JP2015064222A - Power monitoring device or power monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, at a low cost, a power monitoring device or a power monitoring system capable of determining a portion consuming a large amount of electric power in a device to be monitored, or determining a device to be monitored consuming a large amount of electric power in a plurality of devices to be monitored.SOLUTION: A power monitoring device includes: a first data input part for receiving a measurement value of a first voltage supplied from a power source to a first device to be monitored; a second data input part for receiving a measurement value of a first current supplied from the power source to the first device to be monitored or a measurement value of an electric power; a third data input part for receiving a measurement value of a second current supplied to a second device to be monitored which is supplied with an electric power from a power source with a voltage same as that of the power source; and a calculation part for obtaining the power consumption of the first device to be monitored on the basis of the measurement values of the first voltage and the first current or on the basis of the measurement value of the electric power, and calculating the power consumption of the second device to be monitored on the basis of the measurement values of the first voltage and the second current.

Description

  Embodiments according to the present invention relate to a power monitoring apparatus or a power monitoring system.

  In recent years, there are many demands for monitoring the power consumption of devices such as machine tools (hereinafter also referred to as monitored devices) for energy saving or the like. However, many monitored devices do not have a power monitoring function. Therefore, in order to monitor the power consumption of an existing monitored device, it is necessary to separately attach a power meter to the monitored device.

Japanese Patent No. 2545465 Japanese Patent No. 192758

  Since power measuring instruments are expensive, installing power measuring instruments in many parts of monitored devices or installing power measuring instruments in many monitored devices leads to high costs. Therefore, the power meter is installed only in the main power source of the monitored device or the main monitored device.

  However, in this case, it is difficult to determine which part of the monitored device consumes a large amount of power or which monitored device consumes a large amount of power.

  Accordingly, the present invention has been made to solve the above-described problems, and a portion that consumes a large amount of power in a monitored device or a device that consumes a large amount of power among a plurality of monitored devices. It is to provide a power monitoring device or a power monitoring system capable of determining a monitoring device at a low cost.

  The power monitoring apparatus according to the present embodiment includes a first data input unit that receives a measurement value of a first voltage supplied from a power supply to the first monitored apparatus, and a supply from the power supply to the first monitored apparatus. A second data input unit that receives a measured value of a first current or a measured value of power, and a second current supplied to a second monitored device that receives power from a power source having a voltage equal to that of the power source. A third data input unit for receiving the measured value of the first voltage, and the first monitored device based on the measured value of the first voltage and the measured value of the first current or based on the measured value of the power And a calculation unit for calculating the power consumption of the second monitored device based on the measured value of the first voltage and the measured value of the second current.

  The first data input unit receives a measurement value of the first voltage from a voltage measuring device attached to a power supply unit of the first monitored device, and the second data input unit receives the first data input unit. The measurement value of the first current is received from a current measuring device attached to the power supply unit of the monitored device, and the third data input unit receives the current attached to the power supply unit of the second monitored device. The measurement value of the second current may be received from a measuring instrument.

  The first and second data input units respectively receive the first voltage measurement value and the power measurement value from a power meter attached to a power supply unit of the first monitored device, The third data input unit may receive the measurement value of the second current from a current measuring device attached to the power supply unit of the second monitored device.

In the power monitoring system according to the present embodiment, the measured value of the first voltage and the measured value of the first current supplied from the power source to the first monitored device, or the measured value from the power source to the first monitored device. Receiving a measured value of the supplied power and based on the measured value of the first voltage and the measured value of the first current, or based on the measured value of the power, the first monitored device A first power monitoring device for calculating the power consumption of
Receiving a measurement value of the first voltage from the first power monitoring device and receiving a measurement value of a second current supplied to a second monitored device that is powered by a power source having a voltage equal to the power source; And a second power monitoring device that calculates power consumption of the second monitored device based on the measured value of the first voltage and the measured value of the second current.

  The first power monitoring device receives the measurement value of the first voltage and the measurement value of the first current from a voltage measurement device and a current measurement device attached to a power supply unit of the first monitored device. The second power monitoring device may receive the measurement value of the second current from a current measuring device attached to a power supply unit of the second monitored device.

  The first power monitoring device receives the measurement value of the first voltage and the measurement value of the power from a power measuring device attached to a power supply unit of the first monitored device, and the second power monitoring device The apparatus may receive the measurement value of the second current from a current measuring device attached to the power supply unit of the second monitored apparatus.

