KR20080071100A - Method of magnetic contactor's life prediction and motor control center of produced by this method - Google Patents

Abstract

A method for alarming a remaining lifetime of magnetic contactors and a motor control board applied by the same are provided to operate an electronic circuit having the magnetic contactors stably by allowing a user to exchange the magnetic contactors stably. A method for alarming a remaining lifetime of magnetic contactors includes the steps of: setting an electric reference value for an electric remaining lifetime calculation; measuring an electric characteristic value of a power supplying line when the magnetic contactors are converted from off to on; calculating the electric remaining lifetime of the magnetic contactors by using an electric reference value and the electric characteristic measurement value; and outputting an electric remaining lifetime of the magnetic contactors to the outside if the electric remaining lifetime of the magnetic contactors is exhausted.

Description

Warning method for exhausting remaining life of magnetic contactor and motor control panel to which such warning method is applied {Method of magnetic contactor's life prediction and motor control center of produced by this method}

The present invention relates to a method for warning a user that the remaining life of the magnetic contactor has been exhausted, and a motor control panel to which such a warning method is applied. And, it relates to a motor control panel to which such a warning method is applied.

As is well known, the magnetic contactor is a device which is operated and controlled by a control signal input from the outside, and controls the power supply on / off. The magnetic contactor is operated on the principle of electromagnet using the law of Lenz. Various things have been developed and widely used.

Since the magnetic contactor performs an important function of controlling the power supply on / off, when the magnetic contactor is damaged, power supply to various electromagnetic devices powered by the corresponding power supply line may be cut off, which may cause a serious problem. .

Therefore, researches on the method of warning the remaining life of the magnetic contactor by checking the remaining life of the magnetic contactor in real time have been actively conducted.

In the related art, in the state where a mechanical reference value (standard operation count value) for calculating the mechanical residual life of the magnetic contactor is previously determined, the mechanical contact count is accumulated each time the magnetic contactor performs one operation, and the mechanical operation count accumulation value is accumulated. The mechanical residual life of the magnetic contactor is exhausted when the cumulative mechanical number of operation times exceeds the mechanical reference value. A method for recognizing that the remaining mechanical life of the magnetic contactor has been exhausted has been proposed and is currently widely used.

However, the remaining life exhaustion warning method of the conventional magnetic contactor as described above, simply by counting the mechanical operation of the magnetic contactor exceeds the predetermined number of times (mechanical life) to determine that the product life of the magnetic contactor has reached the end. As a result, the change in durability according to the electrical use environment of the magnetic contactor was not reflected in the product life of the magnetic contactor at all.

In the method of warning the remaining life of the conventional magnetic contactor, the mechanical reference value (mechanical life) for calculating the mechanical residual life is that the magnetic contactor can safely repeat the mechanical operation under the rated operating current and rated operating voltage. Although given as a value, since the voltage and current of the power source flowing through the magnetic contactor is different depending on the electrical use environment of the field applied to the magnetic contactor applied to the site, the life of the magnetic contactor is greatly influenced by the electrical use environment.

Therefore, there is an increasing demand for a method of checking the electrical life and warning of the exhaustion of the remaining life apart from the mechanical life of the magnetic contactor.

The present invention has been invented to meet the above demands, and an object of the present invention is to provide a method of warning the user that the electrical residual life is exhausted by calculating the electrical residual life of the magnetic contactor.

In addition, in the motor control panel for controlling the operation of the motor, the object of the present invention is to provide a motor control panel that warns the user that the electrical remaining life is exhausted by calculating the electrical remaining life of the magnetic contactor.

The present invention for achieving the above object, the step of setting an electrical reference value for electrical residual life calculation; Measuring an electrical characteristic value of a power supply line with the magnetic contactor switched from "off" to "on"; Calculating the electrical remaining life of the magnetic contactor based on the electrical reference value and the electrical characteristic measurement value; When the electrical remaining life of the magnetic contactor is exhausted, it is a method of warning the remaining life exhaustion of the magnetic contactor, characterized in that the step of outputting the electrical remaining life of the magnetic contactor to the outside.

