JPH0893679A - Water supply - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In the conventional water supply system, if the control circuit containing the microcomputer that issues a command to the inverter device fails, unless the control circuit is a complete duplex system. It is necessary to promptly investigate the cause and restart the operation by the inverter device when the water supply cannot be avoided and when the inverter device stops. [Structure] A plurality of inverter devices 20, 21 having a control function for pumps 105, 106 and having a protection means for protecting themselves are provided in a one-to-one correspondence with variable speed homps 105, 10.
6 is connected to form a water supply device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device using a variable speed hoop which is driven by an inverter device having a pump control function and a protection means for protecting itself. The present invention relates to a water supply device capable of continuing water supply even when the operation is stopped by the protection operation of the protection means.

[0002]

2. Description of the Related Art A conventional water supply device using a variable-speed pump is provided with a control circuit having a built-in microcomputer for instructing the operation of an inverter device so that the frequency to be output to the inverter device can be adjusted according to the fluctuation of the demanded water amount. By issuing a command, the operating speed of the electric motor that drives the pump is changed, and the pressure on the discharge side of the pump is maintained in a constant relationship (for example, constant discharge pressure or constant end pressure) to continue water supply. For example, Japanese Patent Publication No. 6-52079 and Japanese Patent Publication No. 6-520 are related to this type of device.
For example, No. 80 is given.

Further, various protection circuits are incorporated in the inverter device combined with this type of water supply device in order to protect the inverter device itself. Examples of related protection systems for this kind of inverter device are, for example, JP-A-57-6576, JP-A-58-224575, JP-A-59-185170, and JP-A-60-84797.
JP-A-61-2224876 and the like can be mentioned.

In the water supply device incorporating the inverter device as described above, since various protection circuits are incorporated in the inverter device in order to protect the inverter device itself, the inverter device has various factors (instantaneous power failure,
It will stop due to overload, temperature rise, noise mixing, etc.). If water is cut off when the inverter is stopped, the problem becomes more serious.In such a case, usually, the motor for driving the pump is switched from inverter operation to constant speed operation with commercial power to avoid water cut. ing.

[0005]

However, in the conventional water supply device, when the control circuit incorporating the microcomputer fails in such a water supply system, it is possible to avoid water interruption unless the control circuit is a complete duplex system. could not.

Further, when the inverter device is stopped for some reason and the constant speed operation of the pump by the commercial power source is continued, the discharge pressure fluctuates greatly according to the change of the demanded water amount. Further, there is a problem that the operating power cost increases because the pump operates at full speed even under a light load.

Further, when the inverter device is stopped, it is required to promptly investigate the cause and restart the operation by the inverter device. Therefore, an alarm is issued from the inverter device and the maintenance manager of the water supply device is required. Was called urgently.

[0008] Therefore, it has been a problem to provide an improved device for such a water supply device that can continue the water supply while avoiding the stopped state of the incorporated inverter device as much as possible.

[0009]

The above object is to provide a variable frequency alternating current according to a pre-programmed operating plan by providing a sensor input means for inputting a signal of a pressure sensor attached to a water pipe and a protection means for protecting itself. Water supply including a plurality of inverter devices that generate electric power, a plurality of electric motors that are connected to the inverter devices in a one-to-one manner and operate at variable speeds by power supply from the respective inverter devices, and a variable speed pump that is connected to each of the electric motors. In the device, a water supply state detecting means for detecting a water supply state of the pump, and a restarting frequency of the inverter device is determined according to the water supply state detected by the water supply state detecting means, and the inverter device is stopped by another inverter device. It is solved by providing a water supply device characterized in that it is provided with a restarting means for restarting.

[0010]

Operation: The restarting means of the pump control device, when one inverter device is stopped by the action of its own protection means,
In the restarting means, the inverter device stopped by another inverter device is restarted. Therefore, if the cause of protection of the inverter device has been resolved at the time when the inverter device is given a restart command, the inverter device will be restarted, and the probability that the inverter device will stop completely will be reduced. It can be made smaller.

Since this pump control device does not require the control circuit having the microcomputer built therein and can be constituted by only two inverter devices, it becomes a complete dual system and the reliability of the system can be secured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram for explaining the overall structure of the water supply device of the embodiment, FIG. 2 is a circuit diagram of the control device portion of the water supply device, FIG. 3 is a detailed view of the terminals of the inverter device, and FIG. 4 is an inverter. FIG. 5 is a block diagram for explaining the software operation of the apparatus, and FIG. 5 is a diagram showing a flowchart of the basic processing portion described in the software block diagram.

In FIG. 1, the control device 1 comprises inverter devices 20, 21 and earth leakage breakers 40, 41,
The water supply unit 2 is controlled. The water supply unit 2 includes pumps 105, 106 with electric motors, pressure sensors 102, 11
2, flow switches 107 and 117, inflow side merging pipe 10
4, discharge side merging pipe 110, pressure tank 111, pressure gauge 1
14, 115 and various valves 100, 101, 103,
It is composed of 108, 109 and the like, and increases the water pressure of the water main 116 to supply water to the water distribution pipe 118.

