JP2663613B2 - Auxiliary controller with output polarity selection function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an inverter, a primary voltage control type variable speed motor (hereinafter, referred to as PS motor), and an eddy current joint type variable speed motor (hereinafter, KS). The present invention relates to an auxiliary controller for outputting a speed command or the like to a control device such as an AC servomotor or a DC servomotor.

[Conventional technology]

Conventionally, as an auxiliary controller that outputs a speed command or the like to a control device of a variable speed motor, there are few types of widely used variable speed motors. It was common to have the same polarity and thus have a single polarity output.

However, recently, various types of variable speed motors have been developed and their use has increased, and the polarities of input signals to control devices of various variable speed motors have also been different. For example, +
It is a polarity input signal, a negative polarity input signal to the PS motor control device, and a positive and negative polarity input signal to the servo motor control device.

[Problems to be solved by the invention]

As described above, when various variable speed motors are used, it is necessary for the auxiliary controller applied to these control devices to change the output polarity according to each control target as described above.

Accordingly, such an auxiliary controller is provided with a switching means for changing the output polarity in accordance with the control device of each control object when using one auxiliary controller to control various types of variable speed motors and the like. It is necessary. However, in this case, although it is easy to provide the switching means, it is required to be able to confirm whether or not the desired output polarity is actually obtained. Not only can not give an appropriate command to the control device, but also there is a danger that an erroneous command is given to the control device to cause a malfunction of the controlled object.

Therefore, an object of the present invention is to add a function of detecting the output polarity of a signal output from the auxiliary controller, and when the output signal has a polarity other than the desired polarity, set the output signal to 0 to cause malfunction. It is an object of the present invention to provide an auxiliary controller having an output polarity selection function which can prevent the occurrence of an output polarity and can always select an appropriate output polarity.

[Means for solving the problem]

An auxiliary controller having an output polarity selection function according to the present invention is an auxiliary controller that outputs a signal such as a speed command to a control target including a control device such as a variable speed motor. An open collector output first comparator and a second comparator having an input terminal are provided. A negative polarity input terminal of the first comparator and a positive polarity input terminal of the second comparator are respectively controlled. The circuit is connected so as to input an output signal "in" for instructing the above, and a positive polarity voltage larger than the voltage value of the output signal "in" is applied to a positive input terminal of the first comparator via a resistor. And a polarity selection switch connected to the second comparator. A negative polarity voltage greater than the voltage value of the output signal in is applied to the negative polarity input terminal of the second comparator via a resistor, and the polarity selection switch is selected. A switch is connected, and a positive polarity voltage larger than the voltage value of the output signal in is applied to the output terminals of the first comparator and the second comparator via a common resistor, and the inverter is connected to the output terminal via an inverter. An analog switch that outputs an output signal out having a predetermined polarity and an analog switch that becomes a zero output signal out are connected to the respective analog switches, and the output signal in is input to the comparator to input a command to a control target. When one of the comparators having an input terminal having the same polarity as the polarity is selected by the polarity selection switch, the output signal out having the same polarity is output.

[Action]

According to the auxiliary controller having the output polarity selection function according to the present invention, when the output signal of the desired polarity is obtained by operating the switch for selecting the polarity of the output signal, the output signal of the auxiliary controller has the same polarity. If this is the same, a desired signal can be output. However, when the polarity is different from the selected polarity, the output of the auxiliary controller becomes 0, and the output of an erroneous command to a required control device can be reliably prevented.

〔Example〕

Next, an embodiment of the auxiliary controller according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a main part circuit diagram of an auxiliary controller for selectively limiting the polarity of an output signal, which is a main part of the present invention. That is, in FIG. 1, reference numerals 10 and 12 denote open collector output comparators.
Is configured to detect the polarity of an output signal in for instructing a control target. Reference numerals 14 and 16 denote switches SW1 and SW2 for selectively setting the polarity of the output signal. Further, reference numerals 18, 20, and 22 denote resistors, 24 denotes an inverter, and 26 and 28 denote negative logic analog switches ASW1 and ASW2, respectively.

The negative logic analog switches ASW1 and ASW2 are turned off when the control input signal is at a high level H, and turned on when the control input signal is at a low level L.

