm whether blower fan has shut down, if blower fan does not shut down owing to inertia, this moment is because motor is to be in generating state, and the workman is starting in a flash when just starting frequency converter at this moment so, and the inner dc bus of frequency converter can produce overvoltage, cause overcurrent, thereby damage frequency converter.Therefore, it is particularly important to the useful life that prolongs frequency converter to prevent to restart after frequency converter from stopping not impaired method.
(3) summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, a kind of method of avoiding frequency converter in stopping and restarting process to damage is provided.
The object of the present invention is achieved like this: a kind of method of avoiding frequency converter in stopping and restarting process to damage, described method is a control system, this control system comprises a PLC, a frequency converter, a tachogenerator, the button that the control of conversion device starts, the button that the control of conversion device stops, the PLC output point of control of conversion device start and stop, a frequency converter running status output point, the auxiliary relay that the restriction frequency converter can not start when load does not stop fully, a frequency converter halted state output point, the timing closing timer among the rotating speed input value of tachogenerator feedback and threshold value comparison point and the PLC.
When 1) button that starts at described control of conversion device was pressed, the PLC output point control of conversion device of control of conversion device start and stop started; After frequency converter successfully starts, frequency converter running status output point output frequency converter operating state signal,
When 2) button that stops at described control of conversion device was pressed, the PLC output point control of conversion device of control of conversion device start and stop stopped; After frequency converter stops, frequency converter halted state output point output frequency converter halted state signal,
3) when described frequency converter operating state signal exists, the auxiliary relay that keeps the restriction frequency converter can not start when load does not stop fully is a closure state; When middle relay closes, the button that the control of conversion device starts will lose the startup function, thus the random startup of restriction frequency converter,
4) when described frequency converter halted state signal exists, and the tachometer value of tachogenerator feedback is less than 10 rev/mins rotating speed the time (this rotating speed can be adjusted, be provided with according to actual conditions), control system thinks that load stops, and the given button that the control of conversion device is started greater than the time-delay of the timing closing timer among 1 minute (this time can be adjusted, be provided with according to the actual loading situation) PLC back recovers the startup function.
The present invention has following advantage compared with prior art:
The present invention serves as the control core with PLC with low cost, come the startup of control of conversion device and stop by the control logic of PLC program, guarantee that frequency converter can be under the prerequisite that heavy load shuts down fully, restart frequency converter, avoid owing to load does not stop to restart the frequency converter damage that frequency converter causes fully.And it is simple to have equipment, easy to use, with low cost, and the characteristics that maintenance is little such as are easy to promote the use of at advantage.This guard method is applicable to the frequency converter of various models, can be widely used in industrial control fields such as petrochemical industry, oil refining, electric power, medicine and light industry.
(4) description of drawings
Fig. 1 is a Controlling Source program of the present invention (logic diagram).
Among the figure:
The button 1 that the control of conversion device starts, the button 2 that the control of conversion device stops, the PLC output point 3 of control of conversion device start and stop, frequency converter running status output point 4, the auxiliary relay 5 that the restriction frequency converter can not start when load does not stop fully, frequency converter halted state output point 6, the rotating speed input value and the threshold value comparison point 7 of tachogenerator feedback, timing closing timer 8 among the PLC, the normally-closed contact 9 of coil 5, the normally opened contact 10 of coil 3, the normally-closed contact 11 of timer 8, the normally opened contact 12 of coil 5, the state output contact (normally closed) 13 of frequency converter.
(5) embodiment
Referring to Fig. 1, Fig. 1 is a Controlling Source program of the present invention (logic diagram).As seen from Figure 1, a kind of method of avoiding frequency converter in stopping and restarting process to damage that the present invention relates to, described method is a control system, this control system comprises the button 1 that a control of conversion device starts, the button 2 that the control of conversion device stops, the PLC output point 3 of control of conversion device start and stop, a frequency converter running status output point 4, the auxiliary relay 5 that the restriction frequency converter can not start when load does not stop fully, timing closing timer 8 among the rotating speed input value of 6, one tachogenerators feedbacks of frequency converter halted state output point and threshold value comparison point 7 and the PLC.
