KR20240093056A - Motor Control Module which is able to detect the electric trouble of the interior electromagnetic element`s contact point and recovery the electric trouble - Google Patents

Abstract

The present invention relates to a motor control panel that is provided between a supply line that supplies power and a load including an electric motor to control the motor, and includes a circuit breaker that is coupled to the inside of the main body of the motor control panel to block the line through which the power of the supply line enters. or an electromagnetic component having a contact point including an electromagnetic contactor that is electrically connected to a circuit breaker to open and close the contact point; a terminal block provided in the main body to be electrically connected to the electromagnetic component and to be electrically connected to the electric motor; a contact potential detection unit that detects the potential of each contact point of the electromagnetic component; a digital control unit that determines or controls an electrical failure including phase loss, poor connection, or contact arc at any of the contact points based on the potential input from the contact potential detection unit; and a recovery unit provided to supply power from the supply line to the electric motor when an electrical failure occurs at any one of the contact points as a result of the determination of the digital control unit.
When power is supplied to an electric motor, electrical failures including loose bolts of electronic components, phase loss due to disconnection, poor connection, or contact arcing can be detected by contact point (node) by distinguishing them from overcurrent. Even in the event of a failure, power can be stably supplied to the motor. It is possible to prevent a gap in the power supplied to the motor.

Description

Motor control module which is able to detect the electric trouble of the interior electromagnetic element`s contact point and recovery the electric trouble}

The present invention relates to an electric motor control panel capable of detecting electrical failures at each contact point of internal electromagnetic components and recovering electrical failures. More specifically, the present invention relates to a motor control panel capable of detecting electrical failures at each contact point of internal electromagnetic components, and more specifically, to contact points in the event of an electrical failure including phase loss, poor connection, or contact arcing of electromagnetic components coupled inside the control panel. About a motor control panel that detects electrical faults by (node), detects electrical faults at each contact point of the internal electromagnetic components, and recovers electrical faults, with an improved structure so that power can be supplied to the motor on the load side according to the fault and can be quickly restored. will be.

There are various types of essential elements to lead our lives and operate industrial facilities. Among these essential elements, electricity is included, which supplies power to various electronic devices and facilities.

In other words, electricity plays an important role in our lives. Electricity is an essential and important resource in human life. In addition, with the emergence of the 4th Industrial Revolution, in which data becomes a very important element, the quality of power and the supply of power without power gaps have become important.

A variety of electromagnetic products can be operated through the supply of electricity, and one of these electromagnetic products is an electric motor, which is a mechanical device that converts the supplied electric energy into rotational movement, which is mechanical energy, using the phenomenon of electromagnetic induction. .

In other words, one of the products in which power supply is important is an electric motor. Electric motors are used as a representative load in power use. Electric motors can be the backbone of production facilities and safety devices such as drainage pumps.

In addition, equipment that controls electric motors in power facilities is generally called a motor control panel, and this motor control panel can safely shut off the motor in the event of overcurrent, phase loss, or connection failure. It also plays a role in operating the electric motor.

The motor can be controlled when a problem occurs by detecting the amount of current in the motor control panel, but the load power is cut off by the overcurrent relay even for problems such as phase loss, poor connection, or contact arc, so it is important for safety and operation of companies or factories, etc. A halt in operation causes enormous damage.

For example, each building has a pump room, usually located in the basement. It plays an important role in operating the pump in response to fire accidents and other accidents. It is desirable to cut off power due to overcurrent, but if the motor is cut off due to phase loss or poor connection, the fire pump cannot operate in the event of an emergency, making it difficult to extinguish the fire in the early stage. Another example is that many electric motors are included in the production lines or manufacturing facilities of various factories. While production facilities are in operation, if any one motor fails to operate due to a phase loss due to a simple loosening of a bolt connected to a circuit breaker or switch contact inside the motor switchboard, the operation of the front and rear facilities will be halted during line production.

In other words, if the entire production line stops operating due to a phase loss due to a simple loosening of a bolt in the power supplied to one motor, the loss from the company's point of view will be very enormous.

Of course, there are no problems with phase loss, poor connection, or contact arcing. When a defect such as phase loss occurs, overcurrent may be induced in all lines except the faulty line, which can be dangerous. However, it would be desirable to detect defects such as phase loss in the first place, recover them in real time, and provide information including audio and visual warnings to the user in real time, as it would be possible to prevent various damages caused by motor stoppage.

[references]

Registered Patent Publication No. 10-0887550 (announced on March 9, 2009)

Registered Patent Publication No. 10-2395570 (announced on May 6, 2022)

The purpose of the present invention is to distinguish electrical failures such as loose bolts of electromagnetic components inside the control panel main body, phase loss due to disconnection, poor connection, or contact arcing from overcurrent in the process of supplying power to the electric motor, and detect them for each contact (node). The aim is to provide a motor control panel that can detect electrical failures at each contact point of internal electromagnetic components and recover electrical failures by stably supplying power to the motor even in the event of a failure, thereby preventing a gap in the power supplied to the motor.