  A power monitoring apparatus according to another embodiment includes a first data input unit that receives a measurement value of a first voltage supplied from a power source to a first part of the monitored device, and a first data input unit that receives the measured value of the monitored device from the power source. A second data input for receiving a first current measurement or power measurement supplied to the first part and a second part of the monitored device receiving power from a power source having a voltage equal to the power source A third data input for receiving a measured value of the second current supplied to the power supply, based on the measured value of the first voltage and the measured value of the first current, or measured value of the power An arithmetic unit that calculates power consumption of the first part based on the first voltage and calculates power consumption of the second part based on the measured value of the first voltage and the measured value of the second current And.

A power monitoring system according to another embodiment includes a measured value of a first voltage and a measured value of a first current supplied from a power source to a first part of a monitored device, or the first part from the power source. A measurement value of the power supplied to the first portion and based on the measurement value of the first voltage and the measurement value of the first current, or based on the measurement value of the power A first power monitoring device for calculating power consumption;
Measuring a second current supplied to a second portion of the monitored device that receives the measured value of the first voltage from the first power monitoring device and receives power from a power source having a voltage equal to the power source. A second power monitoring device that receives the value and calculates the power consumption of the second portion based on the measured value of the first voltage and the measured value of the second current.

  The power monitoring apparatus according to the present embodiment includes a voltage data input unit that receives a measurement value of a first voltage that is commonly supplied from a common power source to a plurality of monitored devices, and a supply from the common power source to the plurality of monitored devices. A plurality of current / power data input units for receiving each measured current value or each measured power value, a first measured voltage value, and a measured current value of each of the monitored devices; Or a calculation unit that calculates the power consumption of each of the plurality of monitored devices based on the measured value of the first voltage and the measured value of the power of each of the plurality of monitored devices. I have.

1 is an external view showing an example of a power monitoring apparatus 100 according to a first embodiment. The block diagram which shows an example of a structure of the power monitoring apparatus 100 according to 1st Embodiment. The figure which shows an example of the connection relation of the electric power monitoring apparatus 100 by 1st Embodiment, and the to-be-monitored apparatuses 200-1 to 200-3. The figure which shows an example of the connection relation of the power monitoring apparatus 100 by the modification of 1st Embodiment, and the to-be-monitored apparatuses 200-1 to 200-3. The figure which shows an example of the connection relation of the electric power monitoring apparatus 100-1 to 100-3 by 2nd Embodiment, and the to-be-monitored apparatus 200-1 to 200-3. The figure which shows an example of the connection relation of the electric power monitoring apparatus 100-1 to 100-3 by the modification of 2nd Embodiment, and the to-be-monitored apparatus 200-1 to 200-3.

  Embodiments according to the present invention will be described below with reference to the drawings. This embodiment does not limit the present invention.

(First embodiment)
FIG. 1 is an external view showing an example of a power monitoring apparatus 100 according to the first embodiment. The power monitoring apparatus 100 is connected to the monitored apparatus in order to record the power consumption of the monitored apparatus (see reference numeral 200 in FIGS. 3 and 4) such as a machine tool or an injection molding machine.

  The power monitoring apparatus 100 includes a housing 1, a power supply 2, a memory card slot 3, a data input unit 20, a status signal input unit 30, and a display 51. As shown in FIG. 2, a PLC (Programmable Logic Controller) 10 and the like are accommodated in the housing 1. The power monitoring apparatus 100 operates by receiving power supply from the power supply 2. The memory card slot 3 is configured so that, for example, a memory card such as an SD card can be inserted. The data input unit 20 receives the power value and the like of the monitored device from the monitored device. The status signal input unit 30 receives a status signal indicating the status of the monitored device. The status signal will be described later. The display 51 displays the power consumption of the monitored device.

  Although not shown in FIG. 1, the power monitoring apparatus 100 further includes a LAN (Local Area Network) port so that it can be connected to an external device such as a personal computer (hereinafter also simply referred to as a PC). Also good. Thereby, a plurality of power monitoring devices 100 may be connected to a host system (not shown) in a communicable manner, and the plurality of power monitoring devices 100 may be centrally managed in the host system.

  FIG. 2 is a block diagram showing an example of the configuration of the power monitoring apparatus 100 according to the first embodiment. The power monitoring apparatus 100 includes a PLC 10 as an arithmetic processing unit, a data input unit 20, a state signal input unit 30, an external output unit 40, a display output unit 50, a memory 60, and a PC input / output unit 70. I have.

  The PLC 10 executes a sequence program stored in the memory 60, and thereby automatically controls each component of the power monitoring apparatus 10 in sequence. The sequence program is stored in the memory 60. When the PLC 10 executes the sequence program, the PLC 10 starts or stops recording of the power value consumed by the monitored device. The user can rewrite the sequence program in the memory 60 in order to set conditions for starting or stopping recording of the power value. At that time, the user rewrites the sequence program by operating an external PC (Personal Computer) connected to the PC input / output unit 70.

