KR970008365B1 - Invertor speed control method with multi-step - Google Patents

Abstract

The multistage speed operation method of an inverter comprises the steps of combining external control input signals as listed in the following table(1) applied to control terminals(P1,P2,P3) and operating an electric motor in seven cycles by using predetermined set accelerating/decelerating time(t), constant speed time(s), domain selection(d), and multistage speed(f) data.

Description

Inverter Multistage Speed Operation Method

1 is a configuration diagram of a multi-stage speed operation apparatus of a conventional inverter.

2 is a multi-stage speed display according to terminal input in FIG.

3 is a diagram illustrating a multi-stage speed operation state with respect to terminal inputs.

4 is a configuration diagram of a multi-stage speed operating device of the inverter of the present invention.

5 is a multi-stage speed display by terminal input in FIG.

6 is a diagram illustrating a multistage speed operation state with respect to terminal inputs.

7 is a multi-stage speed operation state diagram according to the setting data in the present invention.

8 is a diagram illustrating another operation state of terminal input and multi-speed in the present invention.

* Explanation of symbols for main parts of the drawings

1: AC power supply 2: Inverter

3: motor 4: foldable part

The present invention relates to a multi-stage speed operation method of an inverter, and more particularly, to a multi-stage speed operation method of an inverter adapted to be suitable for cycle stroke operation according to an external terminal input when a motor is driven.

1 is a configuration diagram of a multi-stage speed operation apparatus of a conventional inverter. As shown in FIG. 1, an inverter 2 for multi-stage operation of an electric motor 3 according to an internal program by combining external control signals and a control of the inverter 2 are shown. The terminal Fx, P ₁ , P ₂ , P ₃ , JOG is composed of a contact unit 4 for applying an external control signal for multi-stage operation. Reference numeral 1 denotes an AC power source.

In the multi-stage driving apparatus of the conventional inverter configured as described above, the inverter 2 is a device that rectifies the AC power source 1 into the DC power source and converts the electric motor 3 back into AC in order to drive the variable speed.

At this time, the inverter 2 receives a signal of a contact or a switch from the outside through the contact unit 4 as a control input for multi-stage speed operation.

The external input signals of FIG. 1 are used in combination with each other.

That is, when an external control signal such as a second degree is input to the control terminals Fx, P ₁ , P ₂ , P ₃ , and JOG through the contact unit 4, the inverter 2 controls the control terminals Fx, P ₁ , and the like. Combining P ₂ , P ₃ and JOG) operates the motor 3 at a speed corresponding to each pre-programmed therein.

3 shows the respective speeds of the external control signals in FIG.

In this way, it is possible to drive the electric motor 3 at a desired speed by arbitrarily operating an external control signal.

However, when the multi-stage speed operation by the external terminal has a large number of multi-stage speed, there is a disadvantage that the number of control input terminals must be large. Therefore, there is a disadvantage that can not be applied in the case of multiple administrations.

The present invention provides a multistage speed operation method of an inverter capable of performing various multistage speed operations and multiple cycles with a small number of external control inputs.

4 is a configuration diagram of the multi-stage speed operation device of the inverter of the present invention, as shown in the drawing, in which an AC power source 1 is connected to an input terminal, and an inverter 2 to which an electric motor 3 is connected to an output terminal is connected to a contact portion 4. Combining the external control signals coming into the control terminals (P ₁ , P ₂ , P ₃ ) through the built-in program to configure the multi-speed operation of the motor 3, with reference to the accompanying drawings will be described in detail Same as

In the case of the multi-stage speed and stroke operation when driving the motor 3 by the inverter 2, the control input signal uses an external signal.

That is, a program is stored in the internal memory of the inverter 2 using an on / off signal applied between P ₁ -CM, P ₂ -CM, and P ₃ -CM of the inverter 2 through the contact unit 4. The motor 3 is operated by selecting the completed stroke.

5 shows the respective strokes for driving the electric motor 3 in accordance with external control input signals applied to the control terminals P ₁ , P ₂ , P ₃ of the inverter 2.

That is, seven cycles are configured by the combination of external control input signals, and one cycle is composed of eight speeds. Therefore, the overall multi-stage speed is adjustable up to 56 (7 strokes x 8 speeds).

If necessary, each step can be assigned as many speeds as necessary within 8 strokes.

For example, 1 stroke can be adjusted to 8 speeds, 2 strokes to 5 speeds, 7 strokes to 7 speeds, and so on.

6 shows the operation programmed in the memory of the inverter 2 according to the external control input signal. That is, the inverter 2 is capable of a plurality of multi-speed operation and seven stroke operation according to the external control input signal input to the control terminal (P ₁ , P ₂ , P ₃ ).

At this time, the data necessary for the multi-stage speed operation is programmed in the inverter 2 in advance to start the operation according to the terminal operation.

For example, as shown in FIG. 7, in order to set stroke 1, the deceleration acceleration time (1t-8t), the constant speed time (1s-8s), and the stationary range required for the multistage speed from 1 speed to 8 speeds Multistage speed operation is performed by inputting selection (1d-8d) and multistage speed (1F-8F) in advance.

First, the inverter 2 receives the input of the P ₁ terminal and operates at a speed of ₁ F in a forward direction of 1 d with 1 t acceleration / deceleration operation according to preset data. After driving for 1s constant speed, it reaches 2t acceleration and deceleration time and 2d speed in the forward direction of 1d and then drives up to 2s constant time.

When such operation is performed up to eight speeds, one stroke ends and one-stroke multi-speed operation is completed.

On the other hand, in another embodiment of the multi-stage speed operation of the present invention, the operation of the input terminal is performed differently.

That is, as shown in FIG. 8, the external control input signals inputted to the control terminals P ₁ and P ₂ of the inverter 2 allow the stroke to be selected, and the external control input signals inputted to the control terminal P ₃ . When is used as the progress input of the multi-stage speed operation, up to three strokes can be selected by the combination of the control terminals.

Each of these strokes is programmed in the internal memory of the inverter and one stroke consists of eight speeds. In addition, the number of multi-step speeds of each stroke can be adjusted.

Therefore, it is possible to perform many multi-speed inputs and multiple strokes with a small number of terminal inputs.

As described above, the present invention can operate an electric motor at multiple speeds and multiple strokes by combining external input signals inputted to a small number of control terminals, and the multiple speeds can be adjusted as necessary.

Claims (3)

The acceleration / deceleration time (t), constant speed time (s), and range selection (d) set in advance by combining external control input signals as shown in Table 1 below, which are applied to the control terminals P ₁ , P ₂ , and P ₃ . ), The multi-stage speed operation method of the inverter, characterized in that by operating the motor in seven strokes using the multi-stage speed (F) data. TABLE 1 (1: on, 0: off) 2. The operation according to claim 1, wherein the input signals of the control terminals P ₁ and P ₂ are used as stroke selection signals and the input signals of the control terminals P ₃ are operated in three strokes as the progress input of the multi-stage speed operation. Multi-speed operation method of the inverter. 3. The method of claim 1 or 2 wherein each stroke is adjustable within up to eight speeds.