KR200454775Y1 - Monitoring unit to monitor the operation of the submersible motor pump - Google Patents

Abstract

The present invention relates to a monitoring unit for monitoring the operating state of the submersible motor pump. The monitoring unit for automatically monitoring the operating state of the submersible motor pump according to one aspect of the present invention, the submersible motor pump is a power inlet chamber for introducing a power cable, a motor with a motor supplied with power from the power inlet chamber A seal and a pump chamber for pumping the surrounding water with an impeller connected to the rotating shaft of the motor are divided into seals, and the winding temperature sensor in the motor chamber respectively installed around the three-phase winding of the motor, to support the rotating shaft A bearing temperature sensor in the motor compartment respectively installed around the load bearing and the half-load bearing, or a leakage sensor respectively installed in the motor compartment and the power inlet chamber, wherein the winding temperature sensor, the bearing temperature sensor, or the leak sensor Receiving unit for receiving a detection signal from the; A user interface for setting an alarm generation threshold for the winding temperature sensor, the bearing temperature sensor, or the leak sensor; And store the alarm generation threshold in a memory, store the detection signal in the memory at predetermined time intervals, and generate an alarm signal when the magnitude of the detection signal is greater than a corresponding alarm generation threshold stored in the memory. And a controller configured to control the display of alarm information by dividing each sensor on the included display device.

Description

Monitoring Unit for Monitoring Operation State of Underwater Motor Pump

The present invention relates to a monitoring unit, and more particularly, to a monitoring unit for monitoring the operating state of the submersible motor pump.

The submersible motor pump pumps the water so that the water filled in the reservoir is kept below a certain height in a sewage treatment plant, a pressurization station for running water supply, a rural pumping station, a drainage station, and a household sewer.

In order to monitor the operation state of such a submersible motor pump, conventionally, the alarm display device of the power supply switchgear was merely a degree to know the on / off state of the power supply or the operation state of the motor.

Therefore, there is a need for a device for automatically monitoring various operating conditions that cause the failure of the underwater motor pump.

Therefore, the present invention is to solve the above-described problems, the object of the present invention, to automatically monitor the various operating conditions of the underwater motor pump to prevent the occurrence of the failure in advance and to monitor so that it can be replaced immediately in case of failure. To provide a monitoring unit that can be.

First, to summarize the features of the present invention, the monitoring unit for automatically monitoring the operating state of the underwater motor pump according to one aspect of the present invention for achieving the object of the present invention as described above, the submersible motor pump, power cable A power inlet chamber for introducing power, a motor chamber in which a motor receives power from the power inlet chamber, and a pump chamber for pumping water around the impeller connected to a rotating shaft of the motor. The seal is isolated so as to prevent leakage, and the winding temperature sensor in the motor chamber respectively installed around the three-phase winding of the motor, the bearing temperature sensor in the motor chamber respectively installed around the load bearing and the half load bearing supporting the rotating shaft. Or leaking sensors respectively installed in the motor compartment and the power inlet compartment, and the winding temperature. A receiver configured to receive a detection signal from a sensor, the bearing temperature sensor, or the leak sensor; A user interface for setting an alarm generation threshold for the winding temperature sensor, the bearing temperature sensor, or the leak sensor; And store the alarm generation threshold in a memory, store the detection signal in the memory at predetermined time intervals, and generate an alarm signal when the magnitude of the detection signal is greater than a corresponding alarm generation threshold stored in the memory. And a controller configured to control the display of alarm information by dividing each sensor on the included display device.

The user interface sets an alarm generation threshold for the load current of each of the three-phase windings, and the controller measures the load current of each of the three-phase windings and stores them in the memory at predetermined time intervals, and the magnitude of the load current. Is greater than or equal to the corresponding alarm occurrence threshold stored in the memory, generates an alarm signal and controls the alarm information to be displayed by dividing each winding on the display device included in the user interface. Each alarm generation threshold time for the winding temperature sensor, each alarm generation threshold time for the two bearing temperature sensors, or alarm generation threshold time for the two leak sensors, is stored in the memory, and the winding temperature Sensor, the bearing temperature sensor, or the leak sensor If the size of the detection signal held for the alarm threshold over time as the alarm threshold value or more, and controls so as to notify an external power supply cut off the power supplied to the motor.

