JP2644014B2 - Motor control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric motor control device.

[Related Art] Conventionally, as a control device for controlling an electric motor, there has been a device capable of performing program control. This control device capable of program control is capable of automatically controlling the operation of the motor based on the program contents stored in advance in the storage means of the operation contents of the motor. This is a very useful device because any electric motor can be controlled simply by inputting.

[Problems to be Solved by the Invention] Since a control device of this type does not accept the operation of the electric motor during the input of the program, it is generally configured to accept the operation from the end of the input of the program. If the operation switch for giving the driving operation is provided not in the vicinity of the device for performing the program input but in a remote position, and when the operation switch is left in the state of being turned on to the starting side, the motor is turned on at the same time as the end of the program input. Driving is started and there is a problem that it is very dangerous for the operator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to operate a driving switch at the end of a program input even if a driving switch is operated without the operator's knowledge during the program input. An object of the present invention is to provide a control device for an electric motor in which start is regulated so that no harm is given to an operator.

Means for Solving the Problems According to the present invention, when there is a driving operation, control means for controlling the operation of the electric motor based on the program contents stored in advance in the storage means, and program means for inputting the program to the storage means In a motor control device that does not accept a driving operation during the program input period, the state of the operation switch at a remote position remote from the device is detected at the end of the program input period, and the operation switch is turned to the driving side. If so, a means for generating an abnormal output, and stopping the reception of the operation command of the control means until it is reset and returned to the initial state is provided.

[Operation] The motor control device of the present invention determines the presence or absence of an operation command at the time when the input of the program is completed, and generates an abnormal output if there is the operation command. It is possible to prevent the operation of the motor from being started at the same time as the end of the input of the program, thereby preventing the operator from being harmed.

[Embodiment] Fig. 1 shows a circuit of an embodiment of a motor control device according to the present invention. In this embodiment device, an inverter circuit 1 is used as a driving means of the motor. oN / oFF command from 2 to control the switching of the switching elements Q ₁ to Q ₆ and controls the rotation of the induction motor IM. The control circuit 2 is managed by a one-chip microcomputer (hereinafter abbreviated as CPU) 3 and receives a signal from an operation switch SW ₄ (SW ₄ ′) in advance to control a built-in RA.
On / off command signals U, V, based on frequency setting data stored in M3a or frequency setting data from an external control device such as a sequencer or a reference input source such as a variable resistor VR.
W is to be output. The control circuit 2 is controlled condition signal of the switch SW ₁ to SW _3, i.e. the control program is not set, performs the operation of writing the EEPROM5 and displays them setting condition on the display unit LED _1, LED _2, furthermore the abnormal Sometimes, the display unit LED ₁ , LED ₃ , LED ₃ , LED ₃ , LED 3
_{In step 2, an} abnormality is displayed, and at the same time, the contents of the abnormality are written into the EEPROM 5, and at the same time, an abnormality signal ST for causing the interruption relay 7 to draw out the main contact S of the main circuit to perform an interruption operation is output.

Next, the basic operation of the motor control device will be described with reference to the flowchart of FIG.

First, when the three-phase AC power supply AC of the apparatus is turned on and a DC power supply Vcc is supplied from a power supply circuit (not shown) to the control circuit 2, the CPU
3 starts operation by the built-in program.
Is cleared once and initialization is performed. After this initialization, data such as the previous operating condition and the content of the last abnormality stored in the EEPROM 5 is read and written into the internal RAM 3a. That is, the initial data is read.

Next, the CPU 3 performs a mode determination. In this case, the mode is the initial state, and thus the mode is determined to be “00”. At this time, the display LED ₁
Is displayed as “00”. If the mode is determined to be "00", "000" is driven and displayed on the display LED ₂ through a driver (not shown). Here, the modes include a program setting mode for setting the rotation speed increase (acceleration control), decrease (deceleration control), constant speed control, V / F ratio of PWM control, brake time, and maximum frequency. you can be sequentially switched set by operating the mode switch SW _1. The illustrated mode determination is only the determination of the program setting mode, but of course includes a routine for performing another mode determination.

The induction motor IM can be started in the initial display state (mode number is "00").

That is, if the set conditions are not changed, the inverter circuit 1 can be controlled based on the previous set conditions to drive the induction motor IM. Here proceed to the current mode number on the basis of the operation of the mode switch SW ₁ to "1" plus the mode, built-in the current configuration data corresponding to this mode RA
The data is read from M3a and displayed on the display LED ₂ with a three-digit number, and the mode number is displayed on the display LED ₁ . To change the setting condition currently displayed on the display unit LED ₂ , the data setting switch SW ₂ may be operated.In this case, the CPU 3 registers the data of the next setting condition in the same mode. The CPU 3 reads from the built-in RAM 3a of the CPU 3 and displays the contents on the display unit LED ₂ .

