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 actually affects a water supply pressure, thereby facilitating monitoring and management.SOLUTION: When a discharge pressure does not exceed an allowable pressure range, an abnormal signal is not output.SELECTED DRAWING: Figure 4

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] Patent Publication No. 2021-183817 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, and checking each one takes time, which can result in delays in noticing important alarm and failure signals.

[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] A water supply device according to one embodiment of the present invention comprises 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 rotation speed of the electric motor, a memory unit for storing predetermined values ​​used in 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 memory unit, and a signal processing unit for outputting an abnormality signal when the calculation unit determines that there is an abnormality, wherein the memory unit stores at least an allowable pressure range for the discharge pressure, the calculation unit controls the rotation speed of the electric motor according to a frequency at which the electric motor is driven so as to drive the electric motor so that the discharge pressure is within the allowable pressure range, and the signal processing unit: When the discharge pressure does not exceed the allowable pressure range, the abnormality signal is not output. 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 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. [Figure 3A] FIG. 1 is a diagram showing a configuration of a storage unit in Examples 1 to 5. [Figure 3B] FIG. 1 is a diagram showing a configuration of a storage unit in Examples 1 to 5. [Figure 4] FIG. 2 is a diagram showing a control flow in the first embodiment. [Diagram 5] FIG. 11 is a diagram showing a control flow in the second embodiment. [Figure 6] FIG. 11 is a diagram showing a control flow in the case where the allowable pressure range is divided into two or more types in the third embodiment. [Figure 7] FIG. 11 is a diagram showing a process flow for making a judgment based on a different judgment value for each alarm rank in the third embodiment. [Figure 8] FIG. 13 is a diagram showing a flow of a process for changing an alarm rank in the fourth embodiment. [Figure 9] FIG. 13 is a diagram showing a flow of a process for changing an alarm rank in the fourth embodiment. [Figure 10] FIG. 23 is a diagram showing a process flow for changing the allowable pressure range in the sixth 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 not to output an abnormality signal unless the discharge pressure of the pump exceeds a preset allowable pressure range.

[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 the No. 1 electric motor 21 and the 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 a 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, etc. 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.

[0018] Although not shown, a pressure tank may be installed in the discharge pipe to suppress sudden fluctuations in the water supply pressure and to lengthen the interval between pump stops during automatic operation. Discharge side gate valves 34 are installed between the discharge pipe and each pump to stop the flow of water to the water supply system when the water supply system is being maintained.

[0019] Furthermore, check valves 31 and 32 are provided between the discharge gate valve and each pump to prevent water sent by one pump from flowing back through the other pump. A discharge pressure sensor 42 is provided on this discharge pipe to detect the pressure of the water main. The discharge 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 pressure sensor.

[0020] The control device 71 is shaped like a control panel, for example. 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, each receive power from a power source (not shown) and drive the motors by varying the rotation speed by changing the frequency of the output voltage. The signal input unit 1 takes in a pressure signal detected by an inlet pressure sensor. Similarly, the signal input unit 2 takes in a pressure signal detected by a discharge 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 turns on / off the output voltage of the inverter it controls and changes the frequency according to instructions from the calculation unit 91. The calculation unit 91 displays on the display unit 95 the display contents requested by the operation unit 92 or the 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 status signals such as an operation signal according to the current operating state, a load current value, and a discharge pressure via the signal processing unit.

[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. 3A shows the control parameters stored each time in the volatile memory of the storage unit 93. Fig. 3B shows the control parameters stored in the non-volatile memory of the storage unit 93.

[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 is updated each time and stored at address 100. The allowable pressure lower limit value LL is stored at address 102, and the allowable pressure upper limit value HL is stored at address 104.

[0029] 4 shows a control flow in this embodiment. As an example, the control flow when the calculation unit 91 detects an abnormality in communication with each device in the control device 71 is shown.

