JPH02214901A - Protecting device and control device for electrical equipment - Google Patents

Abstract

PURPOSE:To surely protect a subject even in case a main or auxiliary protection system has a trouble by attaining the independent operations with each other between both protection systems. CONSTITUTION:A main protection system forming a sequence controller 10 contains an input circuit 12, an arithmetic circuit 14, and an output circuit 16. Then an auxiliary protection system includes the diodes D1 - D4 and a relay R0. The abnormality of a protection subject of a compressor is detected and a contact of a switch F1, for example, is closed. Thus an input relay X1 is actuated. Then an output relay Y1 works, an output relay Y0 is turned on, and an output relay YS turned off. As a result, an electromagnetic relay S is turned off and the drive circuit of the compressor is broken. Furthermore an abnormality signal is supplied via the diode D1 and therefore the relay R0 is turned on, and an electromagnetic relay S turned off. Thus it is possible to turn off the relay S and to surely protect the compressor via either nondefective one of main and auxiliary protection systems even in case one of these two systems has a fault.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electrical equipment protection device and an electrical equipment control device, and in particular, to a device for protecting an electrical equipment and controlling an electrical equipment in a dual system. The present invention relates to an electrical equipment protection device and an electrical equipment control device suitable for

[Conventional technology]

Conventionally, when sequentially controlling equipment such as a compressor, as described in Japanese Patent Laid-Open No. 61-286901, a sequence controller is used to control the drive of the compressor, and a duplex system is used to protect the compressor. has been adopted.

[Problem to be solved by the invention]

However, in the conventional system, consideration has not been given to configuring the main protection system and the auxiliary protection system independently.
Depending on the nature of the failure in the main protection system, the auxiliary protection system may not be able to protect the object to be protected. In other words, if the compressor to be protected fails, the relay in the main protection system is activated by the signal from the failure sensor and shuts off the drive system of the compressor. Because it is used as a circuit element for the auxiliary protection system, depending on the failure of the relay used in the main protection system, the relay contacts of the auxiliary protection system may not operate, and the compressor may not be protected by the auxiliary protection system. . Note that devices employing this type of system include those described in Japanese Patent Laid-Open No. 61-58003 and Japanese Patent Laid-Open No. 55121501.

A first object of the present invention is to provide an electrical equipment protection device that can protect an object to be protected even if either the main protection system or the auxiliary protection system fails.

A second object of the present invention is to provide an electrical equipment control device that can control the drive of a controlled object even if one of the four main control systems and the auxiliary control system fails.

[Means to solve the problem]

In order to achieve the first object, the present invention provides, as a first electrical equipment protection device, an abnormality signal output means that detects an abnormality in a protected object and outputs an abnormal signal; The device has a main protection means that shuts off the drive system to be protected in response to a signal, and an auxiliary protection means that receives an abnormal signal independently from the main protection means and uses this abnormal signal to shut off the drive system to be protected. It is something.

A second electrical equipment protection device includes an abnormality signal group output means that outputs abnormality signals related to various abnormalities to be protected, and a main protection means that takes in each abnormality signal and shuts off the drive system to be protected by any of the abnormality signals. and a group of rectifying elements that independently take in each abnormal signal, rectify and output each abnormal signal, take in the output signal of each rectifier, and use the signal flowing through one of the rectifiers to control the drive system to be protected. This is a device having an auxiliary protection means for shutting off.

As a third electrical equipment protection device including a second electrical equipment protection device, the auxiliary protection means includes a relay contact that is inserted into a drive system to be protected and interrupts the drive system by an excitation signal;
An electromagnetic coil that captures the signal flowing through each rectifying element and outputs an excitation signal to the relay contact in response to the alternating current signal that accompanies the input of this signal, and a back electromotive force of the electromagnetic coil that is connected to both ends of the electromagnetic coil. This device includes a back electromotive force absorbing rectifying element that absorbs back electromotive force.

