JPS6219061Y2 - - Google Patents

Description

[Detailed description of the invention] In general, a remote centralized control device that controls a large number of devices from a distance has a display function that allows the control center to check the operating status of the devices at the controlled station, and a display function that allows the control center to check the operating status of the devices at the controlled station. It goes without saying that it is necessary to have a failure display function that allows the control center to check the failure status in the event of a failure, but these days such devices are also connected to external devices such as computers to provide centralized control. Monitoring is common, and therefore, it is further required to have improved packaging density and noise resistance, as well as low power consumption. However, in conventional devices, control, detection, and display are performed between the control center and the controlled station via communication relays, so the above requirements cannot be met, and furthermore, the operation of the relay contacts External devices for centralized monitoring made of semiconductors (computer etc.), it required a large number of interfaces.

Therefore, the present invention aims to solve the problems of the above-mentioned conventional devices by performing control, detection, and display using semiconductors instead of relays between the control center and the controlled station. An object of the present invention is to provide a control display detection device.

An example of implementing the present invention will be described with reference to the attached drawings. The control center and the controlled center are connected via a positive voltage power line _P1 , a negative voltage power line _N1 , and one control detection signal communication line _L1 . On the control center side, the positive voltage power line P ₁ and the zero voltage power line
A starting photocoupler PC ₁ and a stopping photocoupler PC ₂ are provided between the starting photocoupler PC ₁ and the stopping photocoupler PC ₂ , which are operated by signals from an external device such as a computer _. Between the connection part of the collector and the signal communication line _L1 , there is a photocoupler _PC3 for equipment selection operated by a signal from an external device, a diode bridge _D1 ,
D ₂ , D ₃ , and D ₄ are provided, and furthermore, a main circuit electromagnetic contactor 4 on the controlled station side is provided on the control center side.
A photocoupler PC ₄ for operation detection operates via a light-emitting diode LED or other operation display means and sends the signal to an external device via a communication line _L5 , and an overcurrent relay on the side of the controlled station. A photocoupler for fault detection that operates through a fault detection means such as a light emitting diode LED and sends the signal to an external device via a communication line _L6 .
PC ₅ is provided. In addition, between the power lines P ₁ and G ₁ , there is a toggle switch SW consisting of a start contact connected to the power line P ₁ , a stop contact connected to the power line G ₁ , and a contact connected to the signal connection line L ₁ . is provided. In the figure, G ₁ is the zero voltage power supply line,
P ₂ is a positive voltage power supply line for logic circuits, G ₂ is a zero voltage power supply line for logic circuits, IC ₁ is a drive integrated circuit for operation display means, IC ₂ is a drive integrated circuit for fault display means, and IC ₃ is a flicker generation integrated circuit. The circuit, IC ₄ is a pulse generation integrated circuit, PS is a photothyristor for driving the buzzer, BZ is a buzzer for alarm, PSB is a push button for stopping the buzzer,
R ₁ , R ₈ , R ₉ , R ₁₀ , R ₁₁ are resistors, O is an external device such as a computer, Q ₁ , Q ₂ , Q ₃ , Q ₄ , Q ₅ are operation detection parts and failures in the external device O, respectively. Detection unit, start command unit, stop command unit, selector selection command unit, L ₂ ,
L ₃ and L ₄ are connection lines. On the other hand, on the controlled station side, a constant voltage diode ZD for detecting the potential is connected to the signal communication line _L1 , and a positive voltage power supply line _P1 and a negative voltage power supply line _N1 are connected.
Operation auxiliary relay drive transistor operated via constant voltage diode ZD and resistor _R4 between
Tr and an operation auxiliary relay CX that operates via the transistor Tr and operates the main circuit electromagnetic contactor 42.
is provided. Also, constant voltage diode ZD
A resistor R ₂ and a contact 42a of the main circuit electromagnetic contactor 42 are provided in series between the terminal A on the control center side of the signal communication line L ₁ connected to the terminal A and the positive voltage power supply line P ₁ . , A contact 51a of the overcurrent relay and a resistor _R3 are connected between the terminal A and the negative voltage power supply line _N1 .
are installed in series. And between the auxiliary circuit power supply lines R and S, there is a
A contact CXa and a main circuit electromagnetic contactor 42 are provided in series.