The main circuit power supply 10 supplies three-phase AC power to the control device 1. The inverter devices 20 and 21 have terminals R,
Electric power is received from S and T, and variable frequency AC power is output to terminals U, V and W according to a pre-programmed operation plan to perform variable speed operation control of pumps 105 and 106 with electric motors.

The detection signals of the discharge side pressure sensor 112, the inflow side pressure sensor 102, and the flow rate switches 107 and 117 are input to the inverter devices 20 and 21, and the discharge pressure constant control or the terminal pressure is controlled according to the preprogrammed operation scheme. It is converted into variable frequency AC power for constant control and supplied to the motor-equipped pumps 105 and 106.

The pump with electric motor 105 and the pump with electric motor 106 perform automatic alternate operation. Therefore, the inverter device 20 and the inverter device 21 have the interlock signal 6
1 and 62 mutually monitor each other to control their own start / stop.

In FIG. 2, the noise filter 60 and the zero-phase reactor 50 attenuate the electrical noise superimposed on the main circuit power supply 10 to protect the inverter devices 20 and 21, and also generate the inverter devices 20 and 21. It is possible to prevent the electrical noise caused by the harmonic current from being fed back to the main circuit power supply 10. In addition, the zero-phase reactors 51 and 5
2, the inverter device 20, 21 is a pump with an electric motor 1
By suppressing the transient current applied to the motors 05 and 106, noise generated when the motor-equipped pumps 105 and 106 are driven is reduced.

The earth leakage breakers 40 and 41 detect earth leakage to prevent electric shock, and the pump 105 with an electric motor,
It is used as a power switch for maintenance / maintenance work of 106 and inverter devices 20, 21.

The digital operators 30 and 31 are accessories of the inverter devices 20 and 21 and operate the push button switches on the lower front to operate the inverter devices 20 and 21.
It is possible to monitor the operating status by performing the initial setting and the trial run operation, and by displaying the output frequency, load current, failure information, etc. of the inverter devices 20 and 21 on the numerical display on the front side.

In FIG. 3, inverter devices 20 and 21 are provided.
The input / output signal terminals provided in the above will be described below.

The interlock signals 61 and 62 are output signal terminals DO2 for notifying another inverter device that the inverter device has stopped (self trip) due to the action of its own protection means, and another interlock signal from the other inverter device. Input terminal DI1 for inputting restart command signal (alternate command ENQ)
And an input terminal DI2 for inputting a notification that another inverter device has stopped (counterpart trip) by the function of its own protection means, and a restart command signal (alternate command ACK) to another inverter device. It comprises an output signal terminal DO1. The sensor input terminals AI1 and AI2 are analog input terminals that take in signals from the pressure sensors 102 and 112. The signal FS of the flow switch 107 is F
It is taken in as a bit signal from the W terminal. The signals from the digital operators 30 and 31 are connected by the serial communication ports SD and RD. Further, in this embodiment,
Bit output terminals DO3 to DO5 are also provided to notify the abnormality detected by the inverter devices 20 and 21 to the outside.

FIG. 4 is a block diagram of software of the microcomputer incorporated in the inverter devices 20 and 21. In the figure, a normal operation 401 stores a pump operation bill, calculates an inverter output frequency and an operation / stop command based on the data from the interlock signal and the pressure sensor signal, and performs the LAD processing. Command to 402. In the LAD process 402, a detailed output frequency and output voltage command is generated based on the given output frequency, operation / stop command and the characteristics of the inverter itself, and P
The WM process 403 is instructed. The PWM processing 403 outputs a PWM signal (pulse width control signal) that drives a switching element in the inverter main circuit 407 so that the inverter outputs variable frequency power according to the given output frequency and output voltage command. Output to. The overcurrent reference value, which is the overcurrent detection level of the load current of the inverter, changes from the normal processing 401 to the trip processing 404.
The trip process 404 stores the overcurrent reference value. The trip processing 404 constantly monitors the above-mentioned overcurrent reference value and the load current of the inverter, and when the overload current is detected, generates trip information and notifies the command processing 405. Further, the PN voltage of the inverter main circuit (the voltage between the positive electrode and the negative electrode of the intermediate DC voltage) is input to the normal process 401, overvoltage and undervoltage are detected, and this detection signal is output to the trip process 404. Command processing 405
Is an abnormal process (overcurrent, overvoltage, undervoltage, etc.) from the inverter trip process 404, a communication process based on key information of the digital operators 30 and 31, an output of an LED display signal to the digital operators 30 and 31, a non-volatile state. Reading data from raw memory (EEPROM) 408
Exception processing such as writing is executed. The EEPROM input / output processing 406 needs to directly access the non-volatile memory 408 by an EPROM write command or a call request command from the command processing 405 and store the basic parameters necessary for the operation plan and failure history data even in the case of power failure. Transfer of certain data is executed with the command processing 405.

FIG. 5 is a flow chart showing an example of the normal process 401.

When the inverter devices 20 and 21 are powered on, a normal process 401 executes an initial setting process 501 to execute a parameter discharge target pressure H necessary for controlling the pump operation.
O, minimum operating speed NS, maximum operating speed Nf, speed change range Δ
N, the re-operation determination time T, and the number of re-operations m are read from the non-volatile memory 408 in the previous period and set in the register for calculating the output frequency of the inverter.