[0030] If the calculation unit does not detect an abnormality in communication with the devices in the control device in step 200, the process proceeds to step 204 and does not output an abnormality signal. If an abnormality in communication is detected in step 200, the process proceeds to step 201 and checks whether the current discharge pressure DPA is equal to or higher than the allowable pressure lower limit LL.

[0031] If DPA is less than LL, the process proceeds to step 203, where an abnormality signal is output. If DPA is equal to or greater than LL, the process proceeds to step 202, where it is confirmed whether the current discharge pressure DPA is equal to or less than the upper limit of the allowable pressure HL. If DPA exceeds HL, the process proceeds to step 203, where an abnormality signal is output. If DPA is less than HL, the process proceeds to step 204, where no abnormality signal is output. EXAMPLES

[0032] In the second embodiment of the present invention, an alarm rank is set for the abnormality signal, and when the discharge pressure does not exceed the allowable pressure range, it is determined whether or not to output the abnormality signal according to the alarm rank.

[0033] 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.

[0034] In the memory unit 93, parameters are set in advance at addresses 100 to 102 in the same manner as in the first embodiment. In addition, an alarm rank for a temperature abnormality of the motor is set at address 110. An alarm rank for a communication abnormality between the control device and each device is set at address 111.

[0035] An alarm rank for an output abnormality of the pressure sensor (detection unit) is set in address 112. In this embodiment, the alarms are an abnormality in communication between the motor and the control device, and an abnormality in the sensor, but it is not essential to rank these alarms, and other conditions may be treated as alarms and alarm ranks may be set.

[0036] For example, three alarm ranks, A, B, and C, are set, where A is an alarm that is issued regardless of pressure, B is an alarm that is not issued if the discharge side pressure is within the allowable pressure range, and C is an alarm that is not issued.

[0037] 5 shows a control flow in this embodiment. As an example, the control flow when the calculation unit 91 detects an abnormality in communication with each device in the control device 71 is shown.

[0038] If the calculation unit does not detect an abnormality in communication between the devices in the control device in step 300, the process proceeds to step 301 and does not output an abnormality signal. If an abnormality in communication is detected in step 300, the process proceeds to step 302 and it is confirmed whether the alarm rank for the communication abnormality between the control devices is A.

[0039] If it is A, proceed to step 303 and output an abnormality signal. If it is not A, proceed to step 304 and check whether the alarm rank of the communication abnormality between the control devices is B. If it is not B, proceed to step 305 and do not output an abnormality signal. If it is B, proceed to step 200. The control flow from step 200 onwards is the same as in the first embodiment, so a description will be omitted. EXAMPLES

[0040] In the third embodiment of the present invention, an alarm rank is set for the abnormality signal, and when the discharge pressure does not exceed the allowable pressure range, it is determined whether or not to output an abnormality signal depending on the alarm rank, and further, the allowable pressure range is changed depending on the alarm rank.

[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 second embodiment, so the explanation will be omitted.

[0042] In the memory unit 93, parameters are set in advance at addresses 100, 102, 104, 110 to 112, as in the second embodiment. In addition, an allowable pressure lower limit value (heavy) LL2 is stored in address 103, and an allowable pressure upper limit value (heavy) HL2 is stored in address 105. LL2 is a value lower than the allowable lower limit value (light) LL of address 102. Similarly, HL2 is a value higher than the shared upper limit value (light) HL of address 104.

[0043] For example, three alarm ranks, A, B, and C, are set, where A is an alarm that sounds regardless of pressure, B is an alarm that does not sound if the discharge pressure is within the allowable pressure range with a slight error range, allowing some excess of the pressure range, and C is an alarm that does not sound if the discharge pressure is within the allowable pressure range with a severe error range, allowing a large excess of the pressure range.

[0044] 6 shows a control flow in this embodiment. As an example, the control flow when the calculation unit 91 detects an abnormality in communication with each device in the control device 71 is shown.

