KR100907881B1 - Method for controlling peak power of redundant power controller - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peak power control method for an idle power controller capable of sequentially controlling peak power for general and industrial electric input / output power supplies.

The present invention relates to an overcurrent protection circuit comprising control means for controlling an output voltage at a winding ratio of a main winding to an excitation winding and a proportional voltage winding with respect to an input voltage and controlling a level of an output voltage by adjusting a step- A peak power control method for a controller, comprising: detecting a current power amount and comparing the detected current amount of power with a predetermined target amount of power; And sequentially performing a power cut operation for the power supply device according to a predetermined power efficiency level if the current power amount is equal to or greater than a predetermined ratio of the target power amount.

Peak power control, wattage, alarm rate, set value, forced shutdown

Description

[0001] The present invention relates to a peak power control method for a surplus power controller,

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a conventional automatic voltage regulator. FIG.

2 is an overall configuration diagram of a surplus power controller according to an embodiment of the present invention;

3 is a flowchart illustrating an operation state of a peak power control method for an idle power controller according to an embodiment of the present invention.

4 is a flowchart illustrating an operation state of an output voltage control method of an idle power controller according to an embodiment of the present invention.

5 is a graph showing changes in voltage and power supplied from KEPCO by time slot.

6 is a graph showing a state where an output voltage is controlled according to an embodiment of the present invention;

7 is a view showing one embodiment of the setting and display unit shown in Fig.

8 is a chart showing various setting states set by the setting unit of Fig.

9A to 9H are diagrams of setting states shown in Fig. 2 in the setting and display section of Fig.

Figs. 10A to 10M are display state diagrams displayed on the setting and display unit in accordance with the setting state in Fig.

DESCRIPTION OF REFERENCE NUMERALS used in main parts of the drawings

101 to 103: main winding 104 to 106: proportional voltage winding

107 to 109: exciting winding 200: control means

210: peak power controller 300: setting and display unit

The present invention relates to a peak power control method for an idle power controller, and more particularly, to a peak power control method for an idle power controller capable of sequentially controlling peak power for general and industrial electric power input / output.

In addition, the present invention relates to a peak power control method for an idle power controller capable of power control by period for input and output power of general and industrial electric power.

The present invention also relates to a peak power control method for an idle power controller capable of selectively controlling at least one of peak power control and period-by-period power control according to the present invention.

Electricity consumption is increasing every year with the increase in national income. In particular, in the summer, power supply and demand is not stable due to the cooling load, and systematic measures for managing power demand are emerging.

Conventionally, a peak power controller is used to check the amount of power in real time. When the amount of power is predicted to exceed a predetermined limit value, that is, a peak, the system automatically stops the ventilation and cooling system for a predetermined period of time, The user is discomforted by forcibly stopping the electric product, and the life of the electric product is shortened due to the low voltage phenomenon due to the power over consumption.

If the electric power demand during the day is large, the electric power demand is reduced during the night time when the electric power is boosted by the KEPCO and over voltage is supplied to the electric appliance.

In order to solve such a problem, the present applicant has proposed an automatic voltage regulator for a power saver using a voltage changer such as the Korean Utility Model Registration No. 411863.

It is to be noted that the conventional automatic voltage regulator proposed by the present applicant is a product having the same or similar structure as that of the surplus power controller of the present invention, and the name thereof is different according to the use purpose.

A conventional automatic voltage regulator proposed by the present applicant will be briefly described with reference to Fig.

The conventional automatic voltage regulator includes main windings L1, L4 and L7 connected in series to phases A, B and C and main windings L1, L4 and L7 of phases A, B and C, L4 and L7 in proportion to the proportional voltage of the proportional voltage windings L3, L6 and L9 and the proportional voltage of the proportional voltage windings L3, L6 and L9, L2, L5, and L8 and the output voltages of the phases A, B, and C are compared with predetermined set voltages, and the stepping motor is operated in accordance with the results to calculate the proportional voltage by the proportional voltage windings L3, L6, and L9 (Referred to as a " PCB control board " in Fig. 1) for controlling the voltage to be increased or decreased.

