Water supply device and water supply method

Abstract

To provide a water supply device which, even when phenomena suspected for causing a future failure of equipment occur, outputs a signal of an alarm or failure only for a phenomenon which affects a water supply pressure, thereby facilitating monitoring and management.SOLUTION: When a discharge pressure exceeds a set pressure range, and an abnormality of at least one of a pump, an electric motor, a pressure detector, an electric power conversion device, and a memory is determined, an abnormal signal is not output.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a water supply device and a water supply method. [Background technology]

[0002] A water outage is a situation that must be avoided in a water supply system, so in the past, an alarm or fault signal was issued in response to malfunction or failure of the equipment constituting the water supply system, and the equipment manager or the person in charge of the equipment service management company was notified, and measures were taken before the water supply was cut off. For example, Patent Document 1 is an example of a related technology. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-183817 A Summary of the Invention [Problem to be solved by the invention]

[0004] The pump system described in the above-mentioned Patent Document 1 is said to be able to detect water leakage from the relationship between the change in pressure on the secondary side of the pump and the drive of the motor.

[0005] However, alarm and fault signals from equipment do not necessarily indicate events that will lead to a water outage, and depending on the alarm level settings, alarms may be issued frequently, which can increase the effort required to check the status of equipment.

[0006] Furthermore, with the development of equipment monitoring technology, it has become possible to centrally monitor and manage facilities remotely. However, on the other hand, when monitoring facilities remotely, alarm and failure signals for the target facilities arrive from various locations, which takes time to check each one, and there is a risk that important alarm and failure signals will not be noticed until later.

[0007] Furthermore, excessive alarms and fault signals may cause anxiety to users and managers.

[0008] The object of the present invention is to facilitate monitoring and management by outputting an alarm or fault signal only for events that actually affect the water supply pressure, even among events that are thought to indicate a tendency for equipment to fail in a water supply system. [Means for solving the problem]

[0009] One embodiment of the present invention is a water supplying device having a pump, an electric motor that drives the pump, a pressure detection unit that detects the pump's discharge pressure, a power conversion device that controls the rotation speed of the electric motor, a memory unit that stores predetermined values ​​used to control the pump, a calculation unit that determines whether there is an abnormality in at least one of the pump, the electric motor, the pressure detection unit, the power conversion device and the memory unit, and a signal processing unit that outputs an abnormality signal when the calculation unit determines that there is an abnormality, wherein the memory unit stores at least a predetermined set pressure range, the calculation unit controls the rotation speed of the electric motor based on the frequency at which the electric motor is driven, and controls the pump so that the discharge pressure of the pump is within an allowable pressure range, and the signal processing unit outputs the abnormality signal when the discharge pressure exceeds the set pressure range and determines an abnormality in at least one of the pump, the electric motor, the pressure detection unit, the power conversion device and the memory unit. Effect of the Invention

[0010] According to one aspect of the present invention, in a water supply system, among events that are thought to indicate a tendency for equipment to fail, only those events that actually affect the water supply pressure are output as alarm or fault signals, making monitoring and management easier. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing a configuration of a water supply device in Examples 1 to 5. [Diagram 2] FIG. 1 is a diagram showing a configuration of a control device in Examples 1 to 5. [Diagram 3] FIG. 13 is a diagram showing the configuration of a volatile memory of a storage unit in Examples 1 to 5. [Figure 4]FIG. 2 is a diagram showing a part of the configuration of a nonvolatile memory of a storage unit in Examples 1 to 5. [Diagram 5] FIG. 2 is a diagram showing a part of the configuration of a nonvolatile memory of a storage unit in Examples 1 to 5. [Figure 6] FIG. 2 is a diagram showing a control flow in the first embodiment. [Figure 7] FIG. 2 is a diagram showing a control flow in the first embodiment. [Figure 8] FIG. 2 is a diagram showing a control flow in the first embodiment. [Figure 9] FIG. 2 is a diagram showing a control flow in the first embodiment. [Figure 10] FIG. 2 is a diagram showing a control flow in the first embodiment. [Figure 11] FIG. 11 is a diagram showing a control flow in the second embodiment. [Figure 12] FIG. 11 is a diagram showing a control flow in the third embodiment. [Figure 13] FIG. 13 is a diagram showing a control flow in the fourth embodiment. [Figure 14] FIG. 13 is a diagram showing a control flow in the fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0013] The present invention is designed to output an abnormality signal when the pump discharge pressure exceeds a preset pressure range and when an abnormality is found in any one or more of the pump, electric motor, power conversion device, pressure detection unit, and / or memory unit.