The operation of the apparatus according to the above embodiment will now be explained. First, in the control center, the external device O
When starting equipment at _a controlled facility _using Make PC ₃ active. Then, when the activation command unit Q ₃ of the external device sends a activation signal via the communication line L ₂ , the activation photocoupler PC ₁ becomes active, and P ₁ - _{PC 1}
A circuit of -D ₁ -PC ₃ -D ₃ -L ₁ -A-ZD-R ₄ -(base of transistor Tr) -(emitter of transistor Tr) -N ₁ is constructed. At this time, the zero voltage power supply line G ₁ based on the negative voltage power supply line N ₁
When a constant voltage diode ZD with a Zener voltage VZ slightly higher than the voltage of the transistor Tr is used, the voltage VA of the terminal A seen from the emitter of the transistor Tr becomes higher than the Zener voltage VZ
A current flows through the base of. Since the transistor Tr is a grounded emitter circuit, the base current is amplified and the operation auxiliary relay CX connected to the collector side of the transistor Tr is energized, and the a contact CXa of the relay CX closes, R-CXa
-42-S circuit is configured, the main circuit electromagnetic contactor 42 is energized, and a predetermined device on the controlled side is activated. When the main circuit electromagnetic contactor 42 is energized, its a contact 42a closes, and P ₁ -R ₂ -42a-A-
A circuit of ZD−R ₄ − (base of transistor Tr) − (emitter of transistor Tr) − N ₁ is constructed. In this case, the voltage VA at terminal A is approximately equal to the resistance R _2
R4 is determined by the ratio of the transistor
Voltage VA of terminal A based on the emitter of the Tr
The ratio is such that the voltage is sufficiently higher than the Zener voltage VZ, and the resistance _R4 is set to a resistance value that allows a base current to flow that can sufficiently drive the operation auxiliary relay CX. Operation auxiliary relay CX is self-holding. In addition, since a voltage is applied in the forward direction to the operation detection photocoupler PC ₄ , P ₁ −R ₂ −42a−A−L ₁ −PC ₄ −R ₁ −
_G1 circuit is energized and photocoupler for operation detection
The PC ₄ operates, and this signal is amplified by the operation display means driving integrated circuit IC ₁ , and the light emitting diode
The LED lights up and it is possible to confirm that the specified equipment on the controlled site side is in the activated state, and this signal is sent to the external device O via the communication line L ₅ and sent to the operation detection unit Q _1. It can be detected by tilting it.

When starting equipment at the controlled station using the start/stop toggle switch SW, put the toggle switch SW into the start side contact, then P ₁ −
-L ₁ -A-ZD-R ₄ - (Base of transistor Tr) - (Emitter of transistor Tr) - The circuit of N ₁ is configured, and the voltage VA of terminal A is the same potential as the positive voltage power supply line P ₁ . Therefore, in the same way as in the previous case, the transistor Tr operates and the operation auxiliary relay CX is energized, and the main circuit electromagnetic contactor 42 is accordingly operated to start the specified equipment on the controlled station side. While the relay CX is self-held, the operation detection photocoupler PC ₄ operates and the light emitting diode LED lights up, allowing the activation status of the device to be confirmed. Detected at ₁ .

