JPH0655931U - Failure detection device for electric railroad crossing breaker - Google Patents

Abstract

(57) [Abstract] [Purpose] When a failure occurs in the electronic components that make up the motor drive control unit, it can be detected reliably, and moreover, the motor cannot be rotated and the railroad crossing rod cannot be disabled. PROBLEM TO BE SOLVED TO PROVIDE A FAILURE DETECTION DEVICE FOR ELECTRIC CROSSING CIRCUITER. [Configuration] The motor is checked when the motor drive power is input, and when the rotation signal of the motor 1 does not occur for a certain period of time, or when the current of the motor 1 becomes larger than the rated value because the motor cannot rotate, A failure detection unit 11 and a relay 18 that detect that the electronic component that constitutes the drive control unit 2 has failed are provided. The contacts R ₁ and R ₂ of the relay 18 that recovers when a failure is detected and shuts off the current of the motor 1 are connected in series to the output circuit of the inverter unit 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a failure detection device for an electric railroad crossing breaker.

[0002]

[Prior art]

 FIG. 4 shows a drive circuit diagram of a DC brushless motor of a conventional railroad crossing breaker, in which the motor 1 is composed of blocks of a motor drive control unit 2 (inverter unit 3, inverter control unit 4, rotation direction control unit). 5, rotation is controlled by the motor rotation detection unit 6 and the rotation speed control unit 10). 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, and if a failure occurs in an electronic component of the electronic circuit, the rotation of the motor 1 will stop and the rail crossing rod will become inoperable depending on the content of the failure. In the worst case There is a risk that the railroad crossing rod will not be lowered 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 becomes locked in one phase and cannot rotate. Further, when the rotation detecting elements 7 to 9 of the motor rotation detecting section 6 are out of order, or when the inverter control section 4 is out of order, the motor 1 cannot rotate.

[0003]

[Problems to be solved by the device]

 Therefore, the present invention solves the above-mentioned conventional problems and can reliably detect when a failure occurs in an electronic component that constitutes a motor drive control unit, and further, the motor becomes unrotatable and the rail crossing stick becomes inoperable. It is an object of the present invention to provide a failure detection device for an electric railroad crossing gate, which can prevent the occurrence of the problem

[0004]

[Means for Solving the Problems]

 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, when the motor drive power is input, the motor rotation check is performed and the motor rotation signal is not generated for a certain period of time. Alternatively, if the motor current exceeds the rated value due to the motor being unable to rotate, a failure detection section and relay are provided to detect that the electronic components that make up the motor drive failure, and recovery is performed when a failure is detected. The contact of the relay that cuts off the motor current is connected in series to the output circuit of the inverter.

According to a second aspect of the present invention, in the electric railroad crossing cutoff device as described above, 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 If the motor drive control unit has a failure detection unit that detects that the electronic components that make up the motor have failed, if the failure detection signal is received from the failure detection unit, the motor is opened. A semiconductor switch that cuts off the current is connected in series to the output circuit of the inverter.

According to a third aspect of the present 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 control is performed when the motor rotation signal is not generated for a certain period of time. A failure detection unit is provided to detect that the electronic components that make up the unit are out of order, and a temperature fuse that cuts off the motor current when the motor current exceeds the rated value due to the motor not being able to rotate prevents the inverter fuse from being cut off. It is connected in series to the output circuit of.

[0007]

[Action]

 If the electronic components that make up the motor drive control unit fail, the motor rotation signal will not be generated.However, when the motor drive power is being input, the motor rotation is checked and the motor rotation signal such as this remains for a certain period of time. If it does not occur, or if the motor current exceeds the rated value due to the motor not being able to rotate, the failure detector detects the 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 case of, the current of the motor is cut off by melting the thermal fuse. As a result, the railroad crossing rod will be lowered by its own weight and will block the railroad crossing.