In addition, the present invention comprises the steps of setting the electrical reference value for the electrical residual life calculation and mechanical reference value for the mechanical residual life calculation; With the magnetic contactor switched from "off" to "on", the electrical characteristic value of the power supply line is measured, the electrical remaining life of the magnetic contactor is calculated based on the electrical reference value and the electrical characteristic measurement value, and the magnetic contactor An electrical remaining life warning step of outputting the electrical remaining life exhaustion of the magnetic contactor to the outside when the electrical remaining life of the electronic device is exhausted; When the magnetic contactor is switched from "on" to "off", the operation count of the magnetic contactor is accumulated, and the mechanical residual life of the magnetic contactor is calculated based on the mechanical reference value and the mechanical operation count accumulation value, and the mechanical residual life of the magnetic contactor is calculated. When the exhaustion of the remaining contact life of the magnetic contactor is characterized in that the mechanical remaining life warning step characterized in that it consists of a mechanical remaining life warning step of outputting the exhaustion of the remaining mechanical life of the magnetic contactor.

In addition, the present invention, the voltage supply unit is installed in the power supply line to the motor, and measures the voltage of the power supply line; A current measuring unit installed at a power supply line to the motor to measure a current of the power supply line; A magnetic contactor installed in the power supply line to the motor to control on / off power supply to the motor; A control unit which receives the measured voltage from the voltage measuring unit and the measured current from the current measuring unit to control the operation of the magnetic contactor; An input unit for controlling the operation of the control unit; A motor control panel having an operation unit controlled by a control unit and outputting an operating state of the motor control panel to an external device, the control unit comprising: an electrical reference value for calculating an electrical residual life input from an input unit, a voltage measuring unit and a current measuring unit; A motor characterized by calculating the electrical remaining life of the magnetic contactor by using the measured electrical characteristic input from the motor, and outputting the electrical remaining life of the magnetic contactor to the outside through the output unit when the electrical remaining life of the magnetic contactor is exhausted. It is a control panel.

In addition, the present invention, the voltage supply unit is installed in the power supply line to the motor, and measures the voltage of the power supply line; A current measuring unit installed at a power supply line to the motor to measure a current of the power supply line; A magnetic contactor installed in the power supply line to the motor to control on / off power supply to the motor; A control unit which receives the measured voltage from the voltage measuring unit and the measured current from the current measuring unit to control the operation of the magnetic contactor; An input unit for controlling the operation of the control unit; A motor control panel having an operation unit controlled by a control unit and outputting an operating state of the motor control panel to an external device, the control unit comprising: an electrical reference value for calculating an electrical residual life input from an input unit, a voltage measuring unit and a current measuring unit; Calculating the residual electrical life of the magnetic contactor based on the electrical characteristic measurement value inputted from the electronic device, and outputting the residual electrical life of the magnetic contactor to the outside through the output unit when the electrical residual life of the magnetic contactor is exhausted; When the magnetic contactor is switched from "on" to "off", the mechanical operation count is accumulated, and the mechanical contact value of the magnetic contactor is mechanically calculated based on the mechanical reference value for calculating the mechanical residual life input from the input unit and the mechanical operation count accumulation value of the magnetic contactor. By calculating the remaining life, when the mechanical remaining life of the magnetic contactor is exhausted, it is a motor control panel characterized in that the output of the electrical remaining life of the magnetic contactor to the outside through the output unit.

According to the residual life exhaustion warning method according to the present invention, since the electrical residual life of the magnetic contactor is calculated in real time, when all the residual electrical life is exhausted, it is immediately output to the outside, so that the user quickly recognizes the electrical life of the magnetic contactor. In addition, the new magnetic contactor can be replaced at a suitable time, so that damage to an electric circuit such as deterioration or a motor failure or a power failure can be prevented appropriately.