In addition, another object of the present invention is to provide an electric motor control panel that can quickly identify electrical failures at contact points of electronic components inside the control panel body, detect electrical failures at each contact point of internal electromagnetic components, and recover electrical failures simply and conveniently during repair. .

In addition, another object of the present invention is to provide an electrical system for each contact point of the internal electromagnetic components that can effectively provide audio and visual information to the user about electrical failures including phase loss, poor connection, or contact arcing of the contact points of the electronic components inside the control panel main body. The aim is to provide a motor control panel capable of detecting faults and recovering electrical faults.

The purpose of the present invention is to provide a motor control panel that is provided between a supply line that supplies power and a load including an electric motor to control the motor, and is coupled to the inside of the main body of the motor control panel to block the line through which the power of the supply line enters. An electromagnetic component having a contact point including a wiring breaker or an electromagnetic contactor that is electrically connected to the wiring breaker to open and close the contact point; a terminal block provided in the main body to be electrically connected to the electromagnetic component and to be electrically connected to the electric motor; a contact potential detection unit that detects the potential of each contact point of the electromagnetic component; a digital control unit that determines or controls an electrical failure including phase loss, poor connection, or contact arc at any of the contact points based on the potential input from the contact potential detection unit; This is achieved by a motor control panel including a recovery unit provided to supply power from the supply line to the motor when an electrical failure occurs at any one of the contact points as a result of the determination of the digital control unit.

Additionally, it is preferable that the digital control unit ensures that the supply line power is supplied to the terminal through the recovery unit.

In addition, it is preferable to further include a fault recovery unit that determines whether an electrical failure has occurred in the recovery unit.

In addition, the recovery unit preferably includes a first recovery unit and a second recovery unit electrically connected so that the supply line is supplied to the terminal when a failure occurs in the first recovery unit.

In addition, the digital control unit includes an audio-visual unit including a light-emitting unit, a flashing unit, or an alarm unit capable of providing audio-visual information about the location of a failed contact or an operating state of the recovery unit based on the results of the contact potential detection unit. It is desirable to do so.

In addition, it is preferable to further include a circuit breaker that cuts off the circuit between the electromagnetic components when the digital control unit determines that there is an electrical failure.

In addition, it is preferable that the electromagnetic component, EOCR, is further included at the rear end of the electromagnetic contactor, and when the digital control unit determines that the electromagnetic contactor is opened by a trip signal generated from the EOCR, the recovery unit does not operate.

Additionally, if the digital control unit determines that a contact point of the electromagnetic component coupled to the supply line has an electrical failure, it is preferable that the recovery unit does not operate.

According to the present invention, in the process of supplying power to the electric motor, electrical failures such as loose bolts of electromagnetic components inside the control panel body, phase loss due to disconnection, poor connection, or contact arc can be detected for each contact (node) by distinguishing them from overcurrent. In addition, power can be stably supplied to the motor even in the event of a breakdown, and a motor control panel capable of detecting electrical failures at each contact point of internal electromagnetic components and recovering electrical failures can be provided, which can prevent a gap in the power supplied to the motor.

In addition, it is possible to provide an electric motor control panel that can quickly identify electrical failures at the contact points of electronic components inside the control panel body and easily and conveniently detect electrical failures at each contact point of the internal electromagnetic components and repair electrical failures during repairs.

In addition, an electric motor capable of detecting and recovering electrical faults at each contact point of internal electromagnetic components, which can effectively provide audio and visual information to users about electrical faults, including phase loss, poor connection, or contact arcing, of contact points of electronic components inside the control panel body. Control panel can be provided.

1 is a conceptual diagram of an electric motor control panel according to the direct-on-line starting method of an electric motor according to an embodiment of the present invention;
Figure 2 is a block diagram of Figure 1,
3 is an example of a sequence control circuit;
4 is a circuit diagram showing an example of a contact potential detection unit;
Figure 5 is a schematic circuit diagram for explaining the digital control unit;
Figure 6 is a circuit diagram for explaining the recovery unit;
Figure 7 is a circuit diagram for explaining the fault detection unit;
Figure 8 is a conceptual diagram of an electric motor control panel according to the Y-delta starting method of an electric motor according to another embodiment of the present invention.

The motor control panel (1000, hereinafter referred to as 'motor control panel') capable of detecting electrical failures at each contact point of internal electromagnetic components and recovering electrical failures according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 8. As follows.

Figure 1 is a conceptual diagram of a motor control panel according to the direct-on-line starting method of an electric motor according to an embodiment of the present invention, Figure 2 is a block diagram of Figure 1, Figure 3 is an example of a sequence control circuit, and Figure 4 is a contact potential detection unit. It is a circuit diagram showing an example of, FIG. 5 is a schematic circuit diagram for explaining the digital control unit, FIG. 6 is a circuit diagram for explaining the recovery unit, FIG. 7 is a circuit diagram for explaining the failure detection unit, and FIG. 8 is a circuit diagram for explaining the present invention. This is a conceptual diagram of an electric motor control panel according to the Wydelta starting method of an electric motor according to another embodiment of.

