CN112964953A - Frequency converter fault pre-diagnosis method and system - Google Patents
Frequency converter fault pre-diagnosis method and system Download PDFInfo
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Abstract
The application relates to a frequency converter fault pre-diagnosis method and a frequency converter fault pre-diagnosis system, wherein the method comprises the steps of obtaining working state information of a frequency converter and cutting off a power supply circuit of the frequency converter when the frequency converter stops working; electrifying each working unit in the frequency converter one by one and acquiring the working state of the corresponding working unit; and determining the working unit which does not work normally after being electrified as a fault unit and informing a worker. This application has the effect that improves converter maintenance efficiency.
Description
Technical Field
The application relates to the field of frequency converters, in particular to a frequency converter fault pre-diagnosis method and system.
Background
The frequency converter is a power control device which applies frequency conversion technology and microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor, and mainly comprises a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit, a detecting unit and a microprocessing unit.
Among the correlation technique, the converter is in the use, and certain or a plurality of unit damage inside the converter can appear after long-time work, and lead to the unable condition of working of converter, according to traditional mode this moment, the unable unit of confirming the damage of staff need unpack the converter apart, all inspects every unit, just can confirm the unit of damage again, overhauls, and efficiency is lower.
Disclosure of Invention
In order to improve the efficiency of frequency converter maintenance, the application provides a frequency converter fault pre-diagnosis method and system.
In a first aspect, the present application provides a method for pre-diagnosing a fault of a frequency converter, which adopts the following technical scheme:
a frequency converter fault pre-diagnosis method comprises the following steps:
acquiring working state information of the frequency converter and cutting off a power supply circuit of the frequency converter when the frequency converter stops working;
electrifying each working unit in the frequency converter one by one and acquiring the working state of the corresponding working unit;
and determining the working unit which does not work normally after being electrified as a fault unit and informing a worker.
Through adopting above-mentioned technical scheme, when the converter carries out the during operation, detect the operating condition of converter in real time to when the converter stop work, all carry out the circular telegram to every work cell in the converter and detect, with confirm the trouble work cell of unable work after circular telegram in all work cells, so that the staff only need overhaul the work cell of trouble, and then reducible staff's work load, improve the maintenance efficiency of converter.
Optionally, when the power supply circuit of the frequency converter is cut off, the method includes:
detecting the current residual condition of each working unit in the frequency converter;
marking the working unit with residual current as a residual unit;
carrying out multiple current residual condition detection on the residual unit at the same time interval until the residual current disappears;
recording the residual current detection time of the residual unit from the residual current detection starting time to the residual current disappearance time, and recording as the residual detection time.
By adopting the technical scheme, when the frequency converter stops working and cuts off the power supply circuit, a small amount of current can be remained in the working unit, the residual current is detected after the working unit is powered off, and the working unit with the residual current is electrified after the residual current disappears, so that the accuracy of electrifying detection of the working unit is improved.
Optionally, when the working unit is powered on, the method includes:
recording a working unit which does not normally work after being electrified at the first time, and recording the working unit as a pre-fault unit;
if the pre-fault unit is the same as the residual unit, fault judgment of corresponding residual detection time is carried out after continuous power-on;
and determining the pre-fault unit as a fault unit when the pre-fault unit does not work normally after the residual detection time passes.
By adopting the technical scheme, when the pre-fault unit is the same as the residual unit, temporary failure of components in the working unit occurs due to residual current, and fault judgment is performed in a mode of continuously electrifying residual detection time so as to better and clearly determine the occurrence condition of the pre-fault unit.
Optionally, when the working unit is powered on, if the pre-fault unit is different from the residual unit, the working unit is directly determined as the fault unit.
By adopting the technical scheme, when the pre-fault unit is not a residual unit, the pre-fault unit is a situation that the pre-fault unit is damaged.
Optionally, before the fault determination of the continuous power-on, the method includes:
detecting the current residual condition of the pre-fault unit;
directly judging the fault when no current remains in the pre-fault unit;
and when the current remains in the pre-fault unit, judging the fault after corresponding residual detection time.