Next, in the normal process 401, the process 502 is executed, and the pressure sensors 102 and 112 and the flow switch 10 are executed.
The signals from the terminals 7 and 117 are input terminals AI1 and AI, respectively.
2. Input from FW.

Next, the normal process 401 executes the process 503, and the control unit 1 receives the interlock signals 61 and 62.
While inputting the operating state of the other inverter device (hereinafter referred to as the other inverter device) in the above, the operating state of itself is output to the other inverter device.

Next, in the normal process 401, the process 504 is executed, the operating state of the partner inverter device is examined, and if normal, the process proceeds to the next pump control process 505, and if abnormal, the process 510 is executed. After executing the restarting process of the partner inverter device, the process proceeds to the next process 505.

Next, in the normal process 401, the process 505 is executed to compare the present water supply pressure H with the target pressure HO to obtain H
If HO> H, the process proceeds to step 508 and step 509 to perform deceleration processing, and if HO> H, step 506 and step 5
Proceed to 07 to perform speed-up processing. When H = HO, the speed changing process is not executed.

Next, the normal processing 401 returns to the execution of the processing 502, and the same processing is repeatedly executed thereafter.

By repeating the above processing, the normal processing 40
1 performs the monitoring of the status of the partner inverter, the restart process at the time of abnormality, and the variable speed operation process of the water supply pump in parallel.

In the above description of the embodiment, an example using two inverter devices is shown, but even when three or more inverter devices are used, the interlock signal can be communicated between the respective inverter devices. It can be done similarly.

[0033]

As described above, the present invention has an inverter device having a protection means for protecting itself and generating a variable frequency AC power, and an electric motor which is operated at a variable speed by power supply from the inverter device. In a water supply device including a pump connected to the electric motor and a pump control device that controls the inverter device so that the pressure of the water supply discharged from the pump has a predetermined constant relationship, the inverter device is a protection means of itself. The present invention provides a water supply device using a variable speed pump provided with a pump control device having a restarting means for restarting the inverter device when the inverter device is stopped due to the operation. It is possible to avoid water supply as much as possible and continue water supply.

Further, since the pump control is executed by the inverter device alone, it is possible to realize a complete dual system control which does not require the external control device in the conventional example, and the total number of parts of the control device is about 30%. It is possible to reduce the cost, improve the reliability of the water supply device, and reduce the cost.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an overall configuration of a water supply device according to an embodiment.

FIG. 2 is a circuit diagram of a control device portion of the water supply device.

FIG. 3 is a detailed view for explaining the terminals of the inverter device.

FIG. 4 is a block diagram for explaining a software operation of the inverter device.

FIG. 5 is a flowchart of a basic processing portion described in the block diagram of the software.

[Explanation of symbols]

10 ... Main circuit power source, 20, 21 ... Inverter device,
30, 31 ... Digital operator, 40, 41 ... Leakage breaker, 50, 51, 52 ... Zero-phase reactor, 61,
62 ... Interlock signal, 100 ... Double check valve, 1
01 ... Check valve, 102, 112 ... Pressure sensor, 10
3, 108, 109 ... Gate valve, 104 ... Inflow side merging pipe, 105, 106 ... Pump with electric motor, 107,
117 ... Flow switch, 110 Discharge side merging pipe, 1
14, 115 ... Pressure gauge, 116 ... Water main, 117
…Water pipe.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 27, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Water supply device

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply device using a variable speed hoop which is driven by an inverter device having a pump control function and a protection means for protecting itself. The present invention relates to a water supply device capable of continuing water supply even when the operation is stopped by the protection operation of the protection means.

[0002]

2. Description of the Related Art A conventional water supply device using a variable-speed pump is provided with a control circuit having a built-in microcomputer for instructing the operation of an inverter device so that the frequency to be output to the inverter device can be adjusted according to the fluctuation of the demanded water amount. By issuing a command, the operating speed of the electric motor that drives the pump is changed, and the pressure on the discharge side of the pump is maintained in a constant relationship (for example, constant discharge pressure or constant end pressure) to continue water supply. For example, Japanese Patent Publication No. 6-52079 and Japanese Patent Publication No. 6-520 are related to this type of device.
For example, No. 80 is given.

Further, various protection circuits are incorporated in the inverter device combined with this type of water supply device in order to protect the inverter device itself. Examples of related protection systems for this kind of inverter device are, for example, JP-A-57-6576, JP-A-58-224575, JP-A-59-185170, and JP-A-60-84797.
JP-A-61-2224876 and the like can be mentioned.

In the water supply device incorporating the inverter device as described above, since various protection circuits are incorporated in the inverter device in order to protect the inverter device itself, the inverter device has various factors (instantaneous power failure,
It will stop due to overload, temperature rise, noise mixing, etc.). If water is cut off when the inverter is stopped, the problem becomes more serious.In such a case, usually, the motor for driving the pump is switched from inverter operation to constant speed operation with commercial power to avoid water cut. ing.

[0005]

However, in the conventional water supply device, when the control circuit incorporating the microcomputer fails in such a water supply system, it is possible to avoid water interruption unless the control circuit is a complete duplex system. could not.