Before explaining the present invention in more detail, since the present invention can make various changes and take various forms, implementation examples (or embodiments) will be described in detail in the text. . However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention.

In each drawing, the same reference signs, especially the tens and ones digits, or the same tens, ones, and alphabets indicate members having the same or similar functions, and unless otherwise specified, each of the drawings The member indicated by the reference sign can be understood as a member that complies with these standards.

In addition, in each drawing, the components are expressed exaggeratedly large (or thick), small (or thin), or simplified in size or thickness in consideration of convenience of understanding, etc., but as a result, the scope of protection of the present invention is interpreted as limited. It shouldn't be.

The terms used in this specification are merely used to describe specific implementation examples (sun, aspect, aspect) (or examples), and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as ~include~ or ~consist of~ are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

As shown in FIGS. 1 to 7, the electric motor control panel 1000 according to an embodiment of the present invention is provided between a supply line that supplies power and a load including the electric motor 1800 to control the electric motor, A wiring breaker 1210 that is coupled inside the main body (not shown) of the motor control panel 1000 to block the line through which the power of the supply line is input, or an electromagnetic contactor ( an electromagnetic component 1200 having contact points (A' to 'O') including 1230); a terminal block 1300 provided in the main body to be electrically connected to the electromagnetic component 1200 and the electric motor 1800; a contact potential detection unit 1400 that detects the potential of each contact point of the electromagnetic component 1200; Based on the potential input from the contact potential detection unit 1400, a digital device determines or controls electrical failures including phase loss, poor connection, or contact arc (hereinafter referred to as “phase loss, etc.” as necessary) at any of the contacts. a control unit 1500; If an electrical failure occurs at any one of the contact points as a result of the determination of the digital control unit 1500, it is preferable to include a recovery unit 1600 that is provided to supply power from the supply line to the electric motor.

Although not specifically shown, the motor control panel 1000 generally includes a main body (not shown) having a hexahedral-shaped case, a door (not shown) coupled to the case, a switch including various push buttons, and an inlet It is preferable that the secondary side wire for connection to the supply line and the electric motor 1800 is coupled to the terminal block 1300.

The electromagnetic component 1200 may include various known components, but in this embodiment, as shown in FIGS. 1 and 2, the wiring breaker 1210, the electromagnetic contactor 1230, and the electromagnetic contactor 1230 described above are included. The overcurrent relay (1250, hereinafter referred to as 'EOCR') located between the and terminal block 1300 will be described below as an example.

These electromagnetic components 1200 include contacts (sometimes referred to as 'nodes' as needed) provided to be coupled by bolts, etc. to electrically connect input and output wires. 1230, each contact point in FIGS. 1 and 2 is 'A' to 'A' 'O', refer to the parts marked 'A' to 'O' and 'a' to 'l' in FIG. 8) are provided.

The present invention includes cases where the supply line is supplied in a single-phase 2-wire system, a 3-phase 3-wire system, or a 3-phase 4-wire system.

The wiring breaker 1210 serves to cut off power from overcurrent and short circuit. It may be a wiring breaker or, in some cases, an earth leakage breaker.

The magnetic contactor 1230 is a switch used to control the electric motor 1800, and is a switch capable of ‘ON’ and ‘OFF’ control from a sequence control circuit.

The EOCR (1250) determines the amount of current and functions to block the circuit or provide an alarm in connection with the magnetic contactor (1230) in the event of a failure such as overcurrent, overvoltage, phase loss, connection failure, or contact arcing. It is a safety device used along with the circuit breaker (1210) when a circuit abnormality occurs.

In the present invention, the EOCR (1250) does not detect when an electrical failure such as phase loss occurs. This is because power is restored immediately in the event of an electrical failure, such as a phase loss.

The terminal block 1300 is placed inside the main body of the motor control panel 1000 to supply power to the motor 1800. In the present invention, the terminal block 1300 is designed so that when an electrical failure such as a phase loss of the electromagnetic component 1200 occurs, the power supplied from the electric motor 1800 can operate the recovery circuit of the recovery unit 1600. It is a separately connected part.

The ‘sequence control circuit’ in FIGS. 2 and 3 refers to a control circuit for driving the electric motor 1800.

The control power supply unit 1320 is also called ‘SMPS’ and functions to supply power to the control circuit of the present invention.

The contact potential detection unit 1400 serves to monitor the potential of each contact point (or node). The potential of a specific contact point (bolt fastening part) is detected, and in particular, when a phase loss or connection failure occurs, the corresponding contact potential is detected and applied as an input to the digital control unit 1500.

The contact potential detection unit 1400 is composed of a combination of an opamp amplifier and a comparator, as shown in FIGS. 4 and 5. Each output potential of the contact potential detection unit 1400 is input as a bit value to the digital control unit 1500.

