EP 0362798 A3 19910116 - METHOD FOR THE ENERGY-SAVING OPERATION OF RISK DETECTORS IN A RISK DETECTION ARRANGEMENT
Title (en)
METHOD FOR THE ENERGY-SAVING OPERATION OF RISK DETECTORS IN A RISK DETECTION ARRANGEMENT
Publication
Application
Priority
DE 3834044 A 19881006
Abstract (en)
[origin: EP0362798A2] The system operating in accordance with the principle of chain synchronization, comprising a central station (Z) having several two-core primary signalling lines (ML), to which a plurality of detectors (Mn) are connected in the form of a chain which are regularly cyclically activated from the central station (Z) and are interrogated for their respective analog detector measurement value, in each case uses detectors (Mn) which exhibit a voltage measuring device (MU) which monitors the applied line voltage (UL), a subsequent logic circuit (VL) with associated sensor part (S), a subsequent control device (St), an energy accumulator (C) and a switching transistor (T). The logic circuit (VL) is essentially formed by a microprocessor which can be connected and disconnected. According to the invention, the microprocessor is switched into a current-saving standby condition and switched on again in dependence on particular switching criteria which are specific for the hazard signalling system, a required start-up time (tan) being ensured for the microprocessor. For example, the microprocessor is switched to the standby condition in dependence on a particular line voltage (disconnecting voltage UAB=UR) and switched on again with the presence of another predetermined line voltage (connecting voltage UAN=US) so that the detector is activated after a particular start-up time (tan=ts). <IMAGE>
IPC 1-7
IPC 8 full level
G08B 26/00 (2006.01)
CPC (source: EP)
G08B 26/005 (2013.01)
Citation (search report)
- [A] EP 0125485 A1 19841121 - SIEMENS AG [DE]
- [A] GB 2131991 A 19840627 - PHILP ROBERT
- [A] EP 0279697 A2 19880824 - NEC CORP [JP]
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0362798 A2 19900411; EP 0362798 A3 19910116; EP 0362798 B1 19940209; AT E101445 T1 19940215; DE 58906937 D1 19940324
DOCDB simple family (application)
EP 89118339 A 19891003; AT 89118339 T 19891003; DE 58906937 T 19891003