  The sequence program includes a start condition and a stop condition for recording the power value. The PLC 10 starts recording the power value of the monitored device when the start condition of the sequence program is satisfied, and stops recording the power value of the monitored device when the stop condition is satisfied. Note that the arithmetic processing unit may be configured by a general-purpose CPU (Central Processing Unit) and a program instead of the PLC 10 and the sequence program.

  As described above, the data input unit 20 receives a monitoring value such as power data of the monitored device. For example, the monitored value is a value such as power consumed by the monitored device, voltage applied to the monitored device, current supplied to the monitored device, temperature or pressure of the monitored device. More specifically, the data input unit 20 includes a power data input unit 21, an analog data input unit 22, a voltage data input unit 23, a first current data input unit 24, and a second current data input unit 25. And a third current data input unit 26.

  The power data input unit 21 receives a measurement value (hereinafter, power value) of power consumed by the monitored device. The power value can be obtained from a power meter attached to the monitored device. The power value is a value that can be calculated based on the voltage value and the current value. Therefore, the data input unit 20 may receive one or both of a voltage value and a current value, or a power value. When the data input unit 20 receives the power value, the PLC 10 can record the power value as it is or display the power value on the display 51 as it is. On the other hand, the PLC 10 may calculate the power value from the voltage value and the current value. In this case, the PLC 10 can record not only the power value but also the voltage value and the current value, or can display them on the display 51. Therefore, the power monitoring apparatus 100 according to the present embodiment includes a voltage data input unit 23 and first to third current data input units in addition to the power data input unit 21.

  The voltage data input unit 23 receives a measured value (hereinafter, voltage value) of a power supply voltage that supplies power to the monitored device. The voltage value can be obtained from a voltage measuring device attached to the monitored device.

  The first to third current data input units 24 to 26 receive measured values (hereinafter, current values) of currents supplied to the monitored devices, respectively. The current value can be obtained from a current measuring device attached to the monitored device. In the present embodiment, the power monitoring apparatus 100 includes three current data input units 24-26. The first to third current data input units 24 to 26 include a plurality of monitored devices or a plurality of current measuring devices arranged in a plurality of parts (hereinafter also referred to as measurement portions) of a certain monitored device. Each receives a current value. Thereby, the PLC 10 can calculate each power of a plurality of monitored devices or each power of a plurality of measurement parts.

  The number of current data input units is not particularly limited. Therefore, two current data input units may be provided, or four or more current data input units may be provided. The power monitoring device 100 can receive the current value of the monitored device or the measurement portion equal to or less than the number of current data input units. The power calculation for a plurality of monitored devices or a plurality of measurement parts will be described in detail later.

  The analog data input unit 22 receives analog data such as temperature data of a processing unit of a machine tool and a band heater of an injection molding machine, flow rate data of coolant and oil, and data of mold clamping force of the injection molding machine. In this way, the data input unit 20 inputs not only power data, but also voltage data and current data, as well as other analog data as a monitoring value.

  The monitoring value may be stored in the internal memory 11 of the PLC 10. Alternatively, the monitoring value may be stored in an external memory inserted in the memory card slot 3. By using the external memory, the monitoring value data can be extracted from the power monitoring apparatus 100 without connecting an external PC to the power monitoring apparatus 100. Hereinafter, the description will be continued with the monitoring target as the power value.

  The status signal input unit 30 receives a status signal indicating the status of the monitored device. The status signal is a signal that serves as a trigger for the power monitoring apparatus 100 to start or stop monitoring the power of the monitored apparatus. For example, when the monitored device is a machine tool or an injection molding machine, the status signal is an I / O signal input / output from a sequencer (PLC) on the machine tool or injection molding machine side. More specifically, the status signal may be a signal indicating an on state or an off state of a machine tool or an injection molding machine. The state signal may be a signal indicating a state in which the machine tool or the injection molding machine has started processing (processing start signal) or a signal indicating a state in which processing is stopped (processing stop signal). The status signal may be a signal indicating the start or stop of rotation of a specific motor of the machine tool or the injection molding machine. Further, the status signal may be an on / off signal of a limit switch that is output when the operating part of the machine tool or the injection molding machine moves to a predetermined position. The status signal may be an emergency stop signal of the monitored device.

  When the monitored apparatus is operated by the machining program and the CPU, the status signal may be a sequence number indicating each machining step of a predetermined machining program in the machine tool or the injection molding machine. When the machine tool or the injection molding machine is operated by the sequence program and the PLC, the status signal may be switching information (on / off) in ladder logic or ladder language. Further, the status signal may be a signal that informs of a malfunction or failure.