Further, when the inverter device is stopped for some reason and the constant speed operation of the pump by the commercial power source is continued, the discharge pressure fluctuates greatly according to the change of the demanded water amount. Further, there is a problem that the operating power cost increases because the pump operates at full speed even under a light load.

Further, when the inverter device is stopped, it is required to promptly investigate the cause and restart the operation by the inverter device. Therefore, an alarm is issued from the inverter device and the maintenance manager of the water supply device is required. Was called urgently.

[0008] Therefore, it has been a problem to provide an improved device for such a water supply device that can continue the water supply while avoiding the stopped state of the incorporated inverter device as much as possible.

[0009]

The above object is to provide a variable frequency alternating current according to a pre-programmed operating plan by providing a sensor input means for inputting a signal of a pressure sensor attached to a water pipe and a protection means for protecting itself. Water supply including a plurality of inverter devices that generate electric power, a plurality of electric motors that are connected to the inverter devices in a one-to-one manner and operate at variable speeds by power supply from the respective inverter devices, and a variable speed pump that is connected to each of the electric motors. In the device, a water supply state detecting means for detecting a water supply state of the pump, and a restarting frequency of the inverter device is determined according to the water supply state detected by the water supply state detecting means, and the inverter device is stopped by another inverter device. It is solved by providing a water supply device characterized in that it is provided with a restarting means for restarting.

[0010]

Operation: The restarting means of the pump control device, when one inverter device is stopped by the action of its own protection means,
In the restarting means, the inverter device stopped by another inverter device is restarted. Therefore, if the cause of protection of the inverter device has been resolved at the time when the inverter device is given a restart command, the inverter device will be restarted, and the probability that the inverter device will stop completely will be reduced. It can be made smaller.

Since this pump control device does not require the control circuit having the microcomputer built therein and can be constituted by only two inverter devices, it becomes a complete dual system and the reliability of the system can be secured.

[0012]

BRIEF DESCRIPTION One embodiment of the present invention by FIGS. 1-9.

FIG. 1 is a block diagram for explaining the overall structure of the water supply device of the embodiment, FIG. 2 is a circuit diagram of the control device portion of the water supply device, FIG. 3 is a detailed view of the terminals of the inverter device, and FIG. 4 is an inverter. FIG. 5 is a block diagram for explaining the software operation of the apparatus, FIG. 5 is a flowchart of the basic processing part described in the block diagram of the software , and FIG. 6 is the software.
Of the inverter device included in the basic processing part of the ware
Flowchart showing details of the transfer process, FIGS. 7 to 9 are three
Interlock signal that can be applied to the above inverter devices
It is a figure which shows another Example.

In FIG. 1, the control device 1 comprises inverter devices 20, 21 and earth leakage breakers 40, 41,
The water supply unit 2 is controlled. The water supply unit 2 includes pumps 105, 106 with electric motors, pressure sensors 102, 11
2, flow switches 107 and 117, inflow side merging pipe 10
4, discharge side merging pipe 110, pressure tank 111, pressure gauge 1
14, 115 and various valves 100, 101, 103,
It is composed of 108, 109 and the like, and increases the water pressure of the water main 116 to supply water to the water distribution pipe 118.

The main circuit power supply 10 supplies three-phase AC power to the control device 1. The inverter devices 20 and 21 have terminals R,
Electric power is received from S and T, and variable frequency AC power is output to terminals U, V and W according to a pre-programmed operation plan to perform variable speed operation control of pumps 105 and 106 with electric motors.

The detection signals of the discharge side pressure sensor 112, the inflow side pressure sensor 102, and the flow rate switches 107 and 117 are input to the inverter devices 20 and 21, and the discharge pressure constant control or the terminal pressure is controlled according to the preprogrammed operation scheme. It is converted into variable frequency AC power for constant control and supplied to the motor-equipped pumps 105 and 106.

The pump with electric motor 105 and the pump with electric motor 106 perform automatic alternate operation. Therefore, the inverter device 20 and the inverter device 21 have the interlock signal 6
1 and 62 mutually monitor each other to control their own start / stop.

In FIG. 2, the noise filter 60 and the zero-phase reactor 50 attenuate the electrical noise superimposed on the main circuit power supply 10 to protect the inverter devices 20 and 21, and also generate the inverter devices 20 and 21. It is possible to prevent the electrical noise caused by the harmonic current from being fed back to the main circuit power supply 10. In addition, the zero-phase reactors 51 and 5
2, the inverter device 20, 21 is a pump with an electric motor 1
By suppressing the transient current applied to the motors 05 and 106, noise generated when the motor-equipped pumps 105 and 106 are driven is reduced.

The earth leakage breakers 40 and 41 detect earth leakage to prevent electric shock, and the pump 105 with an electric motor,
It is used as a power switch for maintenance / maintenance work of 106 and inverter devices 20, 21.

The digital operators 30 and 31 are accessories of the inverter devices 20 and 21 and operate the push button switches on the lower front to operate the inverter devices 20 and 21.
It is possible to monitor the operating status by performing the initial setting and the trial run operation, and by displaying the output frequency, load current, failure information, etc. of the inverter devices 20 and 21 on the numerical display on the front side.