[0045] Steps 300 to 304 are the same as in the second embodiment, and therefore their explanations will be omitted. Also, in step 304, it is confirmed whether the alarm rank of the communication abnormality between the control devices is B, and if it is B, the control flow proceeds to step 200 and thereafter, which are the same as in the first embodiment, and therefore their explanations will be omitted. If the alarm rank is not B in step 304, the process proceeds to step 401.

[0046] Steps 401 and after will be described with reference to FIG.

[0047] In step 401, it is confirmed whether the current discharge pressure DPA is equal to or greater than the allowable pressure lower limit LL2. If DPA is less than LL2, the process proceeds to step 403, where an abnormality signal is output. If DPA is equal to or greater than LL2, the process proceeds to step 402, where it is confirmed whether the current discharge pressure DPA is equal to or less than the allowable pressure upper limit HL2.

[0048] If DPA exceeds HL2, the process proceeds to step 403 and an abnormality signal is outputted, whereas if DPA is less than HL2, the process proceeds to step 404 and no abnormality signal is outputted. EXAMPLES

[0049] In the fourth embodiment of the present invention, an alarm rank is set for the abnormality signal, and when the discharge pressure does not exceed the allowable pressure range, it is determined whether or not to output an abnormality signal depending on the alarm rank, and further, the alarm rank is changed depending on a comparison of the pressure with the time of the previous alarm detection.

[0050] 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 second embodiment, so the explanation will be omitted.

[0051] In the memory unit 93, parameters are preset in addresses 100 to 102 and 110 to 112 as in the second embodiment. In addition, in the address 101, the discharge pressure detected by the discharge side pressure sensor at the time when an abnormality was detected the previous time, the pressure was confirmed as alarm rank B, and an alarm was not output because it was within the allowable pressure range is stored as DPB each time.

[0052] As an example, the control flow will be shown when the calculation unit 91 detects an abnormality in communication with each device in the control device 71. The control flow of this embodiment is the same as that of the second embodiment up to step 204, as shown in Figs. 5 and 4, and therefore will not be described here.

[0053] Step 204 and subsequent steps will be described with reference to Figure 8. In step 204, no alarm is output, and then the process proceeds to step 205, where it is confirmed whether the pressure DPA detected by the discharge side pressure sensor is less than the pressure DPB at the time of the previous abnormality detection when the pressure was within the allowable pressure range and no alarm was issued. If DPA is less than DPB, in step 206 the alarm rank for the communication abnormality is set to A (alarm rank is changed from B to A), and the process proceeds to step 207. In step 205, if DPA exceeds DPB, the process proceeds to step 207. In step 207, the pressure value detected by the discharge side pressure sensor at that time (i.e., DPA) is stored as DPB.

[0054] As another example, the control flow when the calculation unit 91 detects an abnormality in communication with each device in the control device 71 is shown. The control flow of this embodiment is the same as that of the second embodiment up to step 204, and is as shown in Figs. 5 and 4, so the description will be omitted.

[0055] Step 204 and subsequent steps will be described with reference to Fig. 9. In step 404, no alarm is output, and then the process proceeds to step 405, where it is confirmed whether the pressure DPA detected by the discharge side pressure sensor is equal to or lower than the pressure DPB at the previous time when an abnormality was detected and the pressure was within the allowable pressure range so no alarm was issued. If DPA is less than DPB, then in step 406 the alarm rank for the communication abnormality is set to B (alarm rank is changed from C to B), and the process proceeds to step 407. If in step 405 DPA exceeds DPB, the process proceeds to step 407. In step 407, the pressure value detected by the discharge side pressure sensor at that time (i.e., DPA) is stored as DPB. EXAMPLES

[0056] In the first to fourth embodiments, the detected value of the discharge pressure is compared with the allowable pressure range, but a time limit may be set for these to be checked. For example, an allowable time is set for addresses 120 to 123 shown in Fig. 3, and when the pressure value is checked and judged in step 201 or step 202, or step 401 or step 402, if the condition is not satisfied and the timer is not started, the timer is started.