  These status signals are normally output from a control unit such as a PLC built in a monitored device such as a machine tool or an injection molding machine, and can be easily extracted.

  When the status signal satisfies a predetermined condition, the power monitoring apparatus 100 starts monitoring the power and analog data of the monitored apparatus, or when these status signals no longer satisfy the predetermined condition. Stop monitoring power and analog data.

  The external output unit 40 outputs a signal to the monitored device according to the power value. For example, when the power value exceeds a predetermined value, the external output unit 40 may output a signal for stopping the operation of the monitored device. The external output unit 40 may output the power value to the external PC. The external output unit 40 is communicatively connected to a monitored device or an external PC by, for example, a wired LAN or a wireless LAN.

  The display output unit 50 outputs the power value of the monitored device to the display 51. The display 51 displays the power value of the monitored device with a numerical value or a graph. Thereby, the user can easily grasp the power consumption of the monitored apparatus.

  FIG. 3 is a diagram illustrating an example of a connection relationship between the power monitoring apparatus 100 and the monitored apparatuses 200-1 to 200-3 according to the first embodiment. In the present embodiment, the power monitoring apparatus 100 calculates the power consumption of each of the three monitored apparatuses 200-1 to 200-3. The monitored devices 200-1 to 200-3 are, for example, machines such as machine tools or injection molding machines that operate by receiving power supply from a power source. The number of monitored devices is not particularly limited as long as it does not exceed the number of current data input units provided in the power monitoring device 100.

  Current measuring devices CT1 to CT3 are attached to the monitored devices 200-1 to 200-3, respectively. In the present embodiment, the current measuring devices CT1 to CT3 are attached to the power supply units of the monitored devices 200-1 to 200-3, respectively, and the current value I1 supplied to the monitored devices 200-1 to 200-3. ~ I3 is measured periodically. The current measuring devices CT1 to CT3 transmit the measured current values I1 to I3 to the first to third current data input units 24 to 26, respectively.

  Moreover, the voltage measuring device VM is attached to the monitored apparatus 200-1. In the present embodiment, the voltage measuring device VM is attached only to the power supply unit of the monitored device 200-1, and periodically measures the voltage V1 applied to the monitored device 200-1. The voltage measuring device VM transmits the measured voltage value V1 to the voltage data input unit 23. On the other hand, the voltage measuring device VM is not attached to the monitored devices 200-2 and 200-3. Therefore, in this embodiment, voltage measurement is performed only in the monitored apparatus 200-1.

  Generally, when a plurality of monitored devices such as machine tools or injection molding machines are installed, the plurality of monitored devices are often supplied with power from a power source having the same voltage. When such a machine tool or an injection molding machine is used as a monitored device, the monitored devices 200-1 to 200-3 receive an equal voltage from the power source.

  Therefore, in this embodiment, the voltage measuring device VM is attached only to the monitored device 200-1, and the voltage measuring device VM measures only the voltage value V1 of the power supply of the monitored device 200-1. When the power monitoring apparatus 100 receives the voltage value V1 from the monitored apparatus 200-1, the power monitoring apparatus 100 not only uses the voltage value V1 for power calculation of the monitored apparatus 200-1, but also uses the voltage value V1 for the other monitored apparatuses 200-2 and 200-. 3 is also used for calculating the power. Since the monitored devices 200-1 to 200-3 receive the same power supply voltage, the voltage V1 may be used for the monitored devices 200-2 and 200-3. That is, the power monitoring apparatus 100 can accurately calculate the power values of the monitored apparatuses 200-1 to 200-3 using the power supply voltage V1 of the monitored apparatus 200-1.

  The PLC 10 calculates the power consumption of the first monitored device 200-1 based on the voltage value V1 and the current value I1. For example, the PLC 10 calculates the power consumption of the first monitored device 200-1 by multiplying the voltage value V1 and the current value I1. The PLC 10 calculates the power consumption of the second monitored device 200-2 based on the voltage value V1 and the current value I2. For example, the PLC 10 calculates the power consumption of the second monitored device 200-2 by multiplying the voltage value V1 and the current value I2. Further, the PLC 10 calculates the power consumption of the third monitored device 200-3 based on the voltage value V1 and the current value I3. For example, the PLC 10 calculates the power consumption of the third monitored apparatus 200-3 by multiplying the voltage value V1 and the current value I3. Thus, the power monitoring apparatus 100 according to the present embodiment shares the voltage value V1 from the single monitored apparatus 200-1 with the current values I1 to I3 of the multiple monitored apparatuses 200-1 to 200-3. By applying, it is possible to calculate the respective power values of the plurality of monitored devices 200-1 to 200-3.

