JPS63224697A - Controller for motor - Google Patents

Abstract

PURPOSE:To display abnormal cause data on a display section after a power supply is switched on again by writing abnormal cause data to a memory cell when abnormality is generated. CONSTITUTION:When an abnormal state such as overload occurred in an induc tion motor IM, a CPU 3 transmits an operation mode to an abnormal interrup tion routine, and operation is shifted to abnormality processing operation. The CPU 3 reads abnormal data from a protective circuit 6, and writes the abnormal data to the abnormal-data writing address of an EEPROM 5 while displaying abnormal contents to a display section LED2 based on the abnormal data. When a power supply is closed again, the CPU 3 is set under an initial state, and the data of control conditions written in the EEPROM 5 and the data of the abnormal contents are transferred to a built-in RAM 3a. An user can confirm an abnormal cause again by the display of the display section LED2.

Description

[Detailed description of the invention] [Technical field] The present invention relates to a control device for an X-motor.

[Background technology] Conventionally, control devices for inverter circuits that use microcomputers to drive induction motors have been equipped with digital switches, variable resistors, etc. to set control conditions. Therefore, even if an attempt is made to increase the number of control conditions and increase the freedom of the user's usage conditions, there is a problem in that the base and cost are restricted.

Further, when setting with a digital switch or volume, it is difficult to understand without effort what state the current setting value is, and the setting is complicated.

In general, when a control I device that controls an inverter circuit is incorporated into an actual system, it is often configured with a sequence that cuts off the system power supply to protect the load side when an abnormality occurs.

Although inverter circuits and the like are equipped with an FI function that diagnoses and displays the cause of an abnormality, there is a problem in that this display itself is erased when the system power supply is cut off. In addition, in order to continue displaying for m, it was necessary to back up the control circuit and power supply with a backup power supply.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to provide an electric motor control device that allows reconfirmation when an abnormality occurs when the power is turned on again without using a backup power source. is to provide.

[Disclosure 1 of the Invention The present invention provides a switch means for setting control condition data in a control circuit that controls an inverter circuit that drives an electric motor, and a display section that displays the data of the conditions set by the switch means. , a RAM for storing data on set control conditions, and a rewritable non-volatile memory element for rewriting and storing data on control conditions when setting changes are confirmed, and the memory element stores data on the control conditions at the start of operation. In a motor control device that transfers data to RAM, abnormality interrupt 8! writes abnormality cause data to the storage element when an abnormality occurs! RAM at the start of operation.
The present invention is characterized in that a mode in which the abnormality cause data transferred to the computer is displayed on the display section can be set by the switch means.

The present invention will be explained below with reference to Examples.

FIG. 11 shows an embodiment of the present invention, in which the inverter circuit 1 controls the switching of the switching cables Q, -Q by on/off commands from the control circuit 2, and operates the induction motor IM.
It controls the rotation of.

The entire control circuit 2 is controlled by a one-chip microcomputer (hereinafter abbreviated as CPU) 3. '? In response to the signal from the buried operation switch SW0, on/off command signals U, V, and W corresponding to the instructions from the frequency setting device 4 are output, and control conditions are set using the signals from the switches SW1 to SW. The conditions are displayed on the display section ED, , LED, and written into the EEPROM 5, and when an abnormality occurs, the abnormality cause signal from the protection circuit 6 is determined and displayed on the display section ED.

The error is displayed on LED2 and the details of the error are displayed on the EE.
It performs the operation of writing into PROM5.

Next, the operation of the electric motor control device according to the present invention will be explained with reference to chart 70 of MS2 diagram.

First, when the 3-phase AC power supply AC of the device is turned on and the DC power supply CC is supplied from the power supply circuit E to the control circuit 2, the CPU 3 starts operating according to the built-in program.
The memory contents of RAM 3a are cleared by -H and initialized. After this initialization, the data stored in the EEPROM 5, such as the previous operating conditions and the final abnormality details, are read and written into the internal RAM 3a.

Next, the CPU 3 determines the mode, determines that the mode is 0'' since it is in the initial state, and displays the display section E D .

00'' is displayed on the driver 7.8, and 000'' is displayed on the display LED 2 through the driver 7.8. Here, the modes include setting modes for increasing and decreasing the rotation speed, V/F ratio of PWM control, braking time, and maximum frequency, as well as a mode for reconfirming the cause of the abnormality. This is possible.

In this initial display state (mode number is 0''), the induction motor IM can be started.

In other words, if the setting conditions are not changed, the inverter circuit 1 can be controlled to drive the induction motor rM according to the previous setting conditions. If you operate switch SW here,
Based on the operation of this switch SW, the CPU 3 advances to the current mode plus "1" to the number, and stores the current setting data corresponding to this mode in the built-in RAM 3.
A is read out and displayed as a three-digit number on the display section LED2, and a mode number is displayed on the display section LED.

To change the setting conditions currently displayed on the display LED 2, just operate the switch SW2. In this case, the CPU 3 stores the data of the next setting condition in the same mode in the internal ROM of the CPU 3 The contents are read out from the display unit LED2 and displayed on the display unit LED2. If the displayed contents meet the desired setting conditions, the user only has to operate the switch SW.