As a fourth electrical equipment protection device including the first, second, or third electrical equipment protection device, the main protection means and the auxiliary protection means are delay means that delay the cutoff of the drive system to be protected for a certain period of time after input of the abnormality signal. This is a device that has the following features.

The first electrical equipment control device includes a control signal output means for outputting a plurality of control signals to a controlled object, a main control means for taking in each control signal and controlling the driving of the controlled object by one of the control signals, and A group of rectifying elements that independently take in control signals, rectify and output each control signal, and an auxiliary control that takes in the output signal of each rectifying element and controls the drive of the control target by a signal flowing through one of the rectifying elements. This constitutes an apparatus having means.

As a second electrical equipment control device including the first electrical equipment control device, the auxiliary control means includes a relay contact that is inserted into a drive system to be controlled and opens and closes the drive system by an excitation signal;
An electromagnetic coil that captures the signal flowing through each rectifying element and outputs an excitation signal to the relay contact in response to the alternating current signal that accompanies the input of this signal, and a back electromotive force of the electromagnetic coil that is connected to both ends of the electromagnetic coil. This device includes a back electromotive force absorbing rectifying element that absorbs back electromotive force.

[Effect]

Since the main protection system, system, and auxiliary protection system are each configured independently, even if one protection system fails, the object to be protected can be protected by the other protection system. Similarly,
Since both the main control system and the auxiliary control system are configured independently, even if one control system fails, the drive of the controlled object can be controlled by the other control system.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a configuration in which the drive of a compressor to be protected is controlled by sequence control.

In FIG. 1, the sequence controller 10 is composed of a main protection system and an auxiliary protection system. A relay R1 is provided.

The input circuit 12 is an input relay X1. X2. X3.
It is equipped with X4°X,, XG, and is inserted between the power lines U,, V□. Input relay X, X2. X...
In the circuit of X, there is a switch F as an abnormality signal output means that detects an abnormality in the compressor and closes the contact.1. p...
R3°R4 is inserted. In the circuit of input relay X5, there is a start switch SW that closes the contacts in response to manual operation.
A stop switch SW2 is inserted into the circuit of the input relay X6, and the stop switch SW2 closes the contact in response to manual operation. The relay contacts of each of the input relays X to X6 are provided in the arithmetic circuit 14, respectively. The output circuit 16 includes output relays Y0°Yl, R2, R3, R4, Y, and is inserted between the power lines U, V,. And each output relay Yo-Y, contact Y 111 Y
2XI R311y4□.

Y 01. Yo2 is provided in the arithmetic circuit 14,
Contact points Y, , Y2□, Y3. ．． Y, 2 is the power line U3
．． Inserted between R3, each lamp L g I'21
Connected to L31L4. Contact Y5□ of output relay Y, along with contact R02 of relay R8 and electromagnetic relay S, are inserted between power lines U, V,. Further, the contacts of the electromagnetic relay S are inserted into the compressor driving circuit, and are configured to interrupt the compressor drive circuit when the electromagnetic relay S is turned on.

In addition, output relays Y□, Y2. There are input relays x1, ., and Y4 in the circuits, respectively. x2. x3. Contact points of x, X, , X2□, X,1. X4□ is inserted. The contact of the return switch SW4 and the contact Y0 of the output relay Y0 are inserted into the circuit of the output relay Yo.
Output relay YO is relay contact Y 1. , R21,Y,
□.

Output relays Y, , Y, , Y3 . Connected to Y4. In addition, in the circuit of output relay Y, input relay contacts X, 1. X, □TYG1-output relay contact Y. 2 has been inserted.

Diode D1. D,, D1. The anode side of D4 has input relay x1. x,, x3. x4, and each cathode is connected to the input side of relay R0. That is, each diode D~D4 is O
It is provided to constitute an R circuit. Then, R8 is inserted between the power line U□+Vx, the contact R84 and the contact of the return switch SW3 are inserted into this circuit, and the other contact R82 of the relay Ro is connected to the power line U3. V, inserted between.

