CN112964953B - Frequency converter fault pre-diagnosis method and system - Google Patents
Frequency converter fault pre-diagnosis method and system Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The application relates to a frequency converter fault pre-diagnosis method and a system, which comprise 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 all working units 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 notifying the working personnel. The application has the effect of improving the overhaul efficiency of the frequency converter.
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 an electric power control device for controlling the AC motor by changing the frequency of the working power supply of the motor by applying the frequency conversion technology and the microelectronics technology, and mainly comprises a rectifying unit, a filtering unit, an inversion unit, a braking unit, a driving unit, a detecting unit and a micro-processing unit.
In the related art, in the use process of the frequency converter, damage to one or more units inside the frequency converter can occur after long-time work, so that the frequency converter cannot work, at the moment, according to a traditional mode, workers cannot determine the damaged units, the frequency converter needs to be disassembled, each unit is checked, the damaged units can be determined, overhaul is performed again, and the efficiency is low.
Disclosure of Invention
In order to improve the efficiency of overhauling the frequency converter, the application provides a frequency converter fault pre-diagnosis method and a frequency converter fault pre-diagnosis system.
In a first aspect, the present application provides a method for pre-diagnosing faults of a frequency converter, which adopts the following technical scheme:
A frequency converter fault pre-diagnosis method, comprising:
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 all working units 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 notifying the working personnel.
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 stops working, all carry out the circular telegram to every work unit in the converter and detect, in order to confirm the trouble work unit that can't work after the circular telegram in all work units, with the staff only need overhaul the work unit of trouble, and then reducible staff's work load improves 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;
the working unit with residual current is marked as a residual unit;
Detecting the residual current condition of the residual unit for a plurality of times at equal intervals until the residual current disappears;
The residual current start detection time to the residual current extinction time of the residual unit are recorded and recorded as the residual detection time.
Through adopting above-mentioned technical scheme, when the converter stops working and cuts off power supply circuit, can remain a small amount of electric current in the work unit, through the detection to the residual current behind the work unit outage to detect to the work unit that has residual current and carry out the circular telegram again after the residual current disappears, in order to improve the accuracy to work unit circular telegram detection.
Optionally, when the power is applied to the working unit, the method includes:
Recording a working unit which does not work normally after the first time is electrified, and recording the working unit as a pre-fault unit;
if the pre-fault unit is the same as the residual unit, performing fault judgment of the corresponding residual detection time of 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.
Through adopting above-mentioned technical scheme, when the prefault unit is the same with remaining unit, there is the condition that causes the components and parts in the work unit to appear temporarily malfunctioning owing to remaining current, carries out the trouble judgement through the mode of lasting circular telegram residual detection time to better clear and determine the condition that prefault unit appears.
Optionally, when the power is applied to the working unit, if the pre-fault unit is different from the residual unit, the pre-fault unit is directly determined as the fault unit.
By adopting the technical scheme, when the pre-fault unit is not the residual unit, the pre-fault unit is indicated to be in a damaged condition.
Optionally, before the fault determination of the continuous power-on, the method includes:
Detecting the current residual condition of the pre-fault unit;
Directly performing fault judgment when no current remains in the pre-fault unit;
when current remains in the pre-fault unit, corresponding residual detection time is passed before fault judgment is carried out.
Through adopting above-mentioned technical scheme, when the prefault unit is the same with the residual unit, through the residual current detection with guarantee that the inside no residual current of prefault unit, improve the accuracy nature of detection.
Optionally, the method further comprises:
presetting a worker contact information database corresponding to the working unit and a residual worker contact information database corresponding to the residual unit;
If the fault unit is the pre-fault unit which is the same as the residual unit, selecting corresponding staff contact information from the staff contact information database and the residual staff contact information database for notification;
If the fault unit is a pre-fault unit different from the residual unit, selecting a corresponding staff contact way from the staff contact way database for notification.
Through adopting above-mentioned technical scheme, through setting up staff contact information database and remaining staff contact information database, can select more professional staff, be favorable to improving the maintenance accuracy to the work unit.
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-diagnostic 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 working units in the frequency converter one by one and acquiring the working state of the corresponding working unit;
And the judging and notifying module is used for determining the working unit which does not work normally after being electrified as a fault unit and notifying the working personnel.
Optionally, the method further comprises:
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;
a first marking module for marking the working unit with residual current as a residual unit;
The second detection module is used for detecting the current residual condition of the residual unit for a plurality of times 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 be the residual detection time.
Optionally, the method further comprises:
the second marking module is used for recording the working unit which does not work normally after the first time of power on when the working unit is electrified, and recording the working unit as a pre-fault unit;
The judging module is used for continuously powering on corresponding residual detection time to judge faults 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 work normally after the residual detection time passes; otherwise, when the pre-failure unit is different from the residual unit, the pre-failure unit is directly determined as the failure unit.