  According to the present embodiment, only one voltage measuring device VM needs to be arranged for the plurality of monitored devices 200-1 to 200-3, and for the plurality of monitored devices 200-1 to 200-3. Commonly used. Therefore, it is not necessary to provide the voltage measuring device VM for each of the monitored devices 200-1 to 200-3. Since the single voltage measuring device VM can be shared by the plurality of monitored devices 200-1 to 200-3, the power monitoring device 100 uses the power of the plurality of monitored devices 200-1 to 200-3. Values can be calculated and recorded at low cost.

  Furthermore, the power monitoring apparatus 100 according to the present embodiment does not require a power measuring device, and uses the voltage measuring device VM and the current measuring devices CT1 to CT3 to determine the power values of the plurality of monitored devices 200-1 to 200-3. Can be calculated. In general, power meters are very expensive compared to voltage and current meters. Therefore, the power monitoring apparatus 100 according to the present embodiment can calculate and record the power values of the plurality of monitored apparatuses 200-1 to 200-3 at a lower cost.

  Thereby, if the power monitoring apparatus 100 according to the present embodiment is used, the user can easily determine a monitored apparatus that consumes a large amount of power among the monitored apparatuses 200-1 to 200-3 at low cost. Can do.

  The power monitoring apparatus 100 may input a status signal from each of the monitored apparatuses 200-1 to 200-3. As a result, recording of monitoring values such as voltage values, current values, analog data, etc. can be started or stopped for each monitored device.

(Modification of the first embodiment)
FIG. 4 is a diagram illustrating an example of a connection relationship between the power monitoring apparatus 100 and the monitored apparatuses 200-1 to 200-3 according to a modification of the first embodiment. The present modification is different from the first embodiment in that a power measuring device PM is attached to the monitored device 200-1 instead of the voltage measuring device VM and the current measuring device CT1. Usually, the power meter PM outputs a voltage value together with a power value. Therefore, the power meter PM outputs not only the power value P1 consumed by the monitored device 200-1, but also the voltage value V1 of the power source of the monitored device 200-1. The power monitoring apparatus 100 receives the power value P1 and the voltage value V1 from the power measuring instrument PM at the power data input unit 21 and the voltage data input unit 23.

  The power monitoring apparatus 100 may use the power value measured by the power meter PM as it is for the power value of the monitored apparatus 200-1. Further, the power monitoring apparatus 100 uses the voltage values V1 measured by the power measuring device PM and the current values I2 and I3 measured by the current measuring devices CT2 and CT3 for the power values of the monitored devices 200-2 and 200-3. And using Thereby, in this modification, one electric power measuring device PM is attached only to the monitored device 200-1, and the voltage value V1 from the electric power measuring device PM is common to the plurality of monitored devices 200-1 to 200-3. Can be used.

  As described above, the power meter PM is more expensive than the voltage meter and the current meter. However, in this modification, only one power meter PM needs to be arranged for the plurality of monitored devices 200-1 to 200-3, and the power measuring device PM is used for the plurality of monitored devices 200-1 to 200-3. Commonly used. Therefore, it is not necessary to provide the power measuring device PM for each of the monitored devices 200-1 to 200-3. As a result, the power monitoring apparatus 100 can calculate and record the power values of the plurality of monitored apparatuses 200-1 to 200-3 at low cost.

(Second Embodiment)
FIG. 5 is a diagram illustrating an example of a connection relationship between the power monitoring apparatuses 100-1 to 100-3 (power monitoring system) and the monitored apparatuses 200-1 to 200-3 according to the second embodiment. In the second embodiment, three power monitoring devices 100-1 to 100-3 are provided corresponding to each of the three monitored devices 200-1 to 200-3, and the monitored devices 200-1 to 200-1 are provided. Each power consumption of 200-3 is calculated. Each of power monitoring apparatuses 100-1 to 100-3 may have the same configuration as that of power monitoring apparatus 100 shown in FIG. However, in the second embodiment, the power monitoring devices 100-1 to 100-3 are provided corresponding to the monitored devices 200-1 to 200-3, respectively. Therefore, each of the power monitoring devices 100-1 to 100-3 only needs to have one current data input unit. For example, the power monitoring devices 100-1 to 100-3 may include the current data input unit 24 and omit the current data input units 25 and 26. Further, the number of power monitoring devices and the number of monitored devices are not particularly limited. Furthermore, in the second embodiment, it is assumed that the monitored devices 200-1 to 200-3 receive an equal voltage from the power source.

