JP2647782B2 - Passenger conveyor control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger conveyor control device having a speed control device for controlling an operation speed.

[0002]

2. Description of the Related Art Recently, a two-speed passenger conveyor capable of high-speed operation during a rush hour has been increasing in transportation. In addition to high-speed driving, there is also a demand for performing low-speed driving such that elderly people and infants can use the vehicle safely when it is quiet. To meet such demands, a control device capable of operating at multiple speeds is required.

Conventionally, as a control device for a passenger conveyor of this kind, for example, Japanese Utility Model Application Laid-Open No. 60-16481, Japanese Utility Model Application Publication No.
Japanese Patent Application Laid-Open Nos. 2-16465, 1-14154, and JP-A-3-8692 are known.

FIG. 4 is a control circuit diagram showing a partial block diagram of an example of a conventional escalator control device. In the figure, 1 is a motor for driving the escalator, 2 is a speed control device provided between the motor 1 and its power supply (not shown) to control the speed of the motor 1, and this speed control device 2 It is a variable voltage variable frequency inverter. The speed control device 2 includes a main circuit unit 2a and a control unit 2b. Further, the controller 2b has direction selection terminals F (forward) and R (reverse rotation) and speed selection terminals H (high speed), M (medium speed), and L (low speed). The operation speed corresponding to each speed selection terminal is set in advance.

[0005] 3 is a contactor for ascending operation, 3a and 3b are normally open contacts, and 3c is a normally closed contact. Reference numeral 4 denotes a descending operation contactor, 4a and 4b are normally open contacts, and 4c is a normally closed contact. 5 is an operation direction changeover switch having an ascending operation switch 5a and a descending operation switch 5b for energizing each of the contactors 3 and 4, and 6 is a stop switch for deactivating each of the contactors 3 and 4 to stop the operation. , 7 are safety switches for forcibly stopping the operation in response to a signal from a safety device (not shown).

Reference numeral 8 denotes a speed selection switch connected to a speed selection terminal of the control unit 2b for selecting an operation speed. Reference numeral 9 denotes a power regeneration device connected to the main circuit unit 2a. It is detected that the electric motor 1 is in the regenerative state, and the regenerative electric power is consumed by the resistor. Further, the driving direction changeover switch 5 and the speed selection switch 8 are arranged as shown in FIG.
The following are provided on the operation panel.

Next, the operation will be described. First, when the ascending operation is performed, one of the high, middle, and low speeds is selected by operating the speed selection switch 8, and then the ascending operation switch 5a is turned on by operating the operation direction switch 5.
As a result, the ascending operation contactor 3 is urged, the normally open contacts 3a and 3b are closed, and the normally closed contact 3c is opened. As a result, the voltage and frequency input to the electric motor 1 are controlled by the speed control device 2, and the escalator starts the ascending operation at the selected speed.

When the ascending operation contactor 3 is energized, the normally open contact 3a is closed. Therefore, even if the operation direction switch 5 is returned to the neutral position and the ascending operation switch 5a is opened, the operation is continued. . On the other hand, when stopping the operation, the stop switch 6 is opened to deenergize the ascending operation contactor 3 and open the normally open contact 3a.

On the other hand, when performing the descending operation, one of the middle and low speeds is selected by operating the speed selection switch 8, and then the descending operation switch 5b is turned on by operating the operation direction changeover switch 5. As a result, the descending contactor 4 is urged, the normally open contacts 4a and 4b are closed, and the normally closed contact 4c is opened. As a result, the escalator starts descending operation at the selected speed. Here, if high-speed driving is performed at the time of descent, there is a risk of an accident such as a passenger falling on the lower floor, and high-speed driving (for example, 40 m / min) is permitted only during ascent. When the operation is stopped, the stop switch 6 may be opened as in the case of ascent.

When the load on the passenger increases during the descent operation, regenerative braking is applied and the electric motor 1 generates power. The regenerative power thus generated is consumed by the power regenerative device 9 connected to the speed control device 2.

[0011]

In the conventional escalator control device configured as described above, the regenerative electric power generated during the descent operation is consumed by the electric power regenerating device 9, so that the special electric power regenerating device 9 is used. In addition, there is a problem that the heat generated by the regenerative heat is required, and the whole becomes expensive and energy is wasted.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and does not require a special power regenerating device for regenerative power generated at the time of descent operation. It is an object of the present invention to obtain a passenger conveyor control device capable of saving energy.