By adopting the technical scheme, when the pre-fault unit is the same as the residual unit, the residual current detection is carried out to ensure that no residual current exists in the pre-fault unit, and the detection accuracy is improved.
Optionally, the method further includes:
a worker contact information database corresponding to the work unit and a residual worker contact information database corresponding to the residual unit are preset;
if the fault unit is a pre-fault unit which is the same as the residual unit, simultaneously selecting a corresponding worker contact way from the worker contact way database and the residual worker contact way database to inform;
and if the fault unit is a pre-fault unit different from the residual unit, selecting a corresponding worker contact way from the worker contact way database to notify.
By adopting the technical scheme, through setting the contact information database of the working personnel and the contact information database of the residual working personnel, more professional working personnel can be selected, and the overhauling accuracy of the working unit is favorably improved.
In a second aspect, the present application provides a frequency converter fault pre-diagnosis system, which adopts the following technical scheme:
a frequency converter fault pre-diagnosis system comprising:
the information acquisition module is used for acquiring the working state information of the frequency converter and cutting off a power supply circuit of the frequency converter when the frequency converter stops working;
the checking module is used for electrifying all the working units in the frequency converter one by one and acquiring the working states of the corresponding working units;
and the judgment notification module is used for determining the working unit which does not normally work after being electrified as a fault unit and notifying a worker.
Optionally, the method further includes:
the first detection module is used for detecting the current residual condition of each working unit in the frequency converter when the power supply circuit of the frequency converter is cut off;
the first marking module is used for marking the working unit with residual current as a residual unit;
the second detection module is used for carrying out multiple current residual condition detection on the residual unit at the same time interval until the residual current disappears;
and the recording module is used for recording the residual current starting detection time to the residual current disappearance time of the residual unit and recording the residual current starting detection time to the residual current disappearance time.
Optionally, the method further includes:
the second marking module is used for recording the working unit which does not normally work after being electrified for the first time when the working unit is electrified and recording the working unit as a pre-fault unit;
the judging module is used for continuously electrifying corresponding residual detection time to judge the fault when the pre-fault unit is the same as the residual unit, and determining the pre-fault unit as a fault unit when the pre-fault unit does not normally work after the residual detection time; on the contrary, when the pre-fault unit is different from the residual unit, the pre-fault unit is directly determined as a fault unit.
Optionally, the method further includes:
the third detection module is used for detecting the current residual condition of the pre-fault unit before the fault judgment of continuous energization, directly judging the fault when no current remains in the pre-fault unit, and otherwise, judging the fault after the corresponding residual detection time when the current remains in the pre-fault unit;
the database module is preset with a worker contact information database corresponding to the work unit and a residual worker contact information database corresponding to the residual unit;
if the fault unit is a pre-fault unit which is the same as the residual unit, the judgment notification module selects a corresponding worker contact way from the worker contact way database and the residual worker contact way database at the same time for notification;
and if the fault unit is a pre-fault unit different from the residual unit, the judgment and notification module selects a corresponding worker contact way from the worker contact way database to notify.
In summary, the present application includes at least one of the following beneficial technical effects:
when the frequency converter stops working, each working unit in the frequency converter is electrified and detected to determine a fault working unit, so that a worker only needs to overhaul the fault working unit, the workload of the worker is favorably reduced, and the overhaul efficiency of the frequency converter is improved.
Drawings
Fig. 1 is a first schematic step diagram of a method for pre-diagnosing a fault of a frequency converter in an embodiment of the present application.
Fig. 2 is a diagram of the principle steps of the frequency converter fault pre-diagnosis method in the embodiment of the present application.
Fig. 3 is a diagram of the third principle step of the frequency converter fault pre-diagnosis method in the embodiment of the present application.
Fig. 4 is a schematic structural diagram of a frequency converter fault pre-diagnosis system in the embodiment of the present application.
