JP2012225349A - Rotary machine device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary machine device which continues operation without trouble for a demanding user even if a trouble occurs on an inverter control board.SOLUTION: A water supply device 1 as a rotary machine device includes a plurality of pumps 3, a plurality of inverters 5 which variably control a rotation frequency of a corresponding pump and a controller 6 controlling the plurality of inverters 5. The controller 6 includes a plurality of control boards 60a and 60b, each of which independently controls the plurality of inverters 5, and if a trouble occurs on either the control board 60a or the control board 60b during operation, the other standby control board 60b or control board 60a backups to control the plurality of inverters 5.

Description

  The present invention relates to a rotary machine device such as a water supply device, and more particularly to a rotary machine device such as a water supply device that supplies water to an apartment house by inverter-controlling a pump.

  For example, in a rotary machine device such as a water supply device, it is widely performed to operate a pump at a variable speed by using an inverter that converts the frequency and voltage of a commercial AC power source into an arbitrary frequency and voltage. Because the inverter can change the rotation speed of the motor that drives the pump arbitrarily, it can be operated at the optimum rotation speed corresponding to the load of the pump, saving energy compared to operating at the rated speed. be able to.

  In such a water supply apparatus, a plurality of pumps may be controlled using a plurality of inverters. In this case, a control unit for controlling these pumps and inverters is provided. In such a water supply device using a plurality of pumps and inverters, when a certain pump fails (leakage, overcurrent, phase loss, etc.), it is possible to automatically switch to another pump to avoid water breakage. it can.

  However, if the control unit (control board) that controls the pump and the inverter does not operate normally due to some trouble, all the pumps become inoperable, and the water shutoff state remains until the failed control board is replaced. It will continue.

  From such a viewpoint, all pumps are divided into several groups every several units, and one control board is provided for several pumps, and control is performed by a plurality of control boards. According to this method, even if one control board breaks down, it becomes possible to continue water supply by another control board. However, in this method, since control boards other than the failed control board do not have sufficient input terminals and cannot control all pumps, there is a problem that the amount of water that can be supplied is reduced. Therefore, in this case as well, there is a possibility that the user at the demand destination may be inconvenient until the failed control board is replaced.

  The present invention has been made in view of such problems of the prior art, and even if an abnormality occurs in the board that controls the inverter, the operation is continued without causing a problem to the user of the customer. An object of the present invention is to provide a rotating machine device such as a water supply device.

  In order to achieve the above object, one aspect of the present invention includes a plurality of rotating machines, a plurality of inverters that variably control the rotation frequency of the corresponding rotating machines, and a control unit that controls the plurality of inverters, The control unit includes a plurality of control boards each capable of independently controlling the plurality of inverters, and when an abnormality occurs in one of the plurality of control boards during operation, The control board backs up the one control board to control the plurality of inverters. The plurality of control boards may have the same configuration. Alternatively, the plurality of control boards may include at least one control board for backup operation having a minimum configuration necessary for controlling the plurality of inverters.

  One reference example of the present invention provides a water supply apparatus including a plurality of pumps, a plurality of inverters that variably control the rotation frequency of the corresponding pumps, and a control unit that controls the plurality of inverters. The control unit includes a plurality of control boards each capable of independently controlling the plurality of inverters. In this case, when an abnormality occurs in one control board during operation, it is preferable that another standby control board backs up the one control board to control the plurality of inverters.

  With such a configuration, even if an abnormality occurs in one control board, it is possible to continue operation with the maximum amount of water in the water supply device by backing up with another control board that is on standby, and avoid water breakage. Can do.

  As described above, according to the present invention, even if an abnormality occurs in the board that controls the inverter, the operation can be continued without causing a problem to the user at the demand destination.

It is the schematic which shows the water supply apparatus in the 1st Embodiment of this invention. It is the schematic which shows the inverter of FIG. It is the schematic which shows the control part of FIG. FIG. 4 is a block diagram illustrating a relationship between the control board of FIG. 3 and the inverter of FIG. 1. It is the schematic which shows the other example of the control board of FIG. It is the schematic which shows the water supply apparatus in the 2nd Embodiment of this invention.