[0013]

A passenger conveyor control device according to the present invention is provided with a bypass circuit in parallel with a speed control device between an electric motor and its power supply, and controls the electric motor by the speed control device during ascending operation. The motor is directly connected to a power source via a bypass circuit during the descent operation.

[0014]

According to the present invention, the regenerative electric power from the electric motor is returned to the power supply by bypassing the speed control device during the descent operation, so that a special electric power regenerating device becomes unnecessary.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. FIG. 1 is a control circuit diagram showing a block diagram of a control device for an escalator according to an embodiment of the present invention. The same or corresponding parts as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 3d denotes a normally open contact of the contactor 3 for ascending operation provided for each phase between the motor 1 and the speed controller 2, and 11 denotes a speed control between the motor 1 and its power source. This is a bypass circuit connected in parallel to the device 2, and the bypass circuit 11 has a normally open contact 4 d of the descending operation contactor 4 for each phase.

Next, the operation will be described. First, when performing the ascending operation, as in the conventional example, the speed selection switch 8 is used.
After selecting one of the high, medium, and low speeds by operating the operation direction switch 5, the operation switch 5
Turn on a. As a result, the ascending operation contactor 3
And the normally open contacts 3a, 3b, 3d are closed, and the normally closed contact 3c is opened. As a result, the escalator starts up operation under the control of the speed control device 2 as in the conventional example.

On the other hand, when performing the descending operation, the descending operation switch 5b is turned ON by operating the operation direction changeover switch 5. As a result, the descending operation contactor 4 is biased, the normally open contacts 4a and 4d are closed, and the normally closed contact 4c is opened. At this time, the normally open contact 3d of the ascending operation contactor 3
Is open, the motor 1 is directly connected to the power supply via the bypass circuit 11 without passing through the speed control device 2.

Therefore, the regenerative electric power generated in the electric motor 1 during the descent operation is returned to the power supply. For this reason, the special power regeneration device 9 which was required conventionally becomes unnecessary, and accordingly, the treatment of the regenerative heat also becomes unnecessary, so that the entire control device becomes inexpensive and energy saving can be achieved. Also,
Accidentally selecting high-speed operation during descent operation is prevented,
Safety is improved.

Embodiment 2 FIG. In the first embodiment, the speed selection switch 8 is constituted by three switches. However, the speed selection switch 8 may be constituted by four or more switches. For example, as shown in FIG. 12, the speed may be selected by a voltage change. In this case, for example, by using an operation panel as shown in FIG. 3, an arbitrary operation speed can be selected within a predetermined range.

In each of the above embodiments, the control device for the escalator is shown. However, the present invention can be applied to a control device for a moving walkway as long as it has a certain degree of inclination.

[0022]

As described above, the passenger conveyor control device of the present invention has a bypass circuit provided in parallel with the speed control device between the motor and its power supply, and the motor is controlled by the speed control device during the ascending operation. The motor is directly connected to the power supply via the bypass circuit during the descent operation, so the regenerative power generated in the motor during the descent operation is returned to the power supply, so a special power regeneration device and heat treatment that generates regenerative heat are required. Instead, the whole can be made inexpensive and energy saving can be achieved. In addition, there is an effect that it is possible to prevent a high-speed operation from being erroneously performed during the descent operation and to improve safety.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram showing a block diagram of a control device of an escalator according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a main part of a control device according to another embodiment of the present invention.

FIG. 3 is a front view showing an operation panel of the control device shown in FIG. 2;

FIG. 4 is a control circuit diagram showing an example of a conventional control device for an escalator by using partial blocks.

FIG. 5 is a front view showing an operation panel of the control device of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Speed control device 11 Bypass circuit

Claims (1)

(57) [Claims] 1. A speed control device provided between a motor for driving a passenger conveyor and a power supply thereof for controlling an operation speed, and provided in parallel with the speed control device between the motor and the power supply. The motor is controlled by the speed control device at the time of ascending operation, and the motor is directly connected to the power supply via the bypass circuit at the time of descending operation. Control device for passenger conveyor.