When 1) button 1 that starts at described control of conversion device was pressed, the PLC output point 3 control of conversion devices of control of conversion device start and stop started; After frequency converter successfully starts, frequency converter running status output point 4 output frequency converter operating state signals,
When 2) button 2 that stops at described control of conversion device was pressed, the PLC output point 3 control of conversion devices of control of conversion device start and stop stopped; After frequency converter stops, frequency converter halted state output point 6 output frequency converter halted state signals,
3) when described frequency converter operating state signal exists, the auxiliary relay 5 that keeps the restriction frequency converter when load does not stop fully, can not start; When middle relay 5 is closed, the button 1 that the control of conversion device starts will lose the startup function, thus the random startup of restriction frequency converter,
4) when described frequency converter halted state signal exists, and the tachometer value of tachogenerator feedback is less than 10 rev/mins rotating speed the time (this rotating speed can be adjusted, be provided with according to actual conditions), control system thinks that load stops, and the given button 1 that the control of conversion device is started greater than the 8 time-delay backs of the timing closing timer among 1 minute (this time can be adjusted, be provided with according to the actual loading situation) PLC recovers the startup function.
Claims (1)
1. method of avoiding frequency converter in stopping and restarting process to damage, it is characterized in that: described method is a control system, this control system comprises the button that a control of conversion device starts, the button that the control of conversion device stops, the PLC output point of control of conversion device start and stop, a frequency converter running status output point, the auxiliary relay that the restriction frequency converter can not start when load does not stop fully, a frequency converter halted state output point, timing closing timer among the rotating speed input value of tachogenerator feedback and threshold value comparison point and the PLC
When 1) button that starts at described control of conversion device was pressed, the PLC output point control of conversion device of control of conversion device start and stop started; After frequency converter successfully starts, frequency converter running status output point output frequency converter operating state signal,
When 2) button that stops at described control of conversion device was pressed, the PLC output point control of conversion device of control of conversion device start and stop stopped; After frequency converter stops, frequency converter halted state output point output frequency converter halted state signal,
3) when described frequency converter operating state signal exists, the auxiliary relay that keeps the restriction frequency converter can not start when load does not stop fully is a closure state; When middle relay closes, the button that the control of conversion device starts will lose the startup function, thus the random startup of restriction frequency converter,
4) when described frequency converter halted state signal exists, and the tachometer value of tachogenerator feedback is less than 10 rev/mins rotating speed the time (this rotating speed can be adjusted, be provided with according to actual conditions), control system thinks that load stops, and the given button that the control of conversion device is started greater than the time-delay of the timing closing timer among 1 minute (this time can be adjusted, be provided with according to the actual loading situation) PLC back recovers the startup function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101196995A CN101826792B (en) | 2010-03-04 | 2010-03-04 | Method for avoiding damage of frequency converter in stopping and restarting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101196995A CN101826792B (en) | 2010-03-04 | 2010-03-04 | Method for avoiding damage of frequency converter in stopping and restarting process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101826792A true CN101826792A (en) | 2010-09-08 |
| CN101826792B CN101826792B (en) | 2012-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101196995A Expired - Fee Related CN101826792B (en) | 2010-03-04 | 2010-03-04 | Method for avoiding damage of frequency converter in stopping and restarting process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2906709Y (en) * | 2006-02-28 | 2007-05-30 | 南京工业大学 | Field bus-based distributed automatic control and protection system for coal mine emulsion pump station |
| CN101058487A (en) * | 2006-04-19 | 2007-10-24 | 襄樊金和环保科技有限公司 | Full-automatic water injector in shaft kiln |
| CN101299151A (en) * | 2008-05-10 | 2008-11-05 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Automatic control method of cable railway large load |
| CN101323890A (en) * | 2008-07-28 | 2008-12-17 | 中冶南方工程技术有限公司 | Converter oxygen lance anti-fall device and control method |
-
2010
- 2010-03-04 CN CN2010101196995A patent/CN101826792B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2906709Y (en) * | 2006-02-28 | 2007-05-30 | 南京工业大学 | Field bus-based distributed automatic control and protection system for coal mine emulsion pump station |
| CN101058487A (en) * | 2006-04-19 | 2007-10-24 | 襄樊金和环保科技有限公司 | Full-automatic water injector in shaft kiln |
| CN101299151A (en) * | 2008-05-10 | 2008-11-05 | 深圳市中金岭南有色金属股份有限公司凡口铅锌矿 | Automatic control method of cable railway large load |
| CN101323890A (en) * | 2008-07-28 | 2008-12-17 | 中冶南方工程技术有限公司 | Converter oxygen lance anti-fall device and control method |
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| Publication number | Publication date |
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| CN101826792B (en) | 2012-04-11 |
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Granted publication date: 20120411 Termination date: 20170304 |
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