JPH01313285A - Malfunction detector for elevator - Google Patents

Abstract

PURPOSE:To keep off any increase in a starting impact even at a time when a load detecting signal comes abnormal by compensating this load detecting signal according to a difference between output of a load variation detecting means and that of a load variation predictive operational means. CONSTITUTION:A load variation detecting means 21 inputs a load detecting signal 8a and detects the maximum value of a variation portion of this load detecting signal 8a during travel of a cage. A load variation predictive operational means 22 predictively operates the maximum value of the variation portion of the load detecting signal 8a during travel by the load detecting signal 8a during stoppage of the cage and the preset maximum acceleration. Then, a compensating means 23 compensates the load detecting signal 8a according to a difference between output of the load variation detecting means 21 and that of the load variation predictive operational means 22, while a speed control operational means 24 generates a current command signal 10a by a speed command signal 9a and a speed signal 7a. With this constitution, even at a time when the load detecting signal 8a comes abnormal, any increase in a starting impact is preventable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for detecting an abnormality in a load detector of an elevator.

[Prior Art] Fig. 5 and Fig. 6 are diagrams showing a conventional elevator load detection device disclosed in, for example, Japanese Patent Publication No. 15467/1982, in which Fig. 5 is a block diagram and Fig. 6 is a diagram showing a conventional elevator load detection device. FIG. 2 is a block diagram of a speed control calculation device.

In the figure, (1) is an electric motor for driving the elevator, (2) is a drive sheave connected directly to the electric motor (1) or via a reducer (not shown), (3) is a deflection sheave, and (4) ) is the car, (5) is the counterweight, (6) is the main rope that is wound around the driving sheave (2) and the deflection sheave (3) and connects the car (4) and the counterweight (5), (7) ) is a speed detector which is driven by the drive sheave (2) and emits a speed signal (7a) consisting of pulses with a frequency corresponding to the rotational speed of the electric motor (1);
(8) A load detector that detects the load in the heel (4) and outputs a load detection signal (8a) corresponding to the load; (9)
is a speed command generation device that emits a speed command signal (9a), (
10) is composed of a microcomputer (hereinafter referred to as microcomputer) as described later, and inputs a speed command signal (9a), a speed signal (7a), and a load detection signal (8a) and outputs a current command signal (10a). In the control calculation unit, (
11) is an adder, (12) is an operational amplifier, (13) is an adder, (14) is a slip/current converter that converts the slip frequency command into a current command, and (15) is a current command signal (10a
) is a power converter that supplies electric power to the electric motor (1).

A conventional elevator load detection device is configured as described above, the load in the car (4) is detected by the load detector (8), and the load detection signal (8a) is sent to the speed control calculation device (1).
0). In the speed control calculation device (lO), the speed command signal (9a) and the speed signal (7a) are added to the adder (11).
After amplifying the deviation signal with the operational amplifier (12), the adder (13) adds the load detection signal (8a), and the slip/current converter (14) adds the current command signal (10a).
Convert to The current command signal (10a) is transmitted from the power converter (
15), and the necessary power is supplied to the electric motor (1).

In other words, at startup, the weight of the heel (4) and the counterweight (
5) Jumping out or running backwards, so-called starting impact, caused by imbalance with the weight of item 5) is prevented by introducing a load detection signal (8a) into the control system and correcting the torque of the electric motor (1). Note that the load detection signal (8a) is originally set to zero at the point where the car (4) and the counterweight (5) are balanced.
It is further multiplied by a predetermined gain and sent to the adder (13).
This has been omitted in the above description for the sake of brevity.

[Problem to be solved by the invention] In the conventional elevator load detection device as described above,
Speed control calculation bag for load detection signal (8a)! (10), if the load detection signal (8a) becomes abnormal due to a failure of the load detector (8), an incorrect compensation will be performed, and instead of reducing the startup shock, the Depending on the situation, there is a problem in that the starting impact may increase. In contrast, the load detection signal (
Although it is possible to limit the possible values of 8a), similar problems arise within the limited range.

This invention was made in order to solve the above problems, and an object thereof is to provide an abnormality detection device for an elevator that can prevent an increase in starting shock even when a load detection signal becomes abnormal. do.

[Means for Solving the Problems] An abnormality detection device for an elevator according to the present invention detects the maximum value of the variation of the load detection signal during running, and compares it with the load detection signal during stoppage by a preset maximum adjustment. The maximum value of the variation of the load detection signal during driving is calculated based on the speed, and input to the speed control calculation device according to the difference between the maximum value of the actual load variation and the predicted maximum value of the load variation. This system corrects the load detection signal.

[Function] In the present invention, the load detection signal is corrected according to the difference between the maximum value of the actual load fluctuation detected during driving and the maximum value of the predicted load fluctuation.

When the load detection signal does not make a predetermined change during driving, it is detected as an abnormality and the load detection signal is corrected.

[Example] Figures 1 to 3 are diagrams showing an example of the present invention.
2 is a block diagram of the speed control arithmetic device, and FIG. 3 is a flowchart showing the load detection signal correction operation. Portions similar to those of the conventional device are designated by the same reference numerals. Note that FIG. 5 is also used in this embodiment.

This embodiment is constructed as shown in FIG.

In the figure, (21) is a load fluctuation detection means that inputs the load detection signal (8a) and detects the maximum value of the fluctuation of the load detection signal (8a) while the car (4) is running; (4)
The load detection signal (8a) while running is based on the load detection signal (8a) while stopped and the preset maximum acceleration/deceleration.
The load fluctuation prediction calculation means (23) predicts and calculates the maximum value of the fluctuation of the load fluctuation prediction calculation means (23), which outputs the load detection signal (8a) according to the difference between the output of the load fluctuation detection means (21) and the output of the load fluctuation prediction calculation means (22). ), and (24) is a speed control calculation means that generates a current command signal (10a) based on the speed command signal (9a) and the speed signal (7a), as described above.