  Current measuring devices CT1 to CT3 are attached to the monitored devices 200-1 to 200-3, respectively. In the second embodiment, the current measuring devices CT1 to CT3 are attached to the power supply units of the monitored devices 200-1 to 200-3, respectively, and the current supplied to the monitored devices 200-1 to 200-3. The values I1 to I3 are measured periodically. The current measuring devices CT1 to CT3 transmit the measured current values I1 to I3 to the current data input units 24 of the power monitoring devices 100-1 to 100-3, respectively.

  Moreover, the voltage measuring device VM is attached to the monitored apparatus 200-1. The voltage measuring device VM is attached only to the power supply unit of the monitored device 200-1, and periodically measures the voltage V1 applied to the monitored device 200-1. The voltage measuring device VM transmits the measured voltage value V1 to the voltage data input unit 23 of the power monitoring apparatus 100-1. On the other hand, the voltage measuring device VM is not attached to the monitored devices 200-2 and 200-3. Therefore, also in the second embodiment, voltage measurement is performed only in the monitored apparatus 200-1.

  In the second embodiment, the voltage measuring device VM is attached only to the monitored device 200-1, and the voltage measuring device VM measures only the voltage value V1 of the power supply of the monitored device 200-1. The power monitoring apparatus 100-1 receives the voltage value V1 of the monitored apparatus 200-1 at the voltage data input unit 23. Furthermore, the power monitoring apparatus 100-1 transmits the voltage value V1 to the other power monitoring apparatuses 100-2 and 100-3 via the communication line L.

  The power monitoring apparatus 100-1 is communicably connected to the power monitoring apparatuses 100-2 and 100-3 via a communication line L. The communication line L may be any communication line such as a LAN (Local Area Network) or the Internet.

  The voltage data input unit 23 of the power monitoring devices 100-2 and 100-3 receives the voltage value V1 via the communication line L. Thereby, the power monitoring apparatuses 100-2 and 100-3 can use the voltage V1 measured by the voltage measuring device VM for power calculation of the monitored apparatuses 200-2 and 200-3. Since the monitored devices 200-1 to 200-3 receive the same power supply voltage, the voltage V1 may be used for the monitored devices 200-2 and 200-3. That is, the power monitoring devices 100-1 to 100-3 can accurately calculate the power values of the monitored devices 200-1 to 200-3 using the voltage value V1 of the monitored device 200-1. it can.

  The PLC 10 of the power monitoring apparatus 100-1 calculates the power consumption of the first monitored apparatus 200-1 based on the voltage value V1 and the current value I1. For example, the PLC 10 of the power monitoring apparatus 100-1 calculates the power consumption of the first monitored apparatus 200-1 by multiplying the voltage value V1 and the current value I1. The PLC 10 of the power monitoring apparatus 100-2 calculates the power consumption of the second monitored apparatus 200-2 based on the voltage value V1 and the current value I2. For example, the PLC 10 of the power monitoring apparatus 100-2 calculates the power consumption of the second monitored apparatus 200-2 by multiplying the voltage value V1 and the current value I2. Furthermore, the PLC 10 of the power monitoring apparatus 100-3 calculates the power consumption of the third monitored apparatus 200-3 based on the voltage value V1 and the current value I3. For example, the PLC 10 of the power monitoring apparatus 100-3 calculates the power consumption of the third monitored apparatus 200-3 by multiplying the voltage value V1 and the current value I3. Thus, the power monitoring devices 100-1 to 100-3 according to the second embodiment apply the voltage value V1 in common to the current values I1 to I3 of the plurality of monitored devices 200-1 to 200-3. Thus, each power value of the plurality of monitored devices 200-1 to 200-3 can be calculated.

  According to the second embodiment, only one voltage measuring device VM needs to be arranged for the plurality of monitored devices 200-1 to 200-3, and the plurality of monitored devices 200-1 to 200-3. Commonly used for Moreover, the power monitoring devices 100-1 to 100-3 according to the second embodiment do not require a power measuring device. Therefore, the second embodiment can obtain the same effects as those of the first embodiment.

  The power monitoring devices 100-1 to 100-3 may input status signals from the monitored devices 200-1 to 200-3. As a result, the power monitoring apparatuses 100-1 to 100-3 start or stop recording the monitoring values such as the voltage value, the current value, and the analog data for each of the monitored apparatuses 200-1 to 200-3. be able to.

(Modification of the second embodiment)
FIG. 6 is a diagram illustrating an example of a connection relationship between the power monitoring apparatuses 100-1 to 100-3 and the monitored apparatuses 200-1 to 200-3 according to the modification of the second embodiment. This modification is a combination of the second embodiment and the modification of the first embodiment.