  Hereinafter, an embodiment of a water supply device as a rotating machine device according to the present invention will be described in detail with reference to FIGS. 1 to 6. 1 to 6, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic view showing a water supply apparatus 1 according to the first embodiment of the present invention. As shown in FIG. 1, the water supply device 1 includes two water receiving tanks 2, two pumps 3 connected to each water receiving tank 2 through a pipe 10, a motor 4 that drives the pump 3, An inverter 5 that controls the rotation frequency and a control unit 6 that controls various devices including the inverter 5 are provided.

  Each water receiving tank 2 is provided with a water level detector 12 for detecting the water level of the water receiving tank 2 by the electrode rod 12a. The water level detector 12 in the present embodiment detects four liquid level levels (full water, reduced water, return, drought). Tap water is introduced into each water receiving tank 2 through a solenoid valve 16 from a water supply pipe 14 connected to a water main (not shown). The water level detector 12 detects the water level of the water receiving tank 2, and the control unit 6 opens and closes the electromagnetic valve 16 according to the increase or decrease of the water level. With such a configuration, the tap water is once stored in the water receiving tank 2, and the stored water is supplied by the pump 3 to a terminal demand destination such as a house.

  A pipe 18 and a discharge pipe 20 are connected to the discharge side of each pump 3, and the tap water in the water receiving tank 2 is supplied by the pump 3 to a terminal demand destination such as a house. The pipe 18 is provided with a check valve 22 and a flow switch 24, and the output of the flow switch 24 is input to each inverter 5. The check valve 22 is a backflow prevention valve for preventing water from flowing back from the discharge side to the suction side when the pump 3 is stopped, and the flow switch 24 indicates that the amount of water in the pipe 18 has decreased. It is for detection.

  A pressure sensor 26 that detects the discharge pressure of the pump 3 is installed in the discharge pipe 20, and an output signal of the pressure sensor 26 is input to the control unit 6. In addition, a pressure tank 28 is connected to the discharge pipe 20, and when the flow switch 24 detects that the amount of water has decreased, the pressure tank 28 accumulates pressure in order to prevent the pump 3 from shutting down. Then, the operation of the pump 3 can be stopped.

  In this water supply apparatus 1, the rotational speed (rotational frequency) of the pump 3 is variable-speed controlled using the inverter 5 based on output signals from the flow switch 24 and the pressure sensor 26. Generally, the discharge pressure is constant so as to control the rotation speed of the pump 3 so that the pressure signal detected by the pressure sensor 26 matches the set target pressure so that the discharge pressure of the pump 3 becomes constant. Control or estimated terminal pressure constant control for controlling the supply water pressure at the end demand destination to be constant by appropriately changing the target value of the discharge pressure of the pump 3 is performed. According to these controls, the pump 3 is driven at a rotational speed commensurate with the amount of water demand at that time, so energy saving can be achieved.

  When the flow switch 24 is turned on, it is determined that the water is not used and the amount of water is small, and the operation of the pump 3 is stopped. When the use of water is detected due to a decrease in discharge pressure or the like, the pump is restarted. When the pump 3 is stopped when the amount of water is small, the pressure accumulation operation may be performed in which the pump 3 is once accelerated and accumulated in the pressure tank 28 and then the pump 3 is stopped.

  Since the water supply apparatus 1 of this embodiment is provided with a plurality of pumps, when a plurality of units are operated with additional disconnection or when an abnormality of a specific pump 3 or inverter 5 is detected during operation, the other It is possible to continue the water supply by switching the operation to normal pump 3 or inverter 5.

  FIG. 2 is a schematic diagram showing the inverter 5 of FIG. As shown in FIG. 2, the inverter 5 includes a main board 50, an operation panel 52 for setting the inverter 5 (for example, setting acceleration time, deceleration time, etc.), and an I / O board for inputting and outputting various signals. (Input / output substrate) 54.