Further, as shown in FIG. 2, the relay R0 includes an electromagnetic coil L1 and an electromagnetic coil L that outputs an excitation signal to the relay contacts R8, R, 2 in response to an AC signal.

It consists of a flywheel diode D5 that is connected to both ends of the electromagnetic coil L1 and absorbs the back electromotive force generated from the electromagnetic coil L1, and a backflow prevention diode D. The electromagnetic coil L1 does not respond to only this signal because the abnormal signal supplied from the diodes D□ to D4 is half-wave rectified. However, in the half cycle after the half-wave rectified signal ia flows, a back electromotive force is generated in the electromagnetic coil L, and this back electromotive force causes a current to flow in the circuit connecting the electromagnetic coil L□ and the flywheel diode D. ib flows. Therefore, even if a coil that responds to an AC signal is used as the electromagnetic coil L1, the relay contact R8 is triggered by the abnormal signal ia.

R02 can be driven. In other words, if an OR circuit is constructed by inserting diodes D, D4 into the AC signal system, the abnormal signal ia becomes a half-wave rectified signal, so a relay that responds to a DC signal cannot be used, but relay Ro can be used. If used, the signals ia and ib alternately flow through the electromagnetic coil L1, and even if an abnormal signal due to half-wave rectification causes contact R
8□, Ro2 can be driven.

In the above configuration, when the start switch SWI is turned on, the input relay X is activated and the relay contact X51 of the arithmetic circuit 14 is closed. This activates output relay Y5 and closes contacts Ys, , Y, .

At this time, the output relay Y5 is self-held by the contact Y5□, and even if the start switches S and Wl are turned off, the output relays Y, , are maintained in the on state. Then, when the contacts Y and □ are closed, the electromagnetic relay S is activated, a compressor drive circuit is formed, and the compressor starts to be driven.

On the other hand, when the compressor is in the driving state, the stop switch S
When W2 is turned on, input relay XG is activated and relay contact X6□ of arithmetic circuit 14 is opened. This turns off output relay Y, and its contacts Y, , -Y5
Contact point 2 is opened and electromagnetic relay S is turned off. This causes the compressor to stop driving.

Further, while the compressor is being driven, when an abnormality in the compressor is detected and the contact of the switch F0 is closed, the input relay X0 is activated, the relay contact X11 of the arithmetic circuit 14 is closed, and the output relay Y1 is activated. As a result, the contact Y1□ closes and the lamp L1
lights up. Further, when output relay Y11 is turned on, relay contact Y11 of arithmetic circuit 14 is closed and output relay Y0 is turned on. This causes relay contact Y. When contact 1 closes, relay contact Y. Contact point 2 opens, output relay Y is self-held, output relay Y5 is turned off, and contact point Y52 is opened. As a result, electromagnetic relay S
is turned off and the compressor drive circuit is cut off.

Furthermore, since the abnormality signal flows through the diode Di, the relay Ro is turned on, the relay contact R81 is closed, and the relay contact R62 is opened. As a result, relay R8 is self-held and electromagnetic relay S is turned off. In other words, since the electromagnetic relay S is turned off by opening contact Y5□ and contact R82, either one of the main protection system constituting the main protection means and the auxiliary protection system constituting the auxiliary protection means has failed. Also, the electromagnetic relay S can be turned off by one of the protection systems, and the compressor can be reliably protected.

In addition, since the diodes D□ to D4 are used as elements constituting the OR circuit of the auxiliary protection system, reliability can be improved more than that using relay contacts.

Furthermore, if a timer is provided as a delay means in the main protection system and the auxiliary protection system, and if the electromagnetic relay S is turned off after a certain period of time has passed after the abnormal signal is input, the electromagnetic relay S can be turned off before the operation of the sequence controller 10 is completed. The relay S can be prevented from being turned off, and the details of the failure can be reliably understood by lighting the lamps L1 to L4.