Next, a case will be described in which the external device O is used to stop equipment on the controlled site side. When the device is in the starting state, as described above, the a contact 42a of the main circuit electromagnetic contactor 42 closes, which causes the transistor Tr to operate, and the operation auxiliary relay CX to self-hold. Device selection command unit of external device O
A signal for selecting the device to be stopped is sent from _Q5 via the communication line _L4 , and the signal activates the device selection photocoupler _PC3 . Then, when a stop signal is issued from the stop command unit Q ₄ and the stop photo coupler PC ₂ is activated, P ₁ −R ₂ −
A circuit of 42a-A- _L1 - _D4 - _PC3 - _D2 - _PC2 - _G1 is constructed and current flows. At this time, the magnitude of the current is limited by the resistor _R2 so that the photocouplers _PC2 and _PC3 are not destroyed by the current. In this case, the voltage VA at terminal A is almost equal to the zero voltage power supply line.
Since the potential is the same as that of _G1 , the voltage VA at terminal A with respect to the emitter of transistor Tr becomes lower than the zener voltage VZ.Therefore, no current flows to the base of transistor Tr, and the operation of transistor Tr is reduced. stops, operation auxiliary relay CX is deenergized, and operation auxiliary relay CX is deenergized.
The a-contact CXa of CX is opened, the main circuit magnetic contactor 42 is deenergized, and the equipment is stopped, and the a-contact 42a of the main circuit magnetic contactor 42 is opened, and the relay CX is connected to the main circuit magnetic contactor 42. 42's self-hold is released. In this case, the anode and cathode of photocouplers PC ₄ and PC ₅ are at the same potential, so no current flows through them, so photocoupler PC ₄ and PC ₅ do not operate, and the light emitting diode LED turns off. It is possible to confirm that the equipment at the controlled facility has stopped by checking the
Since no operation signal is sent to the _Q1 , no operation signal is detected in the operation detection section Q1.

When using the toggle switch SW for start/stop to stop equipment at the controlled station, use the toggle switch SW.
Put the SW into the stop side contact. Then, P ₁ −R ₂ −
A circuit 42a-A- _L1 -- _G1 is formed and current flows through this circuit. In this case, the voltage at terminal A
Since VA has almost the same potential as the zero-voltage power supply line _G1 , as mentioned above, the operation of the transistor Tr, auxiliary relay CX, and main circuit electromagnetic contactor 42 stops, and the specified equipment in the controlled station stops. Stop. and,
The self-holding of the auxiliary relay CX is released, the operation of the operation detection photocoupler PC ₄ is stopped, and the light-emitting diode LED is turned off, making it possible to confirm the stopped state of the device. Further, no operation signal is detected in the operation detection section _Q1 of the external device.

Next, a case will be described in which a failure occurs in equipment at a controlled facility due to overcurrent. When the equipment at the controlled station is in the activated state, as described above, the a contact 42a of the main circuit electromagnetic contactor 42 is closed, the transistor Tr is operated, and the auxiliary relay CX is self-maintained. In this case, when an overcurrent flows through the device, the overcurrent relay mechanical contact 51a is activated, and at the same time, the a contact 42a of the electromagnetic contactor 42 is opened.
Then, the voltage VA at terminal A becomes lower than the potential of the zero-voltage power supply line G and lower than the Zener voltage VZ, so the operation of the transistor Tr stops, and accordingly, the operation of the auxiliary relay CX also stops.
Contact CXa is opened, the operation of the electromagnetic contactor 42 is stopped, and the equipment is stopped. Then, a forward voltage is applied to the fault detection photocoupler PC ₅ , and G ₁ −R ₁ −
The circuit PC ₅ -L ₁ -A-51a-R ₃ -N ₁ is configured, current flows through this circuit, the fault detection photocoupler PC ₅ operates, and this signal (fault signal) and the flicker generation integrated circuit IC The light emitting diode LED blinks due to the AND with the Fritzker signal created in _{step 3} , making it possible to confirm that the device is in a fault state due to overcurrent, and the fault signal is transmitted externally via the connection line L ₆ . The signal is sent to the device O, and a failure signal is detected in the failure detection unit _Q2 . Also,
Using the rising edge of the fault signal, a trigger pulse for the photothyristor PS is created in the pulse generation integrated circuit IC ₄ , and the alarm BZ sounds through the photothyristor PS. Stopping the alarm BZ's alarm is done by pressing the push button switch PBS.