[0057] The timer value is counted at addresses 124 to 127 of the volatile memory. Until the timer times out, the process proceeds to YES (does not output an alarm) in the condition. When the timer times out, the process proceeds to NO (outputs an alarm). EXAMPLES

[0058] In the first to fourth embodiments, the pressure DPA detected by the discharge side pressure sensor when the alarm is output can be stored as the allowable lower limit pressure LL and can be used as the allowable pressure range from the next time onwards. Hereinafter, this will be described as a sixth embodiment.

[0059] 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 fifth embodiment, so the explanation will be omitted.

[0060] As an example, the control flow when the calculation unit 91 detects an abnormality in communication with each device in the control device 71 is shown. The control flow of this embodiment is the same as that of the second embodiment up to step 204, as shown in Fig. 5 and Fig. 4, and therefore the description will be omitted. Step 204 and after will be described with reference to Fig. 10.

[0061] In step 204, no warning is output, and then the process proceeds to step 208, where it is confirmed whether the pressure DPA detected by the discharge side pressure sensor is less than the allowable lower limit pressure LL. If DPA is less than LL, in step 210, an abnormality signal is output, and the process proceeds to step 211.

[0062] If DPA exceeds LL in step 208, the process proceeds to step 209 and no abnormality signal is output. In step 211, the pressure value detected by the discharge side pressure sensor at that time (i.e., DPA) is stored as LL. EXAMPLES

[0063] In the third embodiment, the allowable pressure range is changed according to the alarm rank. However, the allowable pressure range may be changed according to the number of abnormalities detected by the calculation unit. EXAMPLES

[0064] In the third embodiment, the allowable pressure range is changed according to the alarm rank, and in the seventh embodiment, the allowable pressure range is changed according to the number of abnormalities detected by the calculation unit. However, rather than setting the allowable pressure range in advance, it is also possible to adjust the allowable pressure range by correcting the lower and upper limits of the allowable pressure range using the correction values ​​of addresses 130 to 131 shown in FIG. 3, for example.

[0065] This makes it easy to set multiple alarm ranks without storing a large amount of data in the memory unit 93, or to set an allowable pressure range when multiple alarms are generated simultaneously. EXAMPLES

[0066] In the fourth embodiment, the pressure value is compared with the pressure value at the time of the previous alarm output and the alarm rank is changed. However, it is also possible to change the allowable pressure range without changing the alarm rank, for example, by the correction value of addresses 130 to 131 shown in FIG. 3. EXAMPLES

[0067] In each of the above embodiments, an example of a water supply device equipped with an inverter (power conversion device) is shown, but the water supply device does not necessarily have to be equipped with an inverter, and it is also possible to implement a water supply device that controls water supply by simply starting and stopping an electric motor without controlling the rotation speed. Furthermore, the pressure detection means is not limited to a stepless analog signal from a pressure sensor, and may be a pressure switch that operates at a specific pressure value.

[0068] The water supply device of Example 10 includes pumps 11, 12, an electric motor 21 for driving the pumps, a pressure detection unit 42 for detecting the discharge pressure of the pumps 11, 12, control units 81, 82 for controlling the operation and stopping of the electric motor 21, a memory unit 93 for storing predetermined values ​​used in controlling the pumps 11, 12, a calculation unit 91 for determining whether there is an abnormality in at least one of the pumps 11, 12, the electric motor 21, the pressure detection unit 42, the control units 81, 82 and the memory unit 93, and a signal processing unit 94 for outputting an abnormality signal when the calculation unit 91 determines that there is an abnormality.

[0069] The control units 81, 82 control the motor 21 to operate when the discharge pressure of the pumps 11, 12 falls below a predetermined value, and do not output an abnormality signal unless the discharge pressure falls below a preset predetermined pressure while the motor 21 is operating. Here, the pressure detection unit is composed of, for example, a pressure switch.

