JPH05254754A - Control device for elevator - Google Patents

Abstract

PURPOSE:To prevent an elevator, placed in a free condition, from dropping down in a load direction by stopping control action of a speed control means in the case of realizing both conditions that a door of the elevator is placed in an opened condition and a brake means is actuated. CONSTITUTION:When an operation command is output from an operation control circuit 1, an ignition command is output to a gate control circuit 3 from a speed control circuit 2, and a car 6 is operated to a predetermined position by a three-phase induction motor 5. In an elevator control device thus provided, when a door opening condition is detected during elevator operation, a speed reference from the operation control circuit l is turned off to also output a brake drive signal 10 from a brake control circuit 9, and a brake device 7 is actuated with an action delay for a fixed time. When a brake action detection signal 14 and a door opening detection signal 12 are obtained, a gate stop command signal 15 is fed to the gate control circuit 3 from an AND circuit 13, to stop speed control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to elevator operation /
The present invention relates to an elevator control device that controls stop, and more particularly, to an elevator control device that can safely stop an elevator in any operating state to improve control reliability.

[0002]

2. Description of the Related Art In recent years, due to the development of power semiconductors and the improvement of control technology, power semiconductors, in particular, inverters using transistors have been remarkably spread, and have been used for almost all applications of motor control. Even in elevators, it has already been used in many models, which has improved riding comfort and energy savings, making a marked improvement over conventional models. This inverter is a power semiconductor,
In particular, by using a high-power transistor, the current flowing in the winding of the electric motor (mainly a three-phase induction motor) corresponding to the rotation of the electric motor is controlled, and the torque generated by the electric motor is controlled.
By operating an elevator connected to an electric motor and controlling the speed, a predetermined speed and acceleration / deceleration are obtained to ensure the ride comfort of the elevator and the accuracy of the landing level.

Here, the control particles of the high power transistor for controlling the current flowing through each phase of the motor are called a base. By controlling this base, the voltage of the motor is controlled, Control the torque. The base control circuit is called a gate circuit and is one of the most important circuits of the inverter control circuit. In addition to the gate circuit, there are various circuits such as speed control and current control. If this gate circuit becomes abnormal, the electric motor will operate abnormally and the elevator will be greatly affected. .. In other words, even if an abnormality occurs in another circuit, if the base control is stopped in the gate circuit, the electric motor will stop and the elevator will stop immediately, so passengers and equipment can be protected. .. Hereinafter, a conventional elevator control device employing this type of inverter will be described.

FIG. 3 is a block diagram showing a configuration example of an elevator control device. In FIG. 3, 1 is an operation control circuit, 2 is a speed control circuit, 3 is a gate control circuit, 4 is a power transistor main circuit, 5 is a three-phase induction motor, 6 is an elevator car, 7 is a brake device, and 8 is for driving. Hoisting machine, 9
Is a brake control circuit, 10 is a brake drive signal, 11 is a protection safety circuit, and 12 is a door open detection signal.

That is, a signal required for operating the elevator is input to the operation control circuit 1 and the elevator is driven to a predetermined position depending on the position of the elevator and the position of the call. A brake release command is sent to the brake control circuit 9 while being given to the speed control circuit 2.

Further, the output of the speed control circuit 2 is given to the gate control circuit 3, and the necessary ignition command for each phase is given to the high-power transistor main circuit 4, whereby the voltage given to the three-phase induction motor 5 is given. And the elevator car 6 is operated via the drive hoist 8.

On the other hand, the brake device 7 directly connected to the three-phase induction motor 5 and the drive hoist 8 has a brake control circuit 9
It is controlled by the output signal 10 from. Further, a safety protection circuit 11 is provided, which receives signals from the operation control circuit 1 and the speed control circuit 2 to check whether the system is operating normally and to protect if there is an abnormality. The detection signal from is input to the gate control circuit 3,
When abnormality is detected, the gate control is stopped and the three-phase induction motor 5
To stop the elevator. Further, the operation control circuit 1 issues a command to the brake control circuit 9, a brake drive signal 10 is sent to the brake device 7, and the elevator is stopped.

