JPH10157963A - Control device for passenger conveyer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate reverse running of a passenger conveyer causing a stall when power is instantaneously interrupted. SOLUTION: When an up-operating switch 3 is closed, an up-operating electromagnetic contactor 5 is energized, a contact 5a is closed, an electric motor 1 is driven, and a passenger conveyer performs up-operation. In this condition, when a power supply source R, S, T is interrupted, the electromagnetic contactor 5 is held by charged energy of a smoothing capacitor 2B. On the other hand, by power interruption of the electric motor 1, the passenger conveyer is made to run by inertia. When power interrupted is restored in a short time, power is immediately fed to the electric motor 1, and the passenger conveyer continues operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation control device for a passenger conveyor such as an escalator, and more particularly to a control device when an instantaneous power failure occurs.

[0002]

2. Description of the Related Art When an abnormal situation such as a lightning strike occurs in a power supply system, a power company changes the connection of the power supply system. At this time, the power supply system is instantaneously switched,
An instantaneous power outage of about ms occurs. Normally, the passenger conveyor is provided with an electromagnetic contactor for drive control, and in the event of a momentary power failure, the contactor is opened and the contacts are opened, and the passenger conveyor stops. It is necessary to stop the passenger conveyor immediately in an emergency, but in the case of an instantaneous power failure, the passenger conveyor must not stop and the passengers do not fall down.

FIG. 3 is a circuit diagram showing a conventional passenger conveyor control device disclosed in Japanese Patent Application Laid-Open No. 49-87085, for example, which can be automatically started upon recovery from an instantaneous power failure. Now, when the ascending operation switch 3 is turned on in order to operate the passenger conveyor ascending, the ascending operation electromagnetic contactor 5 is energized and self-holds by closing the contact 5b. At the same time, the contact 5a is closed, the electromagnetic brake (not shown) is opened, the electric motor 1 is driven, and the passenger conveyer operates ascending.

Here, when the power sources R, S, T are momentarily cut off, the motor 1 is cut off, and at the same time the electromagnetic contactor 5 for ascending operation is deenergized, and the contact 5a is opened. However, even when the electromagnetic contactor 5 for ascending operation is deenergized, the power contacts R, S, and T are restored while the passenger conveyor is rising due to inertia due to an instantaneous power failure because the relay contact 11 is closed for a certain period of time. When the power is turned on, the ascending operation electromagnetic contactor 5 is re-energized in the circuit of R-7-11-6c-5-S, the power is supplied to the electric motor 1, and the passenger conveyor continues the ascending operation. The same applies to the descent operation.

[0005]

In the conventional passenger conveyor control device as described above, the self-holding circuits of the electromagnetic contactors 5 and 6 for driving the electric motor 1 have time relay contacts 11 and 12 respectively.
Therefore, if the set time limit of the timed relay contact 11 is long, there is a problem that the ascending traveling due to the inertia may end and the vehicle may reverse. When the stop push button 7 is pressed in a normal operation and the stop push button 7 is returned after a short time, the electromagnetic contactors 5 and 6 are not deenergized due to the timed relay contacts 11 and 12, so that the passenger conveyor stops. There is also a problem that it may be hindered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to prevent reverse rotation of a passenger conveyor due to an instantaneous power failure and to prevent inability to stop due to a short-time operation of a normal stop push button. An object of the present invention is to provide a passenger conveyor control device.

[0007]

According to a first aspect of the present invention, there is provided a passenger conveyor control device which operates only when a power supply fails.
An electromagnetic contactor for driving an electric motor is temporarily held.

Further, in the passenger conveyor control device according to the second invention, a temporary holding device for supplying power to the electromagnetic contactor for driving the electric motor only at the time of power failure of the power supply is provided in the power supply conversion device.

[0009] A passenger conveyor control device according to a third aspect of the present invention is the passenger conveyor control device according to the second aspect of the present invention, wherein the power supply conversion device includes a converter, a capacitor, and an inverter, and uses the capacitor as a temporary holding device. is there.