[0014] FIG. 1 is an overall configuration diagram of a water supply apparatus according to a first embodiment of the present invention.

[0015] The No. 1 pump 11 and the No. 2 pump 12 are driven by No. 1 electric motor 21 and No. 2 electric motor 22, respectively. The suction section of each pump is connected to the water source side via a suction pipe 35. On the water source side, in the direct connection type, water is supplied from the water main (not shown), and in the water tank type, water is supplied from a water tank (not shown).

[0016] In the case of a direct connection type, an inlet pressure sensor 41 is provided in the suction pipe to detect the pressure in the water main. An inlet gate valve 33 is provided between the suction pipe and each pump to stop the flow of water to the water supply system when the water supply system is maintained.

[0017] In the case of a direct-discharge type, the discharge pipe 36 on the demand side is connected to a demand-side water supply pipe to supply water to, for example, a water faucet in an apartment building. In the case of an elevated water tank type, this discharge pipe is connected to a demand-side water supply pipe to supply water to the elevated water tank. Although not shown, a pressure tank may be provided on the discharge pipe to suppress sudden fluctuations in the water supply pressure and to extend the interval between pump stops during automatic operation.

[0018] Discharge side gate valves 34 are provided between the discharge pipe and each pump to stop the flow of water to the water supply equipment when the water supply equipment is maintained. Furthermore, No. 1 check valves 31 and No. 2 check valves 32 are provided between the discharge side gate valves and each pump to prevent water delivered by a pump from flowing back through the other pump. A discharge side pressure sensor 42 is provided on this discharge pipe to detect the pressure of the water main. The discharge side pressure of the pump is controlled (for example, constant discharge pressure control, constant estimated terminal pressure control) based on the detection value of the discharge side pressure sensor 42.

[0019] The control device 71 has a panel shape, for example, like a control panel. The No. 1 inverter (power conversion device for the No. 1 motor) 51 and the No. 2 inverter (power conversion device for the No. 2 motor) 52, which are internal components of the control device, are each supplied with power from a power source side (not shown), and change the frequency of the output voltage to change and drive the rotation speed of each motor.

[0020] The signal input unit 1 receives a pressure signal detected by an inlet side pressure sensor 41. Similarly, the signal input unit 2 receives a pressure signal detected by a discharge side pressure sensor .

[0021] FIG. 2 is a detailed configuration diagram of the control device.

[0022] The calculation unit 91 determines the operation method of each motor in accordance with the control parameters stored in the memory unit 93, the instructions input from the operation unit 92, or in response to the signal input from the signal processing unit 94, and instructs the No. 1 control unit 81 and the No. 2 control unit 82 to operate / stop the motors and change the rotation speed.

[0023] Each control unit follows instructions from the calculation unit to turn on / off the output voltage of the inverter it controls and change the frequency. The calculation unit 91 displays on a display unit 95 the display contents requested by an operation unit 92 or a signal processing unit 94, or the display contents determined by the calculation unit 91 from the control state.

[0024] Furthermore, when it is determined that there is an abnormality in the motor, the power conversion device, the pressure detection unit, or the memory unit, or when an abnormality is detected in the control of each device that is an internal configuration of these devices, or in the communication with each device, the calculation unit 91 instructs the signal processing unit 94 to output an alarm signal. In addition, the calculation unit 91 outputs, via the signal processing unit 94, an operation signal corresponding to the current operating state, a load current value, a discharge pressure, and other status signals.

[0025] In this embodiment, the inverter (power conversion device) and the control unit are separate, but they may be configured as one component device. Also, the calculation unit and the control unit are separate, but they may be configured as one device.