Description of reference numerals: 1. an information acquisition module; 2. an inspection module; 3. a judgment notification module; 4. a first detection module; 5. a first marking module; 6. a second detection module; 7. a recording module; 8. a second labeling module; 9. a judgment module; 10. a third detection module; 11. a database module; 12. a staff contact information database; 13. a database of remaining staff contact details.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-4 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a frequency converter fault pre-diagnosis method.
Referring to fig. 1, the frequency converter fault pre-diagnosis method comprises the following steps:
and S100, acquiring the working state information of the frequency converter and cutting off a power supply circuit of the frequency converter when the frequency converter stops working.
Specifically, when the frequency converter works, the working state of the frequency converter is monitored in real time, when the frequency converter stops working in normal working time, the condition that the frequency converter is damaged is shown, and the power supply circuit of the frequency converter can be cut off by pulling out the power line of the frequency converter at the moment so as to avoid continuous power supply of the power supply.
And step S200, electrifying each working unit in the frequency converter one by one and acquiring the working state of the corresponding working unit.
Specifically, according to working units such as a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit and a detecting unit which are arranged inside the frequency converter, current is introduced into each working unit in sequence, the working condition of the corresponding working unit is observed, and whether the working unit can work normally after being electrified is specifically observed.
And step S300, determining the working unit which does not work normally after being electrified as a fault unit and informing a worker.
Specifically, the work unit that does not damage under the normal condition still can carry out work after circular telegram alone, specifically can show as the internal circuit switches on, and can be for the fault unit to the work unit that can't carry out work after circular telegram alone, can inform the staff this moment only to overhaul the work unit of trouble, and need not to examine all work units in order to confirm the work unit of trouble, overhauls again, is favorable to improving the maintenance efficiency to the converter.
Referring to fig. 2, further, before the power supply circuit of the frequency converter is cut off for subsequent power-on detection, a small amount of current may remain in the working unit, and at this time, in order to ensure accuracy in the subsequent power-on detection of the working unit, it is necessary to ensure that no current exists in the working unit when the power-on detection of the working unit is performed.
In order to ensure that no residual current exists in an internal working unit after the frequency converter is powered off, the method specifically comprises the following steps:
and step S110, detecting the current residual condition of each working unit in the frequency converter.
Specifically, after a power supply circuit of the frequency converter is cut off, the current detector is used for detecting the internal current of the corresponding working unit according to the position of each working unit, so as to detect the residual current condition in the frequency converter, and it should be noted that the internal current detection of each working unit is performed simultaneously.
In step S120, the operation unit having the residual current is regarded as a residual unit.
Specifically, when the residual current detection is performed on the working unit, the working unit with the detected residual current is marked as a residual unit, so that the subsequent detection is facilitated.
In step S130, the residual unit is subjected to a plurality of current residual detection at the same time interval until the residual current disappears.
Specifically, when a plurality of residual units are present, each residual unit needs to be continuously detected until no current exists in the residual unit, and in order to ensure the accuracy of continuous detection, a plurality of residual units need to be detected simultaneously and repeatedly, and the time interval between each detection is the same.
In step S140, the residual current detection time of the residual unit from the residual current start time to the residual current disappearance time is recorded and recorded as the residual detection time.
Specifically, the residual current starting detection time is current detection time performed by using a current detector for the first time after the power supply of the frequency converter is disconnected, the residual current disappearance time is time for detecting the disappearance of the current by using the current detector after the interval time, and the time difference between the residual current starting detection time and the residual current disappearance time is the residual detection time.
Referring to fig. 3, further, when power is supplied to the working unit after the residual current detection, the method specifically includes the following steps:
and step S210, recording the working units which do not normally work after the first time of electrification, and recording as pre-fault units.
Specifically, the first time is preferably a time when the power supply is connected, and after all the working units are sequentially powered on, if the working units do not work normally, that is, the circuit is not turned on, the working units of the part are marked as pre-fault units.
Step S220, if the pre-fault unit is the same as the residual unit, performing fault judgment for corresponding residual detection time by continuing power-on.