In FIG. 3, inverter devices 20 and 21 are provided.
The input / output signal terminals provided in the above will be described below.

The interlock signals 61 and 62 are output signal terminals DO2 for notifying another inverter device that the inverter device has stopped (self trip) due to the action of its own protection means, and another interlock signal from the other inverter device. Input terminal DI1 for inputting restart command signal (alternate command ENQ)
And an input terminal DI2 for inputting a notification that another inverter device has stopped (counterpart trip) by the function of its own protection means, and a restart command signal (alternate command ACK) to another inverter device. It comprises an output signal terminal DO1. The sensor input terminals AI1 and AI2 are analog input terminals that take in signals from the pressure sensors 102 and 112. The signal FS of the flow switch 107 is F
It is taken in as a bit signal from the W terminal. The signals from the digital operators 30 and 31 are connected by the serial communication ports SD and RD. Further, in this embodiment,
Bit output terminals DO3 to DO5 are also provided to notify the abnormality detected by the inverter devices 20 and 21 to the outside.

FIG. 4 is a block diagram of software of the microcomputer incorporated in the inverter devices 20 and 21. In the figure, a normal operation 401 stores a pump operation bill, calculates an inverter output frequency and an operation / stop command based on the data from the interlock signal and the pressure sensor signal, and performs the LAD processing. Command to 402. In the LAD process 402, a detailed output frequency and output voltage command is generated based on the given output frequency, operation / stop command and the characteristics of the inverter itself, and P
The WM process 403 is instructed. The PWM processing 403 outputs a PWM signal (pulse width control signal) that drives a switching element in the inverter main circuit 407 so that the inverter outputs variable frequency power according to the given output frequency and output voltage command. Output to. The overcurrent reference value, which is the overcurrent detection level of the load current of the inverter, changes from the normal processing 401 to the trip processing 404.
The trip process 404 stores the overcurrent reference value. The trip processing 404 constantly monitors the above-mentioned overcurrent reference value and the load current of the inverter, and when the overload current is detected, generates trip information and notifies the command processing 405. Further, the PN voltage of the inverter main circuit (the voltage between the positive electrode and the negative electrode of the intermediate DC voltage) is input to the normal process 401, overvoltage and undervoltage are detected, and this detection signal is output to the trip process 404. Command processing 405
Is an abnormal process (overcurrent, overvoltage, undervoltage, etc.) from the inverter trip process 404, a communication process based on key information of the digital operators 30 and 31, an output of an LED display signal to the digital operators 30 and 31, a non-volatile state. Reading data from raw memory (EEPROM) 408
Exception processing such as writing is executed. The EEPROM input / output processing 406 needs to directly access the non-volatile memory 408 by an EPROM write command or a call request command from the command processing 405 and store the basic parameters necessary for the operation plan and failure history data even in the case of power failure. Transfer of certain data is executed with the command processing 405.

FIG. 5 is a flow chart showing an example of the normal process 401.

When the inverter devices 20 and 21 are powered on, a normal process 401 executes an initial setting process 501 to execute a parameter discharge target pressure H necessary for controlling the pump operation.
O, minimum operating speed NS, maximum operating speed Nf, speed change range Δ
N, the re-operation determination time T, and the number of re-operations m are read from the non-volatile memory 408 in the previous period and set in the register for calculating the output frequency of the inverter.

Next, in the normal process 401, the process 502 is executed, and the pressure sensors 102 and 112 and the flow switch 10 are executed.
The signals from the terminals 7 and 117 are input terminals AI1 and AI, respectively.
2. Input from FW.

Next, the normal process 401 executes the process 503, and the control unit 1 receives the interlock signals 61 and 62.
While inputting the operating state of the other inverter device (hereinafter referred to as the other inverter device) in the above, the operating state of itself is output to the other inverter device.

Next, in the normal process 401, the process 504 is executed, the operating state of the partner inverter device is examined, and if normal, the process proceeds to the next pump control process 505, and if abnormal, later in FIG. After performing the process 510 to be described in detail and the re-operation process of the partner inverter device, the next process 505 is performed.
Proceed to.

Next, in the normal process 401, the process 505 is executed to compare the present water supply pressure H with the target pressure HO to obtain H
If HO> H, the process proceeds to step 508 and step 509 to perform deceleration processing, and if HO> H, step 506 and step 5
Proceed to 07 to perform speed-up processing. When H = HO, the speed changing process is not executed.

Next, the normal processing 401 returns to the execution of the processing 502, and the same processing is repeatedly executed thereafter.

FIG . 6 shows an inverter included in the normal processing 401.
Flow of details of process 510, which is the re-operation process of the data device
Shown in a chart and explained below.

By executing the processing 504, the other inverter device is installed.
If it is determined that the
510 is executed.