  This modification differs from the second embodiment in that a power measuring device PM is attached to the monitored device 200-1 instead of the voltage measuring device VM and the current measuring device CT1. Therefore, the power meter PM outputs the power value P1 consumed by the monitored device 200-1 and the voltage value V1 of the power source of the monitored device 200-1. The power monitoring apparatus 100-1 receives the power value P1 and the voltage value V1 from the power measuring instrument PM at the power data input unit 21 and the voltage data input unit 23.

  The power monitoring apparatus 100-1 may use the power value measured by the power meter PM as it is for the power value of the monitored apparatus 200-1. Furthermore, the power monitoring apparatus 100-1 uses the voltage value V1 measured by the power measuring device PM and the current value I2 measured by the current measuring devices CT2 and CT3 for the power values of the monitored devices 200-2 and 200-3. , I3. Thereby, in this modification, one power meter PM is attached only to the monitored device 200-1, and the voltage value V1 from the power meter PM is shared by the plurality of monitored devices 200-1 to 200-3. Can be used.

  In this modification, only one power meter PM needs to be arranged for the plurality of monitored devices 200-1 to 200-3, and is common to the plurality of monitored devices 200-1 to 200-3. Used for. Therefore, the modification of the second embodiment can obtain the same effect as the modification of the first embodiment.

  The first and second embodiments can be combined. For example, for some of the plurality of monitored devices 200 among the plurality of monitored devices 200, the power monitoring device 100 is provided in common as shown in FIG. As for the remaining plurality of monitored devices 200 among the plurality of monitored devices 200, a power monitoring device 100 is provided for each monitored device 200 as shown in FIG. Thus, even if the first and second embodiments are combined, the effects of the first and second embodiments are not lost.

(Power calculation for multiple parts of monitored devices)
In the first and second embodiments, the power monitoring apparatuses 100 and 100-1 to 100-3 may calculate the power values of a plurality of different parts in a certain monitored apparatus 200. For example, when a plurality of portions in the monitored device 200 are supplied with power from a power source having the same voltage, the power monitoring devices 100 and 100-1 to 100-3 calculate the power of each of the plurality of portions. May be.

  In this case, the voltage measuring device VM or the power measuring device PM is attached only to the first portion of the plurality of portions, and is not attached to the other portions (second portion, third portion). On the other hand, the current measuring device CT is attached to each part (first to third parts).

  For example, when the power monitoring apparatus 100 shown in FIG. 3 or FIG. 4 is used, the voltage data input unit 23 receives a voltage value from the voltage measuring device VM attached to the power supply unit of the first part. The current data input unit 24 receives a current value from a current measuring device CT attached to the power supply unit of the first part. Alternatively, when the power meter PM is attached to the first part, the power data input unit 21 receives a power value from the power meter PM attached to the power source part of the first part. The current data input units 25 and 26 receive current values from current measuring devices CT attached to the power supply units of the second and third parts, respectively.

  Then, the PLC 10 calculates the power consumption of the first portion based on the voltage value and current value of the first portion or based on the power value of the first portion. The PLC 10 calculates the power consumption of the second part based on the voltage value of the first part and the current value of the second part, and the voltage value of the first part and the current value of the second part. Based on the above, the power consumption of the third portion is calculated.

  For example, when using the power monitoring apparatus 100 shown in FIG. 5 or 6, the power monitoring apparatus 100-1 receives a voltage value from the voltage measuring device VM attached to the power supply unit of the first part. The power monitoring apparatus 100-1 receives a current value from a current measuring device CT attached to the power supply unit of the first part. Or when power meter PM is attached to the 1st part, power monitoring device 100-1 receives a power value from power meter PM attached to the power supply part of the 1st part. Then, the PLC 10 of the power monitoring apparatus 100-1 uses the power consumption of the first part based on the voltage value and the current value supplied to the first part or based on the power value of the first part. Is calculated.

  On the other hand, the power monitoring apparatuses 100-2 and 100-3 receive voltage values from the power monitoring apparatus 100-1. The power monitoring devices 100-2 and 100-3 receive current values from current measuring devices CT attached to the power supply units of the second and third portions, respectively. Then, the PLC 10 of the power monitoring apparatus 100-2 calculates the power consumption of the second part based on the voltage value of the first part and the current value of the second part. The PLC 10 of the power monitoring apparatus 100-3 calculates the power consumption of the third part based on the voltage value of the first part and the current value of the third part.

  As described above, the power consumption is calculated for a plurality of portions of a certain monitored apparatus 200 using any one of the power monitoring apparatus or the power monitoring system in the first and second embodiments and the modifications thereof. be able to. Even in this case, the effect of the above embodiment is not lost.

