JPS5834879B2 - multiple alarm circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiple alarm circuit, and an object of the present invention is to improve the reliability of alarm operation even in response to a plurality of alarm inputs.

FIG. 2 shows an example of a conventional multiple alarm circuit.

When an alarm input is input to this circuit, alarm relay Rn
The sound device Bz makes a sound when the relay contact is closed.

To stop the sound of the acoustic device The current flowing through device Bz is cut off, and the ringing stops.

However, when the sound device stop relay RB operates, the normally open contact rb1 also closes to form a self-holding circuit, so even if the sound stop switch SB is opened, the sound device stop relay RB is still in the operating state. Therefore, once the sounding of the sound device Bz stops, the sounding device Bz will not sound even if the next alarm is applied unless the previous alarm input is resolved, which reduces the reliability of the operation in response to the alarm input. I have doubts.

In view of these problems, the multiple alarm circuit according to the present invention connects a delay relay to each relay contact of a plurality of alarm relays activated by an alarm input, and connects the relay contact and other plurality of relays. The relay contacts of the delay relay are connected in series to the contacts, a multiple alarm relay is connected to the common end of the relay contacts, and an acoustic device ringing relay is connected to the relay contacts of the multiple alarm relay, so that the acoustic The series circuit of the relay contact of the device sounding relay and the sound device stop switch is connected in parallel to the relay contact of the multiple alarm relay, and the sound device is connected to the other relay contact of the sounding device sounding relay. The circuit is connected between the DC power supply terminals to improve the reliability of the operation for multiple alarms.

A multiple alarm circuit according to the present invention will be explained below with reference to the drawings.

R1...Rn are n alarm relays activated by n (plural) alarms manually, and each relay contact r1...rn of this alarm relay is connected to a delay relay T, respectively.
1...Tn are connected in series, and the relay contacts r1...rn and a plurality of other relay contacts r1...rn are connected in series.
The relay contacts t1...tn of the delay relays T1...Tn are connected in series to the delay relays T1...Tn, respectively.

Tx is a multiple alarm relay, and its relay contact tx is connected in series with the audio device ringing relay RB to form a series circuit of one relay contact (rl) of the audio device ringing relay RB and the audio device stop switch SB. Relay contacts txI are connected in parallel.

Bz is an audio device, and the relay contact rd and another relay contact rd? These are connected in series.

The above circuit is then connected between terminals E of the DC power supply.

The multiple alarm circuit according to the present invention is constructed as described above, and its operating state will be described next.

When an alarm input is input, the alarm relay Rn corresponding to the input terminal operates and the relay contact r of that alarm relay Rn
n and rn are closed, and the delay relay Tn button and multiple alarm relay Tx operate.

When the multiple alarm relay Tx operates, its relay contact tx
is closed, so the sound device ringing relay RB operates and its two relay contacts rb and rb are closed and the sound device Bz
sounds.

The delay relay Tn will complete its operation after a few seconds, so
The relay contact tn is opened and the multiple alarm relay Tx becomes inactive, and the relay contact tx is opened and returns to its original state, but due to the closing of the relay contact rb connected in series with the audio device stop switch SB, Sound device ringing relay RB
Because G is self-maintaining, the acoustic device Bz continues to make a sound.

Therefore, when the audio device stop switch SB is opened, the self-holding state of the audio device ringing relay RB is released, and the relay contact rb connected in series with the audio device Bz is opened, so the sounding of the audio device Bz is stopped. It is.

At this time, if another alarm input different from the one described above is input, the same operation is repeated and the sound device Bz sounds again.

As described above, the multiple alarm circuit according to the present invention connects a delay relay to each relay contact of a plurality of alarm relays activated by an alarm input, and connects the delay relay to the relay contact and the other plurality of relay contacts. Connecting the relay contacts of the delay relays in series, connecting a multiple alarm relay to a common end of the relay contacts, and connecting the relay contacts of the multiple alarm relays,
connect a sound device sound relay, connect a series circuit of a relay contact of the sound device sound relay and a sound device stop switch in parallel to a relay contact of the multiple alarm relay, and connect another relay of the sound device sound relay; Since the sound device is connected to the contact point and these circuits are connected between the DC power supply terminals, after the sound device has stopped, by returning the sounding relay to its original state, one alarm input will be input and the sound will be activated. If an alarm input is received while the device is stopped, the acoustic device will sound again, which has the effect of further increasing the reliability of alarm operation notification.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of a multiple alarm circuit according to the present invention, and FIG. 2 is an electric circuit diagram of a conventional example corresponding to the circuit of the present invention. R1...Rn are alarm relays activated by n alarm inputs, rl...rn are relay contacts of alarm relays R1...Rn, T1...Tn are delay relays, tl...
tn is a relay contact of delay relay T1...Tn, Tx is a multiple alarm relay, tx is a relay contact of multiple alarm relay Tx, RB is a sound device ringing relay, rb, rb is a relay contact of the sound device ringing relay RB, SB is the sound device stop switch, and Bz is the sound device.

Claims (1)

[Claims] 1. Connecting a delay relay to each relay contact of a plurality of alarm relays activated by an alarm input, and connecting the relay contacts of the delay relay in series to the relay contact and the other plurality of relay contacts, Connect a multiple alarm relay to the common end of the relay contact, connect a sound device sound relay to the relay contact of the multiple alarm relay, and connect the relay contact of the sound device sound relay to the sound device stop switch in series. A multiple alarm, in which a circuit is connected in parallel to a relay contact of the multi-activity alarm relay, an acoustic device is connected to another relay contact of the acoustic device sounding relay, and these circuits are connected between DC power supply terminals. circuit.