  The main board 50 includes a rectifier 500 that rectifies AC power input via an earth leakage circuit breaker (Earth Leakage Circuit Breaker: ELB) 56, and switching that converts the power rectified by the rectifier 500 into AC power having a desired frequency. An element (power unit) 501, a communication unit (serial port) 502 that exchanges information with the control unit 6 and other inverters 5 via the serial communication cable 30, and a memory (ROM or rewritable memory) that stores various programs 503, and a CPU 504 that performs an arithmetic control operation based on a program stored in the memory 503.

  The main board 50 converts the electric power input via the leakage breaker 56 into DC power by the rectifier 500 and drives a switching element 501 such as an IGBT (Insulated Gate Bipolar Transistor) to control AC power (control) at a desired frequency. The power is supplied to the motor 4 that drives the pump 3 by converting the power into a frequency corresponding to information sent from the unit 6 via the communication unit 502.

  The memory 503 has a program for controlling the switching element 501, exchanging information via the communication unit 502, and exchanging information with the I / O board 54 and the operation panel 52, and various inverter control and operation control programs. Is remembered. These programs are executed by the CPU 504. Note that the memory 503 and the CPU 504 may be mounted on the same semiconductor chip. Since the memory 503 and the CPU 504 are driven by DC power, the main board 50 of the inverter 5 is provided with a power supply unit 505 that supplies DC power to the main board 50. The power supply unit 505 includes a transformer, a rectifier, a capacitor, and the like. The power supply unit 505 supplies power to the operation panel 52 and the I / O board 54.

  The I / O board 54 includes various input terminals and output terminals that can be freely modified according to the usage application of the inverter 5. In the I / O board 54 shown in FIG. 2, an analog input terminal 540 that receives a signal from a thermistor that is provided in each pump 3 and detects the temperature of the pump 3, and a leakage breaker that is provided on the primary side of the inverter 5. The digital input terminal 541 to which the trip signal of the device 56 and the ON / OFF signal of the flow switch 24 provided on the discharge side of the pump 3 are input, and whether the pump 3 is in operation (pump start / stop) There is provided a digital output terminal 542 for outputting an operation signal which is an ON / OFF signal and a failure signal notifying the failure of the pump 3 or the inverter 5 to the outside of the apparatus.

  Further, the I / O board 54 is provided with a dip switch 543, and this dip switch 543 is used for setting an inverter number (pump number) in a water supply apparatus having a plurality of inverters.

  As described above, the I / O board 54 includes input terminals for signals (input signals depending on the pump) required for each pump series, such as the thermistor, the earth leakage breaker 56, the flow switch 24, and the like. Similarly, an output terminal for a signal (an output signal depending on the pump) required for each pump series, such as operation and failure, is also provided. Therefore, it is not necessary to provide these input / output terminals in the control unit 6 as in the prior art, and even when the number of pumps increases, it is not necessary to prepare a separate substrate for inputting / outputting these signals.

  The I / O board 54 and the main board 50 are connected to each other through interfaces 544 and 506. Signals input from the input terminals 540 and 541 of the I / O board 54 are transmitted from the communication unit 502 to the control unit 6 in accordance with a program stored in the memory 503 of the main board 50. Further, a failure signal is output to the outside from the output terminal 542 via the interfaces 506 and 544 based on the determination of the control unit 6 and the CPU 504 of the main board 50.

  As shown in FIG. 2, the operation panel 52 includes an operation changeover switch (operation unit) 520 for selecting test / stop / automatic operation of the pump 3 driven by the inverter 5, a lamp 521 indicating operation / failure, an inverter The minimum number of operation buttons (operation units) 522 necessary for setting 5 is provided. Unlike the operation panel of the conventional inverter, the operation panel 52 does not include a display unit including a liquid crystal display for displaying information related to the inverter 5 or a 7-segment display.

  The operation panel 52 is connected to the I / O board 54 via the interfaces 523 and 545. The operation state of the pump 3 can be switched by switching the operation changeover switch 520, and the operation button 522 is operated to set the inverter 5 (for example, the setting of acceleration time, deceleration time, etc.) and the contents displayed on the display unit. Can be changed (switched). In the present embodiment, the operation panel 52 is formed separately from the main board 50 and connected to the I / O board 54 via the interfaces 523 and 545. It may be formed integrally with the O substrate 54.

