JPH0421063Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording device suitable for constantly monitoring and recording seismic motion, and particularly to a recording device suitable for use in constantly monitoring and recording seismic motion. The present invention relates to a recording device that can prevent malfunctions.

[Prior Art] Generally, nuclear power plants, railway facilities, and the like are equipped with devices that constantly monitor and record seismic motion to ensure safety in the event of an earthquake.

Such a recording apparatus is designed to prevent the recording apparatus from malfunctioning even if disturbance (noise) enters through the power supply.

An example of a conventional recording apparatus of this type is shown in FIG. 2, for example. This recording device records information based on the output from the seismograph 3 as a detector, and records information based on the output from the seismograph 3 using an activation signal caused by the seismograph output.
It is configured to start after entering Vt and
For this purpose, a starting signal supply line TL from the seismometer 3 to the recording device 6 is provided.

This TL is equipped with a filter circuit 4 that removes noise contained in the seismometer 3 as a detector, and also outputs (voltage) Vd from this filter circuit 4 and a reference voltage Vo from a reference voltage source 5A. A comparison circuit 5 is provided which outputs an activation signal Vt to the recording device 6 when Vd≧Vo.

Further, a power supply 1 for the recording device 6 is provided, and the output from the power supply 1 is supplied to the recording device 6 and the comparison circuit 5 through a filter circuit 2 consisting of a ceramic gas tube arrester, a solid state arrester, etc. It's summery.

As a result, disturbances (noise) that have entered through the power supply 1 are removed by the filter circuit 2 and are prevented from entering the recording device 6 or comparison circuit 5 side.

[Problems that the invention aims to solve] However, although such conventional recording devices remove stationary noise to some extent, they do not remove most of the surge noise that accompanies lightning, the opening and closing of large current relays, etc. First, this may cause the recording device to malfunction.

The present invention aims to solve these problems. It prevents the recording device from malfunctioning due to various disturbances that enter through the power supply, and also prevents disturbances from entering after the recording device starts recording. An object of the present invention is to provide a malfunction-preventing recording device that can record information from a detector without hesitation as long as the detector is in operation.

[Means for solving the problem] Therefore, the malfunction prevention type recording device of the present invention has the following features:
A recording device that starts recording information based on the output of a detector after inputting a start signal caused by the output of the detector, comprising a power source for the recording device,
In order to prevent the recording device from malfunctioning due to disturbances that enter through the power source, a comparison means is provided that receives a signal from the power source and outputs a control signal to that effect when the signal is equal to or higher than a predetermined value. In addition, a switch means is provided which cuts off the starting signal supply line from the detector to the recording device when the control signal is input, and the switch means shuts off the starting signal supply line from the detector to the recording device while information is being recorded based on the output of the detector. In order to maintain the switch means in a closed state even when the disturbance enters, an AND circuit is provided in the circuit from the comparison means to the switch means, and a start signal is supplied to the AND circuit through the start signal supply line. A not circuit is provided which can invert and input the control signal from the comparison means to the AND circuit, while the start signal is flowing through the start signal supply line, the AND circuit or the switch is connected. It is characterized by being constructed so as not to open the means.

[Function] In the above-mentioned malfunction prevention type recording device of the present invention, when a disturbance enters the detector while the detector is in an inactive state, a control signal is output from the comparison means to the switch means, and the switch means is opened, so that the activation signal is not activated. The supply line is shut off and malfunction of the recording device is prevented.

However, while the detector is operating and the information from the detector is being recorded by the recording device, the switch means will not be opened even if a disturbance occurs and the recording operation will continue without interruption.

[Example] Hereinafter, a malfunction-preventing recording device according to an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration thereof, and in FIG. 1,
The same reference numerals as in FIG. 2 indicate substantially similar parts.

As shown in FIG. 1, this recording device also has a starting signal supply line TL extending from the seismometer 3 as a detector to the recording device 6, and this starting signal supply line TL includes a filter circuit 4 and a comparison circuit. 5 are provided in order from the seismometer 3 side as a detector.

Further, a power source 1 for the recording device 6 is provided,
A filter circuit 2 is provided on the output side of this power supply 1.

This configuration is the same as the conventional one, but
The following points differ from the conventional one. That is, a signal Vs is received from the power supply 1 before entering the filter circuit 2, and this signal Vs is a reference voltage Voo from the reference voltage source 7A (this voltage Voo is a value lower than the value that would cause the recording device 6, alarm device, etc. to malfunction). ), that is, Vs
A comparison circuit (comparison means) 7 is provided which outputs a control signal to that effect (a high level signal, hereinafter referred to as an H signal) when ≧Voo.

Further, recording device inoperation detection means M is provided which outputs a control signal to that effect when the activation signal Vt is not outputted. Knot circuit (inverter) 11 that inverts the starting signal Vt
It is equipped with

The outputs of the comparison circuit (comparison means) 7 and the NOT circuit 11 are input to an AND circuit 10.

Furthermore, the output end of the AND circuit 10 is connected to the excitation coil of an electromagnetic relay switch 8 interposed on the output side of the comparator circuit 5 in the starting signal supply line TL.

The relay switch 8 is a normally chrome-plated type switch that opens when energized and closes when de-energized.