In other words, to describe a phase (for example, phase A) of each phase (A, B, C), when the line voltage supplied from KEPCO is 400 V, √3 to 230V. When the set voltage of the customer set by the control means is 220V, the control means drives the stepping motor so that the proportional voltage winding is moved in the downward direction until the output voltage of each phase becomes 220V. When a predetermined time has elapsed and the output voltage of each phase is 220V, the control means stops driving the stepping motor, so that the output voltage of each phase maintains the set voltage of 220V set by the control means.

Meanwhile, when the line voltage supplied from KEPCO is 360V, the phase voltage of each phase is 360 / √3 to 207V. Since the set voltage of the customer set by the control means is 220V, the control means drives the stepping motor so that the proportional voltage winding is moved in the boosting direction until the output voltage of each phase becomes 220V. When a predetermined time has elapsed and the output voltage of each phase is 220V, the control means stops driving the stepping motor, so that the output voltage of each phase maintains the set voltage of 220V set by the control means.

If the above process is repeated for each phase, the output voltage of each phase is maintained at the set voltage of 220V, and the output voltage of each phase is stabilized.

Thus, when the output voltage of each phase (A, B, C) is supplied higher or lower than the set voltage, the conventional automatic voltage regulator sets the voltage of the required level in the customer in advance and increases or decreases the proportional voltage winding To maintain the output voltage at the set voltage state.

The present invention provides a method of controlling peak power of an idle power controller that compares an output power amount with a predetermined target power amount and forcibly controls a power amount according to a result of the comparison.

Another object of the present invention is to provide a peak power control method of an idle power controller having a function of controlling an output voltage with respect to a target voltage by a predetermined period.

It is still another object of the present invention to provide a power management system and a power management method, which are capable of performing a peak power control function for forcibly controlling an amount of power according to a result of a comparison between an amount of output power and a predetermined target amount of power, A peak power control method of a surplus power controller.

The present invention relates to an overcurrent protection circuit comprising control means for controlling an output voltage at a winding ratio of a main winding to an excitation winding and a proportional voltage winding with respect to an input voltage and controlling a level of an output voltage by adjusting a step- A method for controlling peak power of a controller, comprising: detecting a current power amount and comparing the detected current amount of power with a predetermined target amount of power; And sequentially performing a power cut operation for the power supply device according to a predetermined power efficiency level if the current power amount is equal to or greater than a predetermined ratio of the target power amount.

Meanwhile, the present invention includes control means for controlling the output voltage by controlling the winding ratio of the main winding to the excitation winding and the proportional voltage winding with respect to the input voltage, and controlling the level of the output voltage by adjusting the step-up / step-down of the proportional voltage winding A peak power control method for a surplus power controller comprising the steps of: detecting a current power amount, comparing the detected current power amount with a preset target power amount, and if the current power amount is equal to or greater than a predetermined ratio of the target power amount, A peak power cutoff step of sequentially performing a power cutoff operation on the power supply device according to the power cutoff step; And detects a current time, detects a set voltage for a predetermined period, detects a current output voltage, compares the set voltage with the output voltage, and when the output voltage is higher or lower than the set voltage And an output voltage control step of controlling the output voltage by placing the proportional voltage winding in either the step-up winding or the step-down winding, The peak power cutoff step, and the output voltage control step.

The method may further include generating a predetermined alarm signal if the current power amount is higher than an alarm rate set at a predetermined ratio with respect to the target amount of power.

When the current power amount reaches the forced cut-off rate set at a predetermined ratio with respect to the target amount of power, the power cut-off operation for the power source device is sequentially performed according to the predetermined power efficiency level.

Further, the forcible cut-off rate is set to a power amount higher than the alarm rate and lower than the target power amount.

Further, the forcible cut-off rate is set to be divided into a plurality of classes within a range of a power amount higher than the alarm rate and lower than the target power amount; Compares the power amount divided for each rank with the current power amount; And the power of the power supply unit classified according to the predetermined power efficiency class is separated according to the comparison result.

The output voltage control step may include: detecting a current time and detecting a preset voltage for a predetermined period; Detecting an output voltage presently being output; Comparing the set voltage with the output voltage; A step-down signal is transmitted from the control means when the output voltage is higher than the set voltage, and the excitation winding is connected to the step-down winding of the proportional voltage winding in accordance with the step-down signal; A step-up signal is transmitted from the control means when the output voltage is lower than the set voltage, and the excitation winding is connected to the step-up winding of the proportional voltage winding in accordance with the step-up signal sent out so that the output voltage is stepped up; And returning the proportional voltage winding to a neutral state if the output voltage is equal to the set voltage.

