JPS5813431Y2 - Fire alarm equipment recovery circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a recovery circuit for fire alarm equipment.

To explain the restoration circuit of a conventional fire alarm system with reference to Fig. 1, RE is a receiver, N, , N2 to Nn are district relays for each line provided corresponding to each caution area, and each of the above-mentioned receivers RE A line extending from L1. A sensor D connected between L2 to Ln and a common line Lc paired with them
E1, ~1 m.

DE2]~2m-DEnl~nm and the power supply E through a common recovery switch S, and its own make contact n1. It is also connected to the power source E through n2 to nn and the recovery switch S.

For example, if any of the sensors DE11 to DE1m operates and the district relay N1 operates, then that relay N
1 is maintained in operation by its own make contact n1, and is then disconnected from the power source E by operating the recovery switch S to recover.

In the recovery circuit of such conventional fire alarm equipment, the recovery switch S is simply connected to each line in common, so when the recovery switch S is operated and opened, the district relay N1.
All lines of the circuits N2 to Nn are disconnected from the power supply E.

Therefore, for example, by simulating smoke etc. at the site, each sensor DE11~1m, DE21~2m is sequentially generated.
- When performing an operation test for DEn1 to nm, it is important to note that the detector is an ionization type smoke detector or a photoelectric type smoke detector that requires a certain amount of time after energization to reach a steady state in which it can accurately detect a fire. , recovery switch S each time the test is completed.
When you operate each sensor DE11 to 1 m in steady state
, DE21~2 m-DEnl ~nm is restored each time, so even if a fire occurs, it will not work until it returns to steady state again, so in the line under test, that area will be monitored by the tester. Therefore, there is no problem, but there are drawbacks such as the detection is delayed especially in the case of other lines, and the above tests cannot be divided and performed in parallel, so it takes a long time.

In view of the above points, the present invention has been developed by separately connecting circuits that are opened by the operation of the relays, etc., in parallel with a common recovery switch for each line, so that the lines that are operating when the recovery switch is operated are The Q also eliminates the above-mentioned drawbacks by disconnecting only the power supply from the power supply.

Next, one example of this will be explained with reference to FIG. 2. In the receiver RE, the break contacts n] b + n 2 b-n n b of the district relays N, , N2 to Nn are connected to each line for loop prevention. Diode DI, D2~
Dn, the relays N1. It is the same as in FIG. 1 except that a series circuit of resistors R, R2 to Rn and capacitors C1 and C2 to Cn is connected in parallel with N2 to Nn (make contact nia).

n2a-nna are nl, n2~rj in Fig. 1
(corresponds to y1).

In normal times, in addition to the recovery switch S, each line has its own break contact NLB.

It is also connected to the power supply E through n2b-nnb.

For example, if one of the sensors DE11 to DE1m operates, the district relay N1 closes its own make contact nla and maintains its operation, as in the case of FIG. 1, but the break contact nib opens, so the relay The self-holding circuit of N1 will be configured only through the recovery switch S.

Therefore, when the recovery switch S is operated, only the line of the operating relay N1 is disconnected from the power supply E, and the relay N1 is restored.

Note that the above resistors R, , N2 to Nn and capacitors CI, C2
~Cn, once the operating relays N1, N2~Nn are restored by operating the recovery switch S, the line that is disconnected from the power supply E becomes the break contact nlb, n2.
Since it is connected to power supply E again through b-nnb,
If the time disconnected from the power source E is short, the active sensor DEI, ~l m.

Since DB21-2m-DEnl-nm may not be completely restored, this relay is provided to delay the restoration of the relays N, , N2-Nn.

As described above, according to the present invention, the circuits that are opened by the operation of the relays, etc., are connected separately in parallel with the recovery switch common to each line, so that when the recovery switch is operated, the circuits are connected separately. Only the line is disconnected from the power supply, and other lines are not affected at all, and the sensors on the other lines remain in a steady state.

Therefore, even during the above test, if a fire occurs on other lines, it will be detected immediately, and the above test can be divided into appropriate lines and carried out in parallel, so it is possible to conduct the above tests in parallel with other lines, such as in large buildings. It has the excellent effect of allowing tests to be carried out in a short period of time even in cases where

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing the restoration circuit of a conventional fire alarm system.
FIG. 2 is a circuit diagram showing an embodiment of the present invention. RE...Receiver, N1. N2～Nn・・・・・・
・District rele, n 1 a, n2a=n Ha”・
District relay N1. N2 to Nn make contacts, n l b
r n 2b -n nb"" District Relay N1. N2
~Nn break contact, DE11~i m, DF4
1~2m-DEnl~nm""sensor, S...
・Recovery switch.

Claims (1)

[Scope of utility model registration request] In a fire alarm system in which a detector for each line and a relay, etc. that operates self-maintaining depending on the operation of the sensor are connected to the power supply through a common recovery switch for each line, the above-mentioned relay, etc. operates in parallel with the recovery switch. A recovery circuit for fire alarm equipment that is made up of circuits that are opened by the circuits and are connected to each other separately.