Specifically, when the residual unit marked during the residual current detection and the pre-fault unit marked during the power-on detection are the same working unit, taking the rectifying unit in the frequency converter as an example, when the residual current detection is performed, the residual current exists in the rectifying unit, and the rectifying current does not work normally after the power-on, which is the same condition of the pre-fault unit and the residual unit in the embodiment, the power needs to be continuously supplied to the rectifying unit at this time, and the continuous time is the residual detection time corresponding to the rectifying unit.
The reason that the pre-fault unit is the same as the residual unit and the continuous power-on residual detection time is that after the circuit is cut off, the current in the working unit does not directly disappear but remains, the residual current cannot naturally flow due to no power-on, and the situation that the components in the working unit are damaged exists in the process of gradually disappearing along with the time, certainly, the components in the working unit cannot be damaged, only the components in the working unit temporarily fail due to the existence of the residual current, and in addition, the residual current possibly remains due to the fact that the current cannot smoothly flow due to the fault of the working unit, so that the situation that the damage of the working unit does exist can be better determined by continuously powering on the working unit like a rectifying unit.
In step S230, the pre-fault unit is determined as a fault unit when the pre-fault unit does not work normally after the residual detection time elapses.
Specifically, when the pre-fault unit is the same as the residual unit, it can be determined that the pre-fault unit is damaged if the pre-fault unit still cannot normally operate after being continuously powered on, whereas if the pre-fault unit can normally operate after being continuously powered on, it indicates that the pre-fault unit can normally operate.
In step S240, when the power is supplied to the working unit, if the pre-fault unit is different from the residual unit, the working unit is directly determined as the fault unit.
Specifically, when the pre-fault unit generated after the power-on is not a residual unit, it indicates that the pre-fault unit is actually damaged, and it is necessary to notify the worker.
Further, when the power supply determines that the pre-fault unit is the same as the residual unit, since the power supply is just passed through, it is necessary to ensure that there is no residual current inside the pre-fault unit before continuing to supply power to the pre-fault unit for subsequent fault determination, and the method specifically includes the following steps:
step S221 detects a current residual condition of the pre-fault unit.
Specifically, according to the position of the pre-fault unit, the same current detector for detecting the position is used for detecting the internal current, so that the current residual condition in the pre-fault unit is detected.
In step S222, a fault is directly determined when no current remains in the pre-fault unit.
In step S223, when there is a current residual in the pre-fault unit, a fault determination is performed after a corresponding residual detection time elapses.
Specifically, when the current detector detects that no residual current exists in the pre-fault unit, continuous energization is directly performed to judge the subsequent fault condition; when the current detector detects that residual current exists in the pre-fault unit, the current detector is used for detecting after the residual detection time corresponding to the pre-fault unit, and at the moment, subsequent fault judgment can be carried out if no current exists, otherwise, if the current still exists, the pre-fault unit can be judged to have a fault.
Further, in this embodiment, a staff contact information database corresponding to the work unit and a residual staff contact information database corresponding to the residual unit are preset, specifically, each work unit has a corresponding maintenance staff, and when the work unit becomes the residual unit, the damage property of the work unit is changed and then there is a corresponding staff.
When a fault work unit is determined and workers are notified, the method specifically comprises the following steps:
in step S250, if the fault unit is a pre-fault unit identical to the residual unit, the corresponding staff contact is selected from the staff contact database and the residual staff contact database at the same time for notification.
Specifically, after the pre-fault unit is determined, the pre-fault unit is the same as the residual unit and is determined as the fault unit through continuous power-on, it indicates that the working unit corresponding to the pre-fault unit is changed due to current detention after power-off, and at the moment, the working personnel in the working personnel contact information database and the working personnel in the residual working personnel contact information database can be simultaneously notified to carry out maintenance.
Step S260, if the fault unit is a pre-fault unit different from the residual unit, selecting a corresponding worker contact way from the worker contact way database for notification.