In addition, as in the present invention, when the electrical residual life and mechanical residual life of the magnetic contactor is calculated in real time, if either of the electrical residual life or mechanical residual life is exhausted, the method of immediately outputting it to the outside In addition, the user can be more stable to replace the magnetic contactor, there is an effect that the operation of the electrical circuit with the magnetic contactor is stable.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

According to Figure 1, the motor control panel 100 according to the present invention, is provided in the power supply line to the motor 200, the voltage measuring unit 110 for measuring the voltage of the power supply line; A current measuring unit 120 installed at a power supply line to the motor 200 to measure a current of the power supply line; A magnetic contactor 130 installed in a power supply line to the motor 200 to control on / off supply of power to the motor 200; A control unit 140 which receives the measurement voltage from the voltage measuring unit 110 and the measurement current from the current measuring unit 120 to control the operation of the magnetic contactor 130; An input unit 150 for controlling the operation of the control unit 140; Operationally controlled by the control unit 140, and has a structure having an output unit 160 for outputting the operating state of the motor control panel to the outside.

As the voltage measuring unit 110 and the current measuring unit 120, a known one capable of measuring the current and the voltage of the power supply line was applied.

As the magnetic contactor 130, a known magnetic contactor for controlling on / off of a load current by an external control signal was applied.

The input unit 150 may be any known one as long as it has a means for inputting an electrical reference value for calculating the electrical residual life.

The output unit 160 may be any known one as long as it can warn the exhaustion of the remaining electrical life. In the present exemplary embodiment, a display for visually warning the remaining electric life remaining and a buzzer for visually warning the remaining electric life remaining are applied to the output unit 160.

On the other hand, reference numeral "170" is installed in the power supply line, the breaker to cut off the power supply line when an abnormal current is applied to the power supply line.

Referring to Figures 1 and 2 step by step description of the residual life exhaustion warning method of the magnetic contactor according to the present invention.

1. Setting an electrical reference value for calculating the electrical residual life.

This step is to set the electrical reference value in advance in order to calculate the electrical remaining life of the magnetic contactor 130, in the present embodiment, the user operates the input unit 150 constituting the motor control panel 100 to set the electrical reference value Input to the control unit 140 to store.

2. Measuring the electrical characteristics of the power supply line with the magnetic contactor 130 switched from " off " to " on ".

This step is a state in which the magnetic contactor 130 is switched from "off" to "on" so that power is supplied to the motor 200 through the magnetic contactor 130, that is, the electrical characteristic value of the power supply line, that is, the magnetic contactor ( In step 130, the electrical characteristic value is measured in real time. In the present embodiment, the electrical characteristic value is measured in real time through the current measuring unit 120 and the voltage measuring unit 110 constituting the motor control panel 100. do.

3. Computing the electrical remaining life of the magnetic contactor 130 based on the electrical reference value and the electrical characteristic measurement value.

This step is a step of calculating the electrical remaining life of the magnetic contactor 130 based on the electrical reference value previously set in the first step and the electrical property measurement value measured in real time in the second step, in the present embodiment In the control unit 140 constituting the (100), the electrical reference value for the electrical residual life calculation input from the input unit 150, and the electrical characteristic measurement value input from the voltage measuring unit 110 and the current measuring unit 120 By way of calculation, the electrical remaining life of the magnetic contactor is processed.

4. When the remaining electrical life of the magnetic contactor 130 is exhausted, outputting the remaining electrical life of the magnetic contactor 130 to the outside.

This step is a step of outputting to the outside so that the user can immediately grasp this in real time when the electrical remaining life of the magnetic contactor 130 is exhausted, in the present embodiment in the control unit 140 constituting the motor control panel 100 It is determined whether the electrical remaining life of the magnetic contactor 130 is exhausted and outputs the electrical remaining life exhaustion of the magnetic contactor 130 to the outside through the output unit 160.

According to the present invention, since the remaining electrical life of the magnetic contactor 130 is calculated in real time, and outputs it immediately to the outside when the remaining electrical life is exhausted, the user quickly reached the end of the electrical life of the magnetic contactor 130 It can be recognized and replaced with a new magnetic contactor at an appropriate time, so that damage to electrical circuits such as deterioration, motor failure, or power failure can be prevented properly.

