JP2005245184A - Electronic time switch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic time switch device capable of accurately detecting abnormalities such as breakage, shortage and leakage in a load device corresponding to the number of the connected load devices. <P>SOLUTION: This electronic time switch device 1 includes a relay 3 disposed at a power feed line 2 for connecting a power source A with the plurality of load devices B1, B2, B3, a current detector 4, a control unit 5, an input 6, a display unit 7, and a memory 8. The control unit 5 has an abnormal current value setting device 10 which calculates abnormal current value based on the number of load devices inputted by the input 6 to be memorized in the memory 8, an abnormal current value comparison device 11 which compares the set abnormal current value with the load current value detected by the current detector, and an abnormality annunciator 12 which annunciates abnormality when the load current value is larger or smaller than the set abnormal current value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic time switch device that controls on / off of a load device.

Conventionally, installed on a power supply line that supplies power to load equipment, compares the current time with a preset operating time zone, and operates a latching relay etc. when the current time matches the set operating time zone Thus, an electronic time switch device is used in which the power supply line is closed (energized), and when the power supply lines do not coincide with each other, the load device is controlled to be turned on or off. As such an electronic time switch device, there are those disclosed in Patent Document 1 and Patent Document 2.
Japanese Patent Application Laid-Open No. H10-228561 “open / closed state detecting means for detecting the open / closed state of the contact and when the open / closed state detecting means detects opening in a time zone when the contact of the relay should be closed, the contact is closed to the latching relay. Means for providing an energizing signal and providing an energizing signal for opening the contact to the latching relay when the closing of the relay contact is detected at a time when the relay contact should be opened. A switch contact open / close control device "is disclosed. According to the contact opening / closing control device for an electronic time switch disclosed in Patent Document 1, the load current passing through the contact of the latching relay is constantly monitored via a current detector or the like, and the load should be on (or off). When the load current is turned off (or turned on) during the time zone, it is determined that there is an abnormality, and a closing (or opened) signal is given to the latching relay so that it can be quickly restored.
Patent Document 2 includes an arithmetic processing device that monitors the sum of currents supplied to a plurality of load devices connected to a power source via relays and current detectors. When starting up all loads, the relays are started in sequence, and if the total load current exceeds the preset load current total allowable value, an extra number of loads exceeding the number of units that can be operated simultaneously with the total load current allowable value will be exceeded for a specified time. A load group operation device is disclosed in which the operation is stopped, and the shortage operation sequence is executed to change the load to be stopped every time a certain time elapses, and then the operation is returned to the total operation.

JP-A-6-162890 Japanese Utility Model Publication No. 5-84195

However, the above conventional techniques have the following problems.
(1) In the contact opening / closing control device of the electronic time switch disclosed in Patent Document 1, only whether or not current is flowing is detected by an opening / closing state detection means (current detector), and a relay abnormality is determined based on the detection. Therefore, although an abnormality such as a malfunction of the relay can be detected, an abnormality such as a failure in a load device, a short circuit, or a leakage current cannot be detected, resulting in a lack of usability.
(2) In the load group operation device of Patent Document 2, when the sum of the current values detected by the current detectors, that is, the sum of the load currents exceeds the allowable value, the predetermined load is stopped for a predetermined time, and after a certain time has elapsed. Can be operated alternately, but there has been a problem that it cannot be used because it cannot detect abnormalities such as faults, short circuits, and electric leakage in load equipment.

  The present invention solves the above-described conventional problems, and provides an electronic time switch device that can accurately detect an abnormality such as a failure, a short circuit, or a leakage in a load device according to the number of connected load devices. Objective.

In order to solve the above problems, an electronic time switch device of the present invention has the following configuration.
An electronic time switch device according to claim 1 of the present invention includes a relay unit and a current detection unit disposed on a power supply line connecting a power source and a plurality of load devices, a control unit for controlling the whole, An input unit, a display unit, and a storage unit, and the control unit compares the current time with a preset operation time zone, and when the current time matches the set operation time zone, the relay unit An electronic time switch device that turns on and turns off when they do not match, wherein the control unit calculates an abnormal current value based on the number of load devices input by the input unit and stores the abnormal current value in the storage unit Current value setting means, abnormal current value comparison means for comparing the set abnormal current value set by the abnormal current value setting means and the detected current value detected by the current detection section, and when the relay section is on The detected current value The case when the set is greater than the abnormal current value and / or smaller has a configuration including, an abnormality informing means for informing the abnormality.