Specifically, when the pre-fault unit is determined and is different from the residual unit, it indicates that the working unit corresponding to the pre-fault unit is normally damaged, and at this time, only the staff in the staff contact information database may be notified.
The embodiment of the application also discloses a frequency converter fault pre-diagnosis system
Referring to fig. 4, the frequency converter fault pre-diagnosis system includes an information acquisition module 1, a checking module 2 and a judgment notification module 3; the information acquisition module 1 is used for acquiring the working state information of the frequency converter and cutting off a power supply circuit of the frequency converter when the frequency converter stops working; the checking module 2 is used for electrifying each working unit in the frequency converter one by one and acquiring the working state of the corresponding working unit; the judgment and notification module 3 is used for determining the working unit which does not work normally after being electrified as a fault unit and notifying a worker.
Furthermore, before the power supply circuit of the frequency converter is cut off for subsequent power-on detection, a small amount of current can be remained in the working unit, and at the moment, in order to ensure the accuracy of the subsequent power-on detection of the working unit, the working unit needs to be ensured to have no current when the power-on detection of the working unit is carried out.
In order to ensure that no residual current exists in the internal working unit after the frequency converter is powered off, the frequency converter further comprises a first detection module 4, a first marking module 5, a second detection module 6 and a recording module 7; the first detection module 4 is used for detecting the current residual condition of each working unit in the frequency converter when the power supply circuit of the frequency converter is cut off; the first marking module 5 is used for marking the working unit with residual current as a residual unit; the second detection module 6 is used for carrying out multiple current residual condition detections on the residual unit at the same time interval until the residual current disappears; the recording module 7 is used for recording the residual current starting detection time to the residual current disappearance time of the residual unit and recording the residual current starting detection time to the residual current disappearance time.
Further, the system also comprises a second marking module 8, a judging module 9, a third detecting module 10 and a database module 11; the second marking module 8 is used for recording the working unit which does not normally work after being electrified for the first time when the working unit is electrified, and recording the working unit as a pre-fault unit; the judging module 9 is configured to continuously power on the corresponding residual detection time to perform fault judgment when the pre-fault unit is the same as the residual unit, and determine the pre-fault unit as a fault unit when the pre-fault unit does not normally work after the residual detection time elapses; on the contrary, when the pre-fault unit is different from the residual unit, the pre-fault unit is directly determined as a fault unit; the third detection module 10 is configured to detect a current residual condition of the pre-fault unit before performing fault determination of continuous power-on, directly perform fault determination when no current remains in the pre-fault unit, and otherwise perform fault determination after a corresponding residual detection time elapses first when a current remains in the pre-fault unit.
A worker contact information database 12 corresponding to the work unit and a residual worker contact information database 13 corresponding to the residual unit are preset in the database module 11; if the fault unit is a pre-fault unit which is the same as the residual unit, the judgment and notification module 3 selects a corresponding worker contact way from the worker contact way database 12 and the residual worker contact way database 13 at the same time to notify; if the fault unit is a pre-fault unit different from the residual unit, the judgment and notification module 3 selects a corresponding staff contact address from the staff contact address database 12 for notification.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (10)
1. A frequency converter fault pre-diagnosis method is characterized by comprising the following steps: the method comprises the following steps:
acquiring working state information of the frequency converter and cutting off a power supply circuit of the frequency converter when the frequency converter stops working;
electrifying each working unit in the frequency converter one by one and acquiring the working state of the corresponding working unit;
and determining the working unit which does not work normally after being electrified as a fault unit and informing a worker.
2. The frequency converter fault pre-diagnosis method according to claim 1, characterized in that: when cutting off converter supply circuit, include:
detecting the current residual condition of each working unit in the frequency converter;
marking the working unit with residual current as a residual unit;
carrying out multiple current residual condition detection on the residual unit at the same time interval until the residual current disappears;
recording the residual current detection time of the residual unit from the residual current detection starting time to the residual current disappearance time, and recording as the residual detection time.