Optionally, the method further comprises:
The third detection module is used for detecting the current residual condition of the pre-fault unit before the fault judgment of continuous power-on, and directly carrying out fault judgment when no current remains in the pre-fault unit, otherwise, carrying out fault judgment after corresponding residual detection time when current remains in the pre-fault unit;
The database module is preset with a worker contact information database corresponding to the working unit and a residual worker contact information database corresponding to the residual unit;
if the fault unit is the pre-fault unit which is the same as the residual unit, the judging and notifying module selects corresponding staff contact ways from the staff contact way database and the residual staff contact way database to notify;
And if the fault unit is a pre-fault unit different from the residual unit, the judging and notifying 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 reduced, and the overhaul efficiency of the frequency converter is improved.
Drawings
Fig. 1 is a schematic step diagram of a frequency converter fault pre-diagnosis method according to an embodiment of the present application.
Fig. 2 is a schematic step diagram of a frequency converter fault pre-diagnosis method according to an embodiment of the present application.
Fig. 3 is a schematic step diagram of a frequency converter fault pre-diagnosis method according to an embodiment of the present application.
Fig. 4 is a schematic block diagram of a frequency converter fault pre-diagnosis system according to an embodiment of the present application.
Reference numerals illustrate: 1. an information acquisition module; 2. an inspection module; 3. judging a notification module; 4. a first detection module; 5. a first marking module; 6. a second detection module; 7. a recording module; 8. a second marking module; 9. a judging module; 10. a third detection module; 11. a database module; 12. a staff contact database; 13. and a residual staff contact information database.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings 1 to 4 and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the 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 includes the steps of:
Step S100, the working state information of the frequency converter is obtained, and the power supply circuit of the frequency converter is cut off 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 situation that damage occurs in the frequency converter is indicated, and at the moment, the power supply circuit of the frequency converter can be cut off by pulling out the power line of the frequency converter so as to avoid continuous power supply of a power supply.
Step S200, electrifying all working units 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 inversion unit, a braking unit, a driving unit and a detection unit and the like in the frequency converter, current is sequentially introduced into each working unit, and working conditions of the corresponding working units are observed, specifically, whether the working units can work normally after being electrified or not is observed.
And step S300, the working unit which does not work normally after being electrified is determined as a fault unit, and a worker is notified.
Specifically, the working unit which is not damaged under normal conditions still works after being electrified independently can be specifically represented by that an internal circuit is conducted, the working unit which cannot work after being electrified independently can be defined as a fault unit, and at the moment, workers can be informed of maintenance of the fault working unit only, and all the working units are not required to be checked to determine the fault working unit, and maintenance is carried out again, so that maintenance efficiency of the frequency converter is improved.
Referring to fig. 2, further, a small amount of current remains in the working unit before the power supply circuit of the frequency converter is cut off for subsequent power-on detection, and in order to ensure the accuracy in the subsequent power-on detection of the working unit, it is necessary to ensure that no current exists in the working unit during the power-on detection of the working unit.
In order to ensure that no residual current exists in an internal working unit after the frequency converter cuts off a power supply, the method specifically comprises the following steps:
step S110, detecting the current residual condition of each working unit in the frequency converter.
Specifically, after the 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 current residual condition in the frequency converter, and the internal current detection of each working unit is performed simultaneously.
In step S120, the operation unit in which the residual current exists is referred to as a residual unit.
Specifically, when detecting the residual current of the working unit, the working unit with the detected residual current is marked as the residual unit, so that the subsequent detection can be conveniently performed.
In step S130, the residual unit is subjected to multiple current residual condition detection at equal intervals until the residual current disappears.
Specifically, when a plurality of residual units occur, 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, the plurality of residual units need to be simultaneously and repeatedly detected, and the time interval between each detection is the same.
In step S140, the residual current start detection time to the residual current vanishing time of the residual unit is recorded and is referred to as the residual detection time.
Specifically, the residual current start detection time is the current detection time performed by using the current detector for the first time after the power supply of the frequency converter is disconnected, the residual current disappearance time is the time when the current disappearance is detected by using the current detector after the interval time, and the time difference between the current detection time and the residual current disappearance time is the residual detection time.
Referring to fig. 3, further, when power is applied to the working unit after residual current detection, the method specifically includes the following steps:
Step S210, recording a working unit which does not work normally after the first time of power-on, and recording the working unit as a pre-fault unit.
Specifically, the first time is preferably the time of power supply connection, and after all the working units are powered on in sequence, if the working units do not work normally, that is, the circuit is not conducted, the working units are marked as pre-fault units.