On the other hand, in the elevator, a door closing signal is one of the most important signals. This is a signal that detects that the elevator car 6 and the door of the hall are closed, and is a signal that is the basis of the elevator operation. As long as the door is closed and the vehicle is operated, a major accident does not occur. in this way,
Since the door close signal is an important signal, the operation will be stopped immediately when the door is opened, but the operation control circuit 1
The speed reference signal from is turned off to stop the operation, the door open signal is sent to the gate control circuit 3 to stop the gate control, and the control function is stopped to stop the operation.

By the way, in order to ensure safety of passengers and equipment in such an elevator control device,
The circuit configuration as described above is effective, and there is no particular problem in a normal operating state under normal conditions.

However, when it is detected that the door close confirmation switch is turned off and the door is opened during high speed operation due to an abnormality in the door close confirmation switch, an abnormality in the door control circuit, etc., an operation command is issued. When the brake is turned off and a signal for stopping the control is given to the gate control circuit 3 as well as the brake is turned off, the function of stopping the elevator is delayed due to the operation delay of the brake circuit and the brake mechanism. On the other hand, the control stop signal given to the gate control circuit 3 cuts off the speed control at the position closest to the main circuit of the electric motor control circuit, so that the operation is quick.

Therefore, the speed control is interrupted earlier than the operation of the brake device 7, during which the elevator is in a free state and falls in the load direction. In particular, in the case of a winding cylinder type drive device or a machine with high mechanical efficiency, this drop is particularly likely to occur. In addition, such a state also occurs in a completion inspection of the elevator control device, for example, when the door is opened while the elevator is running and a test is performed to confirm that the elevator will stop. Instead, it may fail during the inspection.

[0012]

As described above, in the conventional elevator control device, since the opening of the door is detected, the speed control is stopped and the elevator is stopped. There was a problem that the elevator was in a free state and dropped in the load direction until the device was operated, and the elevator could not be stopped safely.

An object of the present invention is to provide an elevator control device capable of safely stopping the elevator under any operating condition and improving the control reliability.

[0014]

In order to achieve the above object,

First, in the invention described in claim 1, the operation / control for inputting various signals necessary for the operation of the elevator and controlling the operation of the elevator according to the state of the signal.
An operation control unit that outputs a stop command and a brake command, and a speed control unit that operates / stops the elevator by controlling a drive hoist for driving the elevator based on the operation / stop command from the operation control unit. A brake means for stopping the operation of the drive hoist, and a brake control means for driving the brake means to stop the elevator based on a brake command from the operation control means,
Door open / close detection means for detecting the open / closed state of the elevator door, brake operation detection means for detecting the operation of the brake means, and door open / close detection means for detecting that the elevator door is open, and braking Under the condition that the operation of the braking means is detected by the operation detecting means,
And a control operation stopping means for outputting a command for stopping the control operation to the speed control means.

According to the second aspect of the present invention, various signals necessary for operating the elevator are input, and the operation / control for controlling the operation of the elevator is performed according to the state of the signals.
An operation control unit that outputs a stop command and a brake command, and a speed control unit that operates / stops the elevator by controlling a drive hoist for driving the elevator based on the operation / stop command from the operation control unit. A brake means for stopping the operation of the drive hoist, and a brake control means for driving the brake means to stop the elevator based on a brake command from the operation control means,
Door opening / closing detection means for detecting the open / closed state of the elevator door, brake operation detection means for detecting the operation of the brake means, and a brake command from the operation control means are input, and the operation is performed with a delay of a predetermined time from the input. The brake operation delay detection means and the brake operation detection means detect that the brake means has operated, or the operation signal from the brake operation delay detection means is detected, and the door opening / closing detection means opens the elevator door. And a control operation stopping means for outputting a command for stopping the control operation to the speed control means under the condition that the above condition is detected.