3. The frequency converter fault pre-diagnosis method according to claim 2, characterized in that: when said circular telegram to the work cell inside, include:
recording a working unit which does not normally work after being electrified at the first time, and recording the working unit as a pre-fault unit;
if the pre-fault unit is the same as the residual unit, fault judgment of corresponding residual detection time is carried out after continuous power-on;
and determining the pre-fault unit as a fault unit when the pre-fault unit does not work normally after the residual detection time passes.
4. The frequency converter fault pre-diagnosis method according to claim 3, characterized in that: and when the working unit is electrified, if the pre-fault unit is different from the residual unit, the working unit is directly determined as a fault unit.
5. The frequency converter fault pre-diagnosis method according to claim 3, characterized in that: before the fault judgment of continuous power-on, the method comprises the following steps:
detecting the current residual condition of the pre-fault unit;
directly judging the fault when no current remains in the pre-fault unit;
and when the current remains in the pre-fault unit, judging the fault after corresponding residual detection time.
6. The frequency converter fault pre-diagnosis method according to claim 3, characterized in that: further comprising:
a worker contact information database corresponding to the work unit and a residual worker contact information database corresponding to the residual unit are preset;
if the fault unit is a pre-fault unit which is the same as the residual unit, simultaneously selecting a corresponding worker contact way from the worker contact way database and the residual worker contact way database to inform;
and if the fault unit is a pre-fault unit different from the residual unit, selecting a corresponding worker contact way from the worker contact way database to notify.
7. A frequency converter fault pre-diagnosis system is characterized in that: the method comprises the following steps:
the information acquisition module (1) is used for acquiring the working state information of the frequency converter and cutting off a power supply circuit of the frequency converter when the frequency converter stops working;
the checking module (2) is used for electrifying all the working units in the frequency converter one by one and acquiring the working states of the corresponding working units;
and the judgment notification module (3) is used for determining the working unit which does not normally work after being electrified as a fault unit and notifying a worker.
8. The frequency converter fault pre-diagnosis system according to claim 7, characterized in that: further comprising:
the first detection module (4) is used for detecting the current residual condition of each working unit in the frequency converter when the power supply circuit of the frequency converter is cut off;
the first marking module (5) is used for marking the working unit with residual current as a residual unit;
the second detection module (6) is used for carrying out multiple current residual condition detection on the residual unit at the same time interval until the residual current disappears;
and the recording module (7) is used for recording the residual current starting detection time to the residual current disappearance time of the residual unit and recording the residual current starting detection time to the residual current disappearance time.
9. The frequency converter fault pre-diagnosis system according to claim 8, characterized in that: further comprising:
the second marking module (8) is used for recording the working unit which does not normally work after being electrified at the first time when the working unit is electrified, and recording the working unit as a pre-fault unit;
the judging module (9) is used for continuously electrifying corresponding residual detection time to judge the fault when the pre-fault unit is the same as the residual unit, and determining the pre-fault unit as a fault unit when the pre-fault unit does not normally work after the residual detection time; on the contrary, when the pre-fault unit is different from the residual unit, the pre-fault unit is directly determined as a fault unit.
10. The frequency converter fault pre-diagnosis system according to claim 9, characterized in that: further comprising:
the third detection module (10) is used for detecting the current residual condition of the pre-fault unit before the fault judgment of continuous power-on, directly judging the fault when no current remains in the pre-fault unit, and otherwise, judging the fault after the corresponding residual detection time when the current remains in the pre-fault unit;
the database module (11) is preset with a staff contact information database (12) corresponding to the working unit and a residual staff contact information database (13) corresponding to the residual unit;
if the fault unit is a pre-fault unit which is the same as the residual unit, the judgment notification module (3) selects a corresponding worker contact way from the worker contact way database (12) and the residual worker contact way database (13) to notify;
if the fault unit is a pre-fault unit different from the residual unit, the judgment notification module (3) selects a corresponding worker contact way from the worker contact way database (12) for notification.
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