In addition, the set voltage for the period is set according to at least one period of time, month, minute, day, daytime / nighttime.

The method may further include the step of indicating that the current mode is the voltage automatic control mode according to the set voltage for each period.

The method may further include the step of generating an alarm signal when the output voltage is higher or lower than the set voltage in the step of comparing the set voltage and the output voltage.

It may further comprise a setting step of setting the set voltage for each period.

Further, it may further include an automatic voltage adjustment display step for each period in which the set value of automatic voltage adjustment for each period is displayed.

A voltage / current / utilization ratio display step of displaying the current input power voltage, the effective value of the current and the usage amount of the set power consumption; An instantaneous power and power factor value display step in which instantaneous power and power factor values currently used are displayed; An instantaneous, invalid and apparent power display step in which currently valid instantaneous, invalid, and apparent power values are displayed; A watt-hour meter display step of displaying a watt-hour amount for each phase; A maximum current display step in the overcurrent state in which the maximum current value of each phase is displayed in an overcurrent state; An automatic / manual voltage display step in which a voltage adjustment mode is automatically displayed, a manual display is displayed, and a set value is displayed; An overcurrent relay display step in which a set state and a set value relating to an overcurrent are displayed; An undervoltage relay display step in which a setting state and a setting value relating to the undervoltage relay are displayed; A temperature relay display step in which a set state and a set value of the temperature relay are displayed; A date / time display step in which the current year / month / day / hour is displayed; And a fixed history display step of checking a failure history of the redundant power controller.

Hereinafter, preferred embodiments (s) of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components in the drawings. In the following description, numerous specific details are set forth, such as specific circuit components, etc., which are provided to aid a more thorough understanding of the present invention, and that the present invention may be practiced without these specific details, To those of ordinary skill in the art. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

3 is a flowchart illustrating an operation of a peak power control method for an idle power controller according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating an operation state of an output voltage control method of an idle power controller according to an exemplary embodiment of the present invention. FIG. 5 is a graph illustrating changes in voltage and power supplied from KEPCO And FIG. 6 is a graph illustrating a state in which an output voltage is controlled according to an embodiment of the present invention. FIG. 7 is a diagram illustrating one embodiment of the setting and display unit shown in FIG. 2, Fig. 9A to Fig. 9H are diagrams showing the setting state shown in Fig. 2 and the setting state shown in Fig. 8, and Figs. 10A to 10M are diagrams 9 is a display state diagram displayed on the setting and display unit in accordance with the setting state in Fig.

2, a redundant power controller according to an embodiment of the present invention includes main windings 101 to 103 connected in series to respective phases A, B and C, The proportional voltage windings 104 to 106 connected in parallel to the main windings 101 to 103 of the main windings 101 to 103 and the main windings 101 to 103 in proportion to the proportional voltage of the proportional voltage windings 104 to 106, And an exciting winding 107 to 109 for exciting the exciting coil.

Further, the output voltage is compared with a predetermined set voltage for each predetermined set period of each of the phases A, B, and C, and the stepping motor is operated according to the result to determine the proportional voltage by the proportional voltage windings 104 to 106, (200) for controlling power to be turned on or off and simultaneously checking the amount of power currently being used and for stopping the power or generating an alarm when a predetermined ratio of the predetermined target amount of power is reached; and a control unit And a setting and display unit 300 having a setting unit for setting a power amount and an alarm rate and a forced blocking rate, and a display unit for displaying a page according to various setting modes and a setting result (see FIG. 8).

Here, the control means 200 detects the input voltage, the output voltage, and the input current of each of the phases A, B, and C, compares the detected output voltage with a predetermined set voltage, Respectively. In addition, the control means 200 detects the current amount of power, compares the detected amount of power with a predetermined target amount of power, and performs an alarm or a power-off function according to the result.

In addition, the control means 200 may be configured to store the set voltage set by the operator, the period information set for performing the automatic control mode for each period, and the storage medium for storing the predetermined target amount of power, the alarm rate and the forced cut- . At this time, the storage medium may be any of ordinary storage media such as a nonvolatile memory or a hard disk.