As described above, the present invention connects the control center and the controlled station via a positive voltage power supply line, a negative voltage power supply line, and one signal communication line, and on the control center side, the positive voltage power supply line A starting photocoupler and a stopping photocoupler, which are operated by a signal from an external device, are connected between the starting photocoupler's emitter and the stopping photocoupler's collector connection between the starting photocoupler's emitter and the stopping photocoupler's collector, and an external device between the signal communication line and the zero voltage power supply line. A device selection photocoupler and a diode bridge are provided, which are operated by the signal of A photocoupler for fault detection is provided which operates via the photocoupler and an overcurrent relay on the side of the controlled station to operate the failure indicating means and send the signal to an external device, and on the side of the controlled station,
A constant voltage diode for detecting the potential is connected to the signal communication line, and a transistor for driving an operation auxiliary relay operates via a constant voltage diode and a resistor between the positive voltage power line and the negative voltage power line. Since the remote control display detection device is formed by providing an operation auxiliary relay that operates through the drive transistor and operates the main circuit electromagnetic contactor, the following effects are obtained.

That is, unlike conventional devices, semiconductors are used instead of communication relays between the control center and the controlled station to perform control, detection, and display, allowing for centralized monitoring by connecting to an external device such as a computer. In this case, compared to conventional devices, the mounting density on the board and noise resistance can be improved, and power consumption can be reduced as much as possible.
Furthermore, when using conventional communication relays, there are problems with reliability and durability due to poor operation of the relay contacts and contact life, and the large current flowing through the control and detection communication lines makes it difficult to extend the control distance. It is possible to solve the problems such as not being able to connect to an external device for centralized monitoring made of semiconductors and requiring a large amount of interface.

[Brief description of the drawings]

The drawing is a circuit diagram showing an example of implementing the present invention. P ₁ ...Power supply line for positive voltage, N ₁ ...Power supply line for negative voltage, L ₁ ...Signal connection line, G ₁ ...Power supply line for zero voltage, P ₂ ...Positive voltage power supply line for logic circuit, G ₂ ... Zero voltage power supply line for logic circuits, PC ₁ ... Photo coupler for starting, PC ₂ ... Photo coupler for stopping, PC ₃ ... Photo coupler for equipment selection, PC ₄ ... Photo coupler for operation detection, PC ₅ ... Photocoupler for failure detection, D ₁
~D ₄ ...Silicon diode, LED...Light emitting diode for operation display and failure display, _L2 ~ _L6 ...Communication line with external device, O...External device, _Q1 ...Operation detection unit, _Q2 ...Failure detection section, Q ₃ ...Start command section, Q ₄ ...Stop command section, Q ₅ ...Equipment selection command section, ZO ... Constant voltage diode, Tr ... Operation auxiliary relay drive transistor, CX... ...Operation auxiliary relay, CXa...Operation auxiliary relay a contact, 42...
Main circuit electromagnetic contactor, 42a... Main circuit electromagnetic contactor a contact, 51a... Overcurrent relay a contact, R ₁ ~
R ₁₁ ...Resistance.

Claims (1)

[Scope of utility model registration request] The control center and the controlled station are connected via positive voltage power supply line and negative voltage power supply line and one signal communication line, and on the control center side, between the positive voltage power supply line and the zero voltage power supply line. A photocoupler for starting and a photocoupler for stopping that are operated by signals from an external device are connected between the emitter of the photocoupler for starting and the collector of the photocoupler for stopping and the signal connection line, and a photocoupler for equipment selection that is operated by signals from an external device. and a diode bridge, and a photocoupler for operation detection that operates via the main circuit electromagnetic contactor on the side of the controlled station to operate the operation display means and send the signal to an external device, and an overcurrent on the side of the controlled station. A photocoupler for failure detection is provided that operates via a relay to operate the failure display means and send the signal to an external device, and on the controlled station side, a constant voltage diode is connected to the signal communication line to detect the potential. In addition, an operation auxiliary relay drive transistor is provided between the positive voltage power supply line and the negative voltage power supply line, which operates via a constant voltage diode and a resistor, and a main circuit electromagnetic contact which operates via the drive transistor. A remote control display detection device using a semiconductor, characterized in that it is provided with an operation auxiliary relay for operating the device.