Water supply equipment 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 apparatus and a water supply method.

Background Art

[0002] In a water supply apparatus, water outage is a situation that must be avoided. For this reason, alarms and failure signals are issued in response to malfunctions or failures of devices constituting the water supply apparatus, to notify facility managers, persons in charge of device service management companies and the like, and countermeasures are taken before water outage occurs. As a technology related to this, for example, there is Patent Document 1.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the pump system described in Patent Document 1, it is stated that water leakage can be detected from the relationship between a change in pressure on the secondary side of the pump and the driving of the motor.

[0005] However, device alarms and failure signals are not necessarily events that lead to water outage. Depending on the alarm level setting, frequent alarm issuing increases the labor for checking the device status.

[0006] Furthermore, with the development of facility monitoring technology, centralized remote monitoring and management has become possible. On the contrary, when monitoring remotely, target alarms and failure signals from various locations are received, which means time is required to check each signal, and there is a risk that detection of important alarms and failure signals is delayed.

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

[0008] The objective of this invention is to facilitate monitoring and management of a water supply system by outputting alarm / fault signals only for events that actually affect the water supply pressure, among events that are considered to be signs of equipment failure. [Means for solving the problem]

[0009] A water supply device according to one aspect of the present invention includes a pump, an electric motor for driving the pump, a pressure detection unit for detecting the discharge pressure of the pump, a power conversion device for controlling the rotational speed of the electric motor, a storage unit for storing predetermined values ​​used for controlling the pump, a calculation unit for determining an abnormality in at least one of the pump, the electric motor, the pressure detection unit, the power conversion device, and the storage unit, and a signal processing unit for outputting an abnormality signal when the calculation unit determines that there is an abnormality, wherein the storage unit stores at least a preset pressure range, the calculation unit controls the rotational speed of the electric motor based on the frequency for driving the electric motor, and controls the pump so that the discharge pressure is driven within an allowable pressure range, and the signal processing unit outputs the abnormality signal when the discharge pressure exceeds the preset pressure range and the signal processing unit determines that 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. [Effects of the Invention]

[0010] According to one aspect of the present invention, in a water supply system, among events that are thought to be signs of equipment failure, only those events that actually affect the water supply pressure are output as alarm / fault signals, making monitoring and management easier. [Brief explanation of the drawing]

[0011] [Figure 1] This diagram shows the configuration of the water supply system in Examples 1 to 5. [Figure 2] This diagram shows the configuration of the control devices in Examples 1 to 5. [Figure 3] This figure shows the configuration of the volatile memory in the storage unit in Examples 1 to 5. [Figure 4]FIG. 1 is a diagram illustrating a part of a configuration of a nonvolatile memory in a storage unit according to Examples 1 to 5. [Figure 5] FIG. 1 is a diagram illustrating a part of a configuration of a nonvolatile memory in a storage unit according to Examples 1 to 5. [Figure 6] FIG. 2 is a diagram illustrating a control flow according to Example 1. [Figure 7] FIG. 2 is a diagram illustrating a control flow according to Example 1. [Figure 8] FIG. 2 is a diagram illustrating a control flow according to Example 1. [Figure 9] FIG. 2 is a diagram illustrating a control flow according to Example 1. [Figure 10] FIG. 2 is a diagram illustrating a control flow according to Example 1. [Figure 11] FIG. 3 is a diagram illustrating a control flow according to Example 2. [Figure 12] FIG. 4 is a diagram illustrating a control flow according to Example 3. [Figure 13] FIG. 5 is a diagram illustrating a control flow according to Example 4. [Figure 14] FIG. 6 is a diagram illustrating a control flow according to Example 5. DESCRIPTION OF EMBODIMENTS

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

[0013] The present invention is configured to output an abnormality signal when a discharge pressure of a pump exceeds a preset pressure range and when one or more abnormalities are recognized in any one or more of a pump, an electric motor, a power converter, a pressure detection unit, and a storage unit.

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

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

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

[0017] On the demand side, the discharge pipe 36 is connected to the demand-side water supply pipe in the case of a direct-delivery system, supplying water to, for example, faucets in apartment buildings. In the case of a raised water tank system, this discharge pipe is connected to the demand-side water supply pipe to supply water to the raised water tank. Although not shown in the diagram, a pressure tank may be installed in the discharge pipe to suppress sudden fluctuations in water supply pressure and to lengthen the pump stop interval during automatic operation.