A control apparatus for a passenger conveyor according to a fourth aspect of the present invention is the control apparatus for a passenger conveyor according to the second aspect of the present invention, wherein the power supply conversion device comprises a converter and a capacitor, and the capacitor is used as a temporary holding device.

According to a fifth aspect of the present invention, there is provided a passenger conveyor control device according to the second to fourth aspects, wherein the provisional holding time of the electromagnetic contactor is set so that the electric motor of the passenger conveyor is cut off when the rated load of the passenger conveyor is increased. This is set to be shorter than the time from when the power is applied to when the power is reversed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a circuit diagram according to the first to third and fifth aspects of the present invention. In the figure, R, S, and T are power sources, 1 is an electric motor for driving a passenger conveyor such as an escalator, 2 is a power converter connected to the power sources R and S, and a converter 2A that converts AC to DC. Smoothing capacitor 2B and inverter 2C for converting DC to AC
And a control unit 2D that controls the inverter 2C.

3 is an ascending operation switch, 4 is a descending operation switch, 5 is an ascending operation electromagnetic contactor, 5a and 5b are normally open contacts, 5c is a normally closed contact, and 6 is a descending operation electromagnetic contactor. , 6a and 6b are normally open contacts, 6c is a normally closed contact, 7 is a stop push button, each of the devices 2 to 7 constitutes a control circuit, and the smoothing capacitor 2B constitutes a temporary holding device. .

Next, the operation of this embodiment will be described.
When the power sources R, S, and T are normal, the converter 2A of the power converter 2 converts AC to DC, and the capacitor 2B is charged. At the same time, the inverter 2 is controlled by the control unit 2D.
C converts DC into AC and supplies it to the control circuit. Now, the ascending operation switch 3 is used to ascend the passenger conveyor.
Is supplied, the ascending operation electromagnetic contactor 5 is energized, and is held by the closing of the contact 5b. At the same time, the contact 5a is closed and the electromagnetic brake (not shown) is opened, so that the electric motor 1 is driven and the passenger conveyor starts ascending operation. The contact 5c is opened.

When the stop push button 7 is pressed in this state, the ascending operation electromagnetic contactor 5 is deenergized, the contact 5a is opened, and the motor 1 is disconnected from the power sources R, S, T, Since the brake is actuated, the electric motor 1 is braked, the passenger conveyor stops immediately, the contact 5b opens,
The contact 5c is closed. Even if the stop push button 7 is pressed and the stop push button 7 is returned after a short time, the electromagnetic contactor has a high falling speed due to its structure and the contact 5b is immediately opened. The re-electromagnetic brake will not be energized and the passenger conveyor will stop reliably.

Next, when the power supply R, S, T fails while the passenger conveyor is running up, the output of the DC side of the converter 2A is lost, but the smoothing capacitor 2
Since the DC power is supplemented by the energy charged in B, the control power is supplied, and the electromagnetic contactor 5 for ascending operation is supplied.
Is energized. Then, the electric motor 1 is cut off, but the passenger conveyor continues running due to inertia. Therefore, when the power sources R, S, and T recover in a short time, power is immediately supplied to the electric motor 1, and the passenger conveyor can continue to operate.

However, the power outage is prolonged and the smoothing capacitor 2
When the energy of B decreases, the control power is not supplied, so that the ascending operation electromagnetic contactor 5 is deenergized, the electromagnetic brake is operated, and the passenger conveyor stops. In addition, when the passenger conveyor is running due to inertia due to a power failure as described above, especially during ascent operation, there is a possibility that the speed may be stalled by some of the passengers and the vehicle may reverse. By selecting the capacity of the smoothing capacitor 2B so that the electromagnetic contactor 5 for ascending operation deactivates before the passenger conveyor reverses, it is possible to prevent reverse rotation. Further, since the smoothing capacitor 2B of the power supply converter 2 is shared as a temporary holding device, it is economical.

