JPH05124787A - Passenger conveyor control device - Google Patents

Abstract

PURPOSE:To prevent an overload to an electric motor when in an overload condition, and prevent a passenger conveyor from being stopped for a long time due to operation of an over-current detector by arranging a circuit to monitor constantly an electric power or an electric current of the electric motor, and restraining users while broadcasting warning or attention when the electric power or the electric current reaches a prescribed value. CONSTITUTION:A monitoring circuit 8B to monitor an electric power or an electric current flowed to the input side of an inverter 100 or an output side driving machine 6 is arranged in an electric power supply circuit, and an overload condition of the driving machine 6, that is, a load condition of an escalator is monitored constantly. When a large number of passengers come on board the escalator and the electric power or the electric current flowed to the driving machine 6 becomes equal to or larger than a preset value, signals from the monitoring circuit 8B are sent to an operation control circuit 8A and a voice or guide display circuit 8C. The voice or guide display circuit 8C regulates the passengers so as to refrain from using the escalator by guiding through voices or a display lamp. On the other hand, when the overload condition is continued for more than a prescribed time, the operation control circuit 8A issues a command to the inverter 100 so as to lower an output frequency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a passenger conveyor which conveys passengers by a plurality of steps arranged endlessly.

[0002]

2. Description of the Related Art Generally, a passenger conveyor such as an escalator rotates a drive gear through a reduction gear by an electric motor,
The step chain wound around this and the steps attached to the step chain are driven to convey passengers.
Generally, a commercial AC three-phase power source is used as a power source of the electric motor, but recently, the AC three-phase power source is used as an input source and driven by an inverter to drive the speed of the motor, that is, the escalator. A proposal has been made to control the speed (Japanese Patent Application No. 61-117321).

[0003]

In the passenger conveyor having the above structure, when a large load is applied to the electric motor in an overload condition in which a large number of passengers board the vehicle, either the inverter power source drive or the commercial power source drive is performed by the overcurrent detector. It was a system that shuts off the power to the electric motor and stops the passenger conveyor.
For this reason, when the overcurrent detector operates, the passenger conveyor remains stopped until a special maintenance person rushes to recover and inconveniences the user.

An object of the present invention is to prevent overloading of the electric motor during such an overload condition and to prevent the passenger conveyor from being stopped for a long time due to the operation of the overcurrent detector.

[0005]

In order to achieve the above object, in the present invention, a current or power monitoring circuit for constantly monitoring the current or power of the electric motor is provided separately from the overcurrent detector, and the predetermined current or power is supplied. When it reaches the limit, warnings and cautions are broadcast to restrain users and prevent overload. Further, in the case of adopting the inverter power source drive, in addition to the above-mentioned means, the frequency applied to the electric motor is lowered to reduce the speed and reduce the output of the electric motor to prevent overcurrent.

[0006]

The current or power monitoring circuit monitors and controls the current or power flowing through the electric motor to prevent a stop failure due to an overcurrent.

[0007]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows the entire escalator, which is one of the passenger conveyors, and carries passengers while swinging endlessly on the lower and upper floors 1 and 2. The steps 3, the handrail 5, which stands upright on both sides of the step 3, the handrail 5, which rotates in the same direction as the step 3, the driving machine 6 including the motor for rotating the steps 3 and 5 It is composed of a terminal gear 7 for rotating the steps 3 by power, a control device 8 for controlling the driving machine 6 and the like, and a main body frame 9 for accommodating and supporting these devices.

2 and 3 are circuit diagrams of a control device 8 for such an escalator. FIG. 2 shows an example of control using an inverter, and FIG.
An example in which the escalator is driven by giving it to the driving machine 6 via 1 (for forward rotation) or 12 (for reverse rotation) is shown.

In detail with reference to FIG. 2, the commercial power source enters the inverter 100 via the main circuit breaker 10. In the inverter 100, it is converted into a power source having a preset voltage and frequency and sent to the driving machine 6 as a power source via the main contactor 20 to drive the escalator. here,
The main contactor 20 is controlled so that it turns on together with the escalator start signal and turns off when the escalator stops. Normally, the power from the inverter is directly sent to the drive unit 6, but in the unlikely event of a power circuit for the inverter, etc. When an abnormality occurs in the power supply, the power supply to the drive unit 6 is turned off to stop the escalator.
Such a power supply circuit is provided with a monitoring circuit 8B for monitoring the electric power or current flowing from the input side or the output side of the inverter to the drive machine 6 so that the load state of the drive machine 6, that is, the load state of the escalator is constantly maintained. I'm watching. When a large number of passengers get on the escalator and become overloaded, the power or current flowing to the drive machine 6 exceeds a preset value, and a signal from the monitoring circuit 8B is sent to the operation control circuit 8A and the voice or guidance display circuit 8C. . The voice or guidance display circuit 8C that has received the signal guides with voices or indicators (not shown) so as to refrain from using because it is in a state where the passenger has boarded too much and regulated. On the other hand, when the operation control circuit 8A receives the signal and determines that the overload state continues for a certain period of time or longer and the drive machine 6 and the power supply circuit are adversely affected, it issues a command to the inverter 100 to reduce the output frequency.
As a result, the inverter 100 reduces the output frequency to reduce the speed of the drive machine 6, that is, the speed of the escalator, and consequently the output of the planting machine 6. As a result, since the output of the driving machine 6 is reduced, the power and current flowing through the power supply circuit and the inverter 100 are also reduced, and the overload state is eliminated.