[0018] Between the discharge pipe and each pump, a discharge-side gate valve 34 is installed to stop the flow of water to the water supply system during maintenance. Furthermore, between the discharge-side gate valve and each pump, a check valve 31 for pump 1 and a check valve 32 for pump 2 are installed to prevent water supplied by one pump from flowing back through the other pump. A discharge-side pressure sensor 42 is installed in this discharge pipe to detect the pressure of the main water pipe. Based on the value detected by the discharge-side pressure sensor 42, the discharge-side pressure of the pump is controlled (for example, constant discharge pressure control, constant estimated terminal pressure control).

[0019] The control device 71 is, for example, in the shape of a control panel. The internal components of the control device, the No. 1 inverter (power converter for the No. 1 motor) 51 and the No. 2 inverter (power converter for the No. 2 motor) 52, each receive power from the power supply side (not shown) and drive the motors by changing the frequency of the output voltage, thereby changing the rotational speed of each motor.

[0020] Signal input section 61The system acquires the pressure signal detected by the inlet pressure sensor 41. Similarly, the signal input section 62 The system acquires the pressure signal detected by the discharge-side pressure sensor 42.

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

[0022] The calculation unit 91 determines the operation method of each motor according to the control parameters stored in the memory unit 93, according to the instructions input from the operation unit 92, or according to the signals input from the signal processing unit 94, and gives instructions to the motor control unit 1 81 and motor control unit 2 82 to operate / stop the motors and change their rotational speed.

[0023] Each control unit, following the instructions of the calculation unit, switches the output voltage of the inverter it controls ON / OFF and changes its frequency. The calculation unit 91 displays the display content requested by the operation unit 92 or the signal processing unit 94, or the display content determined by the calculation unit 91 based on the control state, on the display unit 95.

[0024] Furthermore, if the system determines that there is an abnormality in the electric motor, power converter, pressure detection unit, or memory unit, or if it detects an abnormality in the control of each of these internal components or in communication with each component, it instructs the signal processing unit 94 to output an alarm signal. In addition, the calculation unit 91 outputs operation signals, load current values, discharge pressure, and other status signals corresponding to the current operating state via the signal processing unit 94.

[0025] In this embodiment, the inverter (power converter) and the control unit are separate, but they may be combined into a single component. Similarly, the calculation unit and the control unit are separate, but they may be combined into a single component.

[0026] The signal processing unit 94 handles the input and output of analog or digital wired or wireless signals. It processes signals input via control lines from other control panels, monitoring panels, or equipment, or outputs signals via control lines. Alternatively, it performs signal input and output to remotely installed communication equipment via wireless communication.

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

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

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

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

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

[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 checks whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

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

[0034] As described above, when the water supply pressure is actually showing an abnormal trend, only the malfunction of the equipment causing the abnormality is output as an alarm signal or fault prediction signal, thereby preventing the issuance of excessive alarm and fault signals and making monitoring and management easier. In this embodiment, an abnormal signal output due to a rise in motor temperature was shown. However, for a temperature decrease, the motor temperature lower limit setting MLL stored at address 225 in Figure 4 can be used, and the MTA can be confirmed to be less than MLL in step 1001. An example of the case of abnormally low motor temperature is shown in Figure 7.

[0035] In addition to the motor temperature, the load current value, communication between control devices, pressure detection unit, and memory unit abnormalities can also be checked in a similar manner by comparing the respective setting values ​​from addresses 227 to 232 in Figure 4 in step 1001.

[0036] The load current value AMA is the upper limit. setting Figure 8 shows an example where the AMH is exceeded. If there is a communication error between control devices, a timer TMCT is set at address 109 to measure the number of communication errors, the number of communication errors that occurred while the TMCT was counting is counted at address 110 as CNCT, and this is stored at address 111 as the number of communication errors over a certain period of time CTA, and can be compared.

[0037] Similarly, read and write failures in the memory unit 93 can be detected using the values ​​from addresses 114 to 116. Instead of comparing the detected value itself, a comparison can be made with the duration of the detected value that is deemed abnormal. For example, in a pressure detector, the duration of the detected value that is deemed abnormal can be stored at address 113, and a comparison can be made with that duration.

[0038] Furthermore, it is possible to check not only for a decrease in discharge pressure, but also for abnormal increases, decreases or increases in inflow pressure, and other abnormalities. In this case, the DPA at address 100 or SPA at address 103 in Figure 3 is used, and the respective setting values ​​at addresses 211 to 216 in Figure 4 are used for comparison in step 1000. An example of an abnormal increase in discharge pressure is shown in Figure 9.