The digital control unit 1500 is a control device that operates and processes various input and output data, as shown in FIGS. 2 and 5. The digital control unit 1500 may include a microcontroller. It receives the node potential as a bit from the contact potential detection unit 1400, controls the operation of the first recovery unit 1630, and receives the current value from the fault detection unit 1700, which monitors whether the first recovery unit 1630 operates normally. It receives input as bits. It serves to control the operation of the second recovery unit 1650 according to these input results.

In addition, the specific operation results of the digital control unit 1500 can be displayed in an audio-visual unit including a light emitting means that emits light, a blinking means that blinks light, and an alarm means that generates sound (see 'LCD output' in Figure 5). ). It also has the feature of being able to output not only abnormalities in certain lines but also faults in specific nodes.

The recovery unit 1600 includes a first recovery unit 1630 and a second recovery unit 1650.

The first recovery unit 1630 serves to restore the line of the faulty node when a phase loss or connection failure occurs at a specific node. It may be a single line failure or multiple line failures. Its characteristic feature is that recovery is possible even if a failure occurs in multiple lines or contact points. The first recovery unit 1630 operates in a way that a signal output from the digital control unit 1500 triggers an SCR or a transistor to operate a relay or PLC.

The second recovery unit 1650 serves to replace the function of the first recovery unit 1630 when the first recovery unit 1630 malfunctions. Like the first recovery unit 1630, the main element of the second recovery unit 1650 includes a relay or PLC.

In addition, the recovery power of the first recovery unit 1630 and the second recovery unit 1650 is supplied from the supply line on the primary side of the circuit breaker 1210 and connected to the terminal block 1300.

As shown in FIG. 7, the failure detection unit 1700 operates the first recovery unit 1600 due to a failure of a specific node to supply power to the electric motor 1800, thereby restoring the first recovery unit 1630 to normal. It monitors the status and, if there is an abnormality in the first recovery unit 1630, informs the digital control unit 1500 of the operation of the first recovery unit 1630. The digital control unit 1500 may operate the second recovery unit 1650 based on the abnormal signal received from the failure detection unit 1700.

The operating principle of the motor control panel 1000 according to the present invention having this configuration will be described with reference to FIGS. 1 to 6 as follows.

<First Example>

First, the starting of the electric motor 1800 will be explained by taking the case of direct-on-line starting as an example.

In the present invention, the direct-on-line starting method of the electric motor 1800 of this embodiment and the Y-delta starting method of the 'second embodiment' described later are used as examples, but the present invention is not limited to this method.

As shown in FIG. 1, the direct-on-line starting method is to start and operate the motor 1800 by directly applying the connected rated voltage to the motor 1800 when starting operation in a stopped state. It is mainly used for small-sized motors or high-capacity motors. This method is used in electric motors.

Since the capacity of the electric motor 1800 is relatively small, the initial starting current can also be considered relatively small, so power is applied to the electric motor 1800 as is without a process of limiting the initial current. The structure is simple and it is easy to utilize the space inside the main body.

In the conventional direct-on-start motor control panel, when a phase loss, poor connection, contact arc, overcurrent, overvoltage, or short circuit occurs, the circuit is immediately blocked if a certain amount of current is exceeded, or if a failure occurs for more than a set time. Breaking of these circuits is possible by EOCR.

Here, EOCR measures the amount of current to determine whether there is overcurrent, and when overcurrent or short circuit occurs, it is desirable to quickly cut off the power supply to the motor 1800 because there is a circuit abnormality in the motor 1800 or the line.

Even in the prior art, it is very dangerous if a phase loss, connection failure, or contact arc occurs in the power supplied to the motor 1800. When an electrical failure such as phase loss occurs when using a three-phase motor, overcurrent is induced in the remaining lines that have not lost phase, etc. Although it varies depending on the size and situation of the load, if a phase loss occurs in a three-phase motor, it can lead to damage to the motor or a fire. Therefore, electrical failures such as phase loss can be said to be very dangerous, just like overcurrent.

Accordingly, EOCR detects phase loss as well as overcurrent and safely blocks the circuit. If the circuit is interrupted, electrical accidents that may occur immediately can be prevented, but from another perspective, financial losses and safety issues may occur.

With the advancement of technology, stable power supply has become very important. Of course, power equipment such as electric motors are no exception. With current technology, it is desirable for the circuit to be blocked because both overcurrent and phase loss are dangerous.

Here, it would be desirable to detect electrical failures such as overcurrent and phase loss, cut off the circuit in case of overcurrent, and restore the circuit in real time in case of phase loss, etc., to enable driving of the motor without power gap.

When the electric motor 1800 operates according to the direct-on-line starting method, the operating process of the configuration of the present invention will be described in detail below.

The part where the wires are bolted together so that the power wires are connected in the main circuit of the electronic component 1200 that is supplied with power to the electric motor 1800 is a contact point (see 'A' to 'O' in FIGS. 1, 3, and 7). , In some cases, it is also called a 'node'). For example, parts marked with alphabets in Figures 1 to 3 (including Figure 7) represent contact points (A' to 'O').

If there is no problem - electrical failure (for example, phase loss due to loose bolt, etc.) - at each contact point (A' to 'O'), the electric motor 1800 starts normally.

