JPH0265674A - Abnormality treatment for power converter - Google Patents

Abstract

PURPOSE:To make resetting of an apparatus unnecessary and to improve the operating properties thereof by prohibiting the indication of abnormality or the transmission of said abnormality to a host apparatus relative to a power failure occurring when an inverter is in the stopped state after the completion of its preparation. CONSTITUTION:When a failure occurs (b) in the voltage and current of an inverter, whether said inverter is in operation or not is judged (c). When the inverter is in operation, an ordinary abnormality treatment (d) is applied and various abnormalities are indicated (e) and reported (f) to a host apparatus. When the trouble is removed, said inverter is reset (g) and returned and the abnormality indication is eliminated. When the inverter is out of operation, the abnormality indication is automatically reset (i) and returned (j). Thus, said apparatus need not be reset each time so that its operating properties are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to abnormality handling in a power conversion device, which is suitable for abnormality handling that occurs in a power conversion device such as an inverter, particularly in a ready state.

[Conventional technology]

Conventional devices are also designed to handle abnormalities that occur when the inverter is in a ready state, as described in Japanese Patent Laid-Open No. 61-240860.

[5 Notifications to be Solved by the Invention] The above-mentioned prior art does not take into consideration the abnormality processing that occurs when the inverter device is in the ready state, and also displays the abnormality that occurs when the device is in the standby state. There is a problem in that the user cannot use the device unless he or she resets the malfunction when moving the device.

Since conventional devices latch abnormal signals for all abnormalities, abnormalities that occur in the standby state are retained forever unless a reset operation is performed or the power is turned off. For this reason, when an attempt is made to operate the inverter, if an abnormality has occurred before then, the inverter cannot be operated unless the abnormality latch signal is reset. In other words, if an abnormality occurs when the inverter is stopped, this is latched, so even if the abnormality disappears when the inverter starts operating, the inverter cannot be operated unless the latch signal is reset and released.

An object of the present invention is to improve operability for the user by configuring the device so that abnormalities such as fleas are not displayed when the device is in standby mode.

[Means to solve the problem]

The above object is achieved by prohibiting the display of abnormalities that occur only in the standby state of the device.

[Effect]

The microcomputer in the control circuit operates to constantly monitor abnormal signals from each detection circuit and whether or not the inverter device is ready.

As a result, the microcomputer automatically resets the inverter when an abnormality occurs when the device is in the ready state, so there is no need for the user to reset the inverter each time the inverter is driven.

[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 2, 1 is a forward converter, 2 is an inverse converter, 3 is a smoothing capacitor, and 4 is an AC machine.

5 is an R current detector 6 is a power supply abnormality detection circuit, 7 is an overvoltage detection circuit, 8.10 is an overvoltage detection circuit. 12 is a frequency command, 11 is a control circuit, and 9 is an inverter. This is a gate drive circuit that drives the main elements of the device.

Since the operation of the inverter is a well-known technique, a description thereof will be omitted.

FIG. 1 is a flowchart of a program for determining abnormality processing according to the present invention.

When an abnormality signal is output from each detection circuit, the process moves to an abnormality processing determination routine.

At this time, it is determined whether the inverter device is in operation or not, and if it is not in operation, it automatically sets 1 and clears all abnormality No. 13. If the engine is in operation, the normal routine including one abnormality process is executed.

As described above, according to this embodiment, the abnormal latch signal that occurs when the inverter device is not in operation can be automatically reset, so the user does not have to reset it each time when driving the 8i positioner. This has the effect of improving operability.

〔Effect of the invention〕

According to the present invention, it is possible to automatically reset the abnormal latch signal that occurs when the inverter device is not being driven, so the user does not need to reset it when driving the inverter device, thereby improving operability for the user. effective.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of an abnormality processing discrimination program, and FIG. 2 is a circuit configuration diagram of an embodiment of the present invention. 1: Forward-Ie converter, 2: Inverse converter, 3: Smoothing capacitor, 4: AC machine, 5: Current detector, 6: Power supply abnormality detection circuit, 7: Overvoltage detection circuit, 8: DC overcurrent detection Circuit, 9 drive circuit, 1o: AC overcurrent detection circuit, 11: control circuit, 12: frequency command unit ratio 1 concave

Claims (1)

[Claims] 1. A power conversion device that can convert to any voltage/frequency;
In a device comprising an alternating current machine driven by the output of the power converter, an abnormality is displayed or the abnormality is transmitted to a higher level in response to a power supply abnormality that occurs when the power converter is in a stopped state (ready state). A method for handling an abnormality in a power conversion device, characterized in that: 2. The abnormality processing method for a power conversion device according to claim 1, characterized in that displaying other abnormalities such as overcurrent or overvoltage or transmitting such abnormalities to a higher level is prohibited.