The controller stores a plurality of alarm generation threshold times corresponding to an alarm generation threshold value for the winding temperature sensor, the bearing temperature sensor, or the leak sensor in the memory, and a plurality of alarm generation threshold times corresponding to the corresponding alarm generation threshold values. The power supply may be notified to cut off the power supplied to the motor while the magnitude of the detection signal of the corresponding sensor maintains the alarm generation threshold or more.

The control unit may have a cavitation warning threshold for each of the three winding temperature sensors input through the user interface, a cavitation warning threshold for two bearing temperature sensors, or a cavitation warning for two leak sensors. When the threshold value is stored in the memory, and the sensing signal of the sensor is less than the alarm generation threshold, the motor may be maintained when the threshold value of the cavitation warning threshold is maintained for the second alarm generation threshold time corresponding to the alarm generation threshold. The power supply may be notified to cut off the power supply.

The display means of the user interface may display a history of the detection signal stored in the memory as a text or a graph in a predetermined menu.

The control unit transmits the history of the detection signal stored in the memory to a server of an external central center through a communication unit connected through a network, so that the user terminal connected to the server via a network can query the history of the detection signal Can be controlled.

According to the monitoring unit according to the present invention, it is possible to automatically monitor the various operating conditions of the submersible motor pump to prevent the occurrence of the failure in advance, and to immediately replace and replace in case of failure.

1 is a view for explaining a monitoring system according to an embodiment of the present invention.
2 is a view for explaining the structure of the underwater motor pump according to an embodiment of the present invention.
3 is a block diagram of a monitoring unit according to an embodiment of the present invention.
4 is an example of a main screen view of a user interface according to an embodiment of the present invention.
5 is an example of an operation history view of a user interface according to an embodiment of the present invention.
6 is an example of a trend view of a user interface according to an embodiment of the present invention.
7 is a view for explaining the situation of alarm generation according to an embodiment of the present invention.
8 is a view for explaining the situation of the alarm occurrence in the cavitation operating state according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments.

1 is a view for explaining a monitoring system according to an embodiment of the present invention.

Monitoring system according to an embodiment of the present invention, the sewage treatment plant, pressurized water supply for water supply, rural pumping station, drainage, or sewage in the home to maintain the water filled in the reservoir to a certain height or less drainage treatment In order to achieve this, a plurality of submersible motor pumps may be installed in water, such as a water tank, and each submersible motor pump is connected to a corresponding monitoring unit and several strands of communication cables according to the present invention, so that various kinds of submersible motor pumps may be connected to the monitoring unit. The operating status (overheating, leaks, etc.) can be monitored automatically.

Each submersible motor pump is supplied with power through a power supply such as a distribution board to operate the internal motor. The power supply unit is submerged in the motor according to a signal that is generated due to overheating or leaking of the submersible motor pump in the monitoring unit. It is also possible to cut off the power supply to the motor pump.

In addition, the monitoring units connected to each submersible motor pump can be connected to the server of the central center through a network such as wired / wireless internet and mobile communication network, and the server of the central center manages and stores various information such as history information transmitted from the monitoring units. Thus, a user or an operator can query the history information transmitted from the monitoring units by connecting to a server of the central center through a network through a computer, a mobile communication terminal, or the like.

