JPS63257468A - Inverter abnormality indication circuit - Google Patents

Abstract

PURPOSE:To subject the contents of abnormality to hysteresis treatment by incorporating said contents of abnormality in a writable, erasable and preservable storage means and by indicating them with an indicating means. CONSTITUTION:An inverter apparatus drives a load motor 4 from AC power via a converter circuit 2 and an inverter circuit 3. This abnormality indication circuit is composed of an over-voltage detection circuit 5, a base driving circuit 6, an overcurrent detection circuit 7, and a control circuit 101 by an arithmetic circuit 8 and others. Also, said indication circuit is equipped with a paging system 13 and a storage element 14, and said paging system 13 has display units 22, 23 of figures and the like with light-emitting elements to indicate arbitrary contents other than command operation frequencies by said light- emitting elements. Further, said storage element 14 preserves contents written in the arithmetic circuit 8 even after an inverter power has disappeared by the breaking of a switch 1A and reads out said contents after the recovery of power. Thus, it is made possible to determine the abnormalities of said inverter occurring in the past.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to a display circuit that indicates an abnormality when an inverter is abnormal.

[Conventional technology]

The 'Ps configuration of a conventional abnormality display circuit is shown in FIG. In the figure, (1) is the father's flow W source, (I person month j operation switch...
(2) is a converter that converts alternating current into blood flow (Cζ), (3) is an inverter circuit, (4) is a motor that is the load of the inverter, (5)
is overvoltage detection circuit, (6) is pace drive circuit, (7A month J market flow detector, (7) is overcurrent detection circuit, (8) is arithmetic circuit, (9) is operation command device, QG is overvoltage abnormality Is αυ the light emitting element that indicates the occurrence of an overcurrent abnormality?
be. The above (5) to circle are collectively shown as a control circuit Cl0L). 1 and 2 are power supplies for the control circuit.

The operation will be explained in 6'.

The blood flow in (1) is converted into blood flow by the converter (2), and after that, the driving command device fi! When the output frequency command is set by (9), the arithmetic circuit (3) calculates the inverter output frequency in order to smoothly follow the setting of this frequency command, and each switching element (
3) Generate on/off signals. This signal is sent to each sweeping element lζ of the inverter circuit (3) through the base drive circuit (6), and is turned on and off by the converter [reduced by the rectification Cζ of circuit (2): blood flow force]. A new alternating current is created and a load (4) fζ is supplied.

Next, the process by which the 1ζ anomaly is displayed will be explained.

For example, while an inverter is operating, the output current increases due to an increase in load. The output current is measured by a current detector (7
AJ detects when r'17g, and as mentioned above, when the output current exceeds a predetermined value 6ζ, the overvoltage detection circuit (7) operates. Upon receiving this signal, the arithmetic circuit (3) ignores the operation command and stops the output of each switching element of the inverter circuit (3) to prevent the switching element of the inverter circuit (3) from being destroyed. If this is prevented, the ζζ light emitting element α1) is turned on to indicate to the user that an overcurrent abnormality has occurred. l'i ¥1, inverter 44t
The converter circuit (
2) If the DC voltage between the inverter circuit (3) and the inverter circuit (3) exceeds a predetermined value, the overvoltage detection circuit (5) operates,
The arithmetic circuit (3) stops the ON and OFF signals of each switch and recessing element of the inverter circuit (3) to prevent element destruction and turns on the light emitting element GO which indicates the occurrence of an overvoltage abnormality P#E. I am trying to show this. First, the signal outputted from the arithmetic circuit (8) when the above abnormality occurs is connected to the operation switch (7A), and the switch (IA) is opened when an abnormality occurs, thereby converting the converter circuit (2).
~ Trying to prevent the inverter circuit (3) from becoming HIMf8. [Problems that the invention attempts to resolve] The conventional display circuit for indicating an abnormality is configured as described above, so that the inverter circuit (3) After turning off the city number and canceling the error, no record of the abnormality will be left.
It is not possible to know about abnormalities caused by pressure generation in the past.

As shown in Figure 5, when an abnormality occurs, the switch (
IA) In the case of a sequence that opens, the display disappears with the switch-off, so there is a problem in that it is impossible to know the cause of the abnormality.

The present invention is an all-in-one effort to eliminate the above-mentioned problems, and an object of the present invention is to provide an inverter abnormality display device that allows users to know about inverter abnormalities that have occurred in the past.

[First Means to Solve the Problem] The inverter abnormality display circuit according to the present invention stores the inverter abnormality, is writeable and erasable, and retains the stored contents even when the power to the inverter is cut off. The apparatus comprises a storage means, a storage means for displaying the contents stored in the storage means, and a means for displaying the contents stored in the storage means.

[Effect]

In the inverter abnormality display circuit according to the present invention, since the contents of the abnormality are stored in the storage means, the contents of the abnormality are stored in the storage means even after 1 time, and the contents of the abnormality are erased. If necessary, past abnormalities can be read out and displayed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. In FIG. 1, (1) to (81, a2 are the fifth
It is the same as the figure. (To) is a driving command device, and the driving command device f! of FIG. In addition to playing the same role as i (9), it is also a device for displaying numbers and letters using light emitting elements (
b) He also has a sword. Therefore, the city flA for the control circuit
From a2, any content other than the commanded operating frequency can be displayed using the light emitting element. Q41 is a memory element that can be electrically written and erased freely and has a storage capacity of 1[
A memory element that can store contents without the need for an EEP-1tUM (E-11 electrical
ly Eraseahlp kLend only
Memory). Therefore, the contents written by the arithmetic circuit (8) while the inverter is operating are saved even after the inverter's power is lost due to switching off of the switch (IA), and after the power is restored, the contents of the arithmetic circuit (8) are saved.
), the contents can be read out.