The main circuit in which power is supplied between the electromagnetic components 1200 may form a closed circuit by the relay contact point B of the first recovery unit 1630. As shown in Figures 1, 5 and 7, the first recovery is between the 'B' node and the 'C' node, the 'G' node and the 'H' node, and the 'L' node and the 'M' node. A circuit is formed with the relay b contact of the unit 1630 (see 'Re1-b', 'Re2-b', and 'Re3-b' in FIG. 7). It is desirable to provide a circuit breaker 1750 that cuts off the main circuit line and switches to a recovery circuit when a phase loss or the like occurs. Here, although it is described as the first recovery unit 1630, the relay b contact can of course also be applied to the second recovery unit 1650 if necessary.

The potential of each node is always monitored by the contact potential detection unit 1400. Here, the power of the electronic circuit for control according to the present invention is supplied from the SMPS, which is the control power supply unit 1320 connected to the main circuit.

Additionally, the contact potential detection unit 1400 can be activated by pressing the ON button (not shown) connected to the sequence control circuit (see FIGS. 2 and 3, no drawing number) of the motor control panel 1000. In addition, since the power applied to the contact potential detection unit 1400 is always supplied, the contact potential detection unit 1400 can detect the potential of each node even when the electric motor 1800 is stopped.

Here, for the sake of explanation, it is assumed that the bolt fastening of the ‘B’ contact point was loose and a phase loss occurred. In a normal state, the output of the inverting amplifier of the contact potential detection unit 1400 as shown in FIG. 3 is output about '5'V, and the output of the inverting amplifier and the contact arc reference potential due to poor connection of the comparator set by the voltage distribution or After comparison, the 'High' signal is finally input as a bit value to the digital control unit 1500.

If a phase loss occurs at the ‘B’ contact, no potential is applied to the ‘B’ or ‘E’ contacts except for the ‘A’ contact. If no potential is received from each contact potential detection unit 1400, the output of the inverting amplifier is ‘0’V, and when this is compared with the reference potential of the comparator, ‘LOW’ is output because the output of the inverting amplifier is lower than the reference potential.

Accordingly, ‘LOW’ is output to all ‘B’ or ‘E’ contacts except for the ‘A’ contact. If this is expressed as a bit value received by the digital control unit 1500, the bits of ‘A’ to ‘E’ become ‘1/0/0/0/0’. The digital control unit 1500 receives the bit value of the ‘L1’ line (see ‘L1’ in FIG. 1) like this and operates a signal.

For example, when a bit value of '1/0/0/0/0' is input as in the previous example, the digital control unit 1500 detects phase loss, poor connection, or contact arc at the 'B' node on 'L1'. It is determined that has occurred. At the same time as the judgment, the digital control unit 1500 triggers the SCR of the first recovery unit 1630 to excite 'Re1' (the relay in charge of the first recovery unit 'L1' line, see Figures 6 and 7) to activate the 'L1' line. Recover.

At the same time as the recovery power is input to the recovery line of the recovery unit 1600, the line 'L1' of the main circuit where the problem occurred is connected to the b contact of the first recovery unit 1630 between the 'B' node and the 'C' node (FIG. 7 It is safely blocked by (see 'Re-1b' in ). This is because leaving a line with a problem as is can cause continuous arcing, so it is desirable to block the line of the main circuit where the problem occurred when a problem occurs.

At the same time as the ‘L1’ line is restored, an alarm sounds that a phase loss has occurred on the ‘L1’ line (see ‘Bz1’ in Figure 6).

In this way, the digital control unit 1500 can identify and detect the node in which a failure occurred, and thus visually output the image of the ‘B’ node on a display, which is an example of an audio-visual unit provided in response.

Meanwhile, power can be supplied from the recovery unit 1600 according to the present invention overwhelmingly faster than the time (several seconds) at which the EOCR determines overcurrent or phase loss. Accordingly, the EOCR recognizes the circuit as a normal state even in the event of an electrical failure such as phase loss according to the present invention and does not block the circuit. The circuit that supplies power to the electric motor 1800 is immediately restored and the electric motor 1800 operates without any problems.

Here, if the first recovery unit 1630 does not restore the circuit even though a phase loss or connection failure occurs in the 'B' node, a failure signal of the first recovery unit 1630 is detected by the failure detection unit 1700, which was monitoring the circuit. It is applied to the digital control unit 1500.

That is, as shown in FIG. 7, current flows in the first recovery unit 1630 through a current detection sensor capable of detecting the current between 'L1-1' and 'L1-2' of the first recovery unit 1630. can be detected. Here, a CT, Hall sensor, shunt resistor, etc. may be used as the current sensing sensor.

Based on the detection result of the failure detection unit 1700, the digital control unit 1500 can recognize whether the first recovery unit 1630 is broken. When the digital control unit 1500 determines that the first recovery unit 1630 is broken, it quickly triggers the SCR of the second recovery unit 1650 to excite ‘Re4’. In an instant, ‘Re4’ of the second recovery unit (1650) is replaced with ‘Re1’ of the first recovery unit (1630) to restore power to the ‘L1’ line. In this case, as previously explained, a phase loss on the ‘L1’ line can be alerted at the same time that the ‘L1’ line is restored, and a visual or auditory alarm that the ‘B’ node has lost a phase is also possible.

This process allows restoration of the line supplied to the electric motor 1800 even if phase loss occurs simultaneously in a line containing multiple contact points. Since the ‘L1’ phase, ‘L2’ phase, and ‘L3’ phase are each detected individually, not only is the potential detected individually, but power recovery is also possible individually.

If problems such as overcurrent or overvoltage other than phase loss, poor connection, or contact arc occur, the contact potential detection unit 1400 detects the node potential as in the normal state. That is, in the case of an electrical failure such as overcurrent or overvoltage caused by factors other than the phase loss of the 'B' contact point assumed above, the bit value input from the contact potential detection unit 1400 to the digital control unit 1500 is '1/ It becomes '1/1/1/1'.

According to these bit values, the digital control unit 1500 determines that no electrical failure, such as phase loss, has occurred in the contacts (A' to 'O'). Accordingly, since the first recovery unit 1630 and the second recovery unit 1650 do not operate, the power supply circuit to the electric motor 1800 is safely cut off by EOCR.

At the same time as the circuit is blocked, an external interrupt is generated in the digital control unit 1500 by a trip signal generated from the EOCR, as shown in the ‘sequence control circuit’ of FIG. 3. When an external interrupt occurs, the digital control unit 1500 processes the external interrupt with priority. In this case, the digital control unit 1500 stops work including all previously performed controls and simultaneously excites ‘Re7’ from the ‘PE6’ terminal. When the EOCR (1250) trips, the electromagnetic contactor (1230) opens. Since the digital control unit 1500 may mistake the opening of the electromagnetic contactor 1230 due to an EOCR (1250) trip as a phase loss, the recovery unit 1600 operates when the electromagnetic contactor 1230 is opened due to an EOCR (1250) trip. It is preferable that the digital control unit 1500 controls the recovery unit 1600 not to operate so as to prevent the circuit from being restored.

For this reason, power recovery can be prevented through a process called EOCR (1250) overcurrent trip by the b contact (see ‘Re-7 b’ in FIG. 6) formed by exciting ‘Re7’ in the digital control unit (1500). Then, an alarm or notification that the circuit has tripped due to overcurrent is displayed or output on the digital control unit 1500.

In addition to EOCR (1250), THR is also used to a large extent, and the operation method can be applied in the same way. Although the explanation was made assuming that the faulty node was the ‘B’ node, the same process as described above also goes through when a fault occurs in the remaining nodes (‘A’ node, ‘C’ node, or ‘O’ node).

On the other hand, in addition to the opening of the electromagnetic contactor 1230 due to the EOCR 1250 trip, there is a situation in which the digital control unit 1500 may mistakenly believe that an electrical failure of a phase loss, poor connection, or contact arc has occurred in the main circuit. For example, this is the case when someone randomly presses the ‘OFF’ button to stop the electric motor (1800).

Although the magnetic contactor 1230 is opened according to a normal process, the contact potential detection unit 1400 always monitors or detects the potential of the contact point, so the opening of the magnetic contactor 1230 may be mistaken for a phase loss. In this case, in the present invention, when the electric motor 1800 is ‘OFF’, the digital control unit 1500 can prevent it from determining that it is an electrical failure such as a phase loss at at least one contact point. In FIG. 5, the digital control unit 1500 determines the potential of the ‘OFF’ point indicated in the sequence control circuit. As a result of the judgment, if the ‘OFF’ potential is applied to the digital control unit 1500, the digital control unit 1500 recognizes it as a normal situation.

This is explained in more detail as follows. If a phase loss occurs at the ‘B’ node of the ‘L1’ line, the bit value received by the digital control unit (1500) is 1/0/0/0/0 (unit of 5). Here, the 'OFF' potential is judged together, so stopping the motor (1800) by the 'OFF' button is a normal situation, and the bit value is calculated as '0/1/0/0/0/0' (6 units). In this case, it can be judged to be a normal situation. In other words, if the bit position of the ‘OFF’ signal is ‘0’, power recovery is not performed, and if the bit position of the ‘OFF’ signal is ‘1’, power recovery is performed. For example, the digital control unit 1500 determines that the bit value ‘0/1/0/0/0/0’ is a normal situation, and ‘1/1/0/0/0/0’ is an abnormal situation. For convenience of explanation, only the ‘L1’ line is given as an example, but the operation process is the same for the remaining lines.

However, there is one exception. If a problem occurs in the ‘A’ node, ‘F’ node, or ‘K’ node, the situation is different from the above explanation. The mentioned nodes are contact points connected to the supply line, which is the primary side of the circuit breaker 1210. If a problem occurs in the above three nodes, the circuit will not be restored and an immediate audio and visual alarm will be issued.