  When the operation changeover switch 520 of the operation panel 52 is set to “automatic”, the pump 3 is controlled at a variable speed in accordance with a command from the control unit 6. When the operation changeover switch 520 is set to “stop”, the inverter 5 stops the driving of the pump 3 regardless of the command of the control unit 6. Further, when the operation changeover switch 520 is set to “test”, the inverter 5, the motor 4, and the pump 3 can be manually tested (trial operation). In the water supply apparatus 1, the test operation of the corresponding pump 3 is performed when the apparatus is installed or when the pump 3 or the motor 4 is maintained. In this test operation, it is checked whether or not the device is moving or whether or not the direction of rotation of the pump is correct.

  Since such an operation changeover switch 520 is provided in each inverter 5, when it is desired to forcibly stop or operate an arbitrary pump, the purpose can be easily achieved. When the operation changeover switch 520 is switched to “stop” or “test”, the inverter 5 notifies the control unit 6 that the operation has been switched to the stop state or the test state, and the control unit 6 performs control in consideration of this. It can be performed.

  FIG. 3 is a schematic diagram showing the control unit 6 of FIG. As shown in FIG. 3, the control unit 6 includes two control boards 60a and 60b for inputting and outputting signals and controlling the apparatus, and an operation panel 62 for performing various settings. Since the control boards 60a and 60b have the same configuration, only the control board 60a will be described here.

  The control board 60a includes a communication unit (serial port) 600 connected to the communication unit 502 of the inverter 5, a memory (ROM or a flash memory that is a rewritable nonvolatile storage element) 601 storing various programs, And a CPU 602 that performs an arithmetic control operation based on a program stored in the memory 601. Information such as the start / stop of the pump 3, the rotation frequency, the trip of the inverter 5, etc. is exchanged via the communication unit 600. Note that the memory 601 and the CPU 602 may be mounted on the same semiconductor chip.

  The control board 60a includes an input terminal 603 to which a signal related to the liquid level of the water receiving tank 2 (an output signal of the water level detector 12) and the like are input, an input terminal 604 to which an output signal from the pressure sensor 26 is input, An output terminal 605 for outputting an output signal to the electromagnetic valve 16 and an output terminal 606 for outputting the state of the water receiving tank 2 (full / low water / drought / failure, etc.) to the outside are provided. As described above, an input signal independent of the pump is input to the input terminals 603 and 604, and an output signal independent of the pump is output from the output terminals 605 and 606. The control board 60a includes a dip switch 607.

  In this way, the control board 60a is provided with input / output terminals (input / output terminals independent of the pump) that do not need to be provided for each pump, such as a signal related to the liquid level of the water receiving tank 2, discharge pressure, and inflow pressure. However, as described above, the input / output terminals necessary for each pump series (input / output terminals depending on the pump) are provided on the I / O board 54 of the inverter 5, so that the input / output terminals are connected to the control board 60 a. Can be reduced and the size can be reduced. Along with this, cost reduction can be expected.

  The control board 60a executes the control program stored in the memory 601, and determines the start / stop (number of operating units) and operating frequency of each pump 3 based on the conditions set on the operation panel 62 and signals from various sensors. The frequency is determined and transmitted to the inverter 5 to control the rotation frequency of the pump 3. In addition, the control board 60 a performs control such as stopping the operation of the pump 3 or switching the operation to another pump 3 based on signals from various sensors and a trip signal from the inverter 5.

  Here, when the apparatus is installed and when the pump 3 and the motor 4 are maintained, a test operation (trial operation) of the pump 3 is performed. This test operation is performed by manually switching the operation changeover switch 520 of the operation panel 52 of the inverter 5 to “test”. The rotation frequency of the motor 4 during the test operation can be changed to an arbitrary rotation frequency by an operation button (up / down button) 522 of the operation panel 52. However, when a test operation is performed at a high frequency, the pressure in the secondary side pipe of the water supply device 1 greatly increases when water is not used, and problems such as leakage from the pipe joint occur. .