This configuration has the following effects.
(1) When the relay unit is on, the abnormal current value comparing means compares the set abnormal current value with the detected current value detected by the current detecting unit, and if the detected current value is larger than the set abnormal current value, or If it is small, the abnormality notification means can display an abnormality on the display unit, turn on the abnormality display lamp, or emit an alarm sound from the speaker. An abnormality such as a failure can be detected as a decrease in the load current value, and the user can be notified of the abnormality.
(2) When the number of load devices is input through the input unit, the abnormal current value setting means may calculate a set abnormal current value based on the input number of load devices, and store and set the abnormal current value in the storage unit. Therefore, even if the number of load devices changes, it is possible to set a set abnormal current value corresponding to the load device, and it is possible to accurately detect the abnormality.

Here, when the load current value is larger or smaller than the set abnormal current value, the abnormality notifying means notifies the abnormality and can also stop the supply of power to the load device by turning off the relay unit, or the relay. It is also possible to continue supplying power with the unit kept on.
Further, the abnormal current value setting means can set a plurality of set abnormal current values based on the number of input load devices. Thereby, it can respond in steps according to the detected current value. For example, as the set abnormal current value, the abnormal current value setting means sets the first, second, and third set abnormal current values, and the abnormality notifying means has the detected current value exceeding the first set abnormal current value. When the current value rises and exceeds the second set abnormal current value, a warning sound is generated, and when it rises and exceeds the third set abnormal current value, the relay section is forcibly turned off. The power supply can be stopped.

  The electronic time switch device according to a second aspect of the present invention is the electronic time switch device according to the first aspect, wherein the control unit calculates a load current allowable value based on the number of load devices and stores the load current allowable value in the storage unit. Load current allowable value setting means, load current allowable value comparison means for comparing a set load current allowable value set by the load current allowable value setting means and a detected current value detected by the current detection unit, and the relay And an overcurrent prevention unit that turns off the relay unit when the detected current value is larger than the set load current allowable value when the unit is on.

With this configuration, in addition to the operation of the first aspect, the following operation is provided.
(1) When the relay unit is on, the load current allowable value comparison means compares the set load current allowable value with the load current value detected by the current detection unit, and if the detected current value is larger than the set load current allowable value Since the overcurrent prevention means can turn off the relay unit, it detects a short circuit or leakage of the load device as an increase in the load current value, and stops the power supply to the load device by turning off the relay unit. Accidents can be prevented.
(2) When the number of load devices is input by the input unit, the load current allowable value setting means calculates the set load current allowable value based on the input number of load devices, stores it in the storage unit, and sets it Therefore, even if the number of load devices changes, the set load current allowable value can be set in accordance with it, and the occurrence of a short circuit or electric leakage can be reliably detected.
(3) The abnormal current value setting means and the load current allowable value setting means can set the set abnormal current value and the set load current allowable value based on the number of load devices, so that when an abnormality is detected, it responds step by step. be able to. For example, when a minor abnormality is detected, the abnormality notification means only displays an error. When a severe abnormality is detected, the overcurrent prevention means forcibly turns off the relay unit even within the operation time. If recovery from an abnormality can be expected, turn it off and turn it back on (retry), or if a preset maximum load current value is detected, turn the relay part off completely Various countermeasures can be taken according to the detected abnormality.

  According to a third aspect of the present invention, in the electronic time switch device according to the first or second aspect, the control unit displays the number of load devices input by the input unit on the display unit. It has the structure provided with the number display means.

With this configuration, in addition to the operation of the first or second aspect, the following operation is provided.
(1) When the number of load devices is input by the input unit, the number display means displays the number of load devices input to the display unit on the display unit, so that the number input operation can be easily performed. At the same time, it is possible to easily confirm the number of input units by simply viewing the display unit.

As described above, according to the electronic time switch device of the present invention, the following advantageous effects can be obtained.
According to the invention of claim 1,
(1) To provide an electronic time switch device capable of detecting an abnormality such as a failure of any one of a plurality of load devices as a decrease in load current value and notifying the user of the abnormality. be able to.
(2) It is possible to provide an electronic time switch device that can set an abnormal current value according to the number of load devices and can accurately detect an abnormality.