The voltage + E pulling up the resistor 18 is selected to be larger than the positive polarity voltage value of the output signal in to the auxiliary controller. Further, the voltage -E pulling up the resistor 20 is equal to the-of the output signal in to the auxiliary controller.
Select so as to be more negative than the polarity voltage value.

In this manner, the embodiment circuit shown in FIG. 1 constitutes an output polarity selection and limitation circuit of the auxiliary controller.

Next, the operation of the circuit of this embodiment having the above configuration will be described.

<When the switch SW1 is ON and the switch SW2 is OFF> When the polarity of the output signal in to the auxiliary controller is +, the outputs of the open collector output comparators 10 and 12 become low level L, and the output of the inverter 24 becomes The high level is set to H, and the analog switch ASW1 is turned off and the analog switch ASW2 is turned on.
As a result, the output signal out as the auxiliary controller becomes 0 volt.

When the polarity of the output signal in to the auxiliary controller is-, the outputs of the open collector output comparators 10 and 12 become high level H, and the output of the inverter 24 becomes low level L.
Then, the analog switch ASW1 is turned on and the analog switch ASW2 is turned off. As a result, the output signal out as the auxiliary controller is output as a negative polarity output signal.

Therefore, when the switches SW1 and SW2 are selected as described above, the output signal out as the auxiliary controller is limited to the negative polarity.

<Case where the switch SW1 is OFF and the switch SW2 is ON> In this case, as is clear from the operation of the circuit shown in FIG. 1, the polarity of the output signal in to the auxiliary controller is + and- At this time, the opposite situation occurs, and as a result, the output signal out as the auxiliary controller is limited to the positive polarity.

<Case where the switch SW1 is OFF and the switch SW2 is OFF> In this case, as is clear from the above description, the output signal out as the auxiliary controller is limited to the positive and negative polarities. .

[Effects of the Invention] As is clear from the above-described embodiments, according to the present invention,
By performing ON / OFF switching operation of the switches SW1 and SW2, the polarity of the output signal out can be limited.For example, the polarity of the output signal in to the auxiliary controller is selected by the switches SW1 and SW2. If not, the output signal out is 0. Therefore, in this case, since the output signal out other than the selected desired polarity is not output, a malfunction due to a wrong command can be reliably prevented. In this case, the output signal to the auxiliary controller
If the polarity of in is changed, the output signal ou
You can get t.

As described above, the auxiliary controller having the output polarity selection function according to the present invention is a device that performs speed control of various types of variable speed motors such as an inverter, a PS motor, a KS motor, an AC servo motor, and a DC servo motor. In addition, handling can be simplified and safe and reliable selection of output polarity can be achieved.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it is needless to say that various design changes can be made without departing from the spirit of the present invention. .

[Brief description of the drawings]

FIG. 1 is a main part circuit diagram showing an embodiment of an auxiliary controller having an output polarity selection function according to the present invention. 10,12 Comparator 14,16 Switch SW1, SW2 18,20,22 Resistor 24 Inverter 26,28 Analog switch ASW1, ASW2

Claims (1)

(57) [Claims] An auxiliary controller for outputting a signal such as a speed command to a control object including a control device such as a variable speed motor, comprising: a first open collector output having a positive polarity input terminal and a negative polarity input terminal; And a second comparator. An output signal in for instructing a control target is input to a negative polarity input terminal of the first comparator and a positive polarity input terminal of the second comparator. A circuit having a positive polarity input terminal greater than the voltage value of the output signal in and a polarity selection switch connected to a positive polarity input terminal of the first comparator via a resistor; To the negative input terminal of the comparator, a negative polarity voltage larger than the voltage value of the output signal in is applied via a resistor, and a polarity selection switch is connected. To the output terminal of the second comparator and the output terminal of the second comparator through a common resistor, to apply a voltage of + polarity larger than the voltage value of the output signal in, and to output an output signal out of a predetermined polarity through an inverter. The comparator has an input terminal having the same polarity as the polarity of the output signal in for each of the comparators connected to the analog switch for obtaining the output signal 0 and the analog switch for obtaining the 0 output signal out. An auxiliary controller having an output polarity selection function, wherein when the one of the comparators is selected by the polarity selection switch, the output signal out having the same polarity is output.