  In order to avoid such a problem, the maximum operating frequency of the inverter 5 is controlled to be lower during normal operation than during normal operation. Specifically, in the setting of the inverter 5, the maximum operation frequency itself during the test operation can be set, or the maximum operation frequency during the test operation can be set as a ratio to the maximum operation frequency during the normal operation. Thereby, it can prevent that the pressure in piping of the secondary side of the water supply apparatus 1 rises excessively.

  Each inverter 5 can freely perform a test operation. That is, any other pump can be test-operated while the other pump is in automatic operation. In this case, since the pressure pressurized by the pump during the test operation is detected by the pressure sensor 26, normal pressure control is performed unless the rotation speed (rotation frequency) of the pump during the test operation is very high. It only has to be. However, when the rotational speed is manually increased beyond such rotational speed, the discharge pressure becomes equal to or higher than the target pressure even when other pumps are stopped. Therefore, the control board 60a controls the rotation speed so as not to increase any more when the discharge pressure increases to a target pressure or higher, or reduces the rotation speed for the inverter 5 in the test operation state. Can be controlled. That is, the pump 3 can be tested safely and easily by automatically limiting the operating frequency of the pump 3 so that the discharge pressure does not rise above a certain level during the test operation of the pump 3. It becomes like this.

  Note that the memory 601 and the CPU 602 of the control boards 60a and 60b are driven by receiving DC power from the power supply unit 505 of the main board 50 of the inverter 5 via the power supply terminal 507 (see FIG. 2). . In this way, by supplying power for the control boards 60a and 60b of the control unit 6 from the inverter 5, it is not necessary to separately provide a DC power source for the control boards 60a and 60b. Therefore, the manufacturing cost of the water supply apparatus can be reduced, and the sizes of the control boards 60a and 60b can be reduced. Although development of a stable power supply takes a considerable amount of time and expense, according to the present embodiment, it is only necessary to develop a power supply unit mounted on the inverter, so that the cost of the apparatus can be reduced.

  Instead of supplying power from both power supply terminals 507 of all inverters 5 to both control boards 60a and 60b, an inverter group that supplies power to the control board 60a and an inverter group that supplies power to the control board 60b are used. It may be divided. In this case, it is not necessary to increase the capacity of the power supply unit 505 of the inverter 5 as compared with the case where there is one control board.

  As shown in FIG. 3, the operation panel 62 of the control unit 6 displays a lamp 620 that indicates the state of the device, an operation button 622 that sets operating conditions such as a target pressure of the water supply device 1, and information related to the device. Display unit 624 including a liquid crystal display, a 7-segment display, and the like. An operation button 622 is used to select an operation mode and set operation conditions. The display unit 624 displays parameters of the apparatus being operated.

  As described above, the operation panel 52 of each inverter 5 is not provided with a display unit unlike the operation panel of the conventional inverter. Information on the inverter 5 such as current and operating frequency is displayed on a display unit 624 provided on the operation panel 62 of the control unit 6. That is, when the operation button 522 of the operation panel 52 of the inverter 5 is pressed, information regarding the inverter 5 is displayed on the display unit 624 on the operation panel 62 of the control unit 6. In this case, the display unit 624 may be switched by pressing any one of the operation buttons 522, or a display switching button may be provided in the operation button 522.

  Thus, according to this embodiment, since it is not necessary to provide a display unit such as a liquid crystal in the inverter 5, the cost of the apparatus can be reduced. In addition, since the display unit is provided in the control unit 6 in an integrated manner, the operator can easily understand the display contents, and the operability can be improved.

  On the other hand, since the minimum necessary operation buttons 522 remain on the operation panel 52 of the inverter 5, the display can be switched by an operation on the operation panel 52 of the inverter 5. Therefore, the display switching operation is simplified as compared with the case where the display is switched by the operation on the operation panel 62 of the control unit 6, and the operation panel 62 of the control unit 6 is also provided when the pump 3 and the inverter 5 are increased or decreased. There is no need to change the structure of the display unit 624. In addition, when the operation for display may be somewhat complicated, it is good also as displaying the information of each inverter 5 by switching a display by operation in the operation panel 62 of the control part 6. FIG.

