JP2012019584A - Ac motor starting current control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation control device capable of responding to customers' demands quickly.SOLUTION: A starter 60 has: a memory 63 in which eight operation patterns of an output to an induction motor are stored; and an operation controller 64 that adjusts the output to the induction motor from start to stop according to one operation pattern selected from the eight operation patterns. The starter 60 can easily select the operation pattern since the operation controller 64 adjusts the output to the induction motor based on the operation pattern selected by an input from an operation panel 62.

Description

  Control the starting current.

A rotary power device that controls the rotation of a rotary power load is installed between a power source and a rotary power load such as an electric motor that is a load, and controls the number of rotations and torque for start, operation, and stop, respectively. A device described in Patent Document 1 is known as such a rotation control device.
The controller for a control panel described in Patent Document 1 includes an operation display unit and a control input / output unit. The operation display unit connected to the network by the network connection device can set and monitor the setting data written in the EEPROM by the switch unit and the display means.

JP-A-6-225416

  However, the controller for the control panel described in Patent Document 1 enables operation from a remote location by being able to control the power load by a network. For example, the control of the motor of the belt conveyor or the spiral for pumping water is possible. A rotation control device used for pump control or the like needs an operation pattern suitable for each application. Therefore, when shipping the rotation control device as a product, it is necessary to prepare a rotation control device in which an operation pattern according to the customer's application is set each time a request from the customer is received. Therefore, complicated work occurs each time.

  Accordingly, an object of the present invention is to provide a rotation control device that can quickly respond to a request from a customer.

  The rotation control device according to the present invention includes a storage unit that stores a plurality of operation patterns of output to a rotation power load, and the rotation power from start to stop along one operation pattern selected from the plurality of operation patterns. And a control means for adjusting the output to the load.

According to the rotation control device of the present invention, a plurality of operation patterns for each application are stored in the storage means, and control is performed along one operation pattern selected from the plurality of operation patterns. The control means preferably adjusts the output to the rotational power load based on an operation pattern selected by input from the operation panel.
By making the operation pattern selectable from the operation panel, it can be selected at the time of factory shipment or selected at the installation site.

  The control means preferably adjusts the output to the rotational power load based on the setting of the output control parameter of the operation pattern input from the operation panel. By making it possible to adjust the setting of the output control parameter of the operation pattern from the operation panel, it is possible to make fine adjustments while moving the power load at the installation site.

  The rotation control device of the present invention is prepared for each application by the control means adjusting the output to the rotational power load from start to stop along one operation pattern selected from a plurality of operation patterns. Since it is not necessary, it is possible to respond quickly to requests from customers.

It is a connection diagram about the motor control system according to the embodiment of the present invention. It is a block diagram which shows the structure of the starter of the electric motor control system shown in FIG. It is a figure which shows the operation panel of a starter. (A) And (B) is a figure which shows an example about an operation pattern. (A) to (G) are diagrams showing display examples of operation pattern selection and output control parameter setting. (A) to (D) are diagrams showing display examples of selection of operation patterns and setting of output control parameters.

  A starter will be described as an example of a rotation control device according to an embodiment of the present invention with reference to the drawings. FIG. 1 is a connection diagram of an electric motor control system according to an embodiment of the present invention. An electric motor control system 10 according to the present embodiment shown in FIG. 1 controls the rotation of an induction motor M that operates by three-phase AC from a power receiving / transforming facility E.

  A rotation control device according to an embodiment of the present invention will be described with reference to the drawings using a starter as an example. FIG. 1 is a connection diagram of an electric motor control system according to an embodiment of the present invention. An electric motor control system 10 according to the present embodiment shown in FIG. 1 controls the rotation of an induction motor M that operates by three-phase AC from a power receiving / transforming facility E.

  The motor control system 10 includes an earth leakage breaker 20 connected to the power receiving / transforming equipment E, a main electromagnetic contactor 30 connected to the earth leakage breaker 20, a bypass electromagnetic contactor 40 connected to the main electromagnetic contactor 30, and a thermal A protector 50, a starter 60 connected in parallel to the bypass electromagnetic contactor 40 and the thermal protector 5, and an output terminal block 70 connected to an induction motor M as a power load are provided.

  The earth leakage breaker 20 detects the earth leakage current and breaks the circuit, and can be used with a capacity and a set current that allow the induction motor M to be directly turned on. The main electromagnetic contactor 30 and the bypass electromagnetic contactor 40 open and close a contact by an electromagnet provided inside. At the time of steady operation of the induction motor M, power is supplied from the bypass electromagnetic contactor 40 side. The thermal protector 50 is used for overload protection of the induction motor M, and the operation becomes effective after the bypass electromagnetic contactor 40 is activated.

  The starter 60 performs control from the start to the stop of the induction motor M that is a rotational power load. Here, the configuration of the starter 60 will be described in detail with reference to FIGS. 2 and 3. FIG. 2 is a block diagram showing the configuration of the starter of the motor control system shown in FIG. FIG. 3 is a diagram showing an operation panel of the starter.