The electrical reference value in the first step is composed of 'condition to subtract the electrical life' and 'electric reference life (electric maximum life or subtractive life)' under the conditions, and 'condition to subtract the electrical life' is necessary. According to the present invention, the electrical reference life may also be appropriately changed in consideration of the condition to subtract the electrical life.

In addition, the electrical specific measurement value in the second step is determined in consideration of the 'condition to subtract the electrical life' constituting the electrical reference value in the first step.

Table 1 below shows an example of the electrical reference value in the first step. The reference current, voltage, and power factor are applied as 'conditions to subtract the electrical life', and the reference lifespan is applied as the 'electric reference life'.

Grade Decommissioning Decommissioning and Blocking Reference current Reference voltage Reference power factor Lifespan Reference current Reference voltage Reference power factor Lifespan AC-1 - - - - 1.5Ie 1.05Ue 0.8 50 AC-2 - - - - 4Ie 1.05Ue 0.65 50 AC-3 10Ie Ue 0.45 (Ie≤100A) 50 8Ie 1.05Ue 0.45 (Ie≤100A) 50 AC-4 10Ie Ue 0.45 (Ie> 100A) 50 10Ie 1.05Ue 0.45 (Ie> 100A) 50 DC-1 - - - - 1.5Ie 1.05Ue 1.0 50 DC-3 - - - - 4Ie 1.05Ue 2.5 50 DC-5 - - - - 4Ie 1.05Ue 15 50 AC-15 - - - - 1.0Ie 1.1 Ue 0.3 10 DC-13 - - - - 1.1Ie 1.1 Ue 6P 10

Here, Ie is a rated current, Ue is a rated voltage, AC-1 ~ DC-13 is the KS C4504 of the Korean Standards (KS) and the International Electrotechnical Commission (IEC) As an application class of the motor 200 (motor) classified by IEC 60947, the motor 200 connected to the magnetic contactor 130 is classified according to the starting method.

The AC-1 class to the DC-13 class are as follows.

AC-1 class: opening and closing of non-inductive and oleophobic resistance loads,

AC-2 class: start and stop of winding type induction motor,

AC-3 class: start and stop of squirrel cage induction motor,

AC-4 class: starting, reverse phase braking and inching of squirrel cage induction motors,

AC-12 class: opening and closing of resistance load

AC-15 class: opening and closing of coil load

DC-1 class: opening and closing of non-inductive and inductive resistance loads,

DC-3 class: starting of decentralized motor, reverse braking and inching,

DC-5 class: starting, reverse braking and inching of series motors,

DC-12 class: opening and closing of resistance load

DC-15 class: opening and closing of coil load.

In this case, as the measured value of the electrical characteristics, the applied current, voltage, and power factor are applied. If the measured used current, voltage, and power factor satisfies the reference current, voltage, and power factor, the remaining electric life is reduced by one time from the reference lifespan. Calculate

For example, in a state in which the motor 200 connected to the magnetic contactor 130 is AC-3 class, when the measured use current is 10Ie, the use voltage is Ue, and the use power factor is 0.45 (Ie≤100A), It is assumed that the remaining life is 49 times by subtracting one from 50 times the standard life. Here, in the case of Table 1, the 'electric reference life' is given as the maximum number of electrical lifespan (for example, the reference current is 10Ie, the reference voltage is Ue, 50 times under the condition that the reference power factor is 0.45 (Ie≤100A)), If necessary, it may be given as a subtraction life (for example, 1/50 when the reference current is 10Ie, the reference voltage is Ue, and the reference power factor is 0.45 (Ie ≦ 100A), and in this case, the electrical maximum life is 1).

Table 2 below shows another example of the electrical reference value in the first step, where the reference current, voltage, power factor, and energization time are 'conditions to subtract the electrical life', and the number of reference lifespans is applied as the 'electric reference life'. It became.