[0026] The signal processing unit 94 inputs and outputs analog or digital wired or wireless signals. It processes signals input via control lines from other control panels, monitoring panels, or devices, or outputs signals via control lines. It also inputs and outputs signals via wireless communication to and from remotely installed communication devices.

[0027] FIG. 3 shows the control parameters stored in the volatile memory of the storage unit 93 each time.

[0028] The memory unit 93 has memory addresses for saving each control parameter and set values ​​(not shown) stored at those addresses. The current discharge pressure DPA detected by the discharge pressure sensor 42 is updated each time and stored at address 100. The current motor temperature value MTA is stored at address 106.

[0029] 4 and 5 show the control parameters stored in the non-volatile memory of the storage unit 93. FIG.

[0030] Address 221 stores a lower limit setting value DLL for the discharge pressure, and address 226 stores an upper limit setting value MHL for the motor temperature.

[0031] 6 shows a control flow in this embodiment. As an example, the control flow when the calculation unit 91 detects an abnormality in the motor temperature is shown.

[0032] In step 1000, the calculation unit 91 checks whether the current discharge pressure DPA is less than the pressure lower limit setting DLL. If DPA is less than DLL, the process proceeds to step 1001, where it is checked whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0033] If MTA exceeds MHL, the process proceeds to step 1002 and an abnormality signal is output. If DPA is equal to or greater than DLL in step 1000, or if MTA is equal to or less than MHL in step 1001, the process proceeds to step 1003 and no abnormality signal is output.

[0034] As mentioned above, when the water supply pressure is actually showing an abnormal trend, only the abnormality of the equipment that is the cause of the abnormality is output as an alarm signal or a failure prediction signal, which prevents excessive alarm and failure signals from being issued and makes monitoring and management easier. In this embodiment, an abnormality signal is output due to an increase in motor temperature, but a decrease in temperature can be achieved by using the motor temperature lower limit setting MLL stored in address 225 in Fig. 4 and confirming that MTA is less than MLL in step 1001. An example of an abnormally low motor temperature is shown in Fig. 7.

[0035] Not only the motor temperature, but also the load current value, communication between the control devices, the pressure detection unit, and the memory unit abnormalities can be similarly detected by comparing the respective set values ​​at addresses 227 to 232 in FIG.

[0036] An example of the case where the load current value AMA exceeds the upper limit setting value AMH is shown in Figure 8. If there is a communication abnormality between control devices, a timer TMCT for measuring the number of communication abnormalities is provided at address 109, the number of communication abnormalities that occurred while TMCT was counting is counted as CNCT at address 110, and this is stored in address 111 as the number of communication abnormalities in a certain period of time CTA for comparison.

[0037] Similarly, failures in reading and writing to the storage unit 93 can be detected using the values ​​from addresses 114 to 116. A comparison with the duration of a detection value that is determined to be abnormal may be made instead of the detection value itself. For example, in a pressure detector, the duration of a detection value that is determined to be abnormal may be stored in address 113, and a comparison with that duration may be made.

[0038] Furthermore, it is possible to check not only for a drop in discharge pressure, but also for abnormal increases, and for drops or increases in inflow pressure. In this case, it is possible to carry out a comparison in step 1000 using the DPA at address 100 in Fig. 3 or the SPA at address 103 with the set values ​​at addresses 211 to 216 in Fig. 4. An example of an abnormal rise in discharge pressure is shown in Fig. 9.

[0039] By setting the judgment value for the drop in discharge side pressure itself as the allowable pressure lower limit LMDL at address 241 in Fig. 5 and separating it from the pressure lower limit setting DLL in this embodiment, it is possible to detect an abnormality in the drop in discharge side pressure itself. Of course, LMDL and DLL may be the same value. Similarly, by separating the settings of addresses 242 to 252 from the settings of addresses 222 to 232, it is possible to output signals separately for obvious and serious fault conditions of each device. An example of detecting an abnormality in the drop in discharge side pressure itself is shown in Fig. 10. EXAMPLES

[0040] In the second embodiment of the present invention, an abnormality signal is output when the state quantities of each device, such as a pump, an electric motor, a power conversion device, a pressure detection unit, and a memory unit, exceed the allowable range to a greater extent than the values ​​stored as the state quantities at the time of the previous abnormality, i.e., when the state of the device has deteriorated.

