JP2014027838A - Inverter fault automatic switching system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter fault automatic switching system that monitors a fault of an inverter system, automatically switches, if there is a faulty inverter unit, from the faulty unit to a standby inverter unit, and thereby can start up the inverter system quickly.SOLUTION: An inverter fault automatic switching system is characterized by comprising: an inverter device comprising multiple kinds of inverter units to which set are setting values comprising constants and the like corresponding to the capacity of a motor to be driven; an implementation standby inverter device comprising multiple kinds of standby inverter units switchable with the inverter units; an inverter switching panel which holds the setting values per inverter unit, and, if it has detected a fault of any of the inverter units, sets the setting value of the faulty inverter unit to a corresponding standby inverter unit within the implementation standby inverter device; and a switching breaker which breaks connection with the motor controlled by the inverter device if any of the inverter units is faulty.

Description

  The present invention relates to an inverter failure automatic switching system.

  A drive device that operates an induction motor (motor) with an inverter device at a variable speed is widely used to drive various machines (loads) such as a fan or a pump at a variable speed. And in order to avoid the influence of the stop by failure etc., an inverter apparatus is duplexed, and when one side fails, it switches to the other inverter apparatus, and the stop of a load can be completed in a short time.

  For example, when switching to another inverter device at the time of failure of the inverter device, the frequency and phase of the terminal voltage of the motor are always detected and set to the switching inverter at the time of failure (see, for example, Patent Document 1).

  In addition, in a plurality of inverter systems that are operated in parallel, it has been proposed to detect inverter failures and switch systems (see, for example, Patent Document 2).

  In the inverter device with multiple types of motor control, if even one inverter unit fails, the inverter device is temporarily stopped, the failed inverter unit is manually removed, and a spare inverter unit is mounted at the relevant location and driven. It is necessary to set a predetermined set value (parameter) including a constant according to the capacity of the motor to be operated.

  If a failure occurs, shut off the main circuit, check the safety, remove the failed inverter unit, set the preset value for the spare inverter unit, and confirm the switch to the spare inverter unit. After that, the system is restarted.

JP 2008-5624 A JP-A-8-289475

  Even when a failure occurs in a unit, for example, there is a request to restore the production line early, but it is unpredictable when the failure itself occurs.

  For this reason, it may take time to replace the inverter unit in some cases, stop the equipment for a long time, or a setting error may occur due to unfamiliar work, or it may lead to failure of the motor or mechanical equipment due to incorrect setting. there were. When replacing a failed inverter unit in the inverter system, there is a problem that the inverter system must be stopped and replaced with a spare inverter unit.

  Therefore, the present invention has been made to solve the above-described problems, and its purpose is to monitor the failure of the inverter system and automatically switch to the spare inverter unit side if there is a failed inverter unit. An object of the present invention is to provide an inverter fault automatic switching system that can start up equipment early.

  According to one aspect of the present invention, an inverter device including a plurality of types of inverter units in which set values including constants according to the capacity of a motor to be driven are set, and a plurality of types of spare units that are switchable with the inverter units. A mounting spare inverter device including an inverter unit, and the setting value is held for each inverter unit, and when any failure of the inverter unit is detected, the setting value of the failed inverter unit is set to the mounting spare An inverter switching board set in the corresponding spare inverter unit in the inverter device, and a switching circuit breaker for cutting off the connection with the motor controlled by the inverter device when any of the inverter units fails. An inverter fault automatic switching system is provided.

  According to the present invention, since a series of replacements are executed without delay by automatically switching the failed inverter unit to the spare inverter unit, the equipment can be started up early.

It is a block diagram which shows the structure of the inverter failure automatic switching system which concerns on one Embodiment of this invention. It is a flowchart explaining the flow of control processing.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  In the inverter failure automatic switching system according to the present embodiment, the inverter device detects that the inverter unit being used has failed and automatically switches to the inverter unit for mounting. Further, by automatically setting the set value of the failed inverter unit, manual replacement is unnecessary and the replacement time can be shortened.

  FIG. 1 is a diagram showing a configuration of an inverter failure automatic switching system according to an embodiment of the present invention.

  As shown in FIG. 1, the inverter failure automatic switching system 10 is mainly composed of an inverter device 1, an inverter switching board 2, a mounting spare inverter device 3, a switching breaker 4, and a motor M to be controlled. .

  The inverter device 1 controls a plurality of motors, and in addition to a converter (not shown) for converting a DC voltage, inverter units 5a, 5b, 5c,. It is equipped with. Each of the inverter units 5a, 5b, 5c,.

  The mounting spare inverter device 3 functions as a spare device for the inverter device 1. The mounting spare inverter device 3 includes a plurality of inverter units 6a, 6b, 6c,... Having the same configuration as that of the inverter device 1. The inverter unit 6a exhibits the function of an alternative unit by setting the same set value as the inverter unit 5a. Similarly, the inverter unit 6b exhibits the function of an alternative unit by setting the same set value as that of the inverter unit 5b.

