JPH04325887A - Load condition display device - Google Patents

Abstract

PURPOSE:To always display the load condition of a motor control equipment in driving control. CONSTITUTION:A load characteristic fluctuation condition detector 1 detects the fluctuation condition of the load characteristic of a control equipment, and a load quantity operating part 2 operates the load quantity based on the detector value of the detector 1. A load quantity comparison part 3 compares the quantity of load with the value being set on the basis of the performance of control equipment, and a load condition display 5 displays the load condition of the control equipment, according to the output after comparison treatment of the load quantity comparison part 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load state display device for displaying a load state when a control device controlling the drive of an electric motor is controlling the drive of a controlled object.

0002

2. Description of the Related Art Conventional motor control equipment is provided with a safety device that generates an error when the current of the motor exceeds a certain value to protect the control equipment from danger.

0003

[Problems to be Solved by the Invention] However, since such conventional electric motor control equipment does not have a display means for indicating the load status during drive control, it is difficult for the user to check the load on the control target of the control equipment. There is a problem in that the state cannot be accurately recognized.

[0004] Furthermore, even though the occurrence of an error in the control equipment is approaching, the user cannot know the load margin until the occurrence of the error, which poses a risk of danger.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a load state display device that can accurately recognize the load state during drive control of a motor control device.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a load characteristic fluctuation state detection means for detecting a fluctuation state of load characteristics of a control device that performs drive control by an electric motor, and a load characteristic fluctuation state detection means for detecting a fluctuation state of load characteristics of a control device that performs drive control by an electric motor. load amount calculation means for calculating the load amount of the control equipment based on the detected value of the means; and a load amount for comparing the load amount obtained from the load amount calculation means with a value set based on the performance of the control equipment. The present invention is characterized by comprising a comparison means and a load state display means for displaying the load state of the control equipment in accordance with the output after comparison processing of the load amount comparison means.

[0007]

[Operation] In the above configuration, the load characteristic fluctuation state detection means detects the fluctuation state of the load characteristics of the control equipment, the load amount calculation means calculates the load amount based on the detected value of the detection means, and the load amount comparison means The load amount is compared with a value set based on the performance of the control equipment, and the load state display means displays the load state of the control equipment in accordance with the output after comparison processing of the load amount comparison means. can accurately recognize the load status during control of control equipment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the load status display device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a load status display device according to the present invention.

In FIG. 1, reference numeral 6 denotes an electric motor constituting a control device. Further, 7 is a load state display device according to the present invention, which includes a load characteristic fluctuation state detection section 1 and a load amount calculation section 2.
, a load comparison section 3, and a load state display section 5.

The load characteristic fluctuation state detection unit 1 includes a current detection circuit 1a that detects a fluctuation state of the current i of the electric motor 6, which is a load characteristic, and a rotation detection circuit 1a that detects a fluctuation state of the rotational speed N of the electric motor 6, which is a load characteristic. It is composed of a speed detection circuit 1b.

The load status display unit 5 also includes a green LED 5a and a yellow LED for displaying output in accordance with the load status of the control equipment.
It is composed of an ED 5b, a red LED 5c, and a decoder 4 that decodes the load status data from the load comparison section 3 and sends a selected output signal to the LEDs 5a, 5b, and 5c.

In this embodiment, first, the motor current detection circuit 1a and the motor rotation speed detection circuit 1b are connected to the motor 6, respectively.
The fluctuation state of the current i and the rotational speed N is detected. Based on this detected value, the load amount calculation section 2 performs predetermined calculation processing to obtain the load amount.

Next, in the load amount comparing section 3, the load amount is compared with a threshold value set in advance based on the performance of the control equipment, and through this comparison process, load status data is created and the data is output. Ru.

Next, the decoder 4 decodes the output load status data and sends selected output signals so that the LEDs 5a, 5b, and 5c display colors corresponding to the load status.