Here, a terminal of a user or an operator who can access a server of a central center through a network may be a notebook PC, a desktop PC, a Palm PC, a smartphone, a cellular phone, or a PCS phone. Personal Communications Services phone), synchronous / asynchronous international mobile Telecommunication-2000 (IMT-2000), personal digital assistant (PDA), wireless application protocol phone (WAP phone), mobile game machine (mobile) It may be a play-station, a portable multimedia player (PMP), or the like, or various electronic devices or devices throughout a home or business society that can communicate with other electronic devices.

2 is a view for explaining the structure of the underwater motor pump 10 according to an embodiment of the present invention.

2, the submersible motor pump 10 according to an embodiment of the present invention, a power inlet chamber for introducing a power cable, a motor chamber with a motor supplied with power from the power inlet chamber, and the motor It includes a pump chamber for pumping the surrounding water with an impeller (or propeller) connected to the rotating shaft of. The power inlet chamber, motor compartment, and pump compartment are divided. When water is submerged in the pump compartment through the water inlet or rotated by the impeller, the water from the outside or the pump compartment is transferred to the motor compartment and the power outlet compartment. In order to prevent leakage of water, the power supply chamber and the motor chamber are surrounded by a cover, and the pump chamber and the motor chamber and between the motor chamber and the power chamber are sealed with predetermined sealing materials, respectively. That is, except for cables or rotating shafts extending from the pump chamber to the motor chamber and between the motor chamber and the power inlet chamber, the sealing material is sealed with a resin material such as resin. This is prevented from entering, and the power supply room and the motor room are isolated to prevent leakage.

In the present invention, in order to automatically monitor whether the operation of the submersible motor pump 10 is properly performed, the temperature sensor or the leak in the power inlet and the motor compartment of the submersible motor pump 10 as described above. (Or humidity) sensing sensor was installed.

In order to supply power to the motor, the submersible motor pump 10 is connected to an external power supply, and the power cable connected to the power supply uses an underwater power cable that is waterproof even when the submersible motor pump 10 is locked in water. The power cable introduced into the power inlet chamber, and the power cable introduced into the power inlet chamber supplies power to a predetermined control circuit and supplies power to the motor of the pump room. The control circuit of the power inlet chamber receives a signal from the water level sensor installed at a predetermined position outside the submersible motor pump 10 and supplies power to the motor of the pump chamber when the water level is higher than a certain height so that the rotation shaft of the motor rotates and is mounted at the end of the rotation shaft. The impeller can be rotated to allow the water to be pumped. In addition, the control circuit of the power inlet chamber may receive a signal from a water level sensor installed at another position outside the submersible motor pump 10 and may be in a standby state so that power is not supplied to the motor of the pump chamber when the height of the water is lower than a predetermined height. .

In this way, the three-phase power is supplied to the motor of the motor compartment powered by the power inlet chamber to rotate the rotating shaft of the motor, and the water is pumped by rotating the impeller mounted at the end of the rotating shaft extending to the pump chamber. The three-phase winding (R, S, T) of the motor receiving the constant current flows during the operation of the motor and may cause overheating due to high current due to overload or short circuit, etc., so that the monitoring unit 100 (FIG. 1 / FIG. Winding temperature sensors 21, 22, and 23 are provided around each of the three-phase windings R, S, and T in close proximity to the motor in the motor compartment so that they can be monitored by the motor. The winding temperature sensors 21, 22, and 23 may generate an electrical signal corresponding to the ambient temperature and transmit the electrical signal to the monitoring unit 100 connected by a predetermined communication cable.

In addition, the rotating shaft of the motor is supported and rotated by the load bearing 31 and the half-load bearing 32 in the motor compartment, so that the monitoring unit 100 (Fig. 1) may be overheated due to lack of lubricant or leakage or overload Bearing temperature sensors 41 and 42 are provided around each of the load bearing 31 and the half-load bearing 32 in the motor compartment so that it can be monitored by (see FIG. 3). The bearing temperature sensors 41 and 42 may generate an electrical signal corresponding to the ambient temperature and transmit the electrical signal to the monitoring unit 100 connected by a predetermined communication cable.

In addition, between the power supply room and the motor room and between the motor room and the power supply room, each is sealed with a predetermined sealing material, but holes are formed due to the wear of the sealing material, and the pump room or external water flows into the motor room or the power supply room. This may cause damage to the load bearing 31 and the half-load bearing 32 or short circuit of the power supply compartment, as well as damage to the motor. Bearing leakage sensors 51 and 52 are respectively installed at predetermined positions in the power entry chamber so as to be monitored. The lower leak sensor 51 may be installed as close to the pump chamber as possible, and the upper leak sensor 52 may be installed as close to the motor chamber as possible. The lower leak sensor 51 and the upper leak sensor 52 may generate an electrical signal corresponding to the ambient humidity and transmit the generated electrical signal to the monitoring unit 100 connected by a predetermined communication cable.

3 is a block diagram of a monitoring unit 100 according to an embodiment of the present invention.

Referring to FIG. 3, the monitoring unit 100 according to an embodiment of the present invention includes a control unit 110, a memory 111, a sensor signal receiving unit 120, a communication unit 130, and a user interface 140. Include.

The controller 110 collectively controls each unit of the monitoring unit 100 and may be configured to include other components, and the memory 111 may include information or sensors for various environment settings under the control of the controller 110. A history of various sensor signals received by the signal receiver 120 may be stored.

The communication unit 130 may communicate with an external power supply device (see FIG. 1) by a serial communication method according to a standard such as RS232, and may also communicate with a server of a central center through a network based on Ethernet (or Internet). To help. In addition, in some cases, the communication unit 130 may support short-range wireless communication (Zigbee, Bluetooth, etc.), wireless Internet communication, mobile communication, etc. in order to communicate with the server of the central center through a power supply or a network.

The user interface 140 shows a menu as shown in FIGS. 4 to 6 through display means such as an LCD (Liquid Crystal Display) and an LED (Light Emitting Diode), and requires a user such as operation history, trends, environment settings, and help. It supports various settings and allows you to inquire history. The selection shown in the above menu may be selected by using a predetermined button or a touch panel.

The user selects an environment setting from a menu displayed through the user interface 140, so that each of the winding temperature sensors 21, 22, 23, bearing temperature sensors 41, 42, and leak sensors 51, 52 can be The alarm generation threshold and the cavitation warning threshold (less than the alarm generation threshold), the alarm generation threshold and the cavitation warning threshold (less than the alarm generation threshold) for each load current of the three-phase winding of the motor can be set, the control unit 110 Such information may be stored in the memory 111.

In addition, the user selects an environment setting from a menu displayed through the user interface 140, so that each alarm occurrence threshold time for the three winding temperature sensors 21, 22, and 23, and two bearing temperature sensors 41, Each alarm generation threshold time for 42), each alarm generation threshold time for the two leak sensors 51 and 52, and an alarm generation threshold time for the load current of each of the three-phase windings of the motor can be set, and the control unit 110 may store such information in the memory 111. The user's setting may be reset at any time according to the characteristics of each sensor, and the controller 110 may update and store the reset information in the memory 111 when the reset information is input.

The sensor signal receiver 120 receives a sensing signal sensed and transmitted by three winding temperature sensors 21, 22, and 23, two bearing temperature sensors 41 and 42, and two leak sensors 51 and 52, respectively. do.

The controller 110 stores the detection signal of each sensor received by the sensor signal receiver 120 in the memory 111 at predetermined time intervals. The controller 110 may include a predetermined timer, and store the detection signal of each sensor received by the sensor signal receiver 120 in the memory 111 for each time of a predetermined period of the corresponding date. In addition, the controller 110 measures the load current of each of the three-phase windings of the motor and stores the load current in the memory 111 for each predetermined period of time.