  In addition to the function of displaying information related to the inverter 5 described above, the operation panel 62 of the control unit 6 selectively displays discharge pressure, inflow pressure, and the like during operation of the water supply apparatus 1 by operating the operation button 622. It has a function that can. Further, the operation condition such as the target pressure of the water supply apparatus 1 can be set by operating the operation button 622. The operation panel 62 is provided with an alarm buzzer, and the alarm content is displayed on the display unit 624 when an alarm is issued.

  FIG. 4 is a block diagram showing the relationship between the control boards 60a and 60b in FIG. 3 and the inverter 5 in FIG. As described above, the control boards 60a and 60b have the same configuration, and are connected to each other by serial communication and monitored for communication with each other. Each control board can control all the inverters 5 independently. Therefore, even if an abnormality (CPU error / communication abnormality / system abnormality, etc.) occurs in one control board 60a or 60b, it is possible to maximize the water supply device by backing up with the other control board 60b or 60a in standby. The operation can be continued with the amount of water, and water interruption can be avoided. At this time, an abnormality occurrence signal is output to the outside via the output terminal 606.

  Further, as described above, since the signal input terminal required for each pump series and the output terminal for signals required for each pump series such as operation and failure are provided in the inverter 5, Even if the control boards 60a and 60b have the ability to operate all the pumps, the size of the control boards 60a and 60b can be minimized regardless of the number of pumps 3.

  Here, which of the control boards 60a and 60b is used with priority can be arbitrarily set, and can be switched as necessary. For example, when it is necessary to update the drive program of the apparatus, a new program is introduced into the memory 601 of the control board 60a or 60b that is on standby, and then the control board to be used is switched to the control board 60a or 60b. The control board 60b or 60a that has been used up to now can be put in a standby state, and the program of the control board 60b or 60a can be rewritten. As a result, the program can be rewritten to a new one without stopping the operation of the water supply apparatus 1.

  In the example described above, an example in which the control board 60a and the control board 60b have the same configuration has been described. However, the control board 60a and the control board 60b may have a minimum configuration necessary for controlling the inverter 5. For example, it is not always necessary to have the same configuration. For example, as shown in FIG. 5, the control board 60b may be used as a board for backup operation, and the function may be simplified so as to have a minimum configuration necessary for controlling the inverter 5 (pump). By doing in this way, the cost of the whole apparatus can be reduced.

  When the control board 60b for backup operation is operated due to a malfunction of the main control board 60a, an alarm and notification that the main control board 60a has failed is made. As a result, the operator goes to the site for maintenance for maintenance. As described above, since the operator is performing on-site during the operation of the control board 60b for backup operation, it is not always necessary to notify the outside even if there is a problem with the control board 60b for backup operation. Therefore, in the control board 60b for backup operation shown in FIG. 5, the output terminal 606 for external notification of failure and alarm is omitted from the input terminals 603 in the control board 60a shown in FIG. Further, among the input terminals 603, input of full water, water reduction, and return is not necessarily required for pump control, so these terminals are omitted to simplify the input terminal 603.

  As described above, even if the backup operation control board 60b has a simplified configuration of the main control board 60a, it is necessary to repair the main control board 60a as long as it has a minimum configuration necessary for controlling the pump. If it is between, it is possible to sufficiently control the pump. Thereby, the cost of the whole apparatus can be reduced. Although it is conceivable that the failure of the main control board 60a itself cannot be output from the output terminal 606 (see FIG. 3) of the main control board 60a, the main control is performed by the failure signal from the output terminal 542 (see FIG. 2) of the inverter 5. It is also possible to notify the outside of the failure of the substrate 60a.