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

[0040] Embodiment 2 of the present invention outputs an abnormal signal when the state values ​​of each device, such as a pump, electric motor, power converter, pressure detection unit, and memory unit, exceed the acceptable range to a greater extent than the value stored as the state value during the previous abnormality, i.e., when the condition of the device has deteriorated.

[0041] The overall configuration diagram of the water supply system and the detailed configuration diagram of the control device are the same as in Example 1, so their explanation will be omitted.

[0042] Similar to Embodiment 1, parameters are pre-set in the memory unit 93 at addresses 101, 106, 221, and 226. In addition, address 205 stores the motor temperature as MTA1 from the previous time when the calculation unit 91 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.

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

[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 checks whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0045] If MTA exceeds MHL, proceed to step 2002 to check if the motor temperature MTA exceeds the previous temperature state variable MTA1. If MTA exceeds MTA1, proceed to step 2003 to set MTA to MTA1, that is, update MTA to the temperature state variable at the time of the most recent pressure drop detection, proceed to step 2005, and output an abnormal signal.

[0046] If DPA is DLL or higher in step 2000, or if MTA is MHL or lower in step 2001, or if MTA is MTA1 or lower in step 2001, proceed to step 2004 and do not output an abnormal signal.

[0047] As described above, by outputting an alarm signal or fault prediction signal only when the water supply pressure is actually showing an abnormal trend and the equipment causing the abnormality is progressing, excessive alarm and fault signals are prevented, making monitoring and management easier. Furthermore, even if excessive upper and lower limit settings are made as protection during product commissioning, the system will be automatically adjusted, simplifying the settings process.

[0048] In this example, we compared the values ​​to the previous values, but the comparison is not limited to the previous values. For example, the previous state value could be stored at address 205 and the state value from two values ​​prior at address 206, and multiple values ​​could be stored, and the comparison could be made with all of them, or with their average value.

[0049] In this embodiment, an abnormal signal output due to a rise in motor temperature was shown. However, similar to Embodiment 1, this can also be implemented for temperature drops, or not limited to motor temperature, but also for abnormalities in load current value, communication between control devices, pressure detection unit, and memory unit, using the respective setting values ​​from addresses 207 to 216 in Figure 4. [Examples]

[0050] Embodiment 3 of the present invention stores the time (time interval since the time before last) when the discharge pressure detected by the pressure detection unit in the previous instance exceeded a preset pressure range, and outputs an abnormal signal when the time (time interval since last time) when the discharge pressure detected by the pressure detection unit in the current instance exceeds the preset pressure range is shorter than the previous time (time interval since the time before last), i.e., when the frequency has increased.

[0051] The overall configuration diagram of the water supply system and the detailed configuration diagram of the control device are the same as in Example 1, so their explanation will be omitted.

[0052] Similar to Embodiment 1, parameters are pre-set in the memory unit 93 at addresses 101, 106, 221, and 226. In addition, address 101 stores the detection time (time interval from the previous detection) as TMDL when the calculation unit outputs an abnormal alarm indicating that the discharge pressure DPA is below the pressure lower limit setting DLL and the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0053] Address 253 stores the detection time (the time interval since the previous instance) as TMR1 when the calculation unit 91 last time outputted an abnormal alarm because the discharge pressure DPA was below the pressure lower limit setting DLL and the motor temperature MTA exceeded the temperature upper limit setting MHL. The time can be calculated from a clock function or by using the value of a timer that is reset and restarted simultaneously with recording when it is determined that the motor temperature MTA exceeds the temperature upper limit setting MHL.

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

[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 checks whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0056] If MTA exceeds MHL, proceed to step 3002 to check if 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 as TMR1, that is, update TMDL to the shortest time interval since the anomaly occurred, proceed to step 3005, and output the anomaly signal.

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

[0058] As described above, by outputting an alarm signal or fault prediction signal only when an actual equipment malfunction is occurring and the water supply pressure is showing a tendency to fluctuate frequently, excessive alarm and fault signals are prevented, making monitoring and management easier.

[0059] In this example, we compared the value to the previous value, but the comparison is not limited to the previous value. For example, you could store the time of the previous value at address 253, the time of the value before that at address 253, and so on, and then compare all of them, or their average value.