The control unit 110, based on the detection signal from the winding temperature sensors 21, 22, 23 in addition to the load current, the accumulated operating time of each winding of the motor in the main screen as shown in Figure 4 through the display means of the user interface 140 The temperature of each winding, the temperature of each bearing based on the detection signals from the bearing temperature sensors 41 and 42, the leakage state (humidity) of each power entry chamber or the pump room based on the detection signals from the leak sensors 51 and 52, etc. Can be controlled to display. In addition, as shown in FIG. 5, when the operation history is selected from the menu of the display means of the user interface 140 by the user, the control unit 110 based on the history of the load current stored in the memory 111 or the detection signal of each sensor. The history of the detection signal may be displayed in text, and as shown in FIG. 6, the trend may be controlled to be displayed in a graph. The history of the sensed signal is based on the temperature of each winding based on the sensed signal from the winding temperature sensors 21, 22, 23 and the angle based on the sensed signal from the bearing temperature sensors 41, 42, corresponding to the corresponding sensed signal reception time. It may be a leak state (humidity) of each of the power entry chamber or the pump chamber based on the temperature of the bearing or the detection signals from the leak sensors 51 and 52.

In particular, the controller 110 generates an alarm signal when the magnitude of the detection signal received by the sensor signal receiver 120 (or the load current of each winding of the motor) is equal to or greater than a corresponding alarm occurrence threshold stored in the memory 111. Each sensor (or winding) may be classified on a display device (display means) included in 140 to control the alarm information to be displayed. For example, a red display or lamp may smoky through a predetermined window or predetermined LED of the LCD.

As shown in FIG. 4, the alarm generation threshold for the winding temperature sensors 21, 22, 23 may be 110 degrees Celsius, with the temperature of each winding based on sensed signals from the winding temperature sensors 21, 22, 23 exceeding this. The controller 110 may control the alarm information to be displayed through the LCD or LED as described above. Also, the alarm occurrence threshold for the bearing temperature sensors 41 and 42 may be 90 degrees Celsius, and if the temperature of each bearing based on the detection signal from the bearing temperature sensors 41 and 42 exceeds this, the controller 110 may As above, the alarm information can be displayed through LCD or LED. In addition, the alarm occurrence threshold for the leak sensors 51 and 52 may be 75%, and if the leak state (humidity) of each of the power entry chamber or the pump chamber based on the detection signal from the leak sensors 51 and 52 exceeds this, The controller 110 may control the alarm information to be displayed through the LCD or LED as described above.

As illustrated in FIG. 7, when the temperature or humidity (or load current of each winding of the motor) of each winding based on a detection signal of each sensor exceeds the preset alarm occurrence threshold, the controller 110 may turn off the LCD or LED. You can control the alarm information to be displayed. At this time, the sludge or the like is temporarily introduced into the impeller, causing an overload, a temporary abnormality in the power supply, or other temporary environmental changes. It may happen that the alarm generation threshold set for each sensor is exceeded. In this case, alarm information may be displayed temporarily, but it is not necessary to cut off the power supplied to the motor. Therefore, in response to an environment change such as temporary overload, the operation for controlling the interruption of the power supplied to the motor is not performed.

However, the user selects an environment setting from a menu displayed through the user interface 140, so that each alarm occurrence threshold time for the load current of each winding of the motor, three winding temperature sensors 21, 22, 23 Each alarm occurrence threshold time for each of the two alarms, the respective alarm generation threshold time for the two bearing temperature sensors (41, 42), each alarm generation threshold time for the two leakage sensors (51, 52) can be set, the control unit 110 may store such information in the memory 111.

Accordingly, the control unit 110 controls the magnitude of each sensing signal from the winding temperature sensors 21, 22, 23, the bearing temperature sensors 41, 42, and the leak sensors 51, 52 (or the respective windings of the motor). Load current) is maintained for more than the corresponding alarm generation threshold time stored in the memory 111 above the corresponding alarm generation threshold value (see FIG. 7), an external device via the communication unit 130 to cut off the power supplied to the motor. The power supply can be notified. When the external power supply such as the switchboard receives the corresponding notification (signal), the power supply to the underwater motor pump 10 may be cut off to prevent the motor from operating anymore.