The control unit 200 and the setting and display unit 300 may be integrated into one device.

It is also assumed that the main windings 101 to 103 and the excitation windings 107 to 109 are constituted of a single winding type in which one core is shared and wound adjacent to each other. Quot; is readily changeable by those skilled in the art.

7, the redundant power controller according to the embodiment of the present invention includes setting keys (Move key, Editor key, Dec key, Inc key, Reset key) for various settings, Examples of key usage are as follows.

- Move key: Moves the cursor when the page and editor keys are pressed.

- Inc key: increase setting value

- Dec key: Decrease setting value

- Editor key: When setting each page and setting completed

- Reset key: Reset to initial screen on each screen

At this time, it is obvious that the use of the setting key may be arbitrarily changed within the scope of the present invention.

8, the redundant power controller according to the embodiment of the present invention can set various use environments as shown in FIG. 8 using the above setting keys, and the set contents are displayed on the setting and display unit 300).

In addition, the operator can operate the setting key to display the current operating state of the surplus power controller on the display unit.

Here, an example of the current operating state of the surplus power controller displayed on the display window of the setting and display unit 300 is shown in Figs. 10A to 10M.

That is, the surplus power controller has a function of displaying the voltage / current / utilization ratio indicating the actual value of the voltage / current of the currently input power source and the usage amount of the set power amount according to the display state setting of the operator, An effective / ineffective / apparent power display function for displaying an instantaneous power / power / power factor display function to be displayed, an instantaneous effective / ineffective / apparent power value currently being used, a watt hour meter display function for displaying a power amount for each phase, , Automatic / manual voltage display function for checking the automatic / manual setting status of the voltage adjustment and the set value, and automatic voltage adjustment for the period for displaying the set value of the automatic voltage adjustment by period of time Display function, overcurrent relay display function for checking the setting status and set value of overcurrent, setting status and setting value of undervoltage relay A set state and set value display function of the thermometer for checking the set state and set value of the temperature relay, and a peak power controller for displaying the set value for peak power control A display function, a date / time display function for displaying the current year / month / day / hour, and a failure history display function for confirming the failure history.

That is, the surplus power controller of the present invention assumes that at least one of the peak power control mode and the voltage automatic control mode according to the set voltage for each period is selectively performed by the operator.

3A and 3B, when the operator sets the redundant power controller to 1) the peak power control mode, the operation and display unit 300 displays the surplus power controller in the current peak power control mode ( S101), and the peak power controller 210 detects the current power amount (S102).

Thereafter, the peak power controller 210 compares the detected current power amount with an alarm rate (for example, 90% of the target power amount) of a predetermined target power amount (S103). As a result of the comparison, if the current power amount exceeds the preset alarm rate (S104), the peak power controller 210 generates an alarm through the setting and display unit 300 and compares the current power amount with the predetermined voltage adjustment power amount (S105 ). Here, the preset voltage adjustment power amount refers to a preset reference power amount for controlling the amount of power consumed by adjusting the level of the output voltage. That is, when the current power exceeds the preset alarm rate and simultaneously exceeds the predetermined voltage adjustment power, the redundant power controller automatically reduces the output voltage by decreasing the amount of power consumed (S107).

At this time, the control means 200 outputs a step-down signal to the stepping motor so that the excitation windings 107 to 09 are connected to the step-down windings of the proportional voltage windings 104 to 106 in order to reduce the amount of power consumed. The exciting windings 107 to 109 are connected in series to the step-down windings of the proportional voltage windings 104 to 106 and the main windings 101 to 103: the proportional voltage windings 104 to 107 and the exciting windings 107 to 109 The output voltage is stepped down and output.

Thereafter, the peak power controller 210 detects the current amount of power and checks whether the current amount of power has decreased compared to the previously detected amount of power (S108). If the current detected amount of power is decreased in comparison with the previously detected amount of power in step S108, the peak power controller 210 returns to step 103 (S103) and compares the current amount of power with the alarm rate to control the peak power Repeat the process.

On the other hand, if it is determined in step 108 (S108) that the amount of power has not been reduced, the peak power controller 210 compares the current amount of power with a predetermined compulsory blocking rate (for example, 95% of the target amount of power) . As a result of the comparison, if the current amount of power is lower than each of the predetermined forced cutoff rates, the peak power controller 210 performs the power cutoff operation for each step.

That is, if the current amount of power is lower than the predetermined value of the first step of the forced cut-off rate (S110), the peak power controller 210 performs a one-step power cutoff operation (S111) This is done first.

Next, if the current amount of power is higher than the predetermined value of the first step of the forcible blocking rate and lower than the set value of the second step (S112), the peak power controller 210 performs the two-step power cutoff operation (S113) Priority is given to cut off power for products and mid-level products.

Finally, if the current amount of power is higher than the preset two-step set value of the forced cut-off rate, the peak power controller 210 performs a three-step power cut-off operation (S114) .

Thereafter, the peak power controller 210 repeats all the processes after step 102 until the peak power is stabilized by returning to the above power amount detection step (S102).

Meanwhile, in the present invention, it is assumed that all of the above-described power amount cut-off steps are performed in three stages. However, it is obvious that the power cut-off step can be divided into arbitrary steps due to the type of work, the object to be controlled, the time zone and other environmental requirements .

4, when the operator sets the surplus power controller to the voltage automatic control mode according to the set voltage for each period, the operation and display unit 300 displays the surplus power controller in the current period- (Automatic mode for each period) (S201), the control unit 200 detects the present time and detects a predetermined set voltage corresponding to the detected current time S202).

In addition, the control means 200 detects an output voltage currently output in each of the phases A, B and C (S203), and compares the output voltage with a value higher than a predetermined set voltage (S204).

If the current output voltage of each of the phases A, B, and C is higher than a predetermined set voltage, the control unit 200 controls the setting and display unit 300 to generate an alarm signal (S205) The motor is operated to output a step-down signal so that the exciting windings 107 to 109 are connected to the step-down winding of the proportional voltage windings 104 to 106 (S206).

The exciting windings 107 to 109 are connected in series to the step-down windings of the proportional voltage windings 104 to 106 and the main windings 101 to 103: the proportional voltage windings 104 to 107 and the exciting windings 107 to 109 The output voltage is stepped down and output.

Thereafter, the control means 200 checks the current time, re-detects the set voltage corresponding to the current time, and returns to Step 302 to return to Step 302, Steps are repeated.

If the current output voltage of each of the phases A, B, and C is lower than a preset voltage (S307), the control unit 200 controls the setting and display unit 300 to generate an alarm signal (S308 , The stepping motor is operated to output a step-up signal so that the exciting windings 107 to 109 are connected to the step-up windings of the proportional voltage windings 104 to 106 (S309).

Thus, the exciting windings 107 to 109 are connected in series to the step-up windings of the proportional voltage windings 104 to 106, and the main windings 101 to 103: the proportional voltage windings 104 to 107 and the exciting windings 107 to 109 The output voltage is stepped up and output.

Thereafter, the control means 200 checks the current time, re-detects the set voltage corresponding to the current time, and returns to Step 302 to return to Step 302, Steps are repeated.

Therefore, the surplus power controller can output the output voltage maintained at the predetermined set voltage for each period.

Meanwhile, in the voltage automatic control mode according to the set voltage for the above period, the period can be set preferably in units of time, and it can be changed and set by minute, day, day, This state is well illustrated in Figs. 6 and 7. Fig.

In addition, the operator can input a desired set value by operating various keys of the display and setting unit 300, and can confirm the setting of the surplus power controller and the current operating state by the display window.

Although the present invention has been described in detail with respect to specific embodiments thereof, it should be understood that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiment (s), but should be defined by equivalents to the appended claims, as well as the following claims.

The present invention checks an amount of power currently consumed and generates an alarm signal when the current amount of electric power exceeds a predetermined target amount of electric power and performs a sequential power cutoff operation according to the current amount of electric power to stabilize the consumed amount of electric power, Is possible.

If the output voltage of each phase of the surplus power controller is higher or lower than the predetermined set voltage, the output voltage is automatically controlled to be raised / lowered to the set voltage level, It is easy to manage, unnecessary power consumption can be prevented, and erroneous operation and failure of the electric / electronic product due to power shortage during the peak time period can be prevented.

