KR19990050975A - Semiconductor Reduced Phase Control Motor Combined with Y-Electronic Contactor Circuit - Google Patents

Abstract

An object of the present invention is to provide a semiconductor pressure reduction type phase control driving apparatus which can be installed in parallel with a motor driving circuit using a magnetic contactor of Y-Δ connection.

In order to realize this, the present invention provides a semiconductor pressure reduction device on the primary power supply side (motor output terminal: U / V / W) of the motor, and the secondary terminal side of the motor (output terminal of the motor: X / Y). / Z) is equipped with a semiconductor short circuit device. Through this arrangement, it is possible to install in parallel with the driving circuit of the motor using the magnetic contactor of the Y- △ connection. It is an object of the present invention to take a long time to recover when a general semiconductor decompression driving device in operation occurs, which may cause a huge loss in the production process. -△ Automatic switching to the motor drive circuit using the magnetic contactor of the connection has the effect of suppressing the over-current generated by restarting the motor.

The phase control driving apparatus of the semiconductor decompression type may be provided with the same effect even if the voltage and capacity of the motor are different.

Description

Semiconductor Decompression Phase Control Drive Combined with Y- △ Magnetic Contactor Circuit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor pressure reducing phase control driving device having a self-diagnosis function which can be connected to a motor driving circuit using a Y-Δ type magnetic contactor. In the event of a fault, a magnetic switch that can be connected to the Y- △ circuit can realize the effect of automatically switching to a motor drive circuit using a Y- △ type magnetic contactor to suppress the occurrence of overcurrent generated when the motor is restarted. The present invention relates to a semiconductor pressure reduction phase control device to which a diagnostic function is added.

A semiconductor pressure reduction phase control apparatus for a motor.

The semiconductor pressure reducing device of the motor can be started smoothly by reducing the minimum voltage at which the motor can move when the motor is first started, and can appropriately reduce the starting current generated when the motor is started. If a conventional semiconductor decompression starter of a use fails, it takes a long time to recover it, especially if a failure occurs during nighttime operation that the operator's monitoring is neglected. Conventional semiconductor decompression starter has such a problem, it is pointed out that it is inappropriate in a process that requires continuous operation of the process, such as chemical plants.

The present invention has been invented to solve the problems of the prior art as described above, and the present invention is directed to a driving circuit of a motor using a magnetic contactor of the Y-Δ circuit even if a malfunction occurs in the semiconductor decompression phase control starter in operation. It can be operated by automatic switching to prevent long periods of non-operation in the process, and it is a semiconductor decompression phase control driving device with self-diagnosis function.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing of the semiconductor pressure reduction phase control drive apparatus with the self-diagnosis function for motors added with respect to this invention.

2 is a circuit diagram of a conventional semiconductor pressure reduction driving device.

FIG. 3 is a block diagram of a control board for turning on a semiconductor in the semiconductor pressure reducing device related to FIG. 1.

4 is a block diagram of a control board for turning on a semiconductor in the semiconductor short circuit according to FIG. 1.

FIG. 5 is a block diagram illustrating a self-diagnosis circuit for a semiconductor phase control driving apparatus according to FIG. 1.

6 is a control circuit and interlock circuit diagram of a Y-Δ electromagnetic contactor according to the present invention;

<Description of the symbols for the main parts of the drawings>

10: Synchronization of semiconductor phase controller (invention)