Further, in the above embodiment, the switch F□t F21 F'31 F4 is provided as the abnormal signal group output means, but the switch F is provided as the abnormal signal group output means.
1, it is also possible to omit the diode D and directly connect the input side of the manual relay X□ and the relay RD.

Furthermore, in the above embodiment, the compressor was described as a protection target, but various electronic devices such as motors were also controlled, and the sequence controller 10
If configured as a main control means and an auxiliary control means, it can also be applied to an electronic device control device.

〔Effect of the invention〕

As explained above, according to the present invention, since the main protection system and the auxiliary protection system are configured independently, the object to be protected can be reliably protected even if one of the systems fails. Similarly, since the main control system and the auxiliary control system are configured independently, even if one control system fails, the drive of the controlled object can be reliably controlled by the other control system.

Furthermore, since the electromagnetic coil also responds to a half-wave rectified abnormal signal, an AC relay can be used as an auxiliary protection means. Further, by providing delay means in the main protection system and the auxiliary protection system, it is possible to grasp the processing results accompanying the processing in the main protection system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram of relay R6. 10. Sequence controller, 12.. Input circuit, 14. Arithmetic circuit, 16.. Output circuit, SWI.. Start switch, SW2.. Stop switch, SW3. SW4...Return switch, Xx, X2. X3. X4. XS, X6-human power relay ye
t Y1+ yzt Y3. Y4. y,...Output relay R,...Relay, S...Electromagnetic relay D, D...
D3. D4...Diode, D...Flywheel diode, D6...Backflow prevention diode, Ll...Magnetic coil.

Claims (1)

[Claims] 1. An abnormality signal output means that detects an abnormality in the object to be protected and outputs an abnormal signal, a main protection means that takes in the abnormal signal and shuts off the drive system of the object to be protected using the abnormal signal, An electrical equipment protection device comprising auxiliary protection means that receives an abnormality signal independently from the protection means and uses the abnormality signal to shut off the drive system to be protected. 2. Abnormal signal group output means that outputs abnormal signals related to various abnormalities to be protected, main protection means that takes in each abnormal signal and shuts off the drive system to be protected by any of the abnormal signals, and separate abnormal signals for each abnormal signal. a group of rectifier elements that take in the signals, rectify and output each abnormal signal, and an auxiliary protection means that takes in the output signal of each rectifier and shuts off the drive system to be protected by a signal flowing through one of the rectifiers. Electrical equipment protection device with. 3. The auxiliary protection means receives a signal flowing through a relay contact that is inserted into the drive system to be protected and cuts off the drive system using an excitation signal, and each rectifying element, and responds to an alternating current signal accompanying the input of this signal. 3. The electrical equipment protection according to claim 2, further comprising: an electromagnetic coil that outputs an excitation signal to the relay contact; and a rectifying element for absorbing back electromotive force connected to both ends of the electromagnetic coil and absorbing back electromotive force of the electromagnetic coil. Device. 4. The electrical equipment protection device according to claim 1, 2 or 3, wherein each of the main protection means and the auxiliary protection means has a delay means for delaying the cutoff of the drive system to be protected for a certain period of time after input of the abnormality signal. 5. Control signal output means for outputting a plurality of control signals for the controlled object, main control means for taking in each control signal and controlling the drive of the controlled object by one of the control signals, and independently taking in each control signal. , a control device comprising a rectifying element group that rectifies and outputs each control signal, and auxiliary control means that takes in the output signal of each rectifying element and controls the drive of the control object by a signal flowing through any of the rectifying elements. 6. The auxiliary control means receives a signal flowing through a relay contact that is inserted into a drive system to be controlled and opens and closes the drive system in response to an excitation signal, and each rectifying element, and responds to an alternating current signal accompanying the input of this signal. The electrical equipment control according to claim 5, further comprising: an electromagnetic coil that outputs an excitation signal to the relay contact; and a rectifying element for absorbing back electromotive force connected to both ends of the electromagnetic coil and absorbing back electromotive force of the electromagnetic coil. Device.