JPS631400A - Controller for contactless contactor - Google Patents

Abstract

PURPOSE:To simplify wirings by applying an open/close control signal through an optical fiber to a contactless contactor to use wirings between the contactors only by the optical fiber. CONSTITUTION:A sequence controller 1 outputs an open/close control signal to contactless contactors 4a-4n. These control signal is serially converted by a master station 2, and further converted to an optical signal. The signal is applied through an optical fiber 3 to the contactor 4a. The second and the following control signals are transmitted through the fiber 3a to the next contactor 4b as they are. The operation state signals of all the contactors are output from the contactor 4n to the fiber 3n.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a control device for a conductor, and more particularly to a control device for a non-contact conductor using a semiconductor element. (Conventional technology) A wide variety of motors are used in large quantities in processing machines, automated lines, etc. In accordance with the flow of system processing, the sequence controller outputs open/close control signals for the switches connected between each motor and the power supply, controlling the operation and stopping of each motor. In such cases, electromagnetic contactors were used as switches. (Problems to be Solved by the Invention) Electromagnetic contactors have drawbacks such as requiring maintenance and being restricted in the environment in which they can be used, so contactless contactors are being promoted. As shown in Fig. 2, the non-contact conductor is a thyristor anti-parallel connected circuit for two phases, and a thyristor for three phases, housed in one package. R. S. T is connected to the power supply, and U, ①, and W are connected to the motor. Conduction/cutoff of the thyristor is controlled by control signals given to G1, G2, and G3. By making the conductor contactless, its control circuit is also electronic, making it possible to provide protection functions that were previously provided by thermal relays. but. If you try to electrically wire the power supply and open/close control signals of the non-contact conductor control circuit from the sequence controller, you will have to wire many devices over long distances, which not only requires time and expense, but also reduces the reliability of the device due to noise. invite

An object of the present invention is to simplify the wiring between a non-contact conductor and a sequence controller and make it noiseless.

[Structure of the invention]

(Means for Solving the Problems) The present invention was made by focusing on the fact that a non-contact conductor is connected between a motor and a power source.
A large number of non-contact conductors are connected in a loop with optical fibers, and a master station that controls optical signals is placed below the sequence controller. A control power supply circuit for obtaining control power is placed on the power supply side of the non-contact conductor.

(Operation) The opening/closing control signal output from the sequence controller is converted into an optical signal at the master station, and is given to the non-contact conductor via the optical fiber. The non-contact conductor is supplied with power for the control circuit from the input main power supply, converts the opening/closing control signal from the sequence controller into an electrical signal, and controls the opening/closing of the switch based on the signal.

(Example) The configuration of the present invention will be explained based on FIG.

1 is a sequence controller that centrally controls the entire system; 2 is a master station that converts the opening/closing control signal given from the sequence controller 1 into a serial optical signal and puts it on an optical fiber; 3, 3a to 3n are optical fibers; 48 to 4
n is a non-contact conductor, 58~5n is a power supply, 6a~6
n is an induction motor, 7 is a conductor main circuit, 8 is a control power supply circuit, and 9 is a control circuit.

Although the details of 4b to 4n are omitted, they all have the same configuration as 4a.

The sequence controller 1 has each non-contact conductor 48~
Outputs the opening/closing control signal to 4n. These opening/closing control signals are serially converted by the master station 2 and further converted into optical signals. The opening/closing control signal is given to the non-contact conductor 4a via the optical fiber 3. Non-contact conductor 4a
In this case, control power is supplied from the control power supply circuit 8 connected to the input side of the conductor main circuit 7, and the control circuit 9 operates. The control circuit 9 converts the opening/closing control signal serially given from the master station 2 from an optical signal to an electrical signal, interprets the first opening/closing control signal as the opening/closing control signal to the own station, takes it in, and controls the operation of the own station instead. Put the status signal on the optical fiber. The second and subsequent opening/closing control signals are transmitted as they are to the next non-contact conductor 4b via the optical fiber 3a.

The non-contact conductor 4b takes in only the second opening/closing control signal as an opening/closing control signal to its own station, and instead carries the operating state signal of its own station onto the optical fiber. In this way, the opening/closing control signal and the operating state signal are exchanged one after another, and the operating state signals of all the contactless conductors are outputted to the optical fiber 30 from the non-contact conductor 4n. Therefore, in the signal received by the master station 2 via the optical fiber 3n, the operation status signals of the non-contact conductors 4a to 40 are arranged in order. Therefore, by converting this signal into parallel data and displaying it, the operating states of the non-contact conductors 48 to 4n can be centrally displayed at the master station. Each of the non-contact conductors 48 to 4n controls the opening and closing of the conductor main circuit 7 in accordance with the opening/closing control signal output from the control circuit 9, thereby controlling the operation/stop of the induction motors 6a to 6n.

〔Effect of the invention〕

As explained above, according to the present invention, the wiring between each non-contact conductor becomes only an optical fiber, and the wiring can be simplified. If the control power is supplied from the sequence controller, even if the optical signal itself is noiseless, noise may enter from the control power during optical/electrical conversion using a non-contact conductor. According to the present invention, since a control power source is obtained for each non-contact conductor, this fear is eliminated.

[Brief Description of the Drawings] Fig. 1 is a configuration diagram of an embodiment of the present invention, and Fig. 2 is a configuration diagram of a conductor main circuit section of a non-contact conductor. 1...Sequence controller, 2...Parent Bureau, 3
, 3a-30... Optical fiber, 4, 48-40... Non-contact contactor, 5a-5n.
...Power supply, 68~6n...Induction motor. 7
...Conductor main circuit, 8...Control power supply circuit,
9...Control circuit. Figure 1 RST Figure 2

Claims (1)

[Claims] In a control device for a non-contact conductor that is mechanically connected between a power source and a load and whose opening/closing is controlled based on a switching control signal to control the electrical connection between the load and the power source, the switching control signal is an optical signal. A non-contact conductor control device characterized in that the control circuit power source is obtained from a mechanically connected power source.