[0041] The overall configuration diagram of the water supply device and the detailed configuration diagram of the control device are the same as those in the first embodiment, so the explanation will be omitted.

[0042] In the memory unit 93, parameters are preset at addresses 101, 106, 221, and 226, as in the first embodiment. In addition, in address 205, the motor temperature MTA1 is stored, which is the motor temperature when the calculation unit 91 last output an abnormal alarm indicating that the discharge pressure DPA was less than the pressure lower limit setting DLL and the motor temperature MTA exceeded the temperature upper limit setting MHL.

[0043] 11 shows a control flow in this embodiment. As an example, the control flow when the calculation unit 91 detects an abnormality in the motor temperature is shown.

[0044] In step 2000, the calculation unit checks whether the current discharge pressure DPA is less than the pressure lower limit setting DLL. If DPA is less than DLL, the process proceeds to step 2001, where it is checked whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0045] If MTA exceeds MHL, the process proceeds to step 2002, where it is confirmed whether the motor temperature MTA exceeds the previous temperature state quantity MTA1. If MTA exceeds MTA1, the process proceeds to step 2003, where MTA is set to MTA1, i.e., MTA is updated to the temperature state quantity at the time of the most recent pressure drop detection, and the process proceeds to step 2005, where an abnormality signal is output.

[0046] If DPA is equal to or greater than DLL in step 2000, if MTA is equal to or less than MHL in step 2001, or if MTA is equal to or less than MTA1 in step 2001, the process proceeds to step 2004 and no abnormality signal is output.

[0047] As mentioned above, when the water supply pressure is actually showing an abnormal trend, an alarm signal or a failure prediction signal is output only if the equipment causing the abnormality is progressing, which prevents excessive alarm and failure signal issuance and makes monitoring and management easier. Furthermore, even if the upper and lower limits are set as excessive protection during product trial run, they are automatically adjusted, simplifying the settings.

[0048] In this embodiment, the previous value is compared, but the comparison target is not limited to the previous value. For example, the previous state quantity may be stored in address 205, the state quantity before last may be stored in address 206, and multiple values ​​may be stored and compared with all of them or with the average value of them.

[0049] In this embodiment, an abnormality signal is output due to an increase in the temperature of the motor. However, similarly to the first embodiment, the output can be implemented not only for a decrease in temperature or the motor temperature, but also for abnormalities in the load current value, communication between the control devices, the pressure detection unit, and the memory unit, by using the set values ​​of addresses 207 to 216 in FIG. 4. EXAMPLES

[0050] In the third embodiment of the present invention, the time (the time interval from the time before last) when the discharge pressure detected by the pressure detection unit last time exceeded a preset pressure range is stored, and an abnormality signal is output when the time (the time interval from the previous time) when the discharge pressure detected by the pressure detection unit this time exceeded the preset pressure range is shorter than the previous time (the time interval from the time before last), i.e., when the frequency is increasing.

[0051] The overall configuration diagram of the water supply device and the detailed configuration diagram of the control device are the same as those in the first embodiment, so the explanation will be omitted.

[0052] In the memory unit 93, parameters are preset at addresses 101, 106, 221, and 226, as in the first embodiment. In addition, in address 101, the detection time (the time interval from the previous time) when the calculation unit this time output an abnormal alarm indicating an abnormal state in which the discharge pressure DPA is less than the pressure lower limit setting DLL and the motor temperature MTA exceeds the temperature upper limit setting MHL is stored as TMDL.

[0053] The detection time (the time interval from the time before last) when the calculation unit 91 last output an abnormal alarm because the discharge pressure DPA was less than the pressure lower limit setting DLL and the motor temperature MTA exceeded the temperature upper limit setting MHL is stored as TMR1 in address 253. The time may be calculated using a clock function or the like, or the value of a timer that is recorded and reset and restarted at the same time when it is determined that the motor temperature MTA exceeds the temperature upper limit setting MHL may be used.