Grade Decommissioning and Blocking Reference current Reference voltage Reference power factor Energization time Lifespan AC-1 1.0Ie 1.05Ue 0.8 0.05 seconds 6000 AC-2 2.0Ie 1.05Ue 0.65 0.05 seconds 6000 AC-3 2.0Ie 1.05Ue 0.45 (Ie≤100A) 0.05 seconds 6000 AC-4 6.0Ie 1.05Ue 0.45 (Ie> 100A) 0.05 seconds 6000 DC-1 1.0Ie 1.05Ue 1.0 0.05 seconds 6000 DC-3 2.5Ie 1.05Ue 2.0 0.05 seconds 6000 DC-5 2.5Ie 1.05Ue 7.5 0.05 seconds 6000 AC-15 10Ie 1.1 Ue 0.3 0.05 seconds 6000 DC-13 1.1Ie 1.1 Ue 6P 0.05 seconds 6000

Here, the energization time represents a time for which the reference current, voltage, and power factor conditions are maintained.

In this case, as the measured value of the electrical characteristics, the applied current, voltage, and power factor are applied, and when the measured used current, voltage, and power factor satisfies the reference current, voltage, and power factor during the energizing time, the electric power is deducted once from the reference lifespan. Calculate remaining life.

For example, in a state in which the motor 200 connected to the magnetic contactor 130 is DC-1, if the measured use current is 1.0Ie, the use voltage is 1.05Ue, and the use power factor is 1.0 for 0.05 seconds. In other words, the remaining life is 5999 times remaining by subtracting one time from the standard lifespan of 6000 times. Herein, in the case of Table 2, the 'electric reference life' is given as the maximum number of electrical lifespans, but as in Table 1, it may be given as a deduction life if necessary.

3A and 3B are graphs illustrating a change in the electrical reference lifespan with respect to the rated operating current for each magnetic contactor, and the electrical reference value may be set using this and the remaining life of the magnetic contactor 130 may be calculated.

In the present embodiment, a graph showing a change in the number of times of electrical reference life with respect to the rated operating current for each magnetic contactor capacity as shown in FIGS. 3A and 3B is made into a separate table, where the rated operating current for each magnetic contactor capacity is 'electrical'. As a condition to subtract the life, the reference life count at the rated operating current for each magnetic contactor capacity is set to 'electric reference life'.

In this case, as the electrical characteristic measurement value, the use current is applied, and the average value of the use current for a predetermined time is compared with the rated use current of the magnetic contactor according to the capacity of the magnetic contactor. Calculate the remaining electrical life by subtracting once from the number of lifetimes. Here, the predetermined time is a time for obtaining the average value of the current used, but in the case of the present embodiment was set to 1 minute, it may be given differently to an appropriate value as necessary.

For example, when the motor 200 connected to the magnetic contactor 130 is AC-4 class, when the capacity of the magnetic contactor 130 is "32", if the average value of the used current measured for 1 minute is "10A" Since the reference lifespan at the rated operating current of the corresponding magnetic contactor capacity is 100,000 times (see FIG. 3B), the remaining life is 99,999 times remaining by subtracting one time from the reference lifespan 100,000 times.

Figures 4a and 4b is a flow chart showing a second embodiment of the residual life exhaustion warning method of the magnetic contactor 130 according to the present invention, the electrical residual life and mechanical residual life of the magnetic contactor 130 in real time It shows how to output to the outside immediately when either of the remaining electrical life or mechanical residual life is exhausted.

The remaining life exhaustion warning method of the magnetic contactor 130 according to the present embodiment is divided into three steps as follows.

1. Setting an electrical reference value for electrical residual life calculation and a mechanical reference value for mechanical residual life calculation (see FIG. 4A).

This step is to set the electrical reference value and the mechanical reference value in advance in order to calculate the remaining life of the magnetic contactor 130, in the present embodiment, the user operates the input unit 150 constituting the motor control panel 100 The reference value and the mechanical reference value are input to the control unit 140 and stored.

Here, the method of setting the electrical reference value is the same as in the method of warning only the electrical remaining life exhaustion with reference to FIG. 2 as described above, and thus a detailed description thereof will be omitted.

On the other hand, the mechanical reference value may be set to the limit (maximum value) that the magnetic contactor can repeat the mechanical operation under the rated operating current and rated operating voltage conditions, the magnetic contactor 130 stably repeats the mechanical operation It is desirable to set the value as small as possible, and Table 3 below shows one such example.