[0008]

【Example】

 FIG. 1 is a circuit diagram showing a failure detecting device according to an embodiment of the present invention. In this embodiment, the same parts as in FIG. 4 of the related art are designated by the same reference numerals. Reference numeral 11 denotes a failure detection unit provided in the motor drive control unit 2. The failure detection unit 11 detects a failure of an electronic component forming the motor drive control unit 2, that is, a failure of rotation of the motor 1. There is. 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 checking information 15 and the motor drive power supply in the motor control condition input to the inverter unit 3 in the railroad crossing breaker are input. When the rotation check of the motor 1 is performed by the motor rotation check information 16 that is input to the rotation speed control unit 10 and part or all of the rotation signals (U, V, W phases) are not generated for a certain period of time. , 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 logic unit 12 determines that the failure has occurred. As a result, the failure detection unit 11 displays the failure on the failure display unit 13, while the failure detection output 19 causes the centralized monitoring device 20 to display the failure on a maintenance area (not shown).

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 for the motor 1. The relay contacts R ₁ and R ₂ are conducting when the electronic circuit is normal, the motor 1 is rotated by the output of the inverter unit 3, and the crossing interrupter 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, and the relay 18 is restored by the output of the detection unit, and the relay contacts R ₁ and R ₂ are Open to shut off the motor 1 current. 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 detection device according to another embodiment. In this embodiment, the same parts as those in the conventional FIG. 4 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, particularly 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 are opened to cut off the current of the motor 1. 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 according to another embodiment. Also in this embodiment, the same parts as in FIG. 4 of the related art are designated by the same reference numerals. In the figure, f ₁ , f ₂ , and f ₃ are temperature fuses, which are connected in series to the output circuit of the inverter unit 3 to 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, and also displays 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 to melt the temperature fuses f ₁ , f ₂ and f ₃ , and the temperature fuse disconnection condition 22 is satisfied. The error is input to the logic unit 12 of the failure detection unit 11, and the failure display unit 13 displays the failure and the thermal fuse disconnection. When the temperature fuse is blown, the rail of the railroad crossing barrier is lowered by its own weight to block the railroad crossing.

[0012]

[Effect of device]

 Since the inventions of claims 1, 2 and 3 are configured as described above, when a failure occurs in the electronic component that constitutes the motor drive control section, the failure detection section detects the failure by rotation check of the motor or overcurrent detection. It can be reliably detected. In addition, 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 motor lock state, the railroad crossing shutoff rod descends by its own weight, Since the road can be cut off, 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)

[Scope of utility model registration request] 1. An electric level crossing machine comprising a motor for raising and lowering a level crossing rod and a motor drive control unit for controlling the drive of the motor, wherein the motor is rotationally checked when a motor drive power source is input. Provided with a failure detection unit and a relay that detects that the electronic component constituting the motor drive control unit has a failure when the rotation signal of the motor does not occur for a certain period of time or when the motor current becomes larger than the rated value due to the inability of the motor to rotate, A failure detection device for an electric crossing breaker, characterized in that contacts of the relay, which is restored when a failure is detected and cuts off a motor current, are connected in series to an output circuit of an inverter section. 2. An electric railroad crossing cutoff machine comprising a motor for raising and lowering a railroad crossing cutoff rod and a motor drive control unit for controlling the drive of the motor, wherein the motor is rotationally checked when the motor drive power is input. If a motor rotation signal does not occur for a certain period of time or if the motor current becomes larger than the rated value due to the motor being unable to rotate, a failure detection section is provided to detect a failure in the electronic components that make up the motor drive control section. A failure detection device for an electric crossing breaker, characterized in that a semiconductor switch that opens when a failure detection signal is received from the detection section to cut off the motor current is connected in series to the output circuit of the inverter section. 3. An electric railroad crossing interruption machine comprising a motor for raising and lowering a crossing rail and a motor drive control unit for controlling the drive of the motor, wherein the motor is rotationally checked when the motor drive power is input. A failure detection unit is provided to detect that the electronic components that make up the motor drive control unit are malfunctioning when the motor rotation signal does not occur for a certain period of time.Fusing occurs when the motor current exceeds the rated value because the motor cannot rotate. A failure detecting device for an electric crossing breaker, characterized in that a temperature fuse for cutting off the motor current is connected in series to the output circuit of the inverter section.