JP2514054Y2 - Failure detection device for electric railroad crossing breaker - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a failure detection device for an electric railroad crossing breaker.

[0002]

2. Description of the Related Art FIG. 4 shows a drive circuit diagram of a DC brushless motor of a conventional railroad crossing interruption machine, in which each block structure of a motor 1 and a motor drive control unit 2 (inverter unit 3,
The inverter control unit 4, the rotation direction control unit 5, the motor rotation detection unit 6, and the rotation speed control unit 10) control the rotation.
Since the rotation control of the motor 1 by the motor drive control unit 2 is known, its description is omitted. Each block configuration is mostly composed of electronic circuits. When a failure occurs in an electronic component of the electronic circuit, the rotation of the motor 1 is stopped and the rail crossing block becomes inoperable depending on the content of the failure. In the worst case, There is a risk that the railroad crossing rod will not descend while it is in the raised state, and will not block the railroad crossing. For example, when two power transistors of the inverter unit 3 simultaneously fail to conduct, the motor 1 is locked in one phase and cannot rotate. Further, the rotation detection element 7 of the motor rotation detection unit 6
The motor 1 cannot rotate when the failure occurs in any one of 9 to 9 and also when the inverter control unit 4 fails.

[0003]

Therefore, the present invention solves the above-mentioned problems of the prior art, and can reliably detect when a failure occurs in an electronic component that constitutes a motor drive control unit.
Moreover, it is an object of the present invention to provide a failure detection device for an electric railroad crossing breaker, which can prevent the motor from becoming unrotatable and the rail crossing rod from becoming inoperable.

[0004]

In order to achieve the above-mentioned object, the invention of claim 1 is such that, in the electric railroad crossing breaker as described above, the motor is rotated and checked when the motor drive power is input. If the rotation signal of is not generated for a certain period of time, or if the motor current becomes larger than the rated value due to the inability of the motor to rotate, the electronic component that constitutes the motor drive control unit determines that there is a failure. The motor drive control unit is provided with a detection unit and a relay in which the contacts R ₁ and R ₂ are connected in series to the output circuit of the inverter unit, and which recovers when a failure is detected by the failure detection unit and shuts off the motor current. ing. The failure detection section outputs a failure detection output to the centralized monitoring device when the failure display section displays the failure.

According to a second aspect of the present invention, in the above-described electric railroad crossing breaker, when the motor drive power is input, the motor is checked for rotation, and when the rotation signal of the motor is not generated for a certain period of time or the current of the motor is changed. Is connected in series to the output circuit of the inverter and the failure detection section that has a logic section and a failure display section that determines that the electronic components that make up the motor drive control section are out of order when the motor drive speed is higher than the rated value. The semiconductor switch S which is opened to cut off the motor current when a failure detection signal is received from the failure detection unit
₁ and S ₂ are provided in the motor drive control unit. The failure detection section outputs a failure detection output to the centralized monitoring device when the failure display section displays the failure.

According to a third aspect of the invention, in the above-described electric railroad crossing breaker, the motor drive control is performed when the motor drive power is input and the motor drive signal is not generated for a certain period of time. The motor current is higher than the rated value because the motor current is connected in series with the failure detection section that has the logic section and the failure display section that determine that the electronic components that make up the section are defective, and the output circuit of the inverter section. In the case, thermal fuses f ₁ , f ₂ and f ₃ which are blown to cut off the motor current are provided in the motor drive control section. The failure detection section outputs a failure detection output to the centralized monitoring device when the failure display section displays the failure.

[0007]

When the electronic component forming the motor drive control unit fails, the motor rotation signal is not generated. However, when the motor drive power is input, the motor rotation check is performed and such a motor rotation signal is detected. If it does not occur for a certain period of time,
Alternatively, when the motor current becomes larger than the rated value due to the inability of the motor to rotate, the failure detection unit detects a failure. Further, in the case of claim 1, the motor current is cut off by the contact of the relay that receives the failure detection signal from the failure detection unit, and in the case of claim 2, the motor current is cut off by opening the semiconductor switch. In the case of, the current of the motor is cut off by melting the thermal fuse. As a result, the railroad crossing rod is lowered by its own weight, and the railroad crossing road is blocked.