[0017]

Therefore, in the elevator control device according to the first aspect of the present invention, the speed control means operates when both the condition that the elevator door is open and the condition that the brake means is operated are satisfied. By stopping the control operation, the elevator does not fall into the free state in the load direction, and the elevator can be safely stopped.

Further, in the elevator control device according to the second aspect of the present invention, it is possible that the braking means is operated, or the operation delay of the braking device is detected, and the elevator door is open. When both conditions are satisfied, by stopping the control operation of the speed control means, the elevator does not fall into the free state in the load direction, and the elevator can be stopped safely.

Further, it is possible to prevent the speed control from being stopped due to an abnormality in the brake circuit and the brake operation confirmation signal, etc., even though the brake command is output.

As a result, the brake device including the brake confirmation signal circuit can be backed up for abnormalities so that the brake device can be operated reliably and the speed control is completely stopped, so that the elevator can be safely operated even in the unlikely event of an abnormality. It will be possible to stop at.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an example of the configuration of an elevator control apparatus according to the present invention. The same parts as those in FIG. 3 are designated by the same reference numerals and the description thereof will be omitted. Only different parts will be described here. ..

That is, the elevator control apparatus of this embodiment is configured by providing the brake device 7 in FIG. 3 with a brake operation detector and adding an AND circuit 13 as a control operation stopping means. Here, the brake operation detector detects the operation of the brake device 7 and outputs the brake operation detection signal 14.

The AND circuit 13 inputs the door open detection signal 12 from the operation control circuit 1 and the brake operation detection signal 14 from the brake operation detector, and the AND conditions of both detection signals 12 and 14 are determined. When satisfied, it outputs a gate stop command signal 15 for stopping the control operation to the gate control circuit 3 forming a part of the speed control means. Next, the operation of the elevator control device of the present embodiment configured as described above will be described.

In FIG. 1, according to the states of various signals, a driving command is output from the driving control circuit 1 and is input to the speed control circuit 2, and a firing command is output to the gate control circuit 3 for three-phase induction. The electric motor 5 is driven to drive the elevator to a predetermined position.

A brake release signal is output from the operation control circuit 1, and the brake control circuit 9 controls the brake as a voltage for driving the actual brake device 7.

That is, at the start of operation, control is started at the same time as the door is closed to perform pre-excitation, and operation is started at the same time as opening the brake. When the elevator normally stops, the operation control circuit 1 outputs a stop command to the speed control circuit 2, and the elevator control command is given to the gate control circuit 3 to perform stop control.
After that, a brake command is output, the elevator and the three-phase induction motor 5 are completely stopped, and then the brake is applied. After confirming that the brake is completely applied by the brake operation detection signal 14, the AND circuit 13 stops the gate. The command signal 15 is output to completely stop the speed control. Next, a case where the door open state is detected for some reason while the elevator is traveling will be described.

Now, when the elevator is operating,
When the door is opened, the operation command and the brake release command are activated, and the device operates to reduce the elevator speed.However, in addition to such stop operation, it is necessary to stop the speed control for safety. Therefore, by sending a command to the gate control circuit 3 to stop the gate control, it is effective to prevent damage to passengers and equipment by operating in an open door state, but the elevator travels. Since the control is stopped during the operation, depending on the load and the driving direction, in the case of power running, the vehicle temporarily stops and then accelerates in the opposite direction. Also,
In the case of regeneration, further acceleration begins. On the other hand, although the brake command is output at the same time, as described above, the brake device 7 has the mechanical portion and its operation is delayed, so that the above state is maintained for a short time.

In this respect, in the elevator control apparatus of this embodiment, such a problem can be prevented by inputting the door open detection signal 12 and the brake operation detection signal 14 to the AND circuit 13.