[0054] 12 shows a control flow in this embodiment. As an example, the control flow when the calculation unit 91 detects an abnormality in the motor temperature is shown.

[0055] In step 3000, the calculation unit checks whether the current discharge pressure DPA is less than the pressure lower limit setting DLL. If DPA is less than DLL, the process proceeds to step 3001, where it is checked whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0056] If MTA exceeds MHL, proceed to step 3002 to check whether the detection time (time interval) TMDL is shorter than the previous time (time interval) TMR1. If TMDL is shorter than TMR1, proceed to step 3003 to set TMDL to TMR1, i.e., update TMDL to the shortest time interval between abnormality occurrences, proceed to step 3005, and output an abnormality signal.

[0057] If DPA is equal to or greater than DLL in step 3000, if MTA is equal to or less than MHL in step 3001, or if TMDR is longer than TMR1 in step 3001, the process proceeds to step 3004 and no abnormality signal is output.

[0058] As described above, by outputting an alarm signal or a failure prediction signal only when an actual equipment abnormality occurs and the water supply pressure tends to drop frequently, excessive issuance of alarms and failure signals is prevented, making monitoring and management easier.

[0059] In this embodiment, the previous value is compared, but the comparison target is not limited to the previous time. For example, the time of the previous time may be stored in address 253, the time before that in address 253, etc., and multiple times may be stored and compared with all of them or with the average value of them.

[0060] In this embodiment, an abnormality signal is output due to an increase in motor temperature. However, as in the first embodiment, the same applies not only to a decrease in temperature or motor temperature, but also to abnormalities in the load current value, communication between control devices, the pressure detection unit, and the memory unit, and therefore a description thereof will be omitted. EXAMPLES

[0061] In the fourth embodiment of the present invention, the previous discharge pressure detected by the pressure detection unit is stored when the previous discharge pressure exceeds a preset pressure range, and an abnormality signal is output when the discharge pressure detected by the pressure detection unit this time when the discharge pressure exceeds the preset pressure range is lower than the previous discharge pressure, i.e., when the water supply condition has deteriorated.

[0062] The overall configuration diagram of the water supply device and the detailed configuration diagram of the control device are the same as those in the first embodiment, so the explanation will be omitted.

[0063] In the memory unit 93, parameters are preset at addresses 101, 106, 221, and 226 as in the first embodiment. In addition, at address 201, the discharge pressure DPA1 is stored, which is the value when the calculation unit outputs an abnormality alarm indicating that the discharge pressure DPA is less than the pressure lower limit setting DLL and the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0064] 13 shows a control flow in this embodiment. As an example, the control flow when the calculation unit 91 detects an abnormality in the motor temperature is shown.

[0065] In step 4000, the calculation unit 91 checks whether the current discharge pressure DPA is less than the pressure lower limit setting DLL. If DPA is less than DLL, the process proceeds to step 4001, where it is checked whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0066] If MTA exceeds MHL, proceed to step 4002 and check whether the discharge pressure DPA is lower than the previous discharge pressure DPA1. If DPA is shorter than DPA1, proceed to step 4003 and output an abnormality signal. If DPA is equal to or greater than DLL in step 4000 or equal to or less than DPA1 in step 4001, proceed to step 4004 and do not output an abnormality signal. EXAMPLES

[0067] In the fifth embodiment of the present invention, an abnormality signal is output at a preset timing when the state quantity of each device exceeds the allowable range to a greater extent than the value stored as the state quantity at the time of the previous abnormality, i.e., when the state of the device has deteriorated.

[0068] The overall configuration diagram of the water supply device and the detailed configuration diagram of the control device are the same as those in the first embodiment, so the explanation will be omitted.

[0069] FIG. 3 shows the control parameters stored in the volatile memory of the storage unit 93 each time.

[0070] The current discharge pressure DPA detected by the discharge side pressure sensor is updated each time and stored in address 100. The current operating frequency FRA is stored in address 107. The current load current value AMA is stored in address .