To explain in detail, it is as follows. Assume that the ‘A’ node is lost due to insufficient bolt fastening. The contact potential detection unit 1400 detects the potentials of all ‘A’ nodes to ‘E’ nodes as ‘LOW’. The bit value is input as ‘0/0/0/0/0’ from the contact potential detection unit 1400 to the digital control unit 1500.

When the above bit value is input from the digital control unit 1500, the first recovery unit 1630 does not generate a trigger signal and immediately notifies the display device of the ‘A’ node failure.

In this case, since the line cannot be restored, the circuit is safely blocked by EOCR and an alarm sounds immediately. Although the circuit is blocked by EOCR, a failure indication of ‘A’ node is displayed on the display device, allowing immediate action by the manager. Since the location of the fault node can be accurately detected and output, it is very easy to manage the motor control panel (1000). Likewise, the same applies when the ‘F’ node or ‘K’ node loses phase.

The power vacuum mentioned above can be directly linked to enormous losses for a company or industry. In addition, important fire-fighting facilities such as drainage pumps in the building's basement may not operate immediately due to reasons such as phase loss or poor connection. This is not desirable in case of an emergency. Accordingly, through the technical idea of the present invention, safe and rapid power restoration is possible for phase loss and connection failure, thereby preventing corporate losses and long-term safety accidents.

<Second Embodiment>

As shown in FIG. 8, another motor control panel 2000 of the present invention applies the Y-delta starting method of the motor 2800. The operating principle in this embodiment is also the same as the detection principle in the direct-on-line starting method described above. The difference from the direct-on-line starting method is that the circuit is divided into two parts for detection.

Reference numbers not described below are understood to have the same configuration if the hundreds, tens, days, and English branch numbers are the same as the reference numbers in the previous embodiment.

As shown in FIG. 8, the wye-delta starting method can selectively apply wye connection and delta connection from two or more electromagnetic contactors (2200b). This Wi-Delta connection is a starting method mainly used when the capacity of the electric motor (2800) is large. Because the capacity of the electric motor (2800) is large, a relatively large amount of current is required compared to the direct-on starting method.

In particular, since the motor 2800 has a very large starting current for a few seconds after the initial power is turned on, using it in a direct-on-line starting form may cause strain to the motor. Therefore, in many cases, the Wydelta starting method is used. Starting with the wye connection method allows starting with an initial current amount that is 1/3 times lower than with the direct starting method. For this reason, the starting current is lowered for a few seconds using a wye connection to protect the motor 2800 from the initial starting current, and when it enters a stable state, the wye connection is converted to a delta connection to start.

The operating principle of the Wydelta starting method is also the same as that of the direct-on-line starting method, so the same content as the direct-on-line starting method will be omitted and explained.

In the Wydelta starting method, unlike the direct-on-line starting method, the circuit is separated into two and detected. For example, as shown in Figure 7, lines written in uppercase letters (see 'A' to 'O' in Figure 7) and lines written in lowercase letters (see 'a' 'l' in Figure 7) are detected separately. do.

When the ‘ON’ button (not shown) of the sequence control circuit of the motor control panel 2000 is pressed, the contact potential detection unit 2400 performs detection.

In this embodiment as well, the power applied to the contact potential detection unit 2400 is always supplied, so the potential of each contact point in the contact potential detection unit 2400 is always detected even when the electric motor (not shown) is stopped.

As previously explained, in this embodiment as well, it is assumed that the ‘B’ node loses phase due to a disconnection.

The recovery process is the same as the direct-on startup method of the previous embodiment, so it is omitted. The recovery line of the recovery unit 2600 related to the uppercase node circuit is connected to the terminal block 2300 directly connected in series. Therefore, the recovery power by the first recovery unit 2630 or the second recovery unit 2650 is supplied to the electric motor 2800 through the corresponding terminal block 2300. This is the same as the direct-on startup method.

Next, unlike the direct-on-line starting method, assume that a phase loss occurred at node ‘a’. ‘a’ and ‘C (capital letter)’ are tied in common. Among these, assuming that phase loss occurred only in ‘a’, the recovery circuit is connected to the terminal block 2300 directly connected to the lowercase letter node through the same process as above. Recovery power is supplied to the electric motor 2800 through the terminal block 2300 by the first recovery unit 2630 or the second recovery unit 2650 through the connected circuit.

If a phase loss occurs simultaneously in the 'a' node and the 'C' node, each circuit can independently detect each phase loss in both the terminal block 2300 directly connected to the uppercase node and the terminal block 2300 directly connected to the lowercase node. Restoration power is applied to the line.

As such, since the operating principle in the direct-on-line starting method and the principle in the Y-delta starting method are the same, the content explained in the example of the direct-on-line starting method has been omitted in the example of the Y-delta starting method. Additionally, the present invention is applicable to all starting methods other than the two starting methods described as examples above. To facilitate understanding, only two examples are provided.

As explained above, at a time when stable power supply to electric power facilities has become more important than several years ago, a method to minimize power gaps in the operation of electric motors was needed.