That is, when the door open state is detected during traveling of the elevator, the speed reference from the operation control circuit 1 is turned off, and the elevator is to be stopped. On the other hand, in order to stop the elevator by the brake device 7, a brake drive signal 10 is output from the brake control circuit 9 and is sent to the brake device 7, and after a delay in operation after a certain time, the brake mechanism operates to operate the elevator. Is stopped. At this time, the brake operation detection signal 14 is output,
It is sent to the AND circuit 13. As a result, the AND circuit 1
3, the door open detection signal 12 and the brake operation detection signal 14
When both are turned on, by sending the gate stop command signal 15 to the gate control circuit 3, it is possible to prevent the above-mentioned inconvenience due to the speed control being stopped before the operation of the brake device 7, and to make the elevator safe. It can be stopped. As described above, the safety is maintained by stopping the speed control in response to the detection of the opening of the door, but the safety when the elevator is stopped is also secured by linking with the brake device 7.

As described above, the elevator control apparatus according to the present embodiment inputs various signals necessary for elevator operation, and operates / stops commands for controlling elevator operation according to the states of the signals. Operation control circuit 1 that outputs a brake command, and operation / operation from operation control circuit 1
From the speed control circuit 2, the gate control circuit 3, the power transistor main circuit 4, the three-phase induction motor 5 which controls the drive hoist 8 for driving the elevator based on the stop command to operate / stop the elevator. Based on the speed control means, the brake device 7 for stopping the operation of the drive hoist 8, and the brake command from the operation control circuit 1,
A brake control circuit 9 for driving the brake device 7 to stop the elevator, a door opening / closing detection means for detecting an open / closed state of the elevator door, a brake operation detector for detecting the operation of the brake device 7, and a door opening / closing. When the AND condition of the door opening detection signal 12 from the detection means and the brake operation detection signal 14 from the brake operation detector is satisfied, the gate control circuit 3 of the speed control means stops the control operation. The AND circuit 13 outputs a command signal 15.

Therefore, the control operation of the gate control circuit 3 of the speed control means is stopped when both the condition that the elevator door is open and the condition that the brake device 7 is operated are satisfied. As described above, the elevator does not fall into the load direction in the free state, and the elevator can be stopped safely. As a result, a safe and extremely reliable elevator control device can be realized. Next, another embodiment of the present invention will be described.

FIG. 2 is a block diagram showing a configuration example of an elevator control apparatus according to the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Only different parts will be described here. ..

That is, the elevator control apparatus according to the present embodiment includes the brake operation delay detection circuit 16 and the OR circuit 1.
7 is added to FIG. 1 and the brake operation detection signal 1
4 is input to the safety protection circuit 11 and the safety protection circuit 11
The brake power supply control signal 18 is input to the brake control circuit 9.

Here, the brake operation delay detection circuit 16
Is to input a brake command from the operation control circuit 1, operate for a predetermined time (corresponding to the operation delay time of the brake device 7) from the input, and output a signal.

Further, the OR circuit 17 inputs the brake operation detection signal 14 from the brake operation detector and the operation signal from the brake operation delay detection circuit 16, and when the OR conditions of both signals are satisfied, the signal is output. The signal is input to the AND circuit 13 instead of the brake operation detection signal 14.

In the elevator control device having such a configuration, the brake operation detection signal 14 is applied to the safety protection circuit 11.
The brake power supply control signal 18 in the safety protection circuit 11 shuts off the power supply of the brake control circuit 9, and the brake release command signal is input to the brake operation delay detection circuit 16 to respond to the brake operation command. The delay signal considering the operation delay time of 7 and the brake operation detection signal 13 are input to the OR circuit 17, and the output signal thereof is input to the AND circuit 13 together with the door open detection signal from the operation control circuit 1.