In process 510, first, in process 601, the inverter is executed.
Determine the number of restarts MAX m of the data unit. INVA
To restart the data unit, discharge the control circuit of the unit.
It is necessary and usually takes 3 to 5 seconds for the re-operation processing time.
During this time, even if the pump is stopped, in the embodiment, the pressure tank is
Because it is equipped with the ku 111, the water supply amount (demand water amount)
The discharge pressure H does not drop immediately in a small range.
The time to execute the restart operation process of the inverter multiple times.
I can afford it. On the other hand, if the water supply increases,
The margin is reduced and it is necessary to limit the number of restart operations.
It Therefore, as shown in process 7, the re-operation according to the water supply condition
The initial value m0 of the number of transfer processing is set in advance from the digital operator.
Register it in the inverter device and
The larger the rotation speed N at the time of equipment failure, that is, water supply at the time of failure
The larger the amount, the smaller the value of the number of restarting operations MAXm.
Set.

Next, in step 603, an error
A restart command is sent to the burner device, and the restart operation is performed in step 603.
Wait for processing time T (T = 3 seconds in the embodiment), and then process 60
Check in 4 whether the inverter has restarted. Restart
If so, the abnormality history is recorded according to the processing 610.
After that, it returns to normal processing. If not restarted, process 6
05, processing 609, processing 603, processing 604 in a loop
Repeat the restarting process by.

The number of restarting operations reaches MAXm.
Then, process 608 is executed and the discharge pressure of the pump is guaranteed to be minimum.
While the pressure is higher than H3, the inverter is restarted.
Processing 607, processing 609, processing 602, processing 603
The process 604 and the process 605 continue in a loop. This process
607 is the maximum even if the number of restarting operations exceeds MAXm.
As long as the low guarantee pressure H3 can be secured,
To the inverter device to send an error message to the inverter device
Water supply that avoids water as much as possible
It is.

By repeating the above processing, the normal processing 40
1 is the monitoring of the status of the partner inverter and the restart process in case of an abnormality.
And the variable speed operation process of the water supply pump are executed in parallel.
It

Next, FIGS. 7 to 9 show three or more inverters.
Another example of the interlock signals 61 and 62 applicable to the device
An example will be described.

In FIG . 7, the transmission port of the inverter device 71 is
TXD and the receiving port RXD of the inverter device 72
The inverter device 72 is connected by the interlock signal 62.
Transmission port TXD and reception port of the inverter device 71
RXDs are connected by interlock signal 61 and drive each other
Status monitoring and operation command transmission (the restart operation instruction
(Including decree) is performed by one-to-one serial communication. here
If the number of inverter devices increases to 3 or 4,
The device needs to communicate with all other inverter devices,
The transmission port TXD and the reception port RXD are respectively
Inverter device
It is uneconomical because of the cost of communication channels.

Therefore, as shown in FIG.
1 of the transmission port TXD and the reception port RXD
Connected in a loop with the book interlock signal,
(A) As shown in the communication data format, all
The data of the burner device can be placed in this loop for communication.
And each inverter device has a transmitter port TXD and a receiver port.
If there is one port for each RXD, all other
Can communicate with the burner device. In the same figure (a)
The ST. NO. Is a code unique to each inverter device
And the other inverter device is the number of the inverter device
To identify whether the data is
ATA is the operating status monitor and the transmission data of the operation command
This is the main body, and the last CRC implements error detection of communication data.
This is the data to execute. Each inverter device is its own
The data in the transmit data buffer of the transmission port TXD
Send out and receive data from all other inverter devices
Received at port RXD and stored in own receive data buffer
I do.

FIG . 9 shows the previous transmission data buffer and reception data.
3 is an example of memory allocation of a data buffer. Smell in Figure 9
Inverters 1 to 4 send 1 kilobyte each.
256-byte transmission area with receive buffer memory
Are assigned so that they do not overlap each other. Each invar
The device puts the data in its transmission area into its own operating state.
Corresponding communication is always sent and sent as the above interlock signal
However, it constantly monitors the data in the reception area to switch operation or make an error.
Corresponds to the processing of time.

Since the above communication method is serial communication,
There is a concern that the response speed is slow and it is not suitable as an interlock signal.
However, in the case of the embodiment shown in FIG.
Communicated at a quasi-serial communication speed of 19.5 Kbps
Then, the response speed is about 1 second,
It's fast enough.

[0042]

As described above, the present invention has an inverter device having a protection means for protecting itself and generating a variable frequency AC power, and an electric motor which is operated at a variable speed by power supply from the inverter device. In a water supply device including a pump connected to the electric motor and a pump control device that controls the inverter device so that the pressure of the water supply discharged from the pump has a predetermined constant relationship, the inverter device is a protection means of itself. The present invention provides a water supply device using a variable speed pump provided with a pump control device having a restarting means for restarting the inverter device when the inverter device is stopped due to the operation. It is possible to avoid water supply as much as possible and continue water supply.

Further, since the control of the pump is executed by the inverter device alone, it is possible to realize a complete dual system control which does not require the external control device in the conventional example, and the total number of parts of the control device is about 30%. It is possible to reduce the cost, improve the reliability of the water supply device, and reduce the cost.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining the overall configuration of a water supply device according to an embodiment of the present invention .

FIG. 2 is a circuit diagram of a control device portion of the water supply device according to the present invention .

FIG. 3 is a detailed view of the terminals of the inverter device according to the present invention .