Step S220, if the pre-fault unit is the same as the residual unit, fault judgment of the corresponding residual detection time of continuous power-on is performed.
Specifically, when the residual unit marked during residual current detection and the pre-fault unit marked during power-on detection are the same working unit, taking a rectifying unit in the frequency converter as an example, when residual current detection is performed, residual current exists in the rectifying unit, and after power-on, the rectifying current does not work normally, namely the situation that the pre-fault unit and the residual unit are the same in the embodiment, at this time, power-on needs to be continuously performed in the rectifying unit, and the duration time is the residual detection time corresponding to the rectifying unit.
The reason for the continuous power-on residual detection time for the pre-fault unit is that after a circuit is cut off, current in the working unit does not directly disappear, but remains, the residual current cannot naturally flow due to the fact that the residual current cannot flow, components in the working unit are damaged in the process of gradually disappearing along with time, the components in the working unit cannot be damaged, the components in the working unit can temporarily fail due to the existence of the residual current, and in addition, the residual current can be retained due to the fact that the current cannot smoothly flow due to the fact that the working unit is faulty, and therefore the working unit like a rectifying unit is continuously electrified, and the fact that the working unit is damaged can be well determined.
In step S230, the pre-failure unit is determined as a failure unit when the pre-failure unit does not normally operate after the residual detection time.
Specifically, when the pre-fault unit is the same as the residual unit, the pre-fault unit can be judged to be damaged after the pre-fault unit is continuously electrified, otherwise, the pre-fault unit can normally work after the pre-fault unit is continuously electrified, and the pre-fault unit can normally work.
In step S240, when the power is applied to the working unit, if the pre-failure unit is different from the residual unit, the pre-failure unit is directly determined as the failure unit.
Specifically, if the pre-failure unit generated after the power-on is not a residual unit, it indicates that the pre-failure unit is indeed damaged, and the worker needs to be notified.
Further, when the pre-fault unit is the same as the residual unit in the power-on judgment, the power-on is just passed, so that the situation that no residual current exists inside the pre-fault unit needs to be ensured before the subsequent fault judgment is carried out by continuously powering on the pre-fault unit, specifically comprising the following steps:
In step S221, the current residual condition of the pre-fault unit is detected.
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 detection of the current residual condition in the pre-fault unit is realized.
In step S222, the fault determination is directly performed when no current remains in the pre-fault unit.
In step S223, when there is a current residual in the pre-fault unit, a corresponding residual detection time is first elapsed, and then fault determination is performed.
Specifically, when the current detector detects that no residual current exists in the pre-fault unit, continuous power-on 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 detects the residual current after the residual detection time corresponding to the pre-fault unit, and if no current exists at this time, the subsequent fault judgment can be performed, otherwise, if current still exists at this time, the pre-fault unit can also be judged to have faults.
Further, in this embodiment, a worker contact database corresponding to the working unit and a residual worker contact database corresponding to the residual unit are preset, specifically, each working unit has a corresponding maintenance worker, and when the working unit is changed to the residual unit, the corresponding worker is also present after the damage property of the working unit is changed.
When determining a faulty working unit and notifying a worker, the method specifically comprises the following steps:
Step S250, if the fault unit is the same pre-fault unit as the residual unit, selecting corresponding worker contact information from the worker contact information database and the residual worker contact information database at the same time for notification.
Specifically, after the pre-fault unit is determined and is identical to the residual unit and is determined to be a fault unit through continuous power-on, the working unit corresponding to the pre-fault unit is indicated to be changed in current retention 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 informed to carry out maintenance.
In step S260, if the failed unit is a pre-failed unit different from the residual unit, a corresponding worker contact is selected from the worker contact database for notification.
Specifically, when the pre-fault unit is determined and the pre-fault unit is different from the residual unit, the working unit corresponding to the pre-fault unit is indicated to be damaged normally, and at the moment, only the staff in the staff contact information database can 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, an inspection module 2, and a judgment notification module 3; the information acquisition module 1 is used for 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; the checking module 2 is used for electrifying all working units in the frequency converter one by one and acquiring the working state of the corresponding working unit; the judgment notification module 3 is used for determining a working unit which does not work normally after being electrified as a fault unit and notifying a worker.
Furthermore, a small amount of current will remain in the working unit before the power supply circuit of the frequency converter is cut off to perform subsequent power-on detection, and at this time, in order to ensure the 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 is performed on the working unit.
In order to ensure that no residual current exists in an internal working unit after the frequency converter cuts off a power supply, the application also 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 a working unit with residual current as a residual unit; the second detection module 6 is used for detecting the residual current condition of the residual unit for a plurality of times at equal intervals until the residual current disappears; the recording module 7 is used for recording the residual current start detection time to the residual current disappearance time of the residual unit, and recording the residual current start detection time as the residual detection time.