[0060] In this embodiment, an abnormal signal output due to a rise in motor temperature was demonstrated. However, as with Embodiment 1, it is self-evident that the same applies to temperature drops, or not limited to motor temperature, but also to load current values, communication between control devices, pressure detection unit, and memory unit abnormalities, so no explanation is provided. [Examples]

[0061] Embodiment 4 of the present invention stores the previous discharge pressure when the discharge pressure detected by the pressure detection unit exceeds a preset pressure range, and outputs an abnormal signal when the discharge pressure detected by the pressure detection unit this time exceeds the preset pressure range and 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 system and the detailed configuration diagram of the control device are the same as in Example 1, so their explanation will be omitted.

[0063] In the memory unit 93, parameters are pre-set at addresses 101, 106, 221, and 226, similar to the first embodiment. In addition, address 201 stores the discharge pressure as DPA1 when the calculation unit outputs an abnormal alarm because the discharge pressure DPA is below the pressure lower limit setting DLL and the motor temperature MTA exceeds the temperature upper limit setting MHL.

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

[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 checks whether the motor temperature MTA exceeds the temperature upper limit setting MHL.

[0066] If MTA exceeds MHL, proceed to step 4002, and the discharge pressure DPA is equal to the previous discharge pressure DPA1 Is it less than Confirm. DPA is DPA1 Less than If this is the case, proceed to step 4003 and output an abnormal signal. If DPA is DLL or higher in step 4000, or if DPA is DPA1 or lower in step 4001, proceed to step 4004 and do not output an abnormal signal. [Examples]

[0067] Embodiment 5 of the present invention outputs an abnormal signal at a preset timing when the state value of each device exceeds the acceptable range to a greater extent than the value stored as the state value during the previous abnormality, i.e., when the device condition has deteriorated.

[0068] The overall configuration diagram of the water supply system and the detailed configuration diagram of the control device are the same as in Example 1, so their explanation will be omitted.

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

[0070] Address 100 stores the current discharge pressure DPA detected by the discharge pressure sensor, which is updated each time. Address 107 stores the current operating frequency FRA. Address 108 stores the current load current value AMA.

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

[0072] Address 201 stores the previous discharge pressure DPA1. Address 209 stores the previous load current value AMA1, and address 283 stores the status check frequency CFRS. Address 284 stores the current value error tolerance range AMPL.

[0073] Figure 14 shows the control flow in this embodiment. As one example, it shows the control flow when the system is operating at the same discharge pressure as the previous time, and when the status check frequency is reached, the presence or absence of an abnormality is determined by the load current value.

[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 checks whether the current frequency FRA matches CFRS.

[0075] If FRA matches CFRS, proceed to step 5002 to check if the current load current value AMA exceeds the current value error tolerance range AMPL. That is, FRA is the previous load current value AMA1 plus AMPL. Ta Check if the value is greater than the given value, or less than the value obtained by subtracting AMPL from AMA1.

[0076] If the tolerance is exceeded, the process proceeds to step 5003 and an abnormal signal is output. If DPA does not match DPA1 in step 5000, or if FRA is not matched in step 5001 CFRS If this does not match, and if AMA does not exceed AMPL in step 5002, proceed to step 5004 and do not output an abnormal signal.

[0077] When controlling the discharge pressure of the pump based on the value detected by the discharge pressure sensor 42 (for example, constant discharge pressure control, constant estimated end pressure control), the discharge pressure is always a constant value, Step 5000 This can be omitted.

[0078] It is known that a pump will produce the same pressure and load current value at the same frequency (rotational speed) and flow rate. If the load current value changes despite the same flow rate and pressure, it is presumed that there is a malfunction in the pump's internal components, such as the impeller, and this can be detected.

[0079] This can be done similarly not only for load current values, but also for motor temperature, communication between control devices, pressure detection unit, and memory unit abnormalities, by storing the previous value, the current value, and the allowable error range.

[0080] According to the above embodiment, in a water supply system, among events that are thought to be signs of equipment failure, only those events that actually affect the water supply pressure are output as alarm / fault signals, making monitoring and management easier.

[0081] Furthermore, by outputting an alarm or fault signal only when the device is deemed to be prone to failure, monitoring and management can be made easier.

