Monitor system for operation of solenoid operated devices
US4263580A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1977 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Aug 22, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C25/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Command words with address signals are transmitted periodically from a control room to field solenoid valves which are each provided with a single actuation circuit. The solenoid valves that are to be actuated in the field each correspond to the address of the transmitted command words which energize the coil of the corresponding solenoid valve. The actuation circuit inserts an address signal for that particular circuit with regard to current information flowing in the energized coil and sends it back to the control room as an acknowledge word. The control room previously predicts acknowledge words which will be sent back by the actuation circuits when the actuation circuits properly respond to the transmitted command words and the control room registers the predicted acknowledge words as reference words. The acknowledge word sent back by the actuation circuit is compared with the reference word and if an inconsistency exists a fault in the actuation circuit is indicated. The command words includes a control signal N to continuously energize the solenoid valve and a test signal for momentarily energizing the solenoid valve for test. These signals are transmitted from the control ro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.