Grade Mechanical life count AC-1 More than 5 million times AC-2 More than 2.5 million times AC-3 1 million times or more AC-4 More than 250,000 times AC-5 50,000 times AC-6 0.5 million times

2. In the state where the magnetic contactor 130 is switched from "off" to "on", by measuring the electrical characteristic value of the power supply line, the electrical residual of the magnetic contactor 130 via the electrical reference value and the electrical characteristic measurement value The electrical residual life warning step of calculating the life and outputting the electrical residual life exhaustion of the magnetic contactor 130 when the electrical remaining life of the magnetic contactor 130 is exhausted (see FIG. 4A).

Since this step is substantially the same as the second to fourth steps in the method of warning only the remaining electrical life remaining with reference to FIG. 2 described above, a detailed description thereof will be omitted.

3. When the magnetic contactor 130 is switched from "on" to "off", the operation number of the magnetic contactor 130 is accumulated, and the mechanical residual of the magnetic contactor 130 is stored based on the mechanical reference value and the accumulated mechanical operation number. The mechanical residual life warning step of calculating the life and outputting the mechanical residual life exhaustion of the magnetic contactor 130 when the mechanical residual life of the magnetic contactor 130 is exhausted (see FIG. 4B).

In this step, the method of associating the mechanical residual life of the magnetic contactor 130 based on the mechanical reference value and the accumulated number of mechanical operations is substantially similar to that of the prior art, and thus the description thereof will be omitted.

On the other hand, also in this step, the control unit 140 constituting the motor control panel 100 determines whether the mechanical remaining life of the magnetic contactor 130 is exhausted through the output unit 160 of the magnetic contactor 130 Outputs the remaining mechanical life exhaustion to the outside.

The present invention is not limited to the above embodiments, and of course, various modifications can be made without departing from the scope of the following claims.

As an example, the remaining life exhaustion warning method of the magnetic contactor according to the present invention is not limited to the application only to the motor control panel as shown in Figure 1, any electrical circuit having an electromagnetic contactor can be applied.

1 is a block diagram showing a motor control panel to which a warning method of remaining life exhaustion of a magnetic contactor according to the present invention is applied;

Figure 2 is a flow chart showing a first embodiment of the residual life exhaustion warning method of the magnetic contactor according to the present invention,

3A and 3B are graphs showing the change in the electrical reference life cycles of the rated operating current according to the capacity of the magnetic contactor. FIG. 3A is a magnetic contactor applied to an AC-3 motor, and FIG. 3B is an AC-4 motor. Figure showing a magnetic contactor applied to,

4A and 4B are flowcharts illustrating a second embodiment of a method for warning remaining life exhaustion of a magnetic contactor according to the present invention.

-Explanation of terms for the main parts of the accompanying drawings-

100; Motor control panel 110; Voltage Measuring Unit,

120; Current measuring unit 130; Magnetic contactor,

140; Control unit 150; Input,

160; Output section 170; breaker,

200; motor.

Claims (7)

