JP4901446B2 - Elevator control system - Google Patents

Description

  The present invention relates to an elevator control system that detects the speed of an elevator.

  Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2006-44894 (Patent Document 1), speed control is performed independently of an encoder that is attached to an elevator hoist and outputs a signal for speed or position control in an elevator control device. A speed monitoring control device that monitors the speed of the car is provided by the output signal of the encoder attached to the machine (governor), and the overspeed detection level of the governor is changed according to the position of the car. A technique for forcibly decelerating and stopping a car when the speed reaches an overspeed level is known.

JP 2006-44894 A

  In order to detect the failure of the speed monitoring control device, when transmitting the speed information detected by the pulse signal output from the encoder attached to the governor to the elevator control device, a large number of signal lines are required like a parallel communication circuit. Or a program for communication processing such as serial communication is required, and the circuit configuration of the control system becomes complicated.

  The present invention has been made in view of the above problems, and provides an elevator control system that can detect a failure of a speed monitoring control device with a relatively simple configuration.

To achieve the above object, the present invention provides first and second speed detectors that detect an elevator speed, and a speed monitoring and control device that calculates the speed of the elevator based on an output signal of the first speed detector. And an elevator control system that calculates an elevator speed based on an output signal of the second speed detector, wherein the calculated speed of the elevator is equal to or lower than a rated speed. The first speed detection state signal is output when the first speed is reached, and the second speed detection state signal is output when the second speed lower than the rated speed and larger than the first speed is reached ( The elevator control device has a timing difference between when the calculated elevator speed reaches the first speed and when the first speed detection state signal is output. Is to detect an abnormality in the speed monitoring control device based on the timing difference between when the calculated elevator speed reaches the second speed and when the second speed detection state signal is output. is there.

  According to the above means, the abnormality of the speed monitoring control device is detected based on the speed information signal output from the speed monitoring control device when the first speed and the second speed are reached. That is, since an abnormality can be detected with fewer signals, a failure of the speed monitoring control device can be detected with a relatively simple configuration.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an elevator control system according to an embodiment of the present invention.

  A speed monitoring and control device that monitors the speed of an elevator includes a rotary encoder 1 (hereinafter referred to as RE1) that is a speed detector and a microcomputer 2 (hereinafter referred to as microcomputer 2) that processes an output signal of RE1. . Here, RE1 is attached to a governor (not shown) and outputs a pulse signal in accordance with the rotation of the governor pulley. The speed monitoring control device calculates the traveling speed of the car by calculating the pulse signal of RE1 with the microcomputer 2, and outputs a speed information signal when the traveling speed reaches a predetermined speed. In the present embodiment, the speed information signal includes a 10% speed detection state signal 5 that is output when the traveling speed is 10% or more of the rated speed of the elevator, and a 90% speed detection state that is output when the travel speed is 90% or more. Signal 6.

  The speed detection state signals 5 and 6 are input to a microcomputer 4 (hereinafter referred to as a microcomputer 4) for an elevator control device. Here, the microcomputer 4 performs arithmetic processing on a pulse signal output by a rotary encoder 3 (hereinafter referred to as RE3) attached to the motor shaft of the elevator hoist according to the rotation of the motor, that is, the rotation of the sheave attached to the motor. And find the speed of the car. The speed is compared with the speed detection state signals 5 and 6 by the microcomputer 4, and the elevator control device detects an abnormality in the RE 1 or the microcomputer 2.

  The elevator control device controls the speed or position of the car by driving and controlling the hoisting machine based on the car speed calculated by the microcomputer 4. The car and the counterweight are connected to the rope, and the rope is wound around the sheave of the hoist. When the sheave is rotated by the motor of the hoist, the rope is driven, and the car and the counterweight move up and down in the hoistway.

  FIG. 2 shows the state of each signal during normal operation. When the calculation of the car speed by RE1 and microcomputer 2 is operating normally, when the car speed detected by RE3 and microcomputer 4 reaches 10% and 90% of the rated speed, speed detection status signal 5, 6 turns on.