As a result, even though the brake drive signal 10 is output to the brake device 7, it is impossible to stop the speed control due to an abnormality in the brake circuit and the brake operation detection signal 14, or the like. It is possible to prevent it, and also for the brake device 7,
In the event of an abnormality, the backup including the brake operation detector is performed, the brake device 7 can be operated reliably, the speed control can be completely stopped, and the elevator can be safely stopped in the event of an abnormality.

[0039]

As described above, according to the present invention, various signals necessary for operating an elevator are input, and an operation / stop command and a brake command for controlling the operation of the elevator according to the state of the signals. On the basis of the operation control means for outputting and the operation / stop command from the operation control means,
A speed control means for controlling the drive hoist for driving the elevator to start / stop the elevator, a brake means for stopping the operation of the drive hoist, and a brake command from the operation control means Brake control means for driving the brake means to stop the elevator, door opening / closing detection means for detecting the open / closed state of the elevator door, and brake operation detection means for detecting the operation of the brake means. Brake operation delay detecting means for inputting a brake command from the means, and a delay operation from the input by a predetermined time; and) A door opening / closing detecting means detects that the elevator door is in an open state, and a brake operation detecting means. Outputs a command to stop the control operation to the speed control means under the condition that the brake operation is detected by The control operation stop means (or the brake operation detection means detects that the brake means has operated, or the operation signal from the brake operation delay detection means is detected, and the door opening / closing detection means opens the elevator door. Under the conditions detected to be
And a control operation stopping means for outputting a command for stopping the control operation to the speed control means).
It is possible to provide an elevator control device capable of safely stopping the elevator in any operating state and improving control reliability.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing another embodiment of an elevator control device according to the present invention.

FIG. 3 is a block diagram showing a configuration example of a conventional elevator control device.

[Explanation of symbols]

1 ... Operation control circuit, 2 ... Speed control circuit, 3 ... Gate control circuit, 4 ... Power transistor main circuit, 5 ... Three-phase induction motor, 6 ... Elevator car, 7 ... Brake device, 8 ... Driving hoist, 9 ... Brake control circuit, 10 ... Brake drive signal, 11 ... Protective safety circuit, 12 ... Door open detection signal, 13
... AND circuit, 14 ... Brake operation detection signal, 15 ... Gate stop command signal, 16 ... Brake operation delay detection circuit,
17 ... OR circuit, 18 ... Brake power supply control signal.

Claims (2)

[Claims] 1. Operation control means for inputting various signals required for elevator operation, and for outputting an operation / stop command and a brake command for controlling the operation of the elevator according to the state of the signals, and the operation: Speed control means for controlling a drive hoist for driving the elevator based on a start / stop command from the control means to start / stop the elevator, and stopping the operation of the drive hoist. And a brake control means for driving the brake means to stop the elevator based on a brake command from the operation control means, and a door opening / closing detection for detecting an open / closed state of the elevator door. Means, a brake operation detection means for detecting the operation of the brake means, and the door opening / closing detection means for opening the elevator door. Is detected, and the brake operation detecting means detects that the brake means has operated,
An elevator control apparatus comprising: a control operation stopping unit that outputs a command for stopping the control operation to the speed control unit. 2. An operation control means for inputting various signals required for elevator operation and outputting an operation / stop command and a brake command for controlling the operation of the elevator according to the state of the signal, and the operation Speed control means for controlling a drive hoist for driving the elevator based on a start / stop command from the control means to start / stop the elevator, and stopping the operation of the drive hoist. And a brake control means for driving the brake means to stop the elevator based on a brake command from the operation control means, and a door opening / closing detection for detecting an open / closed state of the elevator door. Means, a brake operation detection means for detecting the operation of the brake means, and a brake command from the operation control means, Brake operation delay detection means that operates after a predetermined time from the input, whether the brake operation has been detected by the brake operation detection means, or an operation signal from the brake operation delay detection means is detected, and And a control operation stopping means for outputting a command for stopping the control operation to the speed control means under the condition that the door opening / closing detection means detects that the elevator door is open. Characteristic elevator control device.