[0071] 4 and 5 show the control parameters stored in the non-volatile memory of the storage unit 93. FIG.

[0072] The previous discharge pressure DPA1 is stored in address 201. The previous load current value AMA1 is stored in address 209, and the status check frequency CFRS is stored in address 283. The current value error tolerance AMPL is stored in address 284.

[0073] Fig. 14 shows a control flow in this embodiment. As an example, the control flow shows a case where the presence or absence of an abnormality is determined based on the load current value when the status check frequency is reached while operating at the same discharge pressure as the previous time.

[0074] In step 5000, the calculation unit 91 checks whether the current discharge pressure DPA matches the previous discharge pressure DPA1. If DPA matches DPA1, the process proceeds to step 5001, where it is checked whether the current frequency FRA matches CFRS.

[0075] If FRA matches CFRS, the process proceeds to step 5002 to check whether the current load current value AMA does not exceed the allowable error range AMPL of the current value, i.e., whether FRA is greater than the previous load current value AMA1 plus AMPL, or less than the value obtained by subtracting AMPL from AMA1.

[0076] If it exceeds the allowable range, the process proceeds to step 5003, and an abnormality signal is output. If DPA does not match DPA1 in step 5000, if FRA does not match CRS in step 5001, or if AMA does not exceed AMPL in step 5002, the process proceeds to step 5004, and an abnormality signal is not output.

[0077] When the discharge pressure of the pump is controlled based on the detection value of the discharge pressure sensor 42 (for example, constant discharge pressure control, constant estimated end pressure control), the discharge pressure is always a constant value, so step 5001 can be omitted.

[0078] It is known that if a pump has the same frequency (number of rotations, rotation speed) and the same flow rate, it will have the same pressure and the same load current value. If the load current value changes even though the flow rate and pressure are the same based on the flow rate estimated from the number of rotations, it is assumed that there is an abnormality in the equipment inside the pump, such as the impeller, and this can be detected.

[0079] Not only the load current value, but also the motor temperature, communication between the control devices, the pressure detection unit, and abnormalities in the memory unit can be similarly implemented by storing the previous value, the current value, and the error tolerance.

[0080] According to the above embodiment, in a water supply system, among events that are thought to indicate a tendency for equipment to fail, only those events that actually affect the water supply pressure are output as alarm or fault signals, making monitoring and management easier.

[0081] In addition, only when it is determined that the equipment is showing signs of malfunction, a signal is output as an alarm or malfunction, making monitoring and management easier.

[0082] In this way, in the above embodiment, the water supply apparatus can be easily monitored and managed, water outages and drops in water supply pressure can be prevented, and the water supply apparatus can be used comfortably. [Explanation of symbols]

[0083] 11 Unit 1 Pump 12 Unit 2 Pump 21 Unit 1 electric motor 22 Unit 2 electric motor 41 Inlet pressure sensor 42 Discharge side pressure sensor 51 Unit 1 inverter 52 Unit 2 inverter 61 Signal input section 62 Signal input section 71 Control device 81 Unit 1 Control Unit 82 Unit 2 Control Unit 91 Arithmetic section 92 Operation section 93 Memory section 94 Signal Processing Section 95 Display section

Claims

1. A pump, an electric motor for driving the pump; a pressure detection unit that detects a discharge pressure of the pump; A power conversion device that controls the rotation speed of the electric motor; A memory unit that stores a predetermined value used for controlling the pump; a calculation unit that determines whether there is an abnormality in at least one of the pump, the electric motor, the pressure detection unit, the power conversion device, and the storage unit; A water supply device having a signal processing unit that outputs an abnormality signal when the calculation unit determines that an abnormality exists, The storage unit is At least a preset pressure range is stored, The calculation unit is controlling the number of revolutions of the motor by a frequency at which the motor is driven, and controlling the discharge pressure of the pump so as to be driven within an allowable pressure range; The signal processing unit includes: When the discharge pressure exceeds the set pressure range, A water supply device that outputs the abnormality signal when it determines that an abnormality has occurred in at least one of the pump, the electric motor, the pressure detection unit, the power conversion device, and the memory unit.