[0008]

1 is a circuit diagram showing a failure detecting apparatus according to an embodiment of the present invention. In this embodiment, the same parts as those in FIG. 4 of the related art are designated by the same reference numerals. 11 is a motor drive control unit 2
A failure detecting section provided inside the controller detects a failure of an electronic component forming the motor drive control section 2, that is, a failure of the motor 1 to rotate. The failure detection unit 11 has a logic unit 12 and a failure display unit 13, and the motor drive power supply (inverter power supply) input verification information 15 and the motor drive power supply in the motor control condition input to the inverter unit 3 in the crossing breaker are input. Rotation speed control unit 10
The rotation check of the motor 1 is performed according to the motor rotation check information 16 input to, and the rotation signal (each phase of U, V, W) for a fixed time
Is not generated, or when the current of the motor 1 becomes larger than the rated value due to the inability of the motor 1 to rotate due to the overcurrent detection unit 14 connected to the motor drive power supply (inverter power supply), the overcurrent check is performed. The information 17 is used to check for excessive current, and the logic unit 12 determines that there is a failure. As a result, the failure detection unit 11 displays the failure on the failure display unit 13, while displaying the failure on the maintenance area (not shown) via the centralized monitoring device 20 by the failure detection output 19.

R ₁ and R ₂ are contacts of a relay 18 connected to the failure detection unit 11, and are connected in series to the output circuit of the inverter unit 3 to the motor 1. The relay contacts R ₁ and R ₂ are conductive when the electronic circuit is normal, the motor 1 is rotated by the output of the inverter unit 3, and the level crossing breaker normally moves up and down. When a failure occurs in a component of each electronic circuit, particularly in a semiconductor, it is detected by the failure detection unit 11 as described above, the relay 18 is restored by the output of the detection unit, and the relay contacts R ₁ and R ₂ are opened. Then, the current of the motor 1 is cut off. As a result, the blocking rod of the railroad crossing barrier descends by its own weight to block the railroad crossing.

FIG. 2 is a circuit diagram showing a failure detecting device according to another embodiment. In this embodiment, the same parts as in FIG. 4 of the related art are designated by the same reference numerals. In the figure, S ₁ and S ₂ are semiconductor switches, which are connected in series to the output circuit of the inverter unit 3 to the motor 1. The semiconductor switches S ₁ and S ₂ are conductive when the electronic circuit is normal, the motor 1 is rotated by the output of the inverter unit 3, and the level crossing breaker normally moves up and down. When a failure occurs in a component of each electronic circuit, especially in a semiconductor, the failure is detected by the failure detection unit 11 as described above, and the semiconductor switch S _{1 is} controlled by the semiconductor switch-off control condition 21 as a failure detection signal from the detection unit. S ₂ is interrupting the current of the motor 1 is opened. As a result, the blocking rod of the railroad crossing barrier descends by its own weight to block the railroad crossing.

FIG. 3 is a circuit diagram showing a failure detecting device of still another embodiment. Also in this embodiment, the same parts as those in FIG. 4 of the prior art are designated by the same reference numerals. In the figure, f ₁ , f ₂ , f
Reference numeral ₃ is a temperature fuse, which is connected in series to the output circuit of the inverter unit 3 for the motor 1. If the electronic circuit is normal, the motor 1 normally rotates by the output of the inverter unit 3, and the railroad crossing breaker normally moves up and down. When a failure occurs in a component of each electronic circuit, particularly a semiconductor, it is detected by the failure detection unit 11 as described above. The failure detection unit 11 displays the failure on the failure display unit 13 as in the above-described embodiment, while displaying the failure on the maintenance area (not shown) via the centralized monitoring device 20 by the failure detection output 19. Further, since the motor 1 is in the locked state, a current larger than the normal operating current (rated value) and the slip current flows and the temperature fuses f ₁ , f ₂ and f ₃ are melted, and the temperature fuse disconnection condition 22 fails. Logic part 12 of the detection part 11
Then, the failure display unit 13 displays the failure and the thermal fuse disconnection. When the temperature fuse is blown, the blocking rod of the railroad crossing barrier is lowered by its own weight to block the railroad crossing.

