JP2886018B2 - Alarm output diagnostic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm output diagnostic device for diagnosing whether or not an externally input alarm signal is normally output from a speaker.

[0002]

2. Description of the Related Art In factories, construction sites, public broadcasting systems, etc., an alarm device has been widely used for notifying or forecasting that a danger is approaching nearby by an alarm sound to workers and residents. Since the purpose of such an alarm device is to notify that danger is imminent, it is not permitted to leave the device due to a failure, and maintenance and management are extremely important. Therefore, it is necessary to periodically check whether or not an alarm is output normally. Until now, a test broadcast has been played and measures such as having a monitor person near the speaker installed confirm the broadcast. Has been taken.

[0003]

However, today, it is difficult to secure personnel such as monitor personnel, and maintenance and management are only performed periodically. There were problems that it took time for workers and residents on the site to be notified of the alarm, and there was a danger that no notification could be received due to a malfunction of the speaker or buzzer.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and can automatically test the status of alarm output so that an emergency alarm can be reliably obtained from a speaker. Accordingly, it is an object of the present invention to provide an alarm output diagnostic device capable of avoiding danger caused by delay or stop of an alarm beforehand.

[0005]

An alarm output diagnostic apparatus according to the present invention includes a test signal detector for detecting a periodic test signal output from a speaker, and a test signal detector based on the test signal. ON / OFF for outputting a signal that turns on when the output of the speaker is normal and turns off otherwise
And off signal output circuit, the on / off signal output circuit periodically turned on, and a holding relay, which is held only when outputs an OFF signal provided from the result output circuit of the holding relay
It is determined whether or not the output of the above speaker is normal according to the operating state.
This is to output the disconnection result .

[0006]

According to the alarm output diagnostic device of the present invention, a test signal, which is a periodic sound generation signal, is input to a circuit for driving a speaker in the alarm device, and the test signal is detected by a test signal detector. Output an on / off signal from an on / off signal output circuit according to
The operation of the holding relay when this on / off is repeated
According to the state, the result output circuit outputs a determination result as to whether or not the output of the speaker is normal.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One 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 constituting an alarm device, which processes an alarm signal and a test signal input from the outside and outputs the processed signal to the speaker 2 as an audio signal. Here, the test signal is, for example, a short-time or frequency signal that cannot be heard by a human ear except when the alarm signal is output.

Reference numeral 3 denotes a test signal detector as a sound sensor provided near the speaker 2 installation side, 4 denotes an amplifier for amplifying a test signal detected by the test signal detector, and 5 denotes an amplifier obtained from the amplifier 4. Based on the test signal
Turns on when the output of the speaker is normal,
Otherwise, it is an on / off signal output circuit that outputs a signal that is turned off.

A switch 6 is switched by an on / off signal output from an on / off signal output circuit 5. For example, when an on signal is received, the switch 6 is switched to charge a capacitor 8 by a DC power supply 7, and is turned off. When receiving the signal, the charge of the capacitor 8 is supplied to the capacitor 9 and the holding relay 10 connected in parallel to the capacitor 9, and the switching is performed so as to hold the holding relay 10. Reference numeral 11 denotes a contact for interlock of the holding relay 10, and a power supply 12 and a display circuit (result output circuit) 13 for displaying a result of determination as to whether or not the output of the speaker is normal are connected to the contact 11 in series. It is connected.

Next, the operation will be described. First, when an alarm needs to be issued, 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 an alarm. Thus, an alarm from the speaker 2 can alert a nearby inhabitant or the like of an imminent danger.

On the other hand, except when an alarm is generated, the external circuit inputs a short-time or frequency band test signal that does not act such as being inaudible or difficult to hear to the human ear to the audio signal output circuit 1. The test signal is subjected to appropriate processing by an audio signal output circuit 1 and is input to a speaker 2, which outputs the test signal to the periphery as an audio signal that does not act on human ears. The test signal as the audio signal is input to a test signal detector, and the test signal detected here is amplified by an amplifier 4 and then input to an on / off signal output circuit to be turned on / off. The signal output circuit 5 outputs a signal that is turned on at a predetermined level at which the output of the speaker 2 is normal, and is turned off otherwise. The switch 6 is alternately switched according to these ON or OFF signals. When the switch 6 is turned on, the power from the DC power supply 7 is charged in the capacitor 8, and when the switch is turned off, the charge of the capacitor 8 is transferred to the capacitor 9 and the holding relay 10 Is supplied to the holding relay 1 by repeating charging and discharging of the capacitor 8 at a certain timing.
The operation of 0 is held.

As a result, the contact 11 is kept on, the display circuit 13 is connected to the power supply 12, and the speaker 2 is turned on.
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 a repeated ON / OFF signal despite the test signal being input to the audio signal output circuit 1,
Since the charging and discharging of the capacitor 8 are 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 no display is made that the alarm device is normal. That is, an abnormal display is performed. Therefore, in this case, repair, repair, or replacement of the alarm device is encouraged, and by taking necessary measures as soon as possible, it becomes possible to prepare for an alarm in an emergency.

[0014]

As described above, according to the present invention, a test signal detector for detecting a periodic test signal output from a speaker, and the output of the speaker is normal based on the test signal. An on / off signal output circuit that outputs a signal that is turned on at a level and turned off otherwise, and a holding relay that is held only when the on / off signal output circuit periodically outputs an on / off signal And the result output circuit outputs a determination result as to whether or not the output of the speaker is normal according to the operation state of the holding relay, so that an emergency alarm can be reliably output from the speaker. And automatically test the status of alarm output, thus preventing alarm delays and alarm output stoppage due to alarm device failures, and confirming the benefits such as emergency evacuation. There is an effect that can be in such things.

[Brief description of the drawings]

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

[Explanation of symbols]

Reference Signs List 1 audio signal output circuit 2 speaker 3 test signal detector 5 on / off signal output circuit 10 holding relay 13 display circuit (result output circuit)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-151725 (JP, A) JP-A-60-77296 (JP, A) Real opening Sho-59-165097 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) G08B 23/00-29/10

Claims (1)

(57) [Claims] An audio signal output circuit for outputting an alarm signal and a periodic test signal to a speaker, respectively.
A test signal detector for detecting the test signal output from the speaker, and based on the test signal detected by the test signal detector, the output of the speaker is turned on at a normal level, and otherwise turned off. An on / off signal output circuit for outputting a signal, a holding relay held only when the on / off signal output circuit periodically outputs an on / off signal, and an operation state of the holding relay.
The result of the judgment whether the output of the above speaker is normal
And a result output circuit for outputting the alarm output.