In FIG. 3, the monitoring circuit 8B for monitoring power or current, the operation control circuit 8A, and the voice or guidance display circuit 8C are the same as those shown in FIG.
The main contactor 1 without the inverter 100 shown in FIG.
The same drive device 6 is driven by a commercial power source via 1 and 12. The main contactors 11 and 12 are the operation control circuit 8A.
When either of them is turned on in response to the command, the driving machine 6, that is, the escalator, rotates in the normal direction, and the ball rotates in the reverse direction. In such a configuration, when a large number of passengers enter the escalator and become overloaded and the electric power or current flowing to the planting machine 6 exceeds a preset value, a signal from the monitoring circuit 8B outputs a voice or guidance to the operation control circuit 8A. It is sent to the display circuit 8C. In the voice or guidance display circuit 8C that receives the signal,
Since the passengers are overboarded, the passengers are restricted by voice or an indicator light (not shown) to refrain from using. As a result, passengers are suppressed and the overloaded state of the driving machine 6 is eliminated. On the other hand, when the operation control circuit 8A that receives the signal judges that the overload condition continues for a certain period of time or longer and the driving machine 6 and the power supply circuit are adversely affected, the operation control circuit 8A gives a voice or a signal to stop the overload condition once. It is sent to the display circuit 8C. In response to this, the voice or guidance display circuit 8C gives guidance to the passenger to stop it and informs the passenger. As a result, the passenger can know in advance that the vehicle will be stopped, so that a fall accident due to the stop can be prevented. afterwards,
The operation control circuit 8A turns off the main contactor 11 or 12 to stop the escalator. If the escalator stops, no electric power or current flows through the drive unit 6, so the overload state is resolved and the operation control circuit 8A is in a restartable standby state. Therefore, the administrator may regulate the passengers and then restart. Moreover, the administrator can immediately understand the cause of the stop because the stop guide is given, and the time until the restart is shortened.

Although the escalator has been described above as an example, the present invention can be applied to a sidewalk type passenger conveyor without a step.

[0013]

According to the present invention, by providing the power or current monitoring circuit for constantly monitoring the power or current of the electric motor, when the predetermined current or power is reached, an alarm or caution broadcast is issued to suppress the user. Prevent overload. Further, in the case of adopting the inverter power supply drive, in addition to the above-mentioned means, it is possible to prevent the overcurrent by preventing the overcurrent by lowering the frequency given to the electric motor to reduce the speed and reduce the output of the electric motor. It is possible to prevent the conveyor from stopping for a long time.

[Brief description of drawings]

FIG. 1 is a schematic overall side view of an escalator according to the present invention.

FIG. 2 is an operation control circuit diagram of an embodiment of the present invention.

FIG. 3 is an operation control circuit diagram of another embodiment of the present invention.

[Explanation of symbols]

6 ... Drive machine, 8 ... Control device, 8A ... Operation control circuit, 8B
... power or current monitoring circuit, 8C ... voice or guidance display circuit, 11, 12 ... main contactor, 100 ... inverter.

Claims (5)

[Claims] 1. A step which is arranged endlessly and rotates, a balustrade standing upright on both sides of the step, a handrail which turns the balustrade part in the same direction as the step at the same speed, the step and the handrail. In the passenger conveyor consisting of a control machine and a drive machine for rotating the
A monitor circuit for monitoring power or current flowing in the drive machine and a guide display circuit for voice or guidance display are provided, and when the power or current flow in the drive machine exceeds a set value of the monitor circuit, the guide display circuit outputs A passenger conveyor control device, which guides a voice or display to the effect. 2. The passenger conveyor control device according to claim 1, wherein the passenger conveyor is stopped when the power or current flowing through the driving machine exceeds a set value of the monitoring circuit. 3. The passenger conveyor control device according to claim 1, wherein an inverter is provided in the power supply circuit for the driving machine. 4. The power supply circuit for the driving machine according to claim 1, wherein an inverter is provided, and when the electric power or current flowing through the driving machine exceeds a set value of the monitoring circuit, a voice or a voice to that effect is output from the guide display circuit. A passenger conveyor control device that reduces the output frequency of the inverter and reduces the speed of the passenger conveyor while providing guidance such as display. 5. The passenger according to claim 4, wherein when the power or current flowing through the driving machine exceeds a set value of the monitoring circuit, the output frequency of the inverter is lowered according to the magnitude of the power or current. Passenger conveyor control device that reduces conveyor speed.