Setting an electrical reference value for electrical residual life calculation; Measuring an electrical characteristic value of a power supply line with the magnetic contactor switched from "off" to "on"; Calculating the electrical remaining life of the magnetic contactor based on the electrical reference value and the electrical characteristic measurement value; And when the remaining electrical life of the magnetic contactor is exhausted, outputting the remaining electrical life of the magnetic contactor to the outside. Setting an electrical reference value for electrical residual life calculation and a mechanical reference value for mechanical residual life calculation; With the magnetic contactor switched from "off" to "on", the electrical characteristic value of the power supply line is measured, and the electrical remaining life of the magnetic contactor is calculated based on the electrical reference value and the electrical characteristic measurement value. An electric residual life warning step of outputting the electric residual life exhaustion of the magnetic contactor to the outside when the electric residual life is exhausted; When the magnetic contactor is switched from "on" to "off", the operation count of the magnetic contactor is accumulated, and the mechanical residual life of the magnetic contactor is calculated based on the mechanical reference value and the mechanical operation count accumulation value, and the mechanical residual life of the magnetic contactor is calculated. When the exhaustion of the remaining contact life of the magnetic contactor, characterized in that the mechanical remaining life warning step characterized in that it consists of a mechanical remaining life warning step of outputting the exhaustion of the mechanical remaining life of the magnetic contactor. The electrical reference value according to claim 1 or 2, wherein the reference current, voltage, and power factor, and the number of reference lifetimes when these reference current, voltage, and power factor conditions are satisfied are used, and the electrical reference value is used. If the measured current, voltage and power factor satisfies the reference current, voltage and power factor, the remaining life of the magnetic contactor is calculated once by subtracting it from the reference life cycle once. Exhaustion warning. 4. The method according to claim 3, wherein an energization time is added to the electrical reference value, and if the measured use current, voltage, and power factor satisfies the reference current, voltage, and power factor during the energization time, the electrical remaining life is calculated by subtracting the number of reference lifetimes once. Residual life exhaustion warning method of the magnetic contactor, characterized in that. The electric reference value according to claim 1 or 2, wherein the rated operating current for each magnetic contactor capacity and the number of reference lifetimes at the rated operating current for each magnetic contactor capacity are applied. Is applied to compare the average value of current used for a certain period of time with the rated operating current of the magnetic contactor according to the capacity of the magnetic contactor, and calculates the remaining electrical life by subtracting it once from the reference lifespan at the rated operating current of the corresponding magnetic contactor capacity. Warning method for exhaustion of remaining life of the magnetic contactor. A voltage measuring unit 110 installed at a power supply line to the motor 200 and measuring a voltage of the power supply line; A current measuring unit 120 installed at a power supply line to the motor 200 to measure a current of the power supply line; A magnetic contactor 130 installed in a power supply line to the motor 200 to control on / off supply of power to the motor 200; A control unit 140 which receives the measurement voltage from the voltage measuring unit 110 and the measurement current from the current measuring unit 120 to control the operation of the magnetic contactor 130; An input unit 150 for controlling the operation of the control unit 140; In the motor control panel having an output unit 160 that is operationally controlled by the control unit 140, and outputs the operating state of the motor control panel to the outside, In the control unit 140, the electronic contactor based on the electrical reference value for the calculation of the residual electrical life input from the input unit 150, and the electrical characteristic measurement values input from the voltage measuring unit 110 and the current measuring unit 120, Computing the remaining electrical life of the motor control panel, characterized in that when the remaining electrical life of the magnetic contactor is exhausted to output to the outside through the output unit 160. A voltage measuring unit 110 installed at a power supply line to the motor 200 and measuring a voltage of the power supply line; A current measuring unit 120 installed at a power supply line to the motor 200 to measure a current of the power supply line; A magnetic contactor 130 installed in a power supply line to the motor 200 to control on / off supply of power to the motor 200; A control unit 140 which receives the measurement voltage from the voltage measuring unit 110 and the measurement current from the current measuring unit 120 to control the operation of the magnetic contactor 130; An input unit 150 for controlling the operation of the control unit 140; In the motor control panel having an output unit 160 that is operationally controlled by the control unit 140, and outputs the operating state of the motor control panel to the outside, In the control unit 140, the electronic contactor based on the electrical reference value for the calculation of the residual electrical life input from the input unit 150, and the electrical characteristic measurement values input from the voltage measuring unit 110 and the current measuring unit 120, Calculating the remaining electrical life of the electronic output, when the remaining electrical life of the magnetic contactor exhausts the remaining electrical life of the magnetic contactor through the output unit 160; When the magnetic contactor is switched from "on" to "off", the number of mechanical operations is accumulated, and the electronic reference is calculated based on the mechanical reference value for calculating the mechanical residual life input from the input unit 150 and the accumulated mechanical operating number of the magnetic contactor. Computing the mechanical remaining life of the contactor, when the mechanical remaining life of the magnetic contactor exhausts the electrical remaining life of the magnetic contactor, characterized in that to output to the outside through the output unit (160).

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