In other words, the switch SW is a switch that determines the conditions,
When the switch SW is turned on, the CPU 3 replaces the data of the mode written in the built-in RAM 3m and the EEPR 0M5 with the setting condition data of the predetermined mode read for the above change. When this rewriting is completed, the mode judgment state is entered again.

By the way, if the setting conditions displayed by operating the switch SW2 are not the desired conditions, the switch SW3 may not be operated and the switch SW2 may be repeatedly operated until the desired setting conditions are achieved.

If you want to stop changing the conditions, you can move to the next mode V display by operating the switch SW without operating the switch SW. Also, if you only want to check the setting conditions of a predetermined mode, it is best to repeat the operation of the setting switch SW1. In this case, the mode will change sequentially, and each time the display mode number on the display LED and the display mode number on the display LED 2 will be displayed. The data of the setting conditions are sequentially switched and displayed.

When the setting conditions of each mode are successively changed or confirmed and returned to the initial mode number 0'', the mode becomes ready for activation.

Now, in this mode "O"', turn on the operation switch SW. When the switch is turned on to the starting side, the CPU 3 senses this turning on and outputs on/off command signals U, V, and W based on the control conditions written in the built-in RAM 3a. These command signals U, V, and W are sent to the switching elements Q1 to Q6 via the buffer 9 and the pace driver 10 of the inverter circuit 1.
is switched to drive the three-phase induction motor rM.

The operating frequency during this drive is displayed f under the control of CPU3.
Displayed by f1sLED2.

By the way, when an abnormal state such as an overload occurs in the induction motor IM and the protection circuit 6 detects an increase in the voltage across the detection resistor R due to this abnormal state, an abnormality detection signal is output from the protection circuit 6 and the latch 11 is activated. An interrupt signal NT is given to the CPU 3 through the CPU 3. This interrupt causes the CPU 3 to jump to the abnormality interrupt routine shown in FIG. 3, and then proceed to the abnormality handling operation.

In other words, CPU3 that jumps to the abnormal interrupt routine is turned on/
The output of the off command signals U, V, and W is stopped, and the induction electric fi
Stops IM operation and simultaneously sends abnormal signal TS
This abnormal signal TS causes the disconnection relay inserted in the power supply circuit to turn off and stop the power supply to the inverter circuit 1 and control circuit 2. A smoothing capacitor is installed in the power supply circuit. Since there is C8, capacitor C
Power is supplied from the power supply circuit E and the control circuit 2 maintains operation for a certain period of time until the charge of C is released.
The PU3 reads the abnormal data from the protection circuit 6, writes this abnormal data to the abnormal data write address of the EEPROM 5, and displays J% normal content on the display LED 2 based on the abnormal data, and switches this display to the reset switch SW. , is maintained until there is a repetition of .

Then, the reset switch SW is not turned on and the control circuit 2
The power supply to the device will be completely cut off, and the entire device will stop operating completely.

By the way, when the reset switch SW is turned on when the above-mentioned abnormality is displayed, or when the power is turned on again after the operation of the device is stopped, the CPU 3 is set to the initial state, and the EEPROM,
The control condition data written in No. 5 and the data on the abnormal content of V are transferred to the built-in RAM 3a. If the restart is performed during this transfer, if the above-mentioned abnormality is not resolved, the protection circuit 6 will detect the abnormality and the above-mentioned interrupt will occur.
Jumping to the above-mentioned abnormality interrupt routine, when the switch SW1 is repeatedly operated to set the abnormality display mode at the time of mode determination, the contents of the abnormality that occurred during the previous operation are displayed on the display section LED2. The user should use this display
The cause of the abnormality can be reconfirmed by the display on LED2.

[Effect of the Invention J] The present invention provides an electric motor control device configured as described above, which is equipped with an abnormality interrupt function that writes abnormality cause data into the storage element when an abnormality occurs, and which also has an abnormality interrupt function that writes abnormality cause data to the RAM at the start of operation. Since the mode displayed on the display section can be set using the switch means,
Is the VC placed when an abnormality occurs? ! ! Even if the power supply is cut off, the data on the cause of the abnormality can be displayed on the display unit after the power is turned on again, so that the cause of the abnormality can be reconfirmed and maintenance of the device n becomes easier.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 and f5
FIG. 3 is a 70-chart for explaining the operation of the same as above. 1... Inverter circuit, 2... Control circuit, 3...
CPU, 3a--internal MRAM, 5-EEPROMSS
W. ~SW,...switch, LED, 1. ED2...
This is the display section.

Claims (1)

[Claims] (1) A switch means for setting control condition data in a control circuit that controls an inverter circuit that drives an electric motor, a display section that displays data on the conditions set by the switch means, and a display section for displaying data on the conditions set by the switch means; It is equipped with a RAM that stores condition data, and a rewritable nonvolatile memory element that rewrites and stores the control condition data when setting changes are confirmed.
The control device for the electric motor to be transferred to the AM has an abnormality interrupt function that writes abnormality cause data to the storage element when an abnormality occurs, and also has the switch to set a mode in which the abnormality cause data transferred to the RAM is displayed on the display unit at the start of operation. A control device for an electric motor, characterized in that settings can be made by means.