  The inverter switching board 2 determines whether or not the inverter units 5a, 5b, 5c,... In the inverter device 1 have a failure, and in the case of failure, the inverter units 6a, 6b, 6c,. ..Controls switching between and. The inverter switching board 2 is composed of, for example, a PLC (programmable logic controller), and holds the set values of the inverter units 5a, 5b, 5c,. As the nonvolatile memory, for example, an electrically erasable / rewritable EEPROM is suitable. The processing program self-diagnose which of the inverter units stacked in multiple stages is faulty. Details of the switching control will be described later.

  When switching to the inverter units 6 a, 6 b, 6 c... In the mounting spare inverter device 3, the switching breaker 4 cuts off the connection with the motor M to be controlled for ensuring safety.

  Next, the control process of the inverter failure automatic switching system configured as described above will be described. FIG. 2 is a flowchart for explaining the flow of the control process.

  First, it is determined whether or not the inverter device 1 is abnormal (step S21).

  If the inverter device 1 is abnormal (Yes in step S21), the faulty inverter unit 5a is disconnected from the electric motor (step S22). As a failure factor of the inverter unit 5a, for example, overcurrent, rotation failure of the built-in fan, fuse blown, etc. are expected.

  Furthermore, an alarm signal is output (step S23). Generally, the operation status of the system is monitored by an operator via an operation panel. Therefore, an alarm signal is output to the operation panel, and for example, a graphic panel provided on the operation panel is used to notify the occurrence of a failure of the inverter unit.

  If the inverter device 1 is not abnormal (No in step S21), step S21 is repeated.

  Next, the set value of the faulty inverter unit 5a is set to the inverter unit 6a in the mounting spare inverter device 3 (step S24). The set value to be set is held in a nonvolatile memory provided in the inverter switching board 2.

  Next, it is determined whether or not the set value has been set normally (step S25). The reason for providing this step is, for example, to check whether there is any trouble due to disconnection or the like in the system. In addition, since setting of the set value takes some time, there is an aim of securing the set time.

  If the set value can be set normally, the connection is switched to the spare inverter unit 6a (step S26).

  Next, confirmation of automatic or manual selection is executed (step S27). Since the system is temporarily stopped, the operator may need to confirm it when restarting. Therefore, automatic or manual selection is confirmed by the status of, for example, a push button provided on the operation panel.

  Next, it is determined whether or not “automatic” has been selected (step S28). If “automatic” is selected (Yes in step S28), the inverter fault automatic switching system is restarted (step S29).

  If "automatic" is not selected (No in step S28), after confirming the "manual" operation by the operator, the inverter failure automatic switching system is restarted (step S30).

  According to this embodiment, since a series of replacement work is not performed manually by automatically switching the failed control device (unit) to the spare inverter unit (unit) side, the equipment can be started up early. .

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Inverter apparatus 2 ... Inverter switching board 3 ... Preliminary mounting inverter apparatus 4 ... Switching circuit breaker 5a, 5b, 5c ... Inverter unit 6a, 6b, 6c ... Inverter unit

Claims (8)

An inverter device including a plurality of types of inverter units in which set values including constants corresponding to the capacity of the motor to be driven are set;
A mounting spare inverter device comprising a plurality of types of spare inverter units switchable with the inverter unit;
The set value is held for each inverter unit, and when any failure of the inverter unit is detected, the set value of the failed inverter unit is stored in the corresponding spare inverter unit in the mounted spare inverter device. An inverter switching board to be set;
If any of the inverter units is faulty, a switching breaker that disconnects the connection with the motor controlled by the inverter device,
An inverter fault automatic switching system comprising:   2. The inverter fault automatic switching system according to claim 1, wherein the set value is held in a nonvolatile memory provided in the inverter switching board.   3. The inverter fault automatic switching system according to claim 2, wherein the nonvolatile memory is an EEPROM (Electrically Erasable Programmable Read-Only Memory).   The inverter switching automatic switching system according to any one of claims 1 to 3, wherein the inverter switching board outputs an alarm signal when a failure of the inverter unit is detected.   The inverter fault automatic switching system according to any one of claims 1 to 4, wherein, after switching to the spare inverter unit, it is possible to select whether to automatically restart or restart through an operator's manual operation. .   The inverter inverter automatic switching system according to any one of claims 1 to 5, wherein the inverter device includes a converter.   The inverter inverter automatic switching system according to any one of claims 1 to 6, wherein the inverter device includes the inverter units in a multi-stage stack.   The inverter failure automatic switching system according to any one of claims 1 to 7, wherein the inverter switching board is configured by a PLC (programmable logic controller).

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