10-1: circuit breaker

11: semiconductor pressure reducing phase controller

11-1: semiconductor pressure reducing device 11-2: semiconductor short circuit

11-3, 11-4, 11-5: Magnetic Contactor

12: Main power magnetic contactor 12-1: △ connection magnetic contactor

12-2: Magnetic contactor with Y connection

13: current sensor 14: motor

20: conventional semiconductor actuator

21: semiconductor pressure reducer 22: spare magnetic contactor

23: motor 30: control board of the pressure reducing device

31: Operation signal 32: Power direction semiconductor

33: input terminal 34: decompression circuit

35 feedback circuit 36 oscillation circuit

36-1: square wave circuit 37: synthesized circuit

38: trigger signal circuit 39: output signal terminal

40: control board of the short circuit device 41: operation signal

42: power source semiconductor 42-1: motor direction semiconductor

43: power supply terminal 44: constant voltage feedback circuit

45: switching circuit 45-1: differential voltage sensing circuit

45-2: Trip signal 46: Bridge rectifier

47: circuit circuit 48: motor directional constant voltage feedback circuit

49: motor direction terminal 50: self-diagnosis indicator

51: current sensor 52: current voltage converter

53: operation circuit 54: indicator

55: current voltage input 60: Y- △ control circuit

61: circuit protector 62: switching signal

63: delay timer 63-1: delay timer a contact

64: Y-connected magnetic contactor 64-1: Y-connected magnetic contactor b contact

65: contact a of main power magnetic contactor 65-1: 65

66-1: 66 timer b contact

66: △ Starting timer 67: △ Wiring contactor

68: 11-3, 11-4, 11-5 magnetic contactor

69: operation signal

In order to realize this, the present invention provides a semiconductor pressure reducing device on the primary power supply side of the motor so as to be connected to a motor driving circuit using a Y- △ type magnetic contactor, and a semiconductor short circuit on the secondary terminal side of the motor. In order to prevent the failure of the semiconductor decompression phase control drive by installing the device, the semiconductor decompression phase control drive device is equipped with an indicator having a self-diagnosis function to protect the motor operation state and the over current of the motor.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

1 is a circuit diagram showing a semiconductor pressure reduction phase control driving apparatus with a self-diagnosis function connected to a driving circuit of a motor using a Y-Δ type magnetic contactor in accordance with the present invention. Semiconductor decompression phase control drive with self-diagnosis function added in parallel with the motor drive circuits 12, 12-1, and 12-3 using the circuit breaker 10-1 and the Y- △ type magnetic contactor. Semiconductor type pressure reducing device 11-1, semiconductor short circuit device 11-2, electronic contactor 11-3 for opening and closing the semiconductor pressure reducing device 11-11, 11-5, and 11-5. ) And the indicator 13 and the current sensor 13-1 which can protect the operation state and the overcurrent of the motor, can smoothly drive the motor 14 at low current.

Referring to the circuit diagram of the conventional semiconductor pressure reducing starter 20, when the electromagnetic contactor 22 is installed in parallel in the semiconductor pressure reducing starter 21, the operation pattern of the semiconductor is changed and the motor 23 is changed. The decompression starter of the semiconductor is responsible for starting and stopping of the semiconductor, and the continuous operation can protect the semiconductor decompression device in spite of the ambient temperature in case of sharing with the magnetic contactor 22. However, if the semiconductor decompression device fails, it is recovered. It has a drawback that takes a long time to

The present invention is configured as shown in Figure 1 to prepare for such a semiconductor decompression starter accident, the magnetic contactor (11-3), (11-4) for isolating the power supply so that repairs to the semiconductor decompression starter is possible to operate. ), (11-5) are installed. FIG. 3 is a block diagram for explaining the control board for turning on the silicon rectifier SCR in the semiconductor pressure reducing device 11-1.

When the start signal 31 of the motor is applied, the soft starter circuit 34 combines the voltage level and the delay time through the input / output terminal 33 to supply the power supply and the phase control voltage of the motor side to the feedback circuit 35 to oscillate. The oscillation signal is continuously made and supplied by the circuit 36, and the half wave sine wave is adjusted by the square wave circuit 36-1 to adjust the width and magnitude of the square wave, and then synthesized by the synthesis circuit 37 to produce a silicon rectifier. The silicon rectifier 32 and 32-1 gradually start to turn on the gate trigger signal through the output terminal 39, and then turn on the motor at full voltage proportional to the acceleration time of the motor. do. 4 is a block diagram for explaining a control board for turning on the silicon rectifier SCR in the semiconductor short circuit device 11-2.

