CN220449596U - Device for improving master-slave control safety operation of frequency converter - Google Patents
Device for improving master-slave control safety operation of frequency converter Download PDFInfo
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- CN220449596U CN220449596U CN202323214242.4U CN202323214242U CN220449596U CN 220449596 U CN220449596 U CN 220449596U CN 202323214242 U CN202323214242 U CN 202323214242U CN 220449596 U CN220449596 U CN 220449596U
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- control system
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- gear
- frequency converter
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- 238000004891 communication Methods 0.000 claims abstract description 5
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Abstract
The device comprises a PLC control system and two frequency converters connected with the PLC control system, wherein the PLC control system is also connected with a gear control system and a limit signal, so that the PLC control system receives the gear signal and the limit signal from the gear control system; and the PLC control system is connected with a touch screen. Each frequency converter is provided with a communication card. According to the novel control circuit, the state parameters of the two frequency converters and the external safety feedback signals are all read into the PLC, data operation is performed in the PLC, when the abnormal difference of the operating state parameters of one or the two frequency converters is too large, the PLC outputs a shutdown instruction, and the touch screen prompts abnormal data details, so that the safe operation effect is achieved.
Description
Technical Field
The utility model relates to the field of cranes, in particular to a crane electric control system comprising a PLC control system.
Background
With the development of a speed regulating system of a crane frequency converter, more and more cranes adopt frequency converter control, particularly master-slave control of two frequency converters of a lifting mechanism of a casting crane, which has extremely high requirements on safety and reliability, the traditional control scheme is not suitable for the requirements, and the technology of the utility model is a novel control circuit designed for solving the problems.
Disclosure of Invention
The utility model aims to solve the technical problems that: aiming at the master-slave control requirement of two frequency converters of the existing lifting mechanism of the casting crane, the device for improving the master-slave control safety operation of the frequency converters is provided.
In order to achieve the above purpose, the utility model is realized by the following technical scheme:
the device comprises a PLC control system and two frequency converters connected with the PLC control system, wherein the PLC control system is also connected with a gear control system and a limit signal, so that the PLC control system receives the gear signal and the limit signal from the gear control system; and the PLC control system is connected with a touch screen.
Each frequency converter is provided with a communication card.
Compared with the prior art, the utility model has the following beneficial effects: through this novel control circuit, with the state parameter and the outside safe feedback signal of two converters all read to PLC in, carry out data operation in PLC is inside, and when one or two converters are too big in the unusual difference of running state parameter, PLC output shut down instruction, the suggestion unusual data detail on the touch-sensitive screen reaches safe operation effect.
Drawings
Fig. 1 is a functional block diagram of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
As shown in FIG. 1, the device for improving the master-slave control safety operation of the frequency converters comprises a PLC control system and two frequency converters connected with the PLC control system, wherein the PLC control system is also connected with a gear control system and a limit signal, so that the PLC control system receives the gear signal and the limit signal from the gear control system; and the PLC control system is connected with a touch screen.
Further, each frequency converter is provided with a communication card.
The working principle of the utility model is as follows:
the PLC control system and the two frequency converters are in master-slave control, signals such as rotating speed, current, voltage and the like when the two frequency converters normally operate are read in real time through a communication card, state parameter values of the two frequency converters are compared and calculated in real time in the PLC control system according to the frequency converter data difference value set in the PLC control system, the signals such as the rotating speed, the current, the voltage and the like of the two frequency converters are detected to exceed the data difference value set in the PLC control system in the running process, or the PLC control system immediately outputs a shutdown command when the actions of an external output relay of the frequency converters are asynchronous with the built-in command of the frequency converters.
The PLC control system and the frequency converter control system can ensure real-time detection of the running states of two frequency converters controlled by the lifting mechanism in a master-slave mode, a stop command is sent out at the first time when abnormality occurs, abnormal details are displayed on the cab monitoring screen, the fault maintenance efficiency is improved, serious accidents are avoided, and the working reliability of the crane is improved.
In the PLC control system, the data detected in real time is compared with the preset value, and the comparison process is the prior art.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several changes and modifications can be made without departing from the general inventive concept, and these should also be regarded as the scope of the utility model.
Claims (2)
1. The utility model provides an improve converter master-slave control safe operation device which characterized in that: the device comprises a PLC control system and two frequency converters connected with the PLC control system, wherein the PLC control system is also connected with a gear control system and a limit signal, so that the PLC control system receives the gear signal and the limit signal from the gear control system; and the PLC control system is connected with a touch screen.
2. The device for improving master-slave control safety operation of a frequency converter according to claim 1, wherein: each frequency converter is provided with a communication card.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323214242.4U CN220449596U (en) | 2023-11-28 | 2023-11-28 | Device for improving master-slave control safety operation of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323214242.4U CN220449596U (en) | 2023-11-28 | 2023-11-28 | Device for improving master-slave control safety operation of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220449596U true CN220449596U (en) | 2024-02-06 |
Family
ID=89729072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323214242.4U Active CN220449596U (en) | 2023-11-28 | 2023-11-28 | Device for improving master-slave control safety operation of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220449596U (en) |
-
2023
- 2023-11-28 CN CN202323214242.4U patent/CN220449596U/en active Active
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