  As shown in FIG. 2, the starter 60 includes a voltage / current control circuit 61, an operation panel 62, a memory unit 63, and an operation control unit 64. The voltage / current control circuit 61 controls a three-phase alternating current input from an input terminal (not shown) according to an instruction from the operation control unit 64 by using a thyristor circuit and outputs it to an output terminal (not shown).

  As shown in FIGS. 2 and 3, the operation panel 62 includes a display panel 62a, a lamp 62b, and an input unit 62c. The display panel 62a functions as a display unit that displays various settings and operation states (such as error display). In the present embodiment, a liquid crystal panel is employed as the display panel 62a. The lamp 62b includes a lamp (POWER lamp) indicating a primary energized state and a lamp (RUN lamp) indicating that the operation control unit 64 is operating. In the present embodiment, an LED is employed as the lamp 62b. The input unit 62c includes a push button switch such as a “MODE” button or a “FUNC” button and a seesaw switch such as an “AUTO-MENU” switch.

  The memory unit 63 shown in FIG. 1 is a non-volatile memory that functions as a storage unit that stores a plurality of operation patterns for operating the induction motor M. The memory unit 63 stores various output control parameter settings in addition to the operation pattern. In the present embodiment, eight operation patterns are stored in the memory unit 63.

Here, the operation pattern stored in the memory unit 63 will be described with reference to FIG. FIG. 4A and FIG. 4B are diagrams showing an example of an operation pattern. Operation pattern 3 shown in FIG. 4A is a pattern used for operation of a multistage turbo blower that requires a dangerous speed avoidance start. The operation pattern 7 shown in FIG. 4B is a pattern used for operation of a centrifugal separator, a heavy load high-speed rotating machine, a machine with a flywheel, etc. that require soft start / stop for heavy inertia loads. It is. In addition to the operation patterns 3 and 7 shown in FIG. 4, the memory unit 63 stores eight operation patterns 1 and 2 and operation patterns 5 to 6 and 8 in total.
In each operation pattern, values indicating the output voltage and the output current are stored in the memory unit 63 as data in time series.

The operation control unit 64 reads one operation pattern selected from a plurality of operation patterns from the memory unit 63, and controls the output to the induction motor M from start to stop along the operation pattern. It functions. In addition, the operation control unit 64 has a function of displaying the display panel 62a in accordance with an input from the input unit 62c, or performing setting and storing in the memory unit 63.
The operation control unit 64 can be formed by a microprocessor that functions as a CPU, a ROM that stores a program, a RAM that is used as a work area, and a peripheral circuit. The ROM can also be used as the memory unit 63.

  The output terminal block 70 is provided with a total of four or more terminals, that is, three terminals to which outputs from the starter 60 and the thermal protector 50 are connected and one terminal connected to the ground, and If it is a thing more than the rated voltage and the electric current of the induction motor M, it can be used. The output terminal block 70 and the induction motor M are connected by a four-core cable including a ground wire.

  The use state and operation of the starter 60 according to the embodiment of the present invention configured as described above will be described with reference to FIGS. 1 to 4 and FIGS. 5 and 6. FIG. FIG. 5A to FIG. 5H are diagrams showing display examples of operation pattern selection and output control parameter setting. FIG. 6A to FIG. 6D are diagrams showing display examples that are subsequently displayed from FIG.

First, the user selects an operation pattern to be used, and inputs an output control parameter setting for the operation pattern. For example, if the operation pattern A shown in FIG. 4A is pattern 3, first, when the display panel 62a is in the initial screen state (see FIG. 5A), the “MODE” button of the input unit 62c is set to a predetermined value. Press the number of times.
The “MODE” button is a button capable of switching between the operation mode of the operation control unit 64 and the display on the display panel 62a. In this embodiment, the operation pattern selection mode is set by pressing the third time (see FIG. 5B).

When the display panel 62a displays the operation pattern selection mode, the “SET” button is pressed. By pressing the “SET” button, first, the operation pattern 1 is selected (see FIG. 5C).
Then, the operation pattern 3 is selected by pressing the “UP” button twice (see FIG. 5D). In this way, the operation of the induction motor M can select the pattern 3.

  Next, each output control parameter of the operation pattern 3 is set. As shown in FIG. 4A, the output control parameter is set by starting voltage EPr. 1, starting voltage EPr. 1 to increase target voltage EPr. 2, starting voltage EPr. 1 to increase target voltage EPr. The time Tpr1 required to increase the voltage to 2 and the target voltage EPr. 3, target voltage drop EPr. 3 to stop voltage EPr. 4. Target voltage EPr. 3 to stop voltage EPr. 4 time TPr. 2 items.

When the display panel 62a shows the operation pattern 3 shown in FIG. 5D, the “MODE” button and the “SET” button are pressed simultaneously. Then, the display panel 62a becomes a setting display of the time TPr1 (see FIG. 5E).
Therefore, the time can be input by pressing the “SET” button again, and the time is input by pressing the “UP” button or the “DOWN” button (see FIG. 5F). In this example, 15 seconds are set. When the desired time value is reached, the setting is registered by pressing the “SET” button, so that the time TPr. The display returns to the setting display 1 (see FIG. 5G).