[0012]

Since the inventions of claims 1, 2 and 3 are configured as described above, when a failure occurs in an electronic component constituting the motor drive control unit, the failure is detected by the motor rotation check or the excessive current detection. Can be reliably determined and detected by the logic unit of the failure detection unit, and can be displayed on the failure display unit. Moreover, since the failure detection unit outputs a failure detection output to the centralized monitoring device when the failure display unit displays the failure, it is possible to simultaneously display the failure through the centralized monitoring device in the maintenance area. Repair and maintenance work can be performed quickly. Also, by disconnecting the motor current with a relay contact, a semiconductor switch, or a temperature fuse connected in series to the output circuit of the inverter section, and releasing the locked state of the motor, the railroad crossing rod descends by its own weight, Since it is possible to cut off the road, there is an excellent effect that the fail safe can be secured and the level crossing can be kept safe.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a failure detection device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a failure detection device of another embodiment.

FIG. 3 is a circuit diagram showing a failure detection device of still another embodiment.

FIG. 4 is a drive circuit diagram of a motor of a conventional railroad crossing breaker.

[Explanation of symbols]

1 motor 2 motor drive control unit 3 inverter unit 4 inverter control unit 5 rotation direction control unit 6 motor rotation detection unit 7 to 9 rotation detection element 10 rotation speed control unit 11 failure detection unit 12 logic unit 13 failure display unit 14 excessive current detection Part 15 Motor power supply (inverter power supply) input verification information 16 Motor rotation verification information 17 Overcurrent detection output information 18 Relay 19 Failure detection output 20 Centralized monitoring device 21 Semiconductor switch-off control condition 22 Thermal fuse disconnection condition R ₁ , R ₂ relay Contact S ₁ , S ₂ Semiconductor switch f ₁ , f ₂ , f ₃ Thermal fuse U, V, W Each phase of motor

Claims (3)

(57) [Scope of utility model registration request] 1. A motor (1) for raising and lowering a railroad crossing cutting rod.
And having an inverter part (3) to drive the motor (1)
In an electric crossing breaker equipped with a motor drive control unit (2) to control, the motor (1) is rotationally checked when the motor drive power is input, and the rotation signal of the motor (1) does not occur for a certain period of time. In this case, or when the electric current of the motor (1) becomes larger than the rated value because the motor cannot rotate, the logic unit (1
2) and a failure detection unit (1) having a failure display unit (13)
1) and the contacts R ₁ and R ₂ are connected in series to the output circuit of the inverter section (3), and when a failure is detected by the failure detection section (11), the motor is restored and the current of the motor (1) is cut off. A relay (18) and a motor drive controller (2) are provided,
The failure detection unit (11) outputs a failure detection output (1) to the central monitoring device (20) when the failure display unit (13) displays the failure.
9) A failure detection device for an electric railroad crossing breaker, characterized by being designed to perform 2. A motor (1) for raising and lowering a railroad crossing blocking rod.
And having an inverter part (3) to drive the motor (1)
In an electric crossing breaker equipped with a motor drive control unit (2) to control, the motor (1) is rotationally checked when the motor drive power is input, and the rotation signal of the motor (1) does not occur for a certain period of time. In this case, or when the electric current of the motor (1) becomes larger than the rated value because the motor cannot rotate, the logic unit (1
2) and a failure detection unit (1) having a failure display unit (13)
1) and a semiconductor switch S ₁ , S that is connected in series to the output circuit of the inverter unit (3) and opens when a failure detection signal is received from the failure detection unit (11) to cut off the current of the motor (1). ₂ is provided in the motor drive control unit (2), and the failure detection unit (11) outputs a failure detection output (19) to the central monitoring device (20) when the failure display unit (13) displays the failure. Failure detection device for electric railroad crossing blockers. 3. A motor (1) for raising and lowering a railroad crossing cutting rod.
And having an inverter part (3) to drive the motor (1)
In an electric crossing breaker equipped with a motor drive control unit (2) to control, the motor (1) is rotationally checked when the motor drive power is input, and the rotation signal of the motor (1) does not occur for a certain period of time. In this case, the logic unit (12) and the failure display unit (1) that determine that the electronic component that constitutes the motor drive control unit (2) has failed
3) is connected in series to the output circuit of the inverter unit (3) and the failure detection unit (11) having the motor unit (1), and the current of the motor (1) is blown when the current becomes larger than the rated value because the motor cannot rotate. The temperature fuses f ₁ , f ₂ , f ₃ for cutting off the current of (1) are provided in the motor drive control section (2), and the failure detection section (11) is used when the failure display section (13) displays a failure. A failure detection device for an electric railroad crossing breaker, which is adapted to output a failure detection output (19) to a centralized monitoring device (20).