Embodiment 2 FIG. FIG. 2 is a circuit diagram showing one embodiment of the second, fourth, and fifth inventions of the present invention, and the portions denoted by the same reference numerals as those in FIG. 1 indicate the same or corresponding portions. In addition,
The motor circuit portion of FIG. 1 is also used in the second embodiment. This embodiment is obtained by removing the inverter 2C and the control unit 2D from the power supply converter 2 of FIG. 1, and the power supply of the control circuit is a DC power supply.

FIG. 2 is similar in operation to FIG. 1 except that the power supply of the control circuit is direct current, and has the same effect as in FIG. 1. Further, since the inverter 2C and the control unit 2D are not required, the operation is inexpensive. A configuration is possible.

[0020]

As described above, according to the first aspect of the present invention, the electromagnetic contactor for driving the motor is temporarily held only when the power supply is interrupted. The magnetic contactor is de-energized and can be disabled. In addition, unnecessary stoppage due to an instantaneous power failure can be reduced to prevent an accident in which a passenger falls, and a restart operation after power recovery can be eliminated.

Further, in the second invention, a temporary holding device for supplying electric power to the electromagnetic contactor for driving the electric motor is provided in the power supply converter only when the power supply of the power supply is interrupted, so that the same effect as in the first invention is obtained. In addition, the apparatus can be economically configured by sharing the apparatus.

According to the third aspect of the present invention, the power converter is constituted by a converter, a capacitor, and an inverter, and the capacitor is used as a temporary holding device.
The same effect as that of the second invention can be obtained, and by selecting the capacity of the capacitor, it is possible to prevent the passenger conveyor from reversing at the moment of an instantaneous power failure, and it is only necessary to supply the power of the control circuit to the capacitor. As a result, a small and inexpensive configuration can be achieved.

Further, in the fourth invention, the power converter is constituted by a converter and a capacitor, and the capacitor is used as the temporary holding device. Therefore, the same effect as that of the third invention is obtained, and the power converter is provided. It can be configured at low cost.

Further, in the fifth invention, the temporary holding time of the electromagnetic contactor is set shorter than the time from when the electric motor of the passenger conveyor is cut off until the passenger conveyor reverses during the rated load increasing operation of the passenger conveyor. The present invention has the same effect as the third invention, and can further improve the reverse rotation prevention performance of the passenger conveyor at the time of an instantaneous power failure.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing Embodiment 1 of the present invention.

FIG. 2 is a circuit diagram showing Embodiment 2 of the present invention.

FIG. 3 is a circuit diagram showing a conventional passenger conveyor control device.

[Explanation of symbols]

R, S, T power supply, 1 motor, 2 power supply converter, 2A capacitor, 2B temporary holding device (smoothing capacitor), 2C inverter, 3 ascending operation switch,
4 Lowering operation switch, 5 Electromagnetic contactor for ascending operation, 6
Electromagnetic contactor for descent operation, 7 stop push button.

Claims (5)

[Claims] An apparatus for driving a passenger conveyor by driving an electric motor by an electromagnetic contactor, comprising: a temporary holding device for temporarily holding the electromagnetic contactor only when a power supply of the power supply is interrupted. Control device. 2. An apparatus for operating a passenger conveyor by connecting an electromagnetic contactor to a control power supply supplied via a power supply conversion device connected to a motive power supply and driving a motor by the electromagnetic contactor. A control device for a passenger conveyor, further comprising a temporary holding device provided in the device and for supplying power to the electromagnetic contactor only when the power supply of the power source is interrupted. 3. A power supply converter comprising: a converter for converting AC to DC; a capacitor connected to the converter; and an inverter connected to the capacitor for converting DC to AC and supplying the AC to an electromagnetic contactor. 3. The passenger conveyor control device according to claim 2, wherein said capacitor is used as a temporary holding device. 4. The power conversion device according to claim 2, wherein the power conversion device comprises a converter for converting AC to DC, and a capacitor connected to the converter, and the capacitor is used as a temporary holding device. Control device for passenger conveyor. 5. The provisional holding time of the electromagnetic contactor is set shorter than the time from when the electric motor of the passenger conveyor is turned off until the passenger conveyor reverses during the rated load operation of the passenger conveyor. The control device for a passenger conveyor according to any one of claims 2 to 4.