Further, the application 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 work normally after the first time of power-on when the working unit is powered on, and recording the working unit as a pre-fault unit; the judging module 9 is used for continuously powering on corresponding residual detection time to judge faults 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 work normally after the residual detection time passes; otherwise, 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, and directly perform fault determination when no current remains in the pre-fault unit, otherwise, perform fault determination after a corresponding residual detection time passes when current remains in the pre-fault unit.
The database module 11 is preset with a worker contact information database 12 corresponding to the working unit and a residual worker contact information database 13 corresponding to the residual unit; if the fault unit is the same pre-fault unit as the residual unit, the judging and notifying module 3 selects corresponding staff contact ways from the staff contact way database 12 and the residual staff contact way database 13 for notification; if the faulty unit is a pre-faulty unit different from the residual unit, the judgment notification module 3 selects a corresponding worker contact manner from the worker contact manner database 12 to notify.
The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (6)
1. A frequency converter fault pre-diagnosis method is characterized in that: comprising 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 all working units in the frequency converter one by one and acquiring the working state of the corresponding working unit;
the working unit which does not work normally after being electrified is determined as a fault unit and a worker is notified;
When the power supply circuit of the frequency converter is cut off, the frequency converter comprises:
detecting the current residual condition of each working unit in the frequency converter;
the working unit with residual current is marked as a residual unit;
Detecting the residual current condition of the residual unit for a plurality of times at equal intervals until the residual current disappears;
recording the residual current starting detection time to the residual current vanishing time of the residual unit, and recording the residual current vanishing time as the residual detection time;
When the power is applied to the working unit, the method comprises the following steps:
Recording a working unit which does not work normally after the first time is electrified, and recording the working unit as a pre-fault unit;
if the pre-fault unit is the same as the residual unit, performing fault judgment of the corresponding residual detection time of 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.
2. The frequency converter fault pre-diagnosis method according to claim 1, characterized in that: and 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 a fault unit.
3. The frequency converter fault pre-diagnosis method according to claim 1, characterized in that: before the fault judgment of the continuous power-on, the method comprises the following steps:
Detecting the current residual condition of the pre-fault unit;
Directly performing fault judgment when no current remains in the pre-fault unit;
when current remains in the pre-fault unit, corresponding residual detection time is passed before fault judgment is carried out.
4. The frequency converter fault pre-diagnosis method according to claim 1, characterized in that: further comprises:
presetting a worker contact information database corresponding to the working unit and a residual worker contact information database corresponding to the residual unit;
If the fault unit is the pre-fault unit which is the same as the residual unit, selecting corresponding staff contact information from the staff contact information database and the residual staff contact information database for notification;
If the fault unit is a pre-fault unit different from the residual unit, selecting a corresponding staff contact way from the staff contact way database for notification.
5. A frequency converter fault pre-diagnosis system is characterized in that: comprising 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 working units in the frequency converter one by one and acquiring the working state of the corresponding working unit;
The judging and notifying module (3) is used for determining a working unit which does not work normally after being electrified as a fault unit and notifying a worker;
Further comprises:
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;
a first marking module (5) for marking the working unit with residual current as residual unit;
The second detection module (6) is used for detecting the current residual condition of the residual unit for a plurality of times at the same time interval until the residual current disappears;
A recording module (7) for recording the residual current start detection time to the residual current disappearance time of the residual unit and recording the residual current start detection time as the residual detection time;
Further comprises:
the second marking module (8) is used for recording the working unit which does not work normally after the first time of power-on when the working unit is powered on, and recording the working unit as a pre-fault unit;
The judging module (9) is used for continuously powering on corresponding residual detection time to judge faults 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 work normally after the residual detection time passes; otherwise, when the pre-failure unit is different from the residual unit, the pre-failure unit is directly determined as the failure unit.
6. The frequency converter fault pre-diagnosis system according to claim 5, wherein: further comprises:
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 carrying out the fault judgment when no current remains in the pre-fault unit, otherwise, carrying out the fault judgment after corresponding residual detection time when the current remains in the pre-fault unit;
A database module (11) for presetting a worker contact information database (12) corresponding to the working unit and a residual worker contact information database (13) corresponding to the residual unit;
If the fault unit is the same pre-fault unit as the residual unit, the judging and notifying module (3) selects corresponding worker contact ways from the worker contact way database (12) and the residual worker contact way database (13) to notify;
And if the fault unit is a pre-fault unit different from the residual unit, the judging and notifying module (3) selects a corresponding worker contact way from the worker contact way database (12) to notify.
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