In the prior art, phase loss, poor connection, or contact arc could only be viewed as dangerous phenomena. For this reason, even if a phase loss occurred, the circuit had no choice but to be blocked, as in the case of overcurrent. Phenomena such as insufficient bolt fastening, which causes phase loss, can cause the motor to stop and cause enormous economic loss to the company. In addition, in emergency situations that require immediate response, such as a building fire due to the same problem, the pump may not run due to a phase loss, which may pose a major safety risk.

However, according to the present invention, overcurrent, phase loss, poor connection, or contact arc can be detected separately, and it is possible to accurately detect and output not only faulty line detection but also electrical faults such as fault point, i.e. phase loss at each node. In addition, it is equipped with a first recovery unit, enabling real-time line recovery in case of phase loss or connection failure. With respect to the recovery operation of the first recovery unit, a failure detection unit that can immediately detect whether the first recovery unit is broken may be additionally configured. By detecting this failure detection unit, the second recovery unit to replace the first recovery unit can be immediately operated, thereby enabling a more systematic and stable power supply.

In addition, organic display output is possible by receiving signals from EOCR, and effective audio-visual information is provided by an audio-visual unit including an alarm means and a flashing means that contain various sounds than in the prior art in various electrical failure situations including overcurrent and phase loss. can be provided.

According to the present invention, in the process of supplying power to the electric motor, electrical failures such as loose bolts of electromagnetic components inside the control panel body, phase loss due to disconnection, poor connection, or contact arc can be detected for each contact (node) by distinguishing them from overcurrent. In addition, power can be stably supplied to the motor even in the event of a breakdown, and a motor control panel capable of detecting electrical failures at each contact point of internal electromagnetic components and recovering electrical failures can be provided, which can prevent a gap in the power supplied to the motor.

Another object of the present invention is to quickly identify electrical failures at contact points of electronic components inside the control panel body, and to provide an electric motor control panel capable of detecting electrical failures at each contact point of internal electromagnetic components and recovering electrical failures simply and conveniently during repair.

Another object of the present invention is to detect electrical failures at each contact point of internal electromagnetic components, which can effectively provide audio and visual information to the user about electrical failures including phase loss, poor connection, or contact arcing of contact points of electronic components inside the control panel main body. And a motor control panel capable of recovering from electrical failure can be provided.

Here, one embodiment of the present invention has been illustrated and described, but those skilled in the art will recognize that modifications can be made to this embodiment without departing from the principles or spirit of the present invention. will be. The scope of the invention will be determined by the appended claims and their equivalents.

1000: Motor control panel 1200: Electromagnetic components
1210: Circuit breaker 1230: Electromagnetic contactor
1250:EOCR
'A' to 'O', 'a' to 'l': contact point (node)
1300: terminal block 1320: control power supply unit
1400: Contact potential detection unit 1500: Digital control unit
1600: recovery unit 1630: first recovery unit
1650: Second recovery unit 1700: Breakdown recovery unit
1800: electric motor
Re: relay

Claims (8)

In the motor control panel provided between a supply line that supplies power and a load including an electric motor to control the electric motor,
An electromagnetic component having a contact point including a wiring breaker that is coupled to the main body of the motor control panel to block the line through which the power of the supply line is input, or an electromagnetic contactor that is electrically connected to the wiring breaker to open and close the contact point;
a terminal block provided in the main body to be electrically connected to the electromagnetic component and to be electrically connected to the electric motor;
a contact potential detection unit that detects the potential of each contact point of the electromagnetic component;
a digital control unit that determines or controls an electrical failure including phase loss, poor connection, or contact arc at any of the contact points based on the potential input from the contact potential detection unit;
A recovery unit provided to supply power from the supply line to the motor when an electrical failure occurs at any one of the contact points as a result of the determination of the digital control unit. According to paragraph 1,
An electric motor control panel, wherein the digital control unit allows the supply line power to be supplied to the terminal through the recovery unit. According to claim 1 or 2,
An electric motor control panel further comprising a fault recovery unit that determines whether an electrical failure has occurred in the recovery unit. According to paragraph 3,
The recovery unit includes a first recovery unit and a second recovery unit that makes an electrical connection so that the supply line is supplied to the terminal when a failure occurs in the first recovery unit. According to paragraph 3,
The digital control unit includes an audio-visual unit including a light-emitting unit, a flashing unit, or an alarm unit that can provide audio-visual information about the location of the faulty contact point or the operating state of the recovery unit based on the results of the contact potential detection unit. Features an electric motor control panel. According to paragraph 1,
An electric motor control panel further comprising a circuit breaker that cuts off the circuit between the electromagnetic components when the digital control unit determines that there is an electrical failure. According to paragraph 3,
The electric motor control panel further includes an EOCR, which is the electromagnetic component, at a rear end of the magnetic contactor, and wherein when the digital control unit determines that the magnetic contactor is opened by a trip signal generated from the EOCR, the recovery unit does not operate. According to paragraph 3,
An electric motor control panel, wherein when the digital control unit determines that a contact point of the electromagnetic component coupled to the supply line has an electrical failure, the recovery unit does not operate.

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