The operation signal 41 of the motor is the same as the signal 31, and the switching circuit is operated by the operation signal 41 of the motor while the constant voltage circuit configured as the feedback circuit is always charged through the semiconductor 42 of the power supply stage. When 45 is operated, a constant voltage is applied to the gate of the silicon rectifier 42 of the power supply terminal through the connection terminal 43 so that the constant voltage is completely turned on, and an AC signal is changed into a direct current to the input terminal of the bridge rectifier 46. The positive voltage circuit 48 is circulated through the + terminal via the circulation circuit 47 through the output terminal of the bridge rectifier 46, and the gate of the silicon rectifier 42-1 in the direction of the motor is configured as a feedback circuit. It is connected to the terminal 49 through) is completely turned on.

If the potential difference is generated through the circuit 45-1 which detects the potential difference between the power source silicon rectifier 42 and the motor-stage silicon rectifier 42-1, it is determined that the failure of the cyrilcon rectifier is tripped. The shorting device is protected by tripping the switching circuit 45 through the circuit 45-1. 5 is a block diagram for explaining an indicator having a self-diagnosis function.

The indicator 54 is provided to the calculation circuit 53 through a circuit 52 for converting a current input through the current sensor 51 into a voltage signal in order to protect the operation state of the semiconductor decompression phase control driving device and the motor from overcurrent. If the input is made through the input device 56 for inputting an overcurrent value proportional to the rated current of the motor to be operated and the trip type, the control circuit 55 for operation circuit driving is supplied. Appears at (54), and becomes the output of (62), (69) via the external interlock signal circuit 56. FIG. 6 is a circuit diagram for explaining a control circuit for operating a motor driving circuit composed of a Y-Δ type magnetic contactor.

A control circuit is formed at the rear end of the circuit protector 61. When the switching signal 62 of the Y- △ circuit is turned on, the operation condition of the delay timer 63 becomes counting, the setting time has elapsed, and the timer contact 63-1 is turned on, so that the coil 64 of the electromagnetic contactor for the Y circuit is turned on. In Fig. 1, 12-2) is operated, and the coil 65 of the main power contactor (12: Fig. 1) and the delay timer 66 operate to restart the motor in a low current state. After the elapse of time, the Y circuit is cut off by the timer contact 66-1, and the coil 67 of the Δ circuit magnetic contactor (12-1 in Fig. 1) is operated to completely restart the motor. The normal operation of the semiconductor pressure reducing phase control drive is performed by the relay reel 68 through the contact point 69, and the magnetic contactor for power supply of the semiconductor pressure reducing phase control device (11-3), (11-4), (11-5) ) Is activated and the contact a of (11-5) is used as the enable signal of (11-1) and (11-2).

As described above, the self-diagnostic semiconductor decompression phase control driving device which can be connected to the Y-Δ type magnetic contactor circuit of the present invention is automatically switched to the Y-Δ circuit even if the semiconductor decompression phase control device fails. The process can be operated without prolonged periods of non-operation, and it has a self-diagnosis function to understand the operating state of the motor and protect the motor from overload.

The object of the present invention is to smoothly drive the motor and at the same time to realize low current starting, so if the adopted semiconductor decompression starter breaks down, it takes a long time to recover it. It is an object of the present invention to provide a phase-controlled starting device for semiconductor pressure reduction in which a self-diagnostic function can be applied to a circuit of Y-Δ so as to prevent and simultaneously start low current.

Claims (3)

A semiconductor composed of a semiconductor pressure reduction phase control device 11-1 and a semiconductor short circuit device 11-2 so as to be connected in parallel with the Y-Δ type electromagnetic contactors 12, 12-1, and 12-2. Pressure Reducing Phase Control Motor Drive. A self-diagnostic semiconductor decompression phase control motor drive device comprising a liquid crystal display 13 and a current sensor 13-1 to add a self-diagnosis function to the semiconductor decompression phase control motor drive device 11. A semiconductor pressure reduction phase control motor drive device equipped with a control board (30) and a control board (40) for turning on the silicon rectifier mounted in the semiconductor pressure reduction phase control device (11).