Next, by depressing the “UP” button, the time TPr. 2 (see FIG. 5H), the time TPr. In the same procedure as when 1 was set, the time TPr. 2 and the start voltage EPr., Which is another output control parameter setting. 1, increase target voltage EPr. 2, target voltage drop EPr. 3, stop voltage EPr. Set 4 in order.
Each voltage is set at a ratio to the output voltage. For example, the start voltage EPr. 1 is 30%, the increase target voltage EPr. 2 is 60%, the target voltage drop EPr. 3 is 50, the stop voltage EPr. 4 is 25% or the like.

Stop voltage EPr. When the setting of 4 is completed, it is displayed on the display panel 62a that the setting of the operation pattern 3 is stored in the memory unit 63 by the operation control unit 64 as shown in FIG.
Then, by depressing the “FUNC” button, it is possible to return to the original display shown in order in FIG. 6B and FIG. 6C and finally return to the initial screen shown in FIG.

  When the operation control unit 64 operates the induction motor M, the output voltage is adjusted according to the output instruction of the operation pattern 3 in which each output control parameter is set, and the induction motor M is operated. In the operation pattern 3, the operation control unit 64 applies the start voltage EPr. To the thyristor circuit of the voltage / current control circuit 61 two seconds after receiving the activation instruction. 1 is output. Next, the operation control unit 64 gradually increases the output voltage to the target voltage EPr. Up to 2 hours TPr. 1 and the bypass electromagnetic contactor 40 is activated. Then, the operation control unit 64 stops the thyristor circuit of the voltage / current control circuit 61 two seconds after the bypass electromagnetic contactor 40 is turned on. Thus, the induction motor M is in a stable steady operation state.

  When stopping, the operation control unit 64 operates the thyristor circuit of the voltage / current control circuit 61 when receiving the stop instruction, and shuts off the bypass electromagnetic contactor 40 two seconds after receiving the stop instruction. By causing the output to overlap between the starter 60 and the bypass electromagnetic contactor 40 every 2 seconds, arcs that occur when the bypass electromagnetic contactor 40 is turned on and off are prevented.

When the operation control unit 64 and the bypass electromagnetic contactor 40 are shut off, the output voltage is reduced from the output during steady operation to the target voltage EPr. Drop to 3 and output.
Then, gradually, the time TPr. 2 to obtain a stop voltage EPr. Reduce the output voltage to 4. The output voltage is the stop voltage EPr. At 4, the operation control unit 64 stops the output of the thyristor circuit of the voltage / current control circuit 61. In this manner, the starter 60 can perform an ideal operation of the induction motor M by operating the induction motor M along the operation pattern 3.

  In this way, a plurality of completely different operation patterns are stored in the memory unit 63 for each application, and the operation control unit 64 performs induction motors from start to stop along one operation pattern selected from the plurality of operation patterns. By adjusting the output to M, it is not necessary to prepare the starter 60 for each application. Therefore, the starter 60 can quickly respond to a request from a customer.

  Further, since the operation control unit 64 adjusts the output to the induction motor M based on the operation pattern selected by the input unit 62c while looking at the display panel 62a of the operation panel 62, it is selected or installed at the time of factory shipment. It can be selected on site. Therefore, the operation pattern can be easily selected.

  Further, since the operation control unit 64 adjusts the output to the induction motor M based on the setting of the output control parameter of the operation pattern input by the input unit 62c, fine adjustment is performed while moving the power load at the installation site. be able to. Therefore, since finer adjustment can be performed, the operation of the ideal induction motor M can be further performed.

In this embodiment, as an explanation of the setting of each output control parameter of the operation pattern, output voltage setting and time setting are taken as an example. For example, fire extinguishing when the power source is an emergency generator or UPS is used. In an operation pattern for a power load such as a pump and a smoke blower, an output voltage setting for adjusting an output current can be input.
In addition to the output voltage setting and time setting, the operation pattern output control parameter can be set to set the slope to increase or decrease the output, or to set the absolute value instead of the output ratio. May be. Further, the present invention can cope with the rotational power load by changing the voltage / current control circuit to the rotational power load, in addition to the three-phase alternating current, and the single-phase alternating current.

  The present invention is suitable for a rotation control device that performs control from the start to the stop of a rotational power load. In particular, the present invention is most suitable for a starter that can stably and safely control the starting of a rotational power load.

DESCRIPTION OF SYMBOLS 10 Motor control system 20 Earth leakage breaker 30 Main electromagnetic contactor 40 Bypass electromagnetic contactor 60 Starter 61 Voltage current control circuit 62 Operation panel 62 a Display panel 62 b Lamp 62 c Input part 63 Memory part 64 Operation control part 70 Output terminal Table E Substation equipment M Induction motor

Claims (3)

Storage means for storing a plurality of operation patterns of output to the rotational power load, and control for adjusting the output to the rotational power load from start to stop along one operation pattern selected from the plurality of operation patterns And a rotation control device. The rotation control device according to claim 1, wherein the control means adjusts an output to the rotational power load based on an operation pattern selected by an input from an operation panel. The rotation control device according to claim 1, wherein the control means adjusts an output to the rotational power load based on a setting of an output control parameter of an operation pattern input from an operation panel.