In Figure 2, (10) is a speed control calculation unit composed of a microcomputer, which includes CPU (IOA), ROM (IOB
), RAM (IOC).

D/A (digital/analog) converter (100), counter (IOE), A/D (analog/digital) converter (IOF) and I/F (interface) (IOC
).

The D/A converter (100) is a power conversion bag! (15), the counter (10[E) is connected to the speed detector (7), the AID converter (IOF) is connected to the load detector (8), and the I/F (LOG)
are respectively connected to a speed command generator (9).

Now, when the car (4) is stationary, the load detection signal (8a)
teeth.

V8a=k-W [V] Here, V8a: Load detection signal [V] W: Load [kgl] in the car (4) k: Weight [kgl is a gain for converting into voltage [, V]. The unbalanced load compensation value τ at this time is 2 1d-kg.

1:10-Ping no Tokisha=1. 2: When 10-ping, 1 = 2 kg = Reduction ratio Wb: Internal load [kg] at the heel (4) at the point of balance with the counterweight (5).

While the car (4) is running, gravitational acceleration g [m/S21 is applied, so if the car is running at a constant speed, N=WX9.8 [kg/S2]. Here, α is acceleration/deceleration [m/S2].

As a result, if the load detection signal (8a) during running is Wl, then the following equation is obtained.

First, in step (31) it is determined whether or not the heel (4) is running, and if it is, steps (31) to (34)
), a load fluctuation detection operation is performed to set the maximum value Amax of the absolute value of the fluctuation amount A of the load detection signal (8a) during running. That is, in step (32) the load detection signal (8a
It is determined whether the absolute value A of the fluctuation component of ) exceeds the maximum value A.sub.ax, and if it exceeds the absolute value A of the fluctuation component, the absolute value A of the fluctuation component is set to the maximum value Amax in step (34). If it is less than the maximum value Amax, the process jumps to step (39).

If it is determined in step (31) that it is stopped, step (
The process proceeds to step 35), where a load fluctuation calculation operation is performed and a predetermined value B is calculated. The predetermined value B is based on formula 0.

is required. Here, β is a margin value to prevent false detection. In step (36), the maximum value A, aX set while the vehicle is running, and a predetermined value B are compared.

Then, the correction operation is performed in step (37) (3g).

That is, if it is determined in step (36) that Amax<B.

This means that there was no predicted variation and represents an abnormality, so in step (37) the unbalanced load signal C
Forcibly set to wb. Also, if it is determined that Amax≧B, this means that there was a predicted fluctuation, and it represents normality, so in step (38)
b is set as the unbalanced load signal C. Then, in step (39), speed control calculation is performed using the unbalanced load signal C.

In step (40), a current command signal (10a) is output.

FIG. 4 is a flowchart showing a load detection signal correction operation according to another embodiment of the present invention, in which two load detectors (8) are installed.

The outputs of the two load detectors (8) are W and Wl, respectively.

Then, the load detection signal (8a) while stationary is W = −(
W, Eng + W Yu2). Based on this value, the load detection signal (8a) during driving is
When we find , we get , as shown above.

Now, if one of the two load detectors (8) fails and maintains a constant value, the load detection signal (
8a).

2 9.8 2 . In other words, the variation due to acceleration/deceleration is 1/2 of the original value.
become.

■From formula and 0 formula.

w, 2 = 2 W-W,.

9.8, the correct value W11 can be found, so in this case, if the load detection signal (8a) is set to 2W, □, correct compensation can be performed even if one is out of order.

Therefore, in step (41), it is determined whether one of them is normal or not.
2, in step (42), 2W□
1 and set the unbalanced load signal C. When it is determined that both of them are abnormal, in step (37), the unbalanced load signal C is forcibly set to wb as in FIG. 3.

In each of the above embodiments, the case where one or two load detectors (8) are installed has been described, but it is also applicable to the case where more than one load detector (8) is installed.

[Effects of the Invention] As explained above, in this invention, the load detection signal is corrected according to the difference between the maximum value of the actual load fluctuation detected during driving and the maximum value of the predicted load fluctuation. , even when the load detection signal becomes abnormal.

This has the effect of being able to prevent an increase in starting shock and providing an elevator with a safe and comfortable ride.

[Brief explanation of the drawing]

1 to 3 are diagrams showing an embodiment of an elevator abnormality detection device according to the present invention, and FIG. 1 is an overall configuration diagram. FIG. 2 is a block diagram of the speed control calculation device, FIG. 3 is a flowchart showing load detection signal correction operation, FIG. 4 is a flowchart showing load detection signal correction operation showing another embodiment of the present invention, and FIG. 6 is a block diagram showing the structure of the present invention and a conventional elevator load detection device, and FIG. 6 is a block diagram of a conventional elevator load detection signal speed control calculation device. In the figure, (4) is the cage, (8) is the load detector, (8a) is the load detection signal, (10) is the speed control calculation device, (21)
(22) is a load fluctuation prediction calculation means, and (23) is a correction means. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In an elevator, a load detector is installed to detect the load inside the car, and a load detection signal outputted from the load detector is inputted to a speed control calculation device that controls the speed of the car. load fluctuation detection means for detecting the maximum value of the variation of the load detection signal during the car's operation; and load fluctuation detection means for detecting the load while the car is running based on the load detection signal while the car is stopped and a preset maximum acceleration/deceleration. Load fluctuation prediction calculation means for predicting and calculating the maximum value of the signal fluctuation, and correction means for correcting the load detection signal according to the difference between the output of the load fluctuation detection means and the output of the load fluctuation prediction calculation means. An elevator abnormality detection device characterized by: