JPH06243381A - Alarm output diagnostic device - Google Patents

Abstract

PURPOSE:To prevent an alarm from being delayed or stopped from being outputted owing to a fault of an alarm device by displaying the normalcy of the output of a speaker by the holding operation of the hold relay of a display circuit. CONSTITUTION:An ON/OFF signal output circuit 5 outputs a signal which turns ON at a specific level where the output of the speaker 2 is normal and turns OFF at other levels. Further, a switch 6 is alternately switched according to the signal which turns ON and OFF; when the switch is ON, the electric power from a DC power source 7 is charged in a capacitor 8 and when OFF, the electric charges of the capacitor 8 are supplied to a capacitor 9 and the hold relay 10. Thus, the capacitor 8 is charged and discharged repeatedly at certain timing to hold the operation of the hold relay 10. Consequently, a contact 11 is held ON to connect the display circuit 13 to a power source 12, thereby making a display showing that the alarm device including the speaker 2 and a speech signal output circuit 1 is in normal operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm output diagnosis device for diagnosing whether an alarm signal input from the outside is normally output from a speaker.

[0002]

2. Description of the Related Art In factories, construction sites, public broadcasting systems, and the like, alarm devices have been widely used to notify workers or residents that a danger is approaching by an alarm sound. Since the purpose of the alarm device is to notify that the danger is approaching, it cannot be left unattended due to a failure, and maintenance and management are extremely important. Therefore, it is necessary to periodically check whether or not the alarm is output normally. Until now, measures such as broadcasting a test broadcast and asking a monitor person near the speaker to confirm it. I picked up.

[0003]

However, it is difficult to secure personnel such as a monitor person today, and maintenance and management are only performed regularly, and when unmanned monitoring is performed in a distant place, There were problems that it took time for workers and residents on site to receive alarm notifications, and that they were at risk due to the failure of speakers and buzzers.

The present invention has been made in order to solve the above-mentioned conventional problems, and it is possible to automatically test the status of alarm output so that an alarm in case of emergency can be surely obtained from a speaker. It is an object of the present invention to provide an alarm output diagnostic device capable of avoiding the danger of alarm delay or stop.

[0005]

An alarm output diagnostic apparatus according to the present invention is a test signal detector for detecting a test signal output from a speaker, and a level at which the speaker output is normal based on the test signal. Turned on,
An on / off signal output circuit that outputs a signal that is otherwise turned off and a holding relay that is held only when the on / off signal output circuit periodically outputs an on / off signal are provided. The circuit makes it possible to display that the output of the speaker is normal by the holding operation of the holding relay.

[0006]

The alarm output diagnostic device according to the present invention inputs a test signal, which is a periodic sound generation signal, to a circuit for driving a speaker in the alarm device, detects the test signal by a test signal detector, and outputs the detection result. According to the ON / OFF signal output circuit to output the ON / OFF signal,
When this ON / OFF is repeated, the holding relay is operated to hold and the alarm contact is interlocked, and the display circuit indicates that the output of the speaker is normal.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes an audio signal output circuit which constitutes an alarm device, processes an alarm signal and a test signal input from the outside, and outputs them to a speaker 2 as an audio signal. Here, the test signal is a signal of a short time or frequency that cannot be heard by the human ear except when the alarm signal is output.

Further, 3 is a test signal detector as a sound sensor provided near the installation side of the speaker 2, 4 is an amplifier for amplifying the test signal detected by this test signal detector, and 5 is an amplifier from the amplifier 4. Based on the test signal
When the output of the above speaker turns on at a normal level,
It is an on / off signal output circuit that outputs a signal that is otherwise turned off.

