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Rack Safety System

Rack Safety System. DSS Advisory Board 06.10.2003 Christoph Schäfer. Introduction. The Rack Safety System is a proposal of CMS and was discussed during the September CMS week in detail. It does not replace the Rack Monitoring and Control System (RMCS),

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Rack Safety System

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  1. Rack Safety System • DSS Advisory Board 06.10.2003 • Christoph Schäfer

  2. Introduction The Rack Safety System is a proposal of CMS and was discussed during the September CMS week in detail. It does not replace the Rack Monitoring and Control System (RMCS), but it’s a complement and collects all directly safety relevant signals

  3. Philosophy Split purely safety relevant information from monitoring & contol information Detector Level: DCS & DSS Rack Level: RCMS & RSS

  4. Rack Monitoring & Control System The RMCS could be seamlessly integrated into the DCS • reads out the ELMB’s • two temperature sensors • speed of tangential fans • humidity sensor, etc. • cuts power to rack(s) via software • allows for trending and preventive maintenance Hardwired safety signals could be integrated into a Rack Safety System (RSS)

  5. RSS Inputs • Smoke Sensors (2 per rack, logical AND) • installed by ST/MA (Centrale Incendie) • Thermal Switch • provide current loop • Signal from the Detector Safety System (DSS) • RSS stores the rack map The RSS has to deal with 3 inputs/rack and should memorize all inputs

  6. RSS Actions • cuts power to rack • by sending first a signal to DCS in order to shut down power gracefully • and after adjustable delay hardwired cut • electronic equipment is best protected • enables power to racks • triggers fire extinguishing system • foreseen for all UXC racks from the beginning The RSS has to trigger 2 actions/rack Flexible logic needed

  7. Power Cut • Each rack (320) and AC/DC converter (400) is controlled by a remotely controlled relay • each relay can be opened/closed by a current loop provided by RSS • RSS and all realys are in the service cavern • ST/EL uses only RS485 to power on/off racks and AC/DC converters (granularity to be defined)

  8. Power Cut • CMS uses exclusively the RSS current loop to switch on/off racks and AC/DC converters • CMS has priority to keep rack or AC/DC converter off

  9. Power Cut • Inside a rack there is no relay but a Power Distribution Chassis (PDC) • A PDC comprises 5 manually resettable fuses: • turbine • 3 crates • distribution box

  10. 200 US racks 120 UX racks 400 UX ADC smoke detection 200 120 80 thermal switch 200 120 400 fire ext. none 120 ? DSS 40 30 80 Number of Channels grand total: 2110

  11. RSS = DSS Clone • All necessary functionality of RSS already incorporated in DSS • Essentially no development for RSS needed • ELMB card read out by the RMCS, no modification necessary

  12. DSS Power DCS Centrale Incendie RSS T T T E E E DCS ELMB ELMB ELMB ST/EL S S S S S S S Smoke Sensor T Thermal Switch E Fire Extinguisher

  13. Gas Line Detection Line N2 or FM200 RSS Fire Extinguishing

  14. Summary • Rack Monitoring & Control System • use current ELMB cards, no modification • Rack Safety System • use existing DSS hardware, no development • about 2000 channels This CMS proposal covers:

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