FIG. 4 is a block diagram illustrating a software operation of the inverter device according to the present invention .

FIG. 5 is a flowchart of a basic processing part described in the block diagram of the software according to the present invention .

FIG. 6 is a basic process of the software according to the present invention.
Details of the re-operation process of the inverter device included in the
The flowchart which shows.

FIG. 7 shows a case where two inverter devices according to the present invention are used.
FIG. 6 is an embodiment diagram showing transmission and reception of interlock signals in the case of
It

FIG. 8 shows three or more inverter devices according to the present invention.
FIG. 6 is a diagram showing another embodiment of the interlock signal applicable to
is there.

FIG. 9 shows three or more inverter devices according to the present invention.
Memory allocation of another embodiment of interlock signal applicable to
It is a figure which shows attachment.

[Explanation of Codes] 10 ... Main circuit power supply, 20, 21 ... Inverter device,
30, 31 ... Digital operator, 40, 41 ... Leakage breaker, 50, 51, 52 ... Zero-phase reactor, 61,
62 ... Interlock signal, 71-7n ... Inverter device
Installation, 100 ... Double check valve, 101 ... Check valve, 10
2, 112 ... Pressure sensor, 103, 108, 109 ...
Gate valve, 104 ... Inflow side confluence pipe, 105, 106 ...
Pump with electric motor, 107, 117 ... Flow switch, 110 Discharge side confluence pipe, 114, 115 ... Pressure gauge, 116 ... Water main, 117 ... Water distribution pipe.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 3]

[Figure 7]

[Figure 4]

[Figure 8]

[Figure 5]

[Figure 6]

[Figure 9] ─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] May 19, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

[Means for Solving the Problems] The above problems relate to water supply such as a pressure sensor or a flow rate sensor attached to a water pipe.
A plurality of inverter devices for generating variable frequency AC power according to a pre-programmed operating plan, which are provided with a sensor input means for inputting an information signal, and a protection means for protecting themselves, and connected to each of the inverter devices. the <br/> a plurality of motors to drive variable speed by feeding from the inverter device, the coupled the water pipe to each of the electric motor
In the water supply apparatus comprising a variable speed pump for water supply, the
Each inverter device has a
Obstacles are monitored and other inverters are activated by the protection measures.
If the inverter device stops, the faulty inverter device
Restarting means that outputs a motion command or a faulty inverter device
Means for operating a normal inverter device instead of the
Is solved by providing a water supply system, characterized in that the obtained.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

FIG. 1 is a block diagram for explaining the overall structure of the water supply device of the embodiment, FIG. 2 is a circuit diagram of the control device portion of the water supply device, FIG. 3 is a detailed view of the terminals of the inverter device, and FIG. 4 is an inverter. FIG. 5 is a block diagram for explaining the software operation of the device, FIG. 5 is a flowchart of the basic processing part described in the block diagram of the software, and FIG. 6 is a detailed flowchart of the re-operation process of the counterpart inverter device included in the basic processing part of the software. The flowcharts shown in FIGS. 7 to 9 are diagrams showing another embodiment of the interlock signal applicable to three or more inverter devices.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

In FIG. 2, the noise filter NF 60 and the zero-phase reactor ZCL 50 attenuate the electrical noise superimposed on the main circuit power source 10, and the inverter device 2
0 and 21 are protected, and the inverter devices 20 and 2 are
It is possible to prevent the electric noise caused by the harmonic current generated by 1 from returning to the main circuit power supply 10. Further, the zero-phase reactors 51 and 52 suppress the transient current applied to the pumps 105 and 106 with electric motors by the inverter devices 20 and 21, thereby reducing noise generated when the pumps 105 and 106 with electric motors are driven.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

The digital operators 30 and 31 are accessories of the inverter devices 20 and 21 and operate the push button switches on the lower front to operate the inverter devices 20 and 21.
Initialization and commissioning operations can also like that make displaying the output frequency, the load current and fault information of the inverter device 20, 21 on top of the front of the numeric displays, it can be monitored operational status.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

FIG. 6 is a flow chart showing the details of the process 510 which is the re-operation process of the partner inverter device included in the normal process 401, and will be described below.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

When it is determined in the execution of the processing 504 that the operating condition of the partner inverter device is abnormal, this processing 5
10 is executed.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

In process 510, first, in process 601, the number of times the inverter device is restarted MAX m is determined. The restarting of the inverter device requires the discharge time of the control circuit of the device, which usually takes 3 to 5 seconds to restart the operation.
In the meantime, even if the pump is stopped, the pressure tank 111 is provided in the embodiment, so that the discharge pressure H does not immediately decrease in a range where the water supply amount (demand water amount) is small, and the restart operation process of the inverter device is performed. There is enough time to execute multiple times. On the other hand, when the amount of water supply increases, the time margin decreases, and it is necessary to limit the number of restart operations. The amount of water supply can be detected directly by the flow sensor.
With this, the number of restarts MAXm can be determined.
It However, pump speed N, discharge flow rate Q, and discharge
Between the pressure H and the Q-H characteristic with N as a parameter
There is a predetermined relationship known as
MAXm as in process 7 using the pump rotation speed N
I can decide. That is, as shown in process 7, the initial value m0 of the number of restarting operations according to the water supply condition is registered in advance in the inverter device from the digital operator, and the larger the rotation speed N at the time of failure of the failed inverter device,
That is, the larger the amount of water supply at the time of failure, the more the number of restarting operations MA
Set a small value for Xm.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0035