According to invention of Claim 2, in addition to the effect of Claim 1,
(1) Detects a short circuit or leakage of the load device as an increase in the load current value, and turns off the relay unit to stop the power supply to the load device and to prevent accidents. An electronic time switch device can be provided.
(2) It is possible to provide an electronic time switch device excellent in safety that can set a load current allowable value according to the number of load devices and can reliably detect occurrence of a short circuit or a leakage.
(3) Since the set abnormal current value and the set load current allowable value can be set based on the number of load devices, when an abnormality is detected, it can be dealt with step by step, and various actions can be taken according to the detected abnormality. It is possible to provide an electronic time switch device with excellent applicability.

According to invention of Claim 3, in addition to the effect of Claim 1 or 2,
(1) When there is an input of the number of load devices through the input unit, the unit number display means displays the number of units input on the display unit, so that the number of input devices can be easily input. A time switch device can be provided.
(2) It is possible to provide an electronic time switch device with excellent usability that can easily confirm the number of input units by simply viewing the display unit.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1A is a device block diagram of the electronic time switch device according to the first embodiment, FIG. 1B is a functional block diagram of a control unit, and FIG. 2 shows the electronic time switch device according to the first embodiment. It is a principal part front view of a time switch apparatus.
In FIG. 1, 1 is an electronic time switch device, A is an AC power source, B1, B2, and B3 are connected in parallel to the AC power source A, for example, a load device such as a plurality of blowers provided in a ventilator under the floor, A power supply line for connecting the AC power source A and the load devices B1, B2, and B3, 3 is a relay unit that is disposed on the power supply line 2 and turns on / off the current, and 4 is a power supply line 2 that is disposed on the power supply line 2. A current detection unit for detecting a flowing current, 5 is a control unit for controlling the whole, 6 is an input unit composed of a number input button and an on button, which will be described later, and 7 is a display unit composed of a liquid crystal display unit, an abnormal display lamp, etc. , 8 is a storage unit for storing the number of load devices, etc., 9 is an A / D converter that converts an analog signal of the current value output from the current detection unit 4 into a digital signal and inputs it to the control unit 5, and 10 is an input The number of load devices input by unit 6 Accordingly, an abnormal current value setting means for setting the set abnormal current value, 11 is an abnormal current value comparing means for comparing the set abnormal current value that has been set with the load current value detected by the current detection section 4, and 12 is the relay section 3. When the load current value is larger than and / or smaller than the set abnormal current value when is turned on (closed), an abnormality notifying means for displaying the abnormality on the display unit 7 or the like and notifying the abnormality is provided by the input unit 6. A load current allowable value setting means for setting a set load current allowable value stored in advance in the storage unit 8 or the like based on the number of input load devices or the like, 14 is set by the set load current allowable value and the current detection unit 4 Load current allowable value comparison means 15 for comparing the detected load current value, and 15 indicates that the relay unit 3 is turned off (opened) if the load current value is larger than the set load current allowable value when the relay unit 3 is turned on (closed). Overcurrent protection Means, 16 is a number display means for displaying on the display unit 7 to load device number input by the input unit 6.

In FIG. 2, 20 is a casing of the electronic time switch device 1, 21 is a liquid crystal display unit of the display unit 7, 22 is an abnormal display lamp of the display unit 7, and 23 is supplied with power to the load devices B1, B2, and B3. , A load display lamp 24, 24 is a number input button of the input unit 6, 25 is an input button of the input unit 6, 26 is a OFF button of the input unit 6, and 27 is disposed at the lower part of the casing 20 and A power connection terminal block comprising a screwless terminal block to which the power supply line 2 is connected, 28 is a screwless terminal block disposed at the lower part of the casing 20 and connected to the power supply line 2 from the load devices B1, B2, B3. A load equipment connection terminal block comprising:
Here, the number of load devices B1, B2, B3 may be input by incrementing the input value by one each time the number input button 24 is pressed. It is also possible to directly input the value of the number of units.