2. The water supply device according to claim 1, The storage unit is a preset state quantity allowable range is stored for at least one state quantity of the pump, the electric motor, the power conversion device, the pressure detection unit, and the storage unit, The storage unit is the state quantity of at least one of the pump, the electric motor, the power conversion device, the pressure detection unit, and the storage unit when the discharge pressure exceeds the set pressure range is stored; When the discharge pressure exceeds the set pressure range, A water supply apparatus characterized in that, when the current state quantity exceeds the state quantity allowable range to a greater extent than the stored state quantity, the abnormality signal is output.

3. The water supply device according to claim 1, The storage unit is A time when the discharge pressure exceeds the set pressure range is stored, When the discharge pressure exceeds the set pressure range, A water supply apparatus characterized in that, when the current time is shorter than the stored time, the abnormality signal is output.

4. The water supply device according to claim 1, The storage unit includes: The discharge pressure when the discharge pressure exceeds the set pressure range is stored, A water supply apparatus characterized in that the abnormality signal is output when the degree to which the discharge pressure exceeds the allowable pressure range increases.

5. The water supply device according to claim 1, The pressure detection unit is A water supply device comprising a pressure sensor.

6. A pump, an electric motor for driving the pump; a pressure detection unit that detects a discharge pressure of the pump; A power conversion device that controls the rotation speed of the electric motor; A memory unit that stores a predetermined value used for controlling the pump; a calculation unit that determines whether there is an abnormality in at least one of the pump, the electric motor, the pressure detection unit, the power conversion device, and the storage unit; A water supply device having a signal processing unit that outputs an abnormality signal when the calculation unit determines that an abnormality exists, The calculation unit is controlling the number of revolutions of the motor by a frequency at which the motor is driven, and controlling the discharge pressure of the pump so as to be driven within an allowable pressure range; The storage unit is a preset state quantity allowable range is stored for at least one state quantity of the pump, the electric motor, the power conversion device, the pressure detection unit, and the storage unit, The storage unit is storing the state quantity at a preset timing; A water supply apparatus characterized in that, when the current state quantity exceeds the state quantity allowable range to a greater extent than the stored state quantity, the abnormality signal is output.

7. The water supply device according to claim 6, The pressure detection unit is A water supply device comprising a pressure sensor.

8. A water supply method for supplying water using a water supply device having a pump, an electric motor for driving the pump, a pressure detection unit for detecting a discharge pressure of the pump, a power conversion device for controlling a rotation speed of the electric motor, a memory unit for storing a predetermined value used for controlling the pump, and a control unit, The storage unit: At least a preset pressure range is stored, The control unit controlling the number of revolutions of the motor by a frequency at which the motor is driven, and controlling the discharge pressure of the pump so as to be driven within an allowable pressure range; When the discharge pressure exceeds the set pressure range, A water supply method which outputs the abnormality signal when an abnormality is detected in at least one of the pump, the electric motor, the pressure detection unit, the power conversion device, and the memory unit.

9. The water supply method according to claim 8, The storage unit: a preset allowable state quantity range for at least one of the state quantities of the pump, the electric motor, the power conversion device, the pressure detection unit, and the storage unit is stored; The storage unit: storing the state quantity of at least one of the pump, the electric motor, the power conversion device, the pressure detection unit, and the storage unit when the discharge pressure exceeds the set pressure range; The control unit When the discharge pressure exceeds the set pressure range, A water supply method comprising: outputting the abnormality signal when the current state quantity exceeds the state quantity tolerance range to a greater extent than the stored state quantity.

10. The water supply method according to claim 8, The storage unit: storing the time when the discharge pressure exceeds the pressure range; The control unit When the discharge pressure exceeds the set pressure range, A water supply method, comprising: outputting the abnormality signal when the current time is shorter than the stored time.

11. The water supply device according to claim 8, The storage unit: storing the discharge pressure when the discharge pressure exceeds the set pressure range; The control unit A water supply method characterized in that the abnormality signal is output when the degree to which the discharge pressure exceeds the allowable pressure range increases.

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