[Correction method] Change

[Correction content]

When the number of restarting operations reaches the MAXm, a processing 607 is executed, and while the discharge pressure of the pump is higher than the minimum guaranteed pressure H3, the restarting processing of the inverter device is carried out by the processings 607, 609 and 602. Process 603
The process 604 and the process 605 continue in a loop. In this processing 607, while the minimum guaranteed pressure H3 can be secured even if the number of re-operation processes exceeds MAXm, a re-operation command is sent to the inverter device as much as possible to avoid the abnormal condition of the inverter device and continue the water supply. It was made possible.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

In process 607, the discharge pressure is the lowest.
When the pressure falls below the guarantee pressure H3, the processing 608 is actually performed.
Is performed. Step 608 stops the inverter in abnormal condition.
And instead of operating with a normal inverter device
Performs a process that fixes the operation mode and also issues a failure alarm
I do. By repeating the above processing, the normal processing 401
Monitors the status of the other inverter, restarts when there is an abnormality, and shifts the water supply pump in parallel. Also
In the process 7, MAXm is determined by the rotation speed N, but in general,
The water supply is higher during daytime operation of the pump than during nighttime operation.
Pay attention to the fact that the number of restarts during daytime operation is
The number of restarts during operation is set lower than
You can also make a definite decision.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

[0040] Figure 9 is the transmission data buffer, which is an example of memory allocation of the receive data buffer. In FIG. 9, each of the inverter devices 1 to 4 has a transmission / reception buffer memory of 1 kilobyte, and transmission areas of 256 bytes are allocated so as not to overlap each other. Each inverter device constantly communicates the data of its own transmission area according to its operating state, sends it out as the interlock signal, and constantly monitors the data of the receiving area to cope with the operation switching and the processing at the time of abnormality.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction content]

[0042]

As described above , according to the present invention ,
If the inverter device stops due to its own protective measures.
If the inverter device is replaced by another inverter device,
A restarting means for starting is provided, and the restart
Inverter device to execute dynamic driving process
Thus, it is possible to realize complete dual system control and
Water supply device
The reliability of can be improved.

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0043

[Correction method] Change

[Correction content]

Further, it is possible to eliminate the need for an external control device.
Therefore, the number of parts of the entire control device can be reduced, which is effective in cost reduction.

[Procedure Amendment 14]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (7)

[Claims] 1. A plurality of inverter devices for generating a variable frequency AC power according to a pre-programmed operating plan, comprising a sensor input means for inputting a signal of a pressure sensor attached to a water pipe and a protection means for protecting itself. A plurality of electric motors that are connected to the inverter device in a one-to-one manner and that are operated at variable speeds by power supply from each inverter device,
In a water supply device comprising a variable speed pump connected to each of the electric motors, a water supply state detecting means for detecting a water supply state of the pump, and a re-inverter of the inverter device according to the water supply state detected by the water supply state detecting means. A water supply device comprising restarting means for determining the number of times of starting and restarting the stopped inverter device by another inverter device. 2. The water supply state detecting means for detecting the water supply state of the pump is a guaranteed pressure detector for detecting that the discharge pressure of the pump is below a predetermined guaranteed pressure, and the guaranteed pressure detector is The water supply device according to claim 1, further comprising: the pump control device including the re-operation unit that repeats a re-operation operation of the inverter device while detecting a guaranteed pressure or more. 3. The water supply device according to claim 1, further comprising the pump control device including the re-operation unit in which a plurality of restarting times of the inverter device are set in advance in accordance with a water supply state of the pump. 4. A water supply state detecting means for detecting a water supply state of the pump is means for detecting an increase / decrease in the water supply amount from the pump, and the increase in the water supply amount from the pump is detected by the water supply amount increase / decrease detecting means. The water supply device according to claim 1, further comprising: the re-operation unit configured to reduce the number of restarts of the inverter device in the case of the occurrence. 5. A water supply state detecting means for detecting a water supply state of the pump is a pump speed detecting means for detecting an operating speed of the pump, and the pump speed detecting means detects that the operating speed of the pump is high. The water supply device according to claim 1, further comprising the restarting unit that reduces the number of restarts of the inverter device. 6. The water supply state detecting means for detecting the water supply state of the pump is a flow rate detector for detecting the water supply rate of the pump connected to the discharge side of the pump, and the detected flow rate detected by the flow rate detector is 2. The water supply device according to claim 1, further comprising the restarting means for reducing the number of restarts of the inverter device as the number of restarts increases. 7. A water supply state detecting means for detecting a water supply state of the pump is operated during a daytime when the water supply amount from the pump is increased and during nighttime operation when a water supply amount is reduced from the pump. Is a means of detecting time,
2. The water supply device according to claim 1, further comprising the restarting unit that reduces the number of restarts of the inverter device during the daytime operation as compared with during the nighttime operation.