  FIG. 6 is a schematic diagram showing a water supply apparatus 101 according to the second embodiment of the present invention. A water supply apparatus 101 shown in FIG. 6 is a direct connection type water supply apparatus that directly connects the pump 3 to the water main pipe 102 and supplies water using the pressure of the water main pipe 102. In this water supply apparatus 101, a suction side pressure sensor 103 for detecting the water pressure of the water main pipe 102 is provided in the suction pipe 104, and this output is input to the control unit 6. The suction pipe 104 is provided with a backflow prevention device 105.

  In embodiment mentioned above, although the example which applied the inverter 5 to the water supply apparatus 1 was demonstrated, it is not restricted to this. The inverter 5 can be applied to various devices other than the water supply device simply by changing the operation panel 52 and the I / O board 54 of the inverter 5 to appropriate ones and rewriting the program in the memory 503. Therefore, the present invention can be applied to various devices without changing the hardware configuration of the main board 50 of the inverter 5, and thus the cost of the device can be reduced.

  A device for controlling the frequency of the power source for driving the DC brushless motor is often called a driver. However, the driver is also an induction motor in that the AC power source is rectified to obtain a desired frequency power by a switching element. It is the same as the inverter for driving. Therefore, you may drive a DC brushless motor using the inverter of the structure mentioned above. When a DC brushless motor is used, a motor rotation signal or current signal may be input to the I / O board 54 of the inverter 5.

  Needless to say, the number of the water receiving tank 2, the pump 3, the motor 4, the inverter 5, the control unit 6, the control boards 60 a and 60 b is not limited to the illustrated one. Further, communication between the communication unit 502 of the inverter 5 and the communication unit 600 of the control boards 60a and 60b can be performed not only by serial communication but also wirelessly. Moreover, although the water supply apparatus was demonstrated to the example in the above-mentioned embodiment, this invention is not limited to a water supply apparatus. For example, the present invention can be applied to an inverter used in a rotary machine device such as a fan or a compressor that requires rotational speed control. In other words, the present invention can be applied to various devices using a fan or a compressor by changing the pressure sensor to a device that detects the load of the device such as a temperature sensor by using the pump as a fan or a compressor.

  Although one embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1,101 Water supply apparatus 2 Water receiving tank 3 Pump 4 Motor 5 Inverter 6 Control part 10 Piping 12 Water level detector 14 Water supply pipe 16 Solenoid valve 18 Piping 20 Discharge pipe 22 Check valve 24 Flow switch 26, 103 Pressure sensor 28 Pressure tank 30 Serial Communication cable 50 Main board 52, 62 Operation panel 54 I / O board (input / output board)
56 Earth leakage breaker 60a, 60b Control board 102 Water main pipe 104 Suction pipe 105 Backflow prevention device 500 Rectifier 501 Switching element (power section)
502,600 Communication unit 503,601 Memory 504,602 CPU
505 Power supply unit 506, 523, 544, 545 Interface 507 Power supply terminal 520 Operation switch 521, 620 Lamp 522, 622 Operation button 540, 541, 603, 604 Input terminal 542, 605, 606 Output terminal 543, 607 Dip switch 624 Display section

Claims (4)

A plurality of rotating machines;
A plurality of inverters that variably control the rotation frequency of the corresponding rotating machine;
A control unit for controlling the plurality of inverters,
The control unit includes a plurality of control boards each capable of independently controlling the plurality of inverters,
When an abnormality occurs in one control board among the plurality of control boards during operation, another control board in standby mode backs up the one control board and controls the plurality of inverters. Rotating machinery equipment.   The rotary machine device according to claim 1, wherein the plurality of control boards have the same configuration.   The rotating machine apparatus according to claim 1, wherein the plurality of control boards include at least one control board for backup operation having a minimum configuration necessary for controlling the plurality of inverters. A plurality of rotating machines;
A plurality of inverters that variably control the rotation frequency of the corresponding rotating machine;
A control unit for controlling the plurality of inverters,
The control unit includes a plurality of control boards each capable of independently controlling the plurality of inverters,
The plurality of control boards include at least one control board for backup operation having a minimum configuration necessary for controlling the plurality of inverters.

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