JPS60164296U

JPS60164296U - Fire alarm system malfunction prevention device

Info

Publication number: JPS60164296U
Application number: JP5015284U
Authority: JP
Inventors: 正樹野林; 茂松本
Original assignee: 松下電工株式会社
Priority date: 1984-04-05
Filing date: 1984-04-05
Publication date: 1985-10-31
Also published as: JPH0319032Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は火報システムの誤動作防止装置の基本的な概略
回路図、第２図は本発明の一実施例の回路図、第３図は
同上の動作説明図であり、１ａは煙感知器、１ｂは熱感
知器、２は発信機、３は回線電圧検知回路部、４はスイ
ッチング回路部、５は高感度リレー、７は第１のタイマ
回路部、８は第２のタイマ回路部、９は誤動作防止回路
部、１０は限時時間調整回路部、Ｒ工は抵抗、■Ｒ１・
・・は可変抵抗、１□・・・は感知器接続線、ＩＣは共
通線、Ｒｙ。・・・は受信リレーである。Fig. 1 is a basic schematic circuit diagram of a malfunction prevention device for a fire alarm system, Fig. 2 is a circuit diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of the same operation, and 1a is a smoke detector. , 1b is a heat sensor, 2 is a transmitter, 3 is a line voltage detection circuit section, 4 is a switching circuit section, 5 is a high-sensitivity relay, 7 is a first timer circuit section, 8 is a second timer circuit section, 9 is a malfunction prevention circuit section, 10 is a time limit adjustment circuit section, R is a resistor, ■R1.
... is a variable resistor, 1□... is a sensor connection line, IC is a common line, Ry. ... is a receiving relay.

Claims

[Scope of utility model registration request]

DC voltage is applied between the common line and each sensor connection line through the receiving relay in the receiver, and a transmitter, heat sensor, or smoke detector is connected between each sensor connection line and the common line. In a fire system in which a heat detector or a smoke detector is connected in parallel and an excitation current is sent to the receiving relay through the sensor when the sensor is turned on, the voltage applied between the common line and each sensor connection line, a line state detecting means that generates an output when the line current changes to a predetermined level; a switching circuit section that drives a switching means whose operating time is faster than the receiving relay based on the detection output of the line state detecting means; a first timer circuit section that starts a time-limited operation from the start of operation and sets the switching circuit section in an on-operable state until a time-up; and a second timer circuit section that sets the switching circuit section in an OFF state until a set time elapses. A malfunction prevention circuit section is provided in which at least one of the starting end portions is open, and is provided corresponding to each sensor connection line,
A time limiter that operates when the voltage between the sensor connection line and the common line changes to the above-mentioned predetermined level and connects a variable resistor for time-limit adjustment in parallel to the time constant resistor of the first timer circuit section. A malfunction prevention device for a fire alarm system, comprising a time adjustment means.