Alternatively, the alarm occurrence threshold and the alarm generation threshold time for the load current of each winding of the motor, the winding temperature sensors 21, 22, 23, the bearing temperature sensors 41, 42, and the leak sensors 51, 52, respectively. It may be set to a plurality of and stored in the memory 111, in this case, the control unit 110 is the magnitude of the detection signal of the sensor (or load of each winding of the motor) for more than the alarm generation threshold time corresponding to each alarm generation threshold value When the current is maintained above the alarm occurrence threshold, an external power supply can be notified to cut off the power supply to the motor. For example, the alarm occurrence threshold for the bearing temperature sensor 41 and the corresponding alarm occurrence threshold time are 10 minutes at 70 degrees Celsius or higher, 8 minutes between 70 degrees and 80 degrees Celsius, and 80 degrees or higher and 90 degrees Celsius. 5 minutes, 90 degrees Celsius or more may be set to 1 minute, so that the controller 110 is based on the magnitude of the detection signal of the bearing temperature sensor 41 (converted) at a temperature of 70 degrees When not exceeding 10 minutes, the power supply is not notified to the power supply. However, when the bearing temperature is 90 degrees Celsius, the power supply can be notified immediately after the minute. This method may be similarly applied to each of the load current of each winding of the motor, the winding temperature sensors 21, 22, 23, the bearing temperature sensors 41, 42, and the leak sensors 51, 52.

In addition, the controller 110 may control the cavitation due to the cavitation caused by the change of the flow of water around the pump chamber, the case where there is little water, and the like. For example, through the user interface 140, the load current of each winding of the motor, three winding temperature sensors 21, 22, 23, two bearing temperature sensors 41, 42, two leak sensors 51, 52) In addition to the alarm generation threshold and the alarm generation threshold for each, the cavitation warning threshold and the second alarm generation threshold for each may be input by the user and stored in the memory 111. As such, even when the magnitude (or load current of each winding of the motor) of the corresponding sensor is less than the corresponding alarm occurrence threshold for the second alarm generation threshold time corresponding to each alarm generation threshold or more, the above cavitation warning threshold or more. In order to cut off the power supplied to the motor, the message can be notified to the power supply. For example, each cavitation warning threshold may be set slightly higher than the magnitude of each detection signal or the level of the load current of each winding of the motor under normal conditions without overload or cavitation, and less than each alarm occurrence threshold. Accordingly, the controller 110 may determine that the cavitation is generated even if the alarm generation threshold is lower than the alarm generation threshold, and the user or the operator checks the pump even when such cavitation occurs. Can be prepared for dispatch to the site for replacement or replacement. Here, the second alarm generation threshold time for the cavitation may be set to the same time as the alarm generation threshold time of the normal state, but the second alarm generation threshold time is a general alarm generation because the cavitation warning threshold is lower than the alarm generation threshold. It is also possible to set a time longer than the threshold time (for example, 2 seconds, etc.) (for example, 4 seconds, etc.) so that power-off notification by cavitation is not frequently generated.

In addition, the history of the detection signal generated based on the detection signal of each sensor stored in the memory 111 by the controller 110 as described above, the history of the load current of each winding of the motor, etc. Appropriate intervals such as minutes, seconds, etc.) can be sent over the network to a server in the central center. Accordingly, the user or operator terminal connected to the server of the central center through the network such as the Internet, the history of the detection signal, the history of the load current, that is, the signal of each sensor as a history of the operation state of the submersible motor pump 10, etc. You can inquire the history, history of load current, etc. As shown in FIG. 5, a user or operator terminal connected to a server of a central center through a network such as the Internet may display a history of a detection signal (or load current) of each sensor provided by the server of the central center in text. As shown in FIG. 6, a trend may be inquired based on information provided to be displayed in a graph. In the event of overload or cavitation, the user or operator can be dispatched to the site to check or replace the pump.