[0082] As described above, the water supply system can be easily monitored and managed, preventing water outages and drops in water pressure, and enabling comfortable use of the water supply system. [Explanation of Symbols]

[0083] 11 Unit 1 Pump Pump No. 12-2 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 Unit 95 Display section

Claims

1. Pump and The electric motor that drives the pump, A pressure detection unit for detecting the discharge pressure of the pump, A power converter that controls the rotational speed of the electric motor, A storage unit that stores predetermined values ​​used to control the pump, A calculation unit that determines an abnormality in at least one of the pump, the electric motor, the pressure detection unit, the power converter, and the storage unit, A water supply device comprising a signal processing unit that outputs an abnormality signal when the calculation unit determines that there is an abnormality, The aforementioned storage unit is At least remember the pre-set pressure range, The aforementioned arithmetic unit, The rotational speed of the electric motor is controlled by the frequency at which the electric motor is driven, and the discharge pressure of the pump is controlled to operate within the set pressure range. The signal processing unit, If the discharge pressure exceeds the set pressure range, and an abnormality is detected in at least one of the pump, the electric motor, the pressure detection unit, the power converter, and the storage unit, the abnormality signal is output. The aforementioned storage unit is The pump, the electric motor, the power converter, the pressure detection unit, and the storage unit each store a preset tolerance range for at least one of the state variables. The aforementioned storage unit is The system stores at least one of the state quantities of the pump, the electric motor, the power converter, the pressure detection unit, and the storage unit when the discharge pressure exceeds the set pressure range. A water supply device that outputs an abnormal signal when the discharge pressure exceeds the set pressure range and the current state quantity exceeds the allowable state quantity range to a greater extent than the stored state quantity.

2. A water supply device according to claim 1, The aforementioned storage unit is The time interval between the time before last and the time before last when the discharge pressure exceeded the set pressure range is stored. A water supply device characterized in that, when the discharge pressure exceeds the set pressure range, it outputs the abnormal signal if the time interval between the previous and current events is shorter than the time interval between the previous-previous and current events that is stored.

3. A water supply device according to claim 1, The aforementioned storage unit includes: The discharge pressure is stored when the discharge pressure exceeds the set pressure range. A water supply device characterized by outputting the abnormal signal when the discharge pressure increases to the extent that it exceeds the set pressure range.

4. Pump and The electric motor that drives the pump, A pressure detection unit for detecting the discharge pressure of the pump, A power converter that controls the rotational speed of the electric motor, A storage unit that stores predetermined values ​​used to control the pump, A calculation unit that determines an abnormality in at least one of the pump, the electric motor, the pressure detection unit, the power converter, and the storage unit, A water supply device comprising a signal processing unit that outputs an abnormality signal when the calculation unit determines that there is an abnormality, The aforementioned arithmetic unit, The rotational speed of the electric motor is controlled by the frequency at which the electric motor is driven, and the discharge pressure of the pump is controlled to operate within a set pressure range. The aforementioned storage unit is The pump, the electric motor, the power converter, the pressure detection unit, and the storage unit each store a preset tolerance range for at least one of the state variables. The aforementioned storage unit is The state quantity is stored at a predetermined timing, A water supply device characterized in that it outputs the abnormal signal when the current state quantity exceeds the allowable range of the state quantity to a greater extent than the stored state quantity.

5. 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 the discharge pressure of the pump, a power conversion device for controlling the rotational speed of the electric motor, a storage unit for storing predetermined values ​​used for controlling the pump, and a control unit, The aforementioned storage unit, At least remember the pre-set pressure range, The control unit, The rotational speed of the electric motor is controlled by the frequency at which the electric motor is driven, and the discharge pressure of the pump is controlled to operate within the set pressure range. If the discharge pressure exceeds the set pressure range, and an abnormality is detected in at least one of the pump, motor, pressure detection unit, power converter, and storage unit, an abnormality signal is output from at least one of the pump, motor, power converter, pressure detection unit, and storage unit. The aforementioned storage unit, The pump, the electric motor, the power converter, the pressure detection unit, and the storage unit each store a preset tolerance range for at least one of their state variables. The aforementioned storage unit, The pump, the electric motor, the power converter, the pressure detection unit, and the storage unit store at least one of the state quantities when the discharge pressure exceeds the set pressure range. The control unit, A water supply method that outputs an abnormal signal when the discharge pressure exceeds the set pressure range and the current state quantity exceeds the allowable state quantity range to a greater extent than the stored state quantity.

6. A water supply method according to claim 5, The aforementioned storage unit, The time interval between the time before last and the time before last when the discharge pressure exceeds the set pressure range is stored. The control unit, A water supply method characterized in that, when the discharge pressure exceeds the set pressure range, an abnormal signal is output if the time interval between the previous and current discharges is shorter than the time interval between the stored time before last and the previous discharge.

7. A water supply method according to claim 5, The aforementioned storage unit, The discharge pressure is stored when the discharge pressure exceeds the set pressure range. The control unit, A water supply method characterized by outputting the abnormal signal when the discharge pressure increases to an extent that exceeds the set pressure range.

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