JPS60164299U

JPS60164299U - Fire alarm system malfunction prevention device

Info

Publication number: JPS60164299U
Application number: JP5015584U
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: JPH0319034Y2

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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来例の回路図、第２図は本考案の一実施例の
回路図、第３図は同上の要部の回路図、第４図は同上の
動作説明用のタイムチャートであ　　　゛す、１ａは煙
感知器、１ｂは熱感知器、２は発信機、４は回線電圧検
知回路部、５はスイッチング回路部、６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
、ｒｏはリレー接　　　　′点、Ｒｙは受信リレーであ
る。及　　−Ｒｙｒ　　戸ｙ２ −　ローＭ　　ｍｌ　　Ｌ２１１１士」Fig. 1 is a circuit diagram of a conventional example, Fig. 2 is a circuit diagram of an embodiment of the present invention, Fig. 3 is a circuit diagram of the main part of the same, and Fig. 4 is a time chart for explaining the operation of the same. 1a is a smoke detector, 1b is a heat sensor, 2 is a transmitter, 4 is a line voltage detection circuit section, 5 is a switching circuit section, 6 is a high sensitivity relay, 7 is a first timer circuit section, 8 is the second timer circuit, ro is a relay contact, and Ry is a receiving relay. -Ryr door y2 - low M ml L2 111shi”

Claims

[Scope of utility model registration request]

With the common line side as the positive pole and the sensor connection line side as the negative pole, apply DC voltage between the common line and the sensor connection line via the receiving relay in the receiver, and apply the DC voltage between the sensor connection line and the common line. is a fire alarm system in which a transmitter, a heat detector, and a smoke detector are connected in parallel, and when the heat detector or smoke detector is turned on, an exciting current is sent to the receiving relay through the sensor. a line voltage detection circuit that generates an output when the voltage applied between the line and the sensor connection line changes to a predetermined level, and the detection output of the line voltage detection circuit drives a switching means that operates faster than the receiving relay. a first timer circuit unit that starts a time-limited operation from the start of operation of the switching circuit unit and sets the switching circuit unit in an on-operable state until a time-out; and the first timer circuit. a second timer circuit section that starts a time-limited operation from the time-up of the section and sets the switching circuit section in an OFF state until a preset time has elapsed; A malfunction prevention device for a fire alarm system, characterized in that the device opens at least the starting end of either a sensor connection line or a common line.