Therefore, when the H signal is input from the comparison circuit (comparison means) 7 and the NOT circuit 11, the AND circuit 10 also outputs the H signal, so the relay switch 8 is opened, but otherwise, the AND circuit 10 outputs an H signal. Since only a low level signal is output, the relay switch 8 is closed.

In this way, the relay switch 8 and the AND circuit 10 connect the comparison circuit (comparison means) 7 and the NOT circuit 11.
A switch means SM is configured to cut off the starting signal supply line TL when a signal from the starting signal is input.

With the above configuration, if a disturbance such as a lightning surge enters through the power supply 1 even when no earthquake has occurred, the comparator circuit (comparison means) 7 will
The signal is output, but since the start signal Vt is not output at this time, the H signal is also output from the note circuit 11.
A signal is output. As a result, an H signal is output from the AND circuit 10 to the relay switch 8, so
Relay switch 8 opens and the start signal supply line
Block TL.

As a result, even if a disturbance accidentally enters the recording device 6 side, the activation signal is not issued to the recording device 6, so that the recording device 6 will not malfunction.

On the other hand, when an earthquake occurs, the starting signal Vt is outputted through the comparator circuit 5, so the output from the knot circuit 11 becomes low level.

As a result, the signal from the AND circuit 10 to the relay switch 8 also becomes low level, and the relay switch 8 maintains the activation signal supply line TL in a conductive state while remaining closed.

Therefore, when an earthquake occurs, the recording device 6 starts operating with the activation signal Vt, and the earthquake information from the seismograph 3 is reliably recorded.

In addition, if a surge disturbance enters after an earthquake occurs, the activation signal Vt has already been output.
Since the output from the knot circuit 11 is at a low level, the relay switch 8 will not open, and the earthquake information recording operation will not be interrupted. That is, the recording device 6 that has already been started
Earthquake records are recorded continuously.

Of course, it goes without saying that the filter circuit 2 removes stationary noise.

As mentioned above, the malfunction prevention type recording device of this embodiment can reliably prevent the recording device 6 from malfunctioning even if various disturbances invade, so that the recorder tape is not wasted. Furthermore, when an earthquake occurs, the recording device 6 is reliably activated and information from the seismograph 3 can be recorded. Once the recording device 6 starts operating, the recording of earthquake information will continue as long as the activation signal Vt from the seismograph 3 is not interrupted, and even if a disturbance occurs, the recording operation of earthquake information will be interrupted. It is done without fail.

Therefore, it can be said that this device is particularly effective when applied to an unmanned observation system.

[Effects of the invention] As detailed above, according to the malfunction prevention type recording device of the present invention, recording of information based on the output of the detector is started after inputting a start signal caused by the output of the detector. The apparatus is provided with a power source for the recording device, and is provided with comparison means for receiving a signal from the power source and outputting a control signal to that effect when the signal is equal to or higher than a predetermined value. Switch means is provided to open a starting signal supply line from the detector to the recording device when the above-mentioned detector outputs, and even if the disturbance occurs while information is being recorded based on the output of the detector, the above-mentioned In order to maintain the switch means in a closed state, an AND circuit is provided in the circuit leading from the comparison means to the switch means, and a NOT circuit is provided which can invert and input the start signal flowing through the start signal supply line to the AND circuit. is provided, so that even if the control signal is input from the comparison means to the AND circuit, the AND circuit does not open the switch means while the activation signal is flowing through the activation signal supply line. Therefore, it is possible to reliably prevent the recording device from malfunctioning due to disturbances that enter through the power source, and the operation of the recording device can be reliably started by the activation signal accompanying the activation of the detector, and furthermore, After the recording device starts recording, as long as the detector is operating, the recording device continues recording without interruption even if a disturbance occurs.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a malfunction prevention type recording device as an embodiment of the present invention.
FIG. 2 is a block diagram showing a schematic configuration of a conventional recording apparatus. 1...Power source, 2...Filter circuit, 3...Seismometer as a detector, 4...Filter circuit, 5...
Comparison circuit, 5A... Reference voltage source, 6... Recording device, 7... Comparison circuit (comparison means), 7A... Reference voltage source, 8... Relay switch, 9... Input end,
10...AND circuit, 11...NOT circuit, M...
...Recording device inoperation detection means, SM...Switch means, TL...Start signal supply line.

Claims (1)

[Scope of utility model registration request] A recording device that starts recording information based on the output of a detector after inputting a start signal caused by the output of the detector is provided with a power source for the recording device, and the recording is performed by a disturbance that enters through the power source. In order to prevent the device from malfunctioning, a comparison means is provided which receives a signal from the power supply and outputs a control signal to that effect when the signal is equal to or higher than a predetermined value. A switch means is provided for cutting off a starting signal supply line from the detector to the recording device, and while information is being recorded based on the output of the detector, even if the disturbance enters, the switch means In order to maintain the switch in a closed state, an AND circuit is provided in the circuit from the comparing means to the switching means, and a NOT circuit is provided to invert and input the starting signal flowing through the starting signal supply line to the AND circuit. and that even if the control signal is input from the comparison means to the AND circuit, the AND circuit is configured not to open the switch means while the activation signal is flowing through the activation signal supply line. This is a malfunction-preventing recording device.