FIG. 2 is a conceptual diagram showing how the above embodiment displays colors in response to load conditions.

In FIG. 2, the load state of the control equipment is expressed by the load amount of the load amount calculating section 2, with the rated load being 100%.

The load amount representing this load state is determined by a threshold (I) set to the same value as the rated load in the load amount comparison section 3, and a threshold (II) set to a value between the rated load and the control equipment performance limit. ), load status data is created through this comparison process, and the data is output. The decoder 4 decodes this data and the LEDs 5a, 5
LEDs are installed so that b and 5c emit light according to the load condition.
Send selected output signals to 5a, 5b, and 5c.

In other words, when the load amount is 0 and the threshold (
When the load status data is between I), green L is displayed.
When the ED5a emits light and the load status data is between the threshold (I) approximation and the threshold (II) approximation, the yellow LED5b emits light and the threshold (
II) Yellow LE when load status data is greater than approximation
D5b emits light, and when the load state data is equal to or higher than the threshold (II) approximation, the red LED 5c emits light.

The user can accurately recognize the load condition by the light emitted from the LEDs 5a, 5b, and 5c.

[0021] In the above embodiment, the current and rotational speed were detected as the load characteristics and arithmetic processing was performed. However, the motor shaft torque, which is the load characteristic of the control equipment, may be detected by a torque sensor or the like and arithmetic processing may be performed.

FIG. 3 shows the display section of the above embodiment. The load status display surface 8 is composed of surface LEDs, and inside the load status display surface 8 there are green LEDs 5a, yellow LEDs 5b,
Red LEDs 5c are arranged in a matrix orderly and built-in, and the entire display surface is displayed in green, yellow, or red depending on the load condition by the LEDs 5a, 5b, and 5c. Furthermore, a current indicator 9 and a rotational speed indicator 10 are provided at the bottom of the load status display screen 8.

[0023] In the above embodiment, the load status is displayed in color on the entire display surface using surface LEDs composed of green, yellow, and red LEDs, but only three LEDs, one each of green, yellow, and red LEDs are used. Alternatively, the number of display colors may be increased by adding a threshold, or the load status may be displayed numerically using a 7-segment LED.

[0024]

As explained above, according to the present invention, the load characteristic fluctuation state detection means detects the fluctuation state of the load characteristics of the control equipment, and the load amount calculation means calculates the load amount based on the detected value of the detection means. The load comparison means compares the load amount with a value set based on the performance of the control equipment, and the load status display means displays the control equipment according to the output after the comparison process of the load comparison means. The user can always visually check the load status of the motor control equipment that is under drive control for the control target, and can accurately recognize the load status. Can be controlled safely.

Furthermore, when newly installing a motor control device, it can be easily determined whether the control capability of the motor control device is suitable for the object to be controlled.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a load status display device according to the present invention.

FIG. 2 is a conceptual diagram showing display states of the load state display device according to the present invention.

FIG. 3 is an external view showing a display section of the load status display device according to the present invention.

[Explanation of symbols]

1 Load characteristic fluctuation state detection section 1a Motor current detection circuit 1b Motor rotation speed detection circuit 2 Load amount calculation section 3 Load amount comparison section 4 Decoder 5 Load status display section 5a Green LED 5b Yellow LED 5c Red LED 6 Electric motor 7 Load status display device 8 Load status display screen 9 Current display meter 10 Rotation speed indicator

Claims (1)

[Claims] 1. A load characteristic fluctuation state detection means for detecting a fluctuation state of load characteristics of a control device whose drive is controlled by an electric motor, and a load amount of the control device is calculated based on a detected value of the load characteristic fluctuation state detection means. load amount calculation means for
load amount comparison means for comparing the load amount obtained from the load amount calculation means with a value set based on the performance of the control equipment; and the control according to the output after comparison processing of the load amount comparison means. A load state display device comprising: load state display means for displaying a load state of equipment.