The operation of the electronic time switch device 1 according to the first embodiment configured as described above will be described below with reference to FIG.
FIG. 3A is a flowchart showing the operation of the control unit at the time of setting the set abnormal current value and the set load current allowable value, and FIG. 3B is a flowchart showing the operation of the control unit when the load device is operating. .
First, the operation at the time of setting the set abnormal current value and the set load current allowable value will be described with reference to FIG. When the control unit 5 determines that the number of load devices B1, B2, B3 has been input by pressing the number input button 24 of the input unit 6 (S1), the number display means 16 is displayed on the liquid crystal display unit 21 of the display unit 7. The input number is displayed (S2). In the first embodiment, since three load devices B1, B2, and B3 are connected to the AC power source A as shown in FIG. 1 (a), normally three are input by the user. The Next, the abnormal current value setting means 10 calculates the set abnormal current value based on the input number, stores it in the storage unit 8 and sets it, and the load current allowable value setting means 13 sets the load current value setting means 13 based on the input number. A set load current allowable value is calculated, stored in the storage unit 8, and set (S3).
Here, assuming that the power consumption of the load devices B1, B2, and B3 is P (W), the voltage of the AC power source A is E (V), and the number of the load devices B1, B2, and B3 is n (units), The abnormal current value setting means 10 can calculate and set the set abnormal current value by, for example, nP / E (A). Also, a plurality of set abnormal current values can be set. In this case, the abnormal current value setting means 10 calculates the first set abnormal current value by nP / E-C (A), calculates the second set abnormal current value by nP / E (A), The set abnormal current value of 3 is calculated by nP / E + C (A) (C is preset) and set.
Further, the load current allowable value setting means 13 can calculate and set the set load current allowable value by, for example, nP / E + C ′ (A) based on the number of input load devices B1, B2, B3, or The maximum load current value of the load devices B 1, B 2, B 3, for example, 7.8 (A) can be set by the user inputting via the input unit 6.

Next, the operation when the load device is operated will be described with reference to FIG. When the control unit 5 determines that the relay unit 3 is on, that is, the contact of the relay unit 3 is closed (S11), the load current allowable value comparing means 11 stores the set load current allowable value stored in the storage unit 8. The value is compared with the detected current value detected by the current detection unit 4 (S12). If the detected current value is larger than the set load current allowable value, the relay unit 3 is turned off, that is, the contact of the relay unit 3 is opened (S13). ), The process is terminated. Here, the detection current value detected by the current detection unit 4 is larger than the set load current allowable value, for example, when a short circuit or a leakage occurs in the load devices B1, B2, B3, or the power supply line 2 This is the case when an electrical leakage occurs at.
In step S12, if the detected current value is less than or equal to the set load current allowable value, the abnormal current value comparison unit 11 detects the set abnormal current value stored in the storage unit 8 and the detected current detected by the current detection unit 4. If the detected current value is larger than the set abnormal current value (for example, the above-mentioned third set abnormal current value), the abnormality display lamp 22 is turned on to notify the abnormality (S15). Return to S11. In step S14, if the detected current value is equal to or less than the set abnormal current value, the abnormal current value comparing unit 11 calculates the set abnormal current value stored in the storage unit 8 and the current value detected by the current detecting unit 4. (S16), if the detected current value is smaller than the set abnormal current value (for example, the first set abnormal current value described above), the abnormality display lamp 22 is turned on (S15), and the process returns to step S11. Here, the detected current value detected by the current detection unit 4 is smaller than the set abnormal current value, for example, when the operation is stopped due to a failure in the load devices B1, B2, B3, or in the power supply line 2 For example, when a disconnection occurs. In step S16, if the detected current value is equal to or greater than the set abnormal current value, the process directly returns to step S11.

Since the electronic time switch device according to the first embodiment is configured as described above, it has the following effects.
(1) When the number of load devices B1, B2, B3 is input by the number input button 24 of the input unit 6, the abnormal current value setting means 10 calculates the set abnormal current value based on the input number and stores the storage unit 8, the setting abnormal current value corresponding to the number of the load devices B1, B2, B3 can be set, and the abnormality can be detected accurately. Further, the load current allowable value setting means 13 can calculate the set load current allowable value based on the input number and store it in the storage unit 8 so that it can be set according to the number of load devices B1, B2, B3. The set load current allowable value can be set, and the occurrence of a short circuit or leakage can be reliably detected.
(2) When the relay unit 3 is on, the abnormal current value comparison unit 11 compares the set abnormal current value with the load current value detected by the current detection unit 4, and the detected load current value is the set abnormal current value. If it is smaller, the abnormality notifying means 12 can turn on the abnormality display lamp 22 of the display unit 7, so that one of the plurality of load devices B 1, B 2, B 3 is caused by a failure of one of the load devices B 1, B 2, B 3. Abnormalities such as operation stop can be detected as a decrease in the load current value, and the user can be notified of the abnormality.
(3) The load current allowable value comparing means 14 compares the set load current allowable value with the load current value detected by the current detection unit, and if the detected current value is larger than the set load current allowable value, the relay unit 3 is Since it can be turned off, a short circuit or leakage of the load equipment B1, B2, B3 is detected as an increase in the load current value, turning off the relay unit 3 stops the power supply to the load equipment, Generation etc. can be prevented.
(4) When the number of load devices B1, B2, B3 is input by the number input button 24 of the input unit 6, the number display means 16 displays the number input on the liquid crystal display unit 21 of the display unit 7. The number input operation can be easily performed, and confirmation of the input number can be easily performed by simply viewing the display unit 7.
(5) Since the abnormal current value setting means 10 can set a plurality of set abnormal current values, the first, second and third set abnormal current values can be set. The overcurrent prevention means 15 turns on the abnormality display lamp 22 when the detected current value exceeds the first set abnormal current value, and further increases the current value and exceeds the third set abnormal current value, the relay unit. 3 can be forcibly turned off to stop the supply of power, and when an abnormality is detected, it is possible to respond in stages.

  As described above, the present invention relates to an electronic time switch device that controls on / off of a load device. In particular, according to the present invention, an abnormality such as a failure, a short circuit, or a leakage in the load device is detected in the number of connected load devices. Accordingly, it is possible to provide an electronic time switch device that can detect accurately.

(A) Device block diagram of electronic time switch device in Embodiment 1 (b) Functional block diagram of control unit The principal part front view of the electronic time switch apparatus in Embodiment 1 (A) Flow chart showing operation of control section when setting abnormal current value and set load current allowable value are set (b) Flow chart showing operation of control section when load device is operated

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic time switch apparatus 2 Power supply line 3 Relay part 4 Current detection part 5 Control part 6 Input part 7 Display part 8 Memory | storage part 9 A / D converter 10 Abnormal current value setting means 11 Abnormal current value comparison means 12 Abnormality notification Means 13 Load current allowable value setting means 14 Load current allowable value comparison means 15 Overcurrent prevention means 16 Number display means 20 Casing 21 Liquid crystal display section 22 Abnormal display lamp 23 Load display lamp 24 Number input button 25 On button 26 Off button 27 Power supply Connection terminal block 28 Load device connection terminal block A AC power supply B1, B2, B3 Load device

Claims (3)

A relay unit and a current detection unit disposed on a power supply line connecting a power source and a plurality of load devices, a control unit for controlling the whole, an input unit, a display unit, and a storage unit, The control unit is an electronic time switch device that compares the current time with a preset operation time zone and turns the relay unit on when the current time matches the set operation time zone and turns off when the current time does not match. There,
The controller is
An abnormal current value setting unit that calculates an abnormal current value based on the number of load devices input by the input unit and stores the abnormal current value in the storage unit;
Abnormal current value comparison means for comparing the set abnormal current value set by the abnormal current value setting means and the detected current value detected by the current detection unit;
An abnormality notification means for notifying an abnormality when the detected current value is larger and / or smaller than the set abnormal current value when the relay unit is on;
An electronic time switch device comprising:   The control unit calculates a load current allowable value based on the number of load devices and stores the load current allowable value in the storage unit; a set load current allowable value set by the load current allowable value setting unit; Load current allowable value comparison means for comparing the detected current value detected by the current detection unit, and when the relay unit is on, the relay unit is turned off if the detected current value is larger than the set load current allowable value The electronic time switch device according to claim 1, further comprising: an overcurrent preventing unit. 3. The electronic time switch device according to claim 1, wherein the control unit includes a number display unit that displays the number of the load devices input by the input unit on the display unit. 4.

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