Although the present invention has been described with reference to the limited embodiments and drawings, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the utility model registration claims as described below and equivalents to the utility model registration claims.

21, 22, 23: 3-phase winding temperature sensor
31: load bearing
32: Half load bearing
41: load bearing temperature sensor
42: Half load bearing temperature sensor
51: lower leakage sensor
52: upper leak sensor

Claims (7)

In the monitoring unit for automatically monitoring the operating state of the submersible motor pump, the submersible motor pump includes a power inlet chamber for introducing a power cable, a motor compartment in which a motor supplied with power is supplied from the power inlet chamber, and the motor. It is divided into a pump chamber for pumping the surrounding water with an impeller connected to the rotating shaft of the power supply chamber and the motor chamber is isolated to prevent leakage, winding temperature sensor in the motor chamber respectively installed around the three-phase winding of the motor A bearing temperature sensor in the motor chamber respectively installed around the load bearing and the half load bearing supporting the rotating shaft, or a leakage sensor respectively installed in the motor chamber and the power inlet chamber,
A receiver configured to receive a detection signal from the winding temperature sensor, the bearing temperature sensor, or the leak sensor; A user interface for setting an alarm generation threshold for the winding temperature sensor, the bearing temperature sensor, or the leak sensor; And store the alarm generation threshold in a memory, store the detection signal in the memory at predetermined time intervals, and generate an alarm signal when the magnitude of the detection signal is greater than a corresponding alarm generation threshold stored in the memory. It includes a control unit for controlling the display of alarm information by classifying each sensor on the included display device,
The control unit may generate each alarm generation threshold time for the three winding temperature sensors input through the user interface, each alarm generation threshold time for the two bearing temperature sensors, or alarm generation for the two leak sensors. When the threshold time is stored in the memory and the magnitude of the detection signal from the winding temperature sensor, the bearing temperature sensor, or the leak sensor is maintained for more than the corresponding alarm generation threshold or more for the above alarm generation threshold time, an external power supply is provided. Notify the device to cut off the power supplied to the motor, wherein the control unit generates a different alarm corresponding to a plurality of alarm occurrence thresholds for the winding temperature sensor, the bearing temperature sensor, or the leak sensor When the threshold time is stored in the memory, the detection of the sensor When the magnitude of the signal is maintained for each alarm generation threshold or more for the corresponding alarm generation threshold or more, the power supply is notified to control the power supply to the motor to be cut off.
The control unit may include a cavitation warning threshold and a second alarm generation threshold for each of the three winding temperature sensors input through the user interface, and a cavitation warning threshold and a second alarm generation threshold for the two bearing temperature sensors. The cavitation warning threshold and the second alarm occurrence threshold time for the two or two leak sensors are stored in the memory, and the detection signal of the sensor is greater than the cavitation warning threshold even if the magnitude of the detected signal is less than the alarm occurrence threshold. Notify the power supply device to cut off the power supplied to the motor when the signal is maintained for more than the second alarm occurrence threshold time,
And displaying the history of the detection signal stored in the memory in a text or graph in a predetermined menu through the display means of the user interface. The method of claim 1,
The user interface sets an alarm generation threshold for the load current of each of the three phase windings,
The controller measures the load current of each of the three-phase windings and stores the load current in the memory at predetermined time intervals, and generates an alarm signal in the user interface when the load current is greater than or equal to a corresponding alarm generation threshold stored in the memory. The monitoring unit, characterized in that for controlling the display of alarm information by distinguishing each winding on the display device. delete delete delete delete The method of claim 1,
The control unit transmits the history of the detection signal stored in the memory to a server of an external central center through a communication unit connected through a network, so that the user terminal connected to the server via a network can query the history of the detection signal Monitoring unit, characterized in that.

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