  FIG. 3 shows the state of each signal during abnormal operation (speed gain high). When the speed gain increases due to abnormal speed detection by RE1 and microcomputer 2, the 90% speed detection status signal 6 is displayed before the car speed signal detected by RE3 and microcomputer 4 reaches 90% of the rated speed. Turn on. Thereby, the microcomputer 4 detects an abnormality of the speed monitoring control device including a failure of the RE 1 or the microcomputer 2.

  FIG. 4 shows the state of each signal during abnormal operation (speed gain low). When the speed gain becomes low due to speed detection abnormality by RE1 and microcomputer 2, 10% speed detection state signal 5 turns on after the speed signal detected by RE3 and microcomputer 4 reaches 10% of the rated speed. . Thereby, the microcomputer 4 detects an abnormality of the speed monitoring control device.

  Further, although it is possible to detect an abnormality only with the 90% speed detection state signal 6, there is a case where an operation that does not reach the rated speed is performed depending on the specification of the elevator. In this case, since the traveling speed of the car does not reach 90% of the rated speed even during normal operation, an abnormality cannot be detected only by the 90% speed detection state signal 6. Therefore, the 10% speed detection state signal 5 is necessary to enable detection even when the speed is low.

  FIG. 5 shows the state of each signal in the low speed operation state where the rated speed is not reached. When the speed gain changes due to abnormal speed detection by RE1 and microcomputer 2 in the state where speed detection of both RE1 and RE3 has not reached the rated speed due to short floor operation or low speed operation, RE1 and microcomputer The timing at which the 10% speed detection state signal 5 in 2 is turned on does not coincide with the time when the speed signal detected by the RE 3 and the microcomputer 4 reaches 10% of the rated speed. Thus, even in a low-speed operation state that does not reach the rated speed of the elevator, it is possible to detect an abnormality in speed detection of RE1 and the microcomputer 2.

  As described above, when the speed monitoring control device including RE1 and microcomputer 2 is abnormal, speed detection state signals 5 and 6 by RE1 and microcomputer 2, and the speed of the car detected by RE3 and microcomputer 4 of the elevator control device. By detecting the signal timing deviations 7 and 8, it is possible to detect an abnormality of the speed monitoring control device such as a failure of the RE 1 and the microcomputer 2. When an abnormality is detected, the elevator control device creates a car stop command or transmits an abnormality detection signal to the elevator manager terminal or the management center.

  According to the above-described embodiment, it is possible to detect an abnormality in the speed monitoring control device using two speed state signals (for example, a 2-bit signal) of the speed detection state signals 5 and 6. Further, a program for communication processing between the speed monitoring control device and the elevator control device becomes unnecessary or can be reduced. Therefore, the configuration of the elevator control system becomes relatively simple. For this reason, the number of parts of the elevator control system is reduced, the cost is reduced, and the reliability of the failure detection circuit itself is improved.

1 shows an elevator control system according to an embodiment of the present invention. Indicates the state of each signal during normal operation. Indicates the state of each signal during abnormal operation (speed gain high). Indicates the state of each signal during abnormal operation (speed gain low). The state of each signal in the low speed operation state which does not reach the rated speed is shown.

Explanation of symbols

1, 3 Rotary encoder 2, 4 Microcomputer 5 10% speed detection status signal 6 90% speed detection status signal

Claims (3)

First and second speed detectors for detecting an elevator speed, a speed monitoring control device for calculating the speed of the elevator based on an output signal of the first speed detector, and an output of the second speed detector An elevator control system comprising an elevator control device that calculates an elevator speed based on a signal,
The speed monitoring control device outputs a first speed detection state signal when the calculated elevator speed reaches a first speed equal to or lower than a rated speed, and outputs a first speed detection state signal equal to or lower than the rated speed and greater than the first speed. When a speed of 2 is reached, a second speed detection state signal is output,
The elevator control device is configured such that a difference in timing between when the calculated elevator speed reaches the first speed and when the first speed detection state signal is output, or when the calculated elevator speed is the second speed. An elevator control system that detects an abnormality of the speed monitoring control device based on a timing difference between when the speed reaches a predetermined speed and when the second speed detection state signal is output . The elevator control system according to claim 1, wherein the first speed is approximately 10% of the rated speed, and the second speed is approximately 90% of the rated speed.   The elevator control system according to claim 1, wherein the first speed or the second speed is equal to or lower than a low speed operation speed of the elevator.

Images