[0070] According to 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]

[0071] 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 that drives 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 storing at least an allowable pressure range for the discharge pressure; 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 so as to drive the motor within the allowable pressure range; The signal processing unit includes: A water supply apparatus characterized in that the abnormality signal is not output when the discharge pressure does not exceed the allowable pressure range.

2. The water supply device according to claim 1, The storage unit is storing a plurality of alarm ranks for the abnormal signal according to the degree of importance; The signal processing unit includes: A water supply apparatus characterized in that it determines whether or not to output the abnormality signal depending on the importance of the alarm rank.

3. The water supply device according to claim 2, The calculation unit is A water supply apparatus characterized in that the importance of the alarm rank is changed when the degree to which the discharge pressure exceeds the allowable pressure range changes compared to the previous discharge pressure.

4. The water supply device according to claim 2, The storage unit is The water supply device is characterized in that the alarm ranks stored include an alarm rank for a temperature abnormality in the electric motor, an alarm rank for an output abnormality in the pressure detection unit, and an alarm rank for a state abnormality in the memory unit.

5. The water supply device according to claim 1, The calculation unit is A water supply apparatus characterized in that the allowable pressure range is changed when the degree to which the discharge pressure exceeds the allowable pressure range changes compared to the previous discharge pressure.

6. The water supply device according to claim 1, The storage unit is storing an allowable time for the discharge pressure; The signal processing unit includes: This water supply device is characterized in that even if the discharge pressure exceeds the allowable pressure range, the abnormality signal is not output if the allowable time has not been exceeded depending on the degree to which the allowable pressure range is exceeded.

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

8. A pump, an electric motor that drives the pump; a pressure detection unit that detects a discharge pressure of the pump; A control unit that controls operation and stopping 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 control unit, and the storage unit; A water supply device having a signal processing unit for outputting an abnormality signal when the calculation unit determines that an abnormality has occurred, The control unit is Controlling the motor so as to operate when the discharge pressure of the pump falls below a predetermined value; A water supply apparatus characterized in that the abnormality signal is not output unless the discharge pressure falls below a predetermined pressure during operation of the electric motor.

9. The water supply device according to claim 8, The pressure detection unit is A water supply device comprising a pressure switch.

10. 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: storing at least an allowable pressure range for the discharge pressure; The control unit 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 outputting an abnormality signal when it is determined that an abnormality exists; controlling the number of revolutions of the motor by a frequency at which the motor is driven, and controlling the discharge pressure so as to drive the motor within the allowable pressure range; A water supply method comprising the steps of: not outputting the abnormality signal when the discharge pressure does not exceed the allowable pressure range.

11. The water supply method according to claim 10, The storage unit: storing a plurality of alarm ranks for the abnormal signal according to the degree of importance; The control unit A water supply method comprising determining whether or not to output the abnormality signal depending on the importance of the alarm rank.

12. The water supply method according to claim 11, The control unit A water supply method characterized in that the importance of the alarm rank is changed when the degree to which the discharge pressure exceeds the allowable pressure range changes compared to the previous discharge pressure.

13. The water supply method according to claim 11, The storage unit: A water supply method characterized in that the alarm ranks stored include an alarm rank for a temperature abnormality in the electric motor, an alarm rank for an output abnormality in the pressure detection unit, and an alarm rank for a status abnormality in the memory unit.

14. The water supply method according to claim 10, The control unit A water supply method characterized in that the allowable pressure range is changed when the degree to which the discharge pressure exceeds the allowable pressure range has changed compared to the previous discharge pressure.

15. The water supply method according to claim 10, The storage unit: storing an allowable time for the discharge pressure; The control unit A water supply method characterized in that even if the discharge pressure exceeds the allowable pressure range, the abnormality signal is not output if the allowable time has not been exceeded depending on the degree to which the allowable pressure range is exceeded.

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