The user, if the display content desired setting condition may be operating the memory switch SW _3. The storage switch SW ₃ is a switch condition determination, when the switch SW ₃ is turned CPU3 for the data setting condition of a given mode read for the above changes, is written to the internal RAM3a and EEPROM5 Overwriting the data of the corresponding mode. When this rewriting is completed, a mode determination state is set. That is, the program setting is completed for each condition setting, and when setting or correcting each condition, the following may be repeated.

If setting condition is displayed by the operation of the data switch SW ₂ is not a desired condition, without operating the memory switch SW _3, until the desired setting condition may be operating a data switch SW ₂ is repeated . Also without operating the memory switch SW ₃ if you want to stop the conditions change, by operating the mode switch SW ₁ it is sufficient to migrate to the display of the following modes. If you only want to check the setting conditions for a given mode,
Well Repeated operation of the setting switch SW _1, this mode is successively switched, a display mode number of the display unit LED ₁ each time, and the data of the setting condition of the display unit LED ₂ are sequentially switched and displayed. Note should be put reset switch SW ₅ If you want to return the configuration data to the initial state.

When the change (or confirmation) of each setting condition is sequentially completed, it is determined whether or not the operation switch SW ₄ or the operation switch SW ₄ ′ connected to the remote control terminal is turned on at the end point. The CPU 3 performs the operation, and returns to the initial mode number “00” if it is not the start side, and is in a startable state.

If it is on the starting side, it is determined that an error has occurred and the motor stop control state is maintained, and at the same time, an error display is displayed on the display unit LED ₂ based on the error data, and this display is reset by the reset switch SW. _It keeps it until there is ₅ operations. That is, it is possible to prevent the induction motor IM from being inadvertently driven without the operator's knowledge.

Now the command signal U, V, W drives the three-layer induction motor IM by switching the switching elements Q ₁ to Q ₆ via the base driver 4 of the inverter circuit 10.

The operating frequency during this drive is controlled by the display unit LE under the control of CPU3.
Displayed by D _2.

Next, if an abnormal state such as overload occurs in the induction motor IM, the additional current increases. Due to this increase, the voltage across the detection resistor R increases, and when this increase is detected by the protection circuit 6, an abnormality detection signal is output from the protection circuit 6 and an abnormal interrupt signal is given to the CPU 3. With this interrupt, the CPU 3 skips the operation mode to the abnormal interrupt routine and shifts to the abnormal processing operation.

That is, the CPU 3 jumped to the abnormal interrupt routine stops the output of the on / off command signals U, V, W, stops the operation of the induction motor IM, and simultaneously generates the abnormal signal ST,
The contact S of the cut-off relay 7 inserted into the power supply circuit is turned off by the abnormal signal ST to stop the power supply to the induction motor IM. On the other hand, during this time, the CPU 3 of the control circuit 2 stores the abnormal data once written in the internal RAM 3a from the protection circuit 6 into the EEPROM 5.
It writes the abnormal data write address, to display the error details to the display unit LED ₂ on the basis of the abnormal data, to maintain the display until the operation of the reset switch SW _5. When the power supply to the control circuit 3 is completely stopped, the operation of the entire apparatus is completely stopped.

When turning the power on again after the stop of the operation of the abnormality display or device turning on the reset switch SW ₅ when, CPU 3 is set to the initial state, the internal data of the data and the abnormal content control conditions written in EEPROM5 Transfer to RAM3a. If the system is restarted after this transfer, if the abnormality is not resolved, the abnormality is detected by the protection circuit 6 and the above-mentioned interrupt occurs, and the process jumps to the above-mentioned abnormal interrupt routine. Switch SW
By operating ₁ to set the abnormality display mode, the contents of the abnormality that occurred during the previous operation are displayed on the display unit LED ₂ . The user can reconfirm the cause of the abnormality by displaying the LED _{2 on} the display.

[Effect of the Invention] The motor control device of the present invention detects the state of the operation switch at a remote position remote from the device at the end of the program input period, and generates an abnormal output if the operation switch is on the operation side. Therefore, it is possible to notify the operator who has input the program of the abnormality, and to stop the reception of the operation command of the control means. This has the effect of preventing harm.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the embodiment. IM is an induction motor, SW ₁ is a mode switch, SW ₂ is a data switch, SW ₃ is a memory switch, SW ₄ and SW ₄ ′ are operation switches, SW ₅ is a reset switch, 1 is an inverter circuit,
Denotes a control circuit, 3 denotes a CPU, and 3a denotes a built-in RAM.

Claims (1)

(57) [Claims] A control means for controlling the operation of the electric motor based on the contents of a program stored in a storage means in advance when a driving operation is performed; and a program means for inputting the program to the control means. In a motor control device that does not accept driving operation during the program input period,
At the end of the program input period, the state of the operation switch at a remote position remote from the device is detected, and if the operation switch is on the operation side, an abnormal output is generated and the operation command of the control means is reset until the operation returns to the initial state. A control device for an electric motor, comprising: means for at least stopping reception.