DESCRIPTION OF SYMBOLS 100 ... Power monitoring apparatus, monitored apparatus 200, 1 ... Housing, 2 ... Power supply, 3 ... Memory card slot, 10 ... PLC, 11 ... Memory, 12 ... Timer 20... Data input section 21... Power data input section 22... Analog data input section 23... Voltage data input section 24 to 26 Current data input section 30. ..Status signal input unit, 40 ... external output unit, 50 ... display output unit, 51 ... display, 60 ... memory, 70 ... PC input / output unit

Claims (9)

A first data input for receiving a measurement of a first voltage supplied from a power source to a first monitored device;
A second data input unit for receiving a first current measurement value or a power measurement value supplied from the power source to the first monitored device;
A third data input for receiving a measurement value of a second current supplied to a second monitored device that is powered by a power source having a voltage equal to the power source;
Based on the measured value of the first voltage and the measured value of the first current or based on the measured value of the power, the power consumption of the first monitored device is obtained, and the measurement of the first voltage is performed. A power monitoring device comprising: a computing unit that calculates power consumption of the second monitored device based on a value and a measured value of the second current. The first data input unit receives a measurement value of the first voltage from a voltage measuring device attached to a power supply unit of the first monitored device,
The second data input unit receives a measurement value of the first current from a current measuring device attached to a power supply unit of the first monitored device,
2. The power monitoring according to claim 1, wherein the third data input unit receives a measurement value of the second current from a current measuring device attached to a power supply unit of the second monitored device. apparatus. The first and second data input units respectively receive the measured value of the first voltage and the measured value of the power from a power meter attached to the power supply unit of the first monitored device,
2. The power monitoring according to claim 1, wherein the third data input unit receives a measurement value of the second current from a current measuring device attached to a power supply unit of the second monitored device. apparatus. A first voltage measurement value and a first current measurement value supplied from the power source to the first monitored device or a measurement value of the power supplied from the power source to the first monitored device is received. The first power consumption of the first monitored device is calculated based on the measured value of the first voltage and the measured value of the first current, or based on the measured value of the power. A power monitoring device;
Receiving a measurement value of the first voltage from the first power monitoring device and receiving a measurement value of a second current supplied to a second monitored device that is powered by a power source having a voltage equal to the power source; A power monitoring system comprising: a second power monitoring device that calculates power consumption of the second monitored device based on the measured value of the first voltage and the measured value of the second current. The first power monitoring device receives the measurement value of the first voltage and the measurement value of the first current from a voltage measurement device and a current measurement device attached to a power supply unit of the first monitored device. ,
5. The power monitoring according to claim 4, wherein the second power monitoring device receives a measurement value of the second current from a current measuring device attached to a power supply unit of the second monitored device. system. The first power monitoring device receives the measurement value of the first voltage and the measurement value of the power from a power measuring device attached to a power supply unit of the first monitored device;
5. The power monitoring according to claim 4, wherein the second power monitoring device receives a measurement value of the second current from a current measuring device attached to a power supply unit of the second monitored device. system. A first data input for receiving a measurement of a first voltage supplied from a power source to a first part of the monitored device;
A second data input for receiving a first current measurement or power measurement supplied from the power source to a first portion of the monitored device;
A third data input for receiving a measurement value of a second current supplied to a second portion of the monitored device that is powered by a power source having a voltage equal to the power source;
Based on the measured value of the first voltage and the measured value of the first current, or based on the measured value of the power, the power consumption of the first part is calculated, and the first voltage is calculated. A power monitoring apparatus comprising: an arithmetic unit that calculates power consumption of the second portion based on the measured value of the second current and the measured value of the second current. Receiving a measurement value of a first voltage and a measurement value of a first current supplied from a power source to a first part of the monitored device, or a measurement value of a power supplied from the power supply to the first part; First power monitoring for calculating power consumption of the first portion based on the measured value of the first voltage and the measured value of the first current or based on the measured value of the power Equipment,
Measuring a second current supplied to a second portion of the monitored device that receives the measured value of the first voltage from the first power monitoring device and receives power from a power source having a voltage equal to the power source. A power monitoring system comprising: a second power monitoring device that receives a value and calculates power consumption of the second portion based on the measured value of the first voltage and the measured value of the second current. A voltage data input unit for receiving a measurement value of a first voltage commonly supplied from a common power source to a plurality of monitored devices;
A plurality of current / power data input units for receiving a measurement value of each current or a measurement value of each power supplied from the common power source to the plurality of monitored devices;
Based on the measured value of the first voltage and the measured value of the current of each of the plurality of monitored devices, or the measured value of the first voltage and the measured power of each of the plurality of monitored devices A power monitoring device comprising: an arithmetic unit that calculates power consumption of each of the plurality of monitored devices based on a value.

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