Further, 6 is a switch which is switched by an ON / OFF signal output from the ON / OFF signal output circuit 5. For example, when an ON signal is received, the DC power supply 7 is switched so as to charge the capacitor 8, and the switch is turned OFF. When the signal is received, the charge of the capacitor 8 is supplied to the capacitor 9 and the holding relay 10 connected in parallel with the capacitor 9, and the holding relay 10 is switched to be held. Further, 11 is a contact for interlock of the holding relay 10, and a power source 12 and a display circuit 13 for displaying that the output of the speaker is normal are connected in series to this contact 11.

Next, the operation will be described. First, when it is necessary to issue an alarm, an alarm signal is input to the audio signal output circuit 1 from an external circuit. The audio signal output circuit 1 receives the alarm signal and causes the speaker 2 to output the alarm. As a result, the alarm from the speaker 2 can alert the residents in the vicinity of the danger.

On the other hand, except when an alarm is generated, the external circuit inputs to the audio signal output circuit 1 a test signal in a short time or in a frequency band that does not work such that the human ear cannot hear or cannot hear. The test signal is subjected to appropriate processing in the audio signal output circuit 1 and input to the speaker 2, and is output from the speaker 2 to the surroundings as an audio signal that does not affect the human ear. Further, the test signal as the audio signal is input to the test signal detector, the test signal detected here is amplified by the amplifier 4, and then input to the on / off signal output circuit to output the on / off signal. The signal output circuit 5 outputs a signal which is turned on at a predetermined level where the output of the speaker 2 is normal and is turned off otherwise. Further, the switch 6 is alternately switched according to these signals to be turned on or off. When the switch 6 is turned on, the capacitor 8 is charged with electric power from the DC power source 7, and when the switch 8 is turned off, the charge of the capacitor 8 is changed to the capacitor 9 and the holding relay 10. To the holding relay 1 by repeatedly charging and discharging the capacitor 8 at a constant timing.
The 0 motion is retained.

As a result, the contact 11 is maintained in the ON state, the display circuit 13 is connected to the power source 12, and the speaker 2
And that the alarm device including the audio signal output circuit 1 can operate normally.

On the other hand, when the ON / OFF signal output circuit 5 does not output the repeated ON / OFF signal although the test signal is input to the audio signal output circuit 1,
Since the charging / discharging of the capacitor 8 is not repeated, the operation of the holding relay 10 is not held and the contact 11 is turned off. As a result, the display circuit 13 does not operate, and it is not displayed that the alarm device is normal. That is, an abnormal display will be performed. Therefore, in this case, repair, repair or replacement of the alarm device is urged, and it becomes possible to prepare for an emergency alarm by promptly taking necessary measures.

[0014]

As described above, according to the present invention, the test signal detector for detecting the test signal output from the speaker, and the output of the speaker is turned on at a normal level based on the test signal. And an on / off signal output circuit that outputs a signal that is otherwise turned off, and a holding relay that is held only when the on / off signal output circuit periodically outputs an on / off signal. Since the display circuit indicates that the output of the speaker is normal by the holding operation of the holding relay, an emergency alarm can be reliably obtained from the speaker and the status of the alarm output is automatically displayed. The effect of being able to test, and thus preventing alarm delays and alarm output stoppages due to alarm device failure, and ensuring real benefits such as emergency evacuation A.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an alarm output diagnosis device according to an embodiment of the present invention.

[Explanation of symbols]

 1 audio signal output circuit 2 speaker 3 test signal detector 5 on / off signal output circuit 10 holding relay 13 display circuit

Claims (1)

[Claims] 1. An audio signal output circuit for outputting to a speaker an alarm signal and a test signal in a short time or in a frequency band which does not affect the human ear except when the alarm signal is output, and the audio signal output circuit. Based on the test signal detector for detecting the test signal and the test signal detected by the test signal detector, the speaker outputs a signal that is turned on at a normal level and is turned off otherwise. ON / OFF signal output circuit, holding relay that is held only when the ON / OFF signal output circuit periodically outputs ON / OFF signals, and the output of the speaker is normal due to the holding operation of the holding relay And an alarm output diagnostic device having a display circuit capable of displaying that