The operation will be explained. After the circuit operations in (1) to (3), the number of laps is set using the manual key of the operation command device 1lto3, and the circuit is passed through the arithmetic circuit (8) and the base drive circuit (6) to the inverter circuit (3). ) element on/off ζ
The process by which power is supplied to the inverter (4) is the same as in the conventional circuit, so a description thereof will be omitted. Here, a method will be described in which an abnormality occurs and its contents are stored in the storage element α4. As in the case of FIG. 5, the output writing pressure increases due to the increase in the number of factors. When the current exceeds a predetermined value, the overcurrent detection circuit (7) operates and transmits an abnormal output signal to the arithmetic circuit (8).The arithmetic circuit (8) determines the content of the abnormality from the transmitted γ signal. and instantaneously stores it in the memory element α4 as a symbol (generally a number).The memory element side can be cleverly written and erased, and the memory content can be retained even without power. The lζ subtraction circuit (
8) In the case Cζ where the contactor (IA) is opened at the same time as an abnormality occurs due to the output of the abnormality occurrence signal from the above, and the M control Wtlflμs disappears, the contents of the storage element u4 are the holding np. Therefore, after the power is turned on again, the contents of the memory element α4 can be displayed on the operation command device o3, and as a result, the previous abnormality can be known. By storing the contents of a plurality of abnormalities in the order in which they occur, it is possible to clearly know the order in which abnormalities that occur almost simultaneously occur, and the contents of abnormalities that are likely to occur can also be known. Since it can be erased electrically, it is possible to erase the contents manually by pressing the key of the operation command device a3, and the memory element α1ζ memorizes every abnormality that occurs in the order in which it occurs. In this case, it is possible to store multiple items and automatically erase and write them so that the number remains constant.

Next, the operation of the arithmetic circuit (8) from abnormality detection to abnormality writing in the event of an abnormality is shown in FIG. 2 using a program flowchart. The presence or absence of excessive violet pressure abnormality is determined at the first stage I (to). The presence or absence of an overcurrent abnormality is determined by the stay and valve αQ, and if there is at least 10,000, the stay and valve αη are
Outputs an abnormal signal. Next, the content of the abnormality is determined and symbolized at stage V. In step a9, the symbol determined in step (to) is recorded in the memory element. The above is
This is done instantly when an abnormality occurs.

FIG. 3 shows a flowchart for reading symbols indicating abnormality contents. First, the reading circle 'g of the symbol indicating the abnormal content is determined in the stage B. The stave I Q'D outputs the contents to a display device and displays them, for example, as shown in figure m4.

Note that FIG. 4 (&) shows an example of the display on the display device when overvoltage is detected during acceleration, and FIG. 4(b) shows an example of the display in the case of overvoltage. The above operations perform abnormal writing and reading.

In addition, in the above embodiment, the abnormal content is defined as the τ error.

Although only overcurrent is shown, abnormality contents other than those described above may be provided.

For example, there are instantaneous power outages that protect the inverter in the event of a momentary power outage, and thermal operations that protect the inverter load when the inverter load abnormally overheats due to a prolonged overload condition. Effects] As described above, according to the present invention, writing and erasing are possible.
W@I is configured to store the abnormality contents in a storage means that can save the memory contents when the power is cut off, and to display the stored contents on the display means as appropriate. The contents will not disappear and you can see the contents again after throwing the city vinegar. First, it is possible to keep a history of abnormalities and to know the tendency of abnormalities that are likely to occur.

[Brief explanation of drawings]

The first ('21) is an invar according to an embodiment of the present invention.
Figures 2 and 3 are flowcharts showing its operation, Figure 4 is a diagram showing an example of the display of the error display device, and the fifth cause is the error display circuit of a conventional inverter. FIG. In the figure, with gLN, (1) C AC? Jr#, (IA) is the operation switch, (2) is the converter circuit that converts alternating current to free current (RAK conversion '14), (3) is the inverter circuit,
(4) is a motor with an inverter load "r", (5) is an overcurrent detection circuit, (6) is a base drive ν circuit, (7A) is a four-accent detector, (7) is an overcurrent detection circuit, (8) ) is an arithmetic circuit,
(9) is a driving command device, αG is a light-emitting element that indicates overvoltage abnormality generation liF, αυ is a light-emitting element that indicates overcurrent abnormality, 电 is for control circuit type-10 is a driving command device, α・υ is a memory element,
The hood is an example of a display on the display device when an overcurrent is detected during acceleration, and ■ is an example of a display on the display device when an overvoltage occurs. Note that the same reference numerals in each figure indicate corresponding parts.

Claims (2)

[Claims] (1) In an inverter that converts AC power into DC using a rectifier circuit and creates new AC with variable voltage and variable frequency using switching elements, there is an abnormality detection circuit that detects an abnormality in the inverter, and the output of the detection circuit. An abnormality display circuit for an inverter, comprising a storage means that stores contents in the order of abnormality occurrence, can be freely read and written at any time, and retains the stored contents even when power to the inverter is cut off, and means for displaying the contents of the storage means. (2) As a storage means, an element EEP that is electrically writable and erasable and capable of preserving memory contents even without holding power
-Claim 1 characterized in that a ROM is used.
Inverter abnormality display circuit described in section.