Further, since the period for registering the set voltage can be arbitrarily set in units of time unit, day unit, minute unit, stable power supply is possible even in a time zone in which the amount of change in electric power demand is large.

Further, since the setting state of the operator and the current operating state of the surplus power controller are displayed for each page, the operator can easily grasp the current operating state and the management of the surplus power controller is convenient.

Claims (13)

delete And a control means for controlling the output voltage by controlling the output voltage at the winding ratio of the main winding to the excitation winding and the proportional voltage winding with respect to the input voltage and for controlling the level of the output voltage by adjusting the step- In a power control method, Wherein the control unit detects the current amount of power and compares the detected current amount of power with a predetermined target amount of power and if the current amount of power is equal to or greater than a predetermined ratio of the target amount of power, Lt; / RTI > The method of claim 1, further comprising: detecting a current time, detecting a set voltage for a predetermined period, detecting a current output voltage, comparing the set voltage with the output voltage, An output voltage control step of controlling an output voltage by placing a proportional voltage winding in either a step-up winding or a step-down winding; And Generating a predetermined alarm signal if the current amount of power is higher than an alarm rate set at a predetermined ratio with respect to the target amount of power; Lt; / RTI > Wherein the controller is configured to sequentially perform a power cutoff operation for the power supply device according to the predetermined power efficiency level when the current power amount reaches a forced cutoff rate set at a predetermined ratio with respect to the target power amount. Control method. delete delete 3. The method of claim 2, Wherein the forcible cut-off rate is set to a power amount higher than the alarm rate and lower than the target power amount. 6. The method of claim 5, Wherein the forced blocking rate is divided into a plurality of classes within a range of a power amount higher than the alarm rate and lower than the target power amount; Compares the power amount divided for each rank with the current power amount; And to block the power of the power source device classified according to the predetermined grade of the power efficiency according to a result of the comparison, thereby blocking the peak power control of the redundant power controller. 3. The method of claim 2, Wherein the output voltage control step comprises: Detecting a current time, and detecting a preset voltage for a predetermined period of time; Detecting an output voltage presently being output; Comparing the set voltage with the output voltage; A step-down signal is transmitted from the control means when the output voltage is higher than the set voltage, and the excitation winding is connected to the step-down winding of the proportional voltage winding in accordance with the step-down signal; A step-up signal is transmitted from the control means when the output voltage is lower than the set voltage, and the excitation winding is connected to the step-up winding of the proportional voltage winding in accordance with the step-up signal sent out so that the output voltage is stepped up; And And if the output voltage is equal to the set voltage, returning the proportional voltage winding to a neutral state. 8. The method of claim 7, The set voltage for each period is, Wherein the voltage is set according to at least one of a time zone, a month, a minute, a day of the week, and a daytime / nighttime. 8. The method of claim 7, Further comprising the step of indicating that the current mode is the voltage automatic control mode according to the set voltage for each period. 8. The method of claim 7, And generating an alarm signal when the output voltage is higher or lower than the set voltage in the step of comparing the set voltage and the output voltage. 8. The method of claim 7, And setting a period-by-period set voltage. 12. The method of claim 11, And displaying the set value of the automatic voltage adjustment for each period of the period. 3. The method of claim 2, A voltage / current / utilization rate display step of displaying a voltage of a currently input power source, an effective value of a current, and a usage amount of the set power amount; An instantaneous power and power factor value display step in which instantaneous power and power factor values currently used are displayed; An instantaneous, invalid and apparent power display step in which currently valid instantaneous, invalid, and apparent power values are displayed; A watt-hour meter display step of displaying a watt-hour amount for each phase; A maximum current display step in the overcurrent state in which the maximum current value of each phase is displayed in an overcurrent state; An automatic / manual voltage display step in which a voltage adjustment mode is automatically displayed, a manual display is displayed, and a set value is displayed; An overcurrent relay display step in which a set state and a set value relating to an overcurrent are displayed; An undervoltage relay display step in which a setting state and a setting value relating to the undervoltage relay are displayed; A temperature relay display step in which a set state and a set value of the temperature relay are displayed; A date / time display step in which the current year / month / day / hour is displayed; And And a fixed history display step of confirming a failure history of the redundant power controller.

Images