JP2000038265A - Elevator controller in power failure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator controller at the time of power failure which does not necessitate mounting of a 50% load detection device on a car and prevents free run of an elevator at the time of judgement in the direction of light load. SOLUTION: An elevator controller EC at the time of power failure which rescues and operates an elevator up to a closest floor using a power device for emergency BAT at the time of power failure is provided with a means BD opening an electromagnetic brake MB temporarily at the time of power failure a means RE judging a direction when a traction machine TM rotates in the direction of heavy load in accordance with opening of this electromagnetic brake MB, a means HD which drives a traction motor IM and gives a rotation force in the opposite direction to stop the rotation of the traction machine TM when the traction machine TM rotates, a means MD operating the electromagnetic brake when the rotation stops, and a means which drives the traction motor IM based on the results of judgement of the direction judging means RE and rescues and operates the elevator to a closest floor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator operation control device at the time of a power failure for rescue operation of an elevator using an emergency power supply device.

[0002]

2. Description of the Related Art Generally, in an elevator, when rescuing a passenger during a power outage, the load on a car is measured, and the elevator is operated in a light load direction. As a means for detecting the light load direction, a light load direction is detected by attaching a 50% load detection device to a car.

Further, as disclosed in Japanese Kokai Publication No. 95-11982, the electromagnetic brake of the traction machine is once released, and the rotation detector detects that the larger one of the car and the counterweight descends. In order to detect the light load direction and determine the light load direction, there has been proposed.

[0004]

In the prior art, there is a problem that it takes a lot of time and money to mount the 50% load detecting device on the delivered elevator.

In the method disclosed in Japanese Patent Publication No. 95-11982, the electromagnetic brake is once released, and the car or the counter weight is lowered, whichever is larger, until the electromagnetic brake is applied again. Is controlled by time, and there is a problem that the elevator coasts during that time.

SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator control device at the time of a power outage that eliminates the need for mounting a 50% load detecting device on a car and prevents free-running of the elevator when determining the light load direction.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an elevator control apparatus for rescue operation of an elevator to the nearest floor using an emergency power supply unit in the event of a power failure. Means for determining the direction when the traction machine rotates in the heavy load direction with the release of the electromagnetic brake, and driving the traction motor when the traction machine rotates, giving a rotational force in the opposite direction to rotate the traction machine. Means for stopping, means for operating the electromagnetic brake at the time of rotation stop,
This is achieved by providing a means for driving a traction motor based on the result of the discrimination by the direction discriminating means and rescue the elevator to the nearest floor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG.

A rotation detector RE attached to a rotation shaft of the traction motor IM directly connected to the traction machine TM detects a rotation direction and a rotation speed of the traction motor IM. A car C is hung on one side of the traction machine TM via a rope, and a counterweight W is hung on the other side. When the elevator stops, the traction machine TM is held by an electromagnetic brake MB so as not to rotate.

When the service power supply RST fails, the power failure detection relay PD detects the power failure and turns off.
Is switched to the emergency power supply BAT by the contact of
It is controlled by the power failure control circuit EC.

In the power failure control circuit EC, an electromagnetic brake drive command is first issued from the light load direction detection circuit LD, and in response to this command, the brake drive circuit BD operates to release the electromagnetic brake MB. With the release of the electromagnetic brake MB, the larger of the car C and the counterweight W, which are the loads on the traction machine TM, descends. Accordingly, the rotation axes of the traction machine TM and the traction motor IM rotate, and the rotation direction is detected by the rotation detector RE. Here, a traction motor drive command in a direction opposite to the direction detected by the rotation detector is generated by the power failure control circuit EC. In response to this command, the traction motor heavy load direction drive circuit HD
Operates and the rotation detector RE is connected to the traction motor.
Apply a torque in the direction opposite to the direction of rotation detected in step 1 to stop the rotation of the rotation shaft of the traction machine. Then, the electromagnetic brake drive command is interrupted, and the electromagnetic brake MB is held. Thereafter, the rescue operation is performed in the light load direction determined by the light load direction detection circuit LD according to the rescue operation command.

[0012]

According to the present invention, it is possible to determine the light load direction of the elevator operation control at the time of a power failure without adding a weighing device for detecting a 50% load to the elevator car. It is possible to reduce the design change of the car frame, the number of parts, and the assembling work when the rescue operation device is mounted.

Further, when the electromagnetic brake is released and the light load direction is determined, the free running of the elevator can be prevented until the electromagnetic brake is released and the electromagnetic brake is applied again.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of an elevator control device at the time of a power failure according to the present invention.

FIG. 2 is an elevator operation control flowchart at the time of a power failure.

[Explanation of symbols]

 TM Traction machine IM Traction motor RE Rotation detector RST Regular power supply BAT Emergency power supply PD Regular power failure detection relay PDc1, PDc2 Regular power failure detection relay contact EC Power failure control circuit BD Electromagnetic brake drive circuit MD Traction motor drive circuit HD Traction motor Heavy load direction drive circuit C Riding car W Counterweight

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kazuhiko Ito 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo F-term in Hitachi Building Systems Co., Ltd. 3F304 BA27 CA05 CA12 EA11 EB11 EC04

Claims (1)

[Claims] In an elevator control device for power failure in which an elevator is rescued to the nearest floor using an emergency power supply device during power failure, means for temporarily releasing an electromagnetic brake during power failure, Means for determining the direction of rotation of the traction machine in the heavy load direction, means for driving the traction motor when the traction machine is rotating, and applying a rotational force in the opposite direction to stop the rotation of the traction machine; An elevator control device at the time of a power failure, comprising: means for operating an electromagnetic brake; and means for driving a traction motor based on a result of the discrimination by the direction discriminating means to rescue the elevator to the nearest floor. .