1. André Augustinus 16 June 2003 DCS Workshop Safety

2. André Augustinus 16 June 2003DCS Workshop 2 Safety Systems  What is Safety: Safety of people (prevent injuries or worse) Safety of equipment (protect capital investment)  CERN Safety System Covers Level3 alarms (Fire, Gas etc.)  DCS ensures integrity through: Alarm reporting (for operator intervention) and automation Detailed control on detector level and control of infrastructure and services (with high granularity) Interlocks on detector level

3. André Augustinus 16 June 2003DCS Workshop 3 Context  Control and safety systems will act directly on the equipment at the experiment site; such as: Detectors with their related equipment Racks and crates Gas systems Cooling systems Magnets Power distribution Water distribution General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Technical Services provide power, water, primary gas (general services) and distribute them to the different locations (experiment services). Based on slides of Stefan Lüders (DSS Team)

4. André Augustinus 16 June 2003DCS Workshop 4 Context  Sensors monitor the state of the equipment: temperature (equipment, ambient air, water), humidity, water leak water-flow, Smoke and gas, status signals of the detectors  There are dedicated sensors for the different safety and control systems General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors Based on slides of Stefan Lüders (DSS Team)

5. André Augustinus 16 June 2003DCS Workshop 5 CCS (cooling) Control systems  The various control systems are responsible for the overall monitoring and control of the detector or services.  They will take corrective action to maintain normal operation.  All control systems are interconnected. General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors monitor control DCS sub-system C DCS sub-system B DCS sub-system A MCS (magnets) GCS (gas) ST/CV (water) ST/EL (power) Trip Based on slides of Stefan Lüders (DSS Team)

6. André Augustinus 16 June 2003DCS Workshop 6 Safety system (CSS)  The safety for personnel is ensured by the CERN Safety System (CSS). It is required by law and conforms to relevant International, European, and National standards.  It has its own sensors and reacts globally, i.e. on whole buildings or caverns General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors DCS sub-system C DCS sub-system B DCS sub-system A CSS Based on slides of Stefan Lüders (DSS Team)

7. André Augustinus 16 June 2003DCS Workshop 7 Safety system (CSS) General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors DCS sub-system C DCS sub-system B DCS sub-system A CSS Smoke, Gas Leak TCR Fire Brigade to P2 Based on slides of Stefan Lüders (DSS Team)

8. André Augustinus 16 June 2003DCS Workshop 8 Local safety systems (e.g. MSS, Interlocks) General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors DCS sub-system C DCS sub-system B DCS sub-system A  Local safety systems preserve the integrity of well defined systems The Magnet Safety System protects the magnets Interlocks protect detectors MSS Water fail Ramp down magnet Gas fail Ramp down High Voltage Based on slides of Stefan Lüders (DSS Team)

9. André Augustinus 16 June 2003DCS Workshop 9 Is that all ? General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors DCS sub-system C DCS sub-system B DCS sub-system A  Does this cover all events?  What happens if a control room gets hot? Only action if individual items overheat (or burn…)  What happens if there is a water leak in the racks? Only action if electronics get wet and short-circuit…  What happens if T goes up in detector? Only action if one of detectors see it Based on slides of Stefan Lüders (DSS Team)

10. André Augustinus 16 June 2003DCS Workshop 10 Detector Safety System General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors DCS sub-system C DCS sub-system B DCS sub-system A  DSS covers some of the functionality that was covered by GSS in LEP times (and is not covered by CSS and DCS)  Name might be misleading, DSS covers more than only detector safety Think of it as experimental area surveillance system Water Leak DSS Based on slides of Stefan Lüders (DSS Team)

11. André Augustinus 16 June 2003DCS Workshop 11 Experiment DCS Detector Safety System General services: power, water Experiment services: gas, cooling, magnet Experiment: detectors, racks, crates Sensors DCS sub-system C DCS sub-system B DCS sub-system A  DSS is embedded in the experiment DCS system DSS Based on slides of Stefan Lüders (DSS Team)

12. André Augustinus 16 June 2003DCS Workshop 12 DSS project  Four LHC experiments defined requirements  JCOP project started May 2002  Prototype has been build by DSS team  Review has taken place earlier this month  Installation for CMS and LHCb this year  Installation for ALICE next year Will have to define requirements of first installation by the end of this summer

13. André Augustinus 16 June 2003DCS Workshop 13 DSS Implementation  A redundant PLC solution (Siemens) has been chosen for the ‘front-end’ (similar to the new safety system of the Mont Blanc tunnel)  CPUs are comfortably separated to minimize danger of accidental damage Cavern Surface Shaft Optical Link  Interconnection with optical link Based on slides of Stefan Lüders (DSS Team)

14. André Augustinus 16 June 2003DCS Workshop 14 DSS Implementation  Redundant cables running through two cable paths. Spares for all cables are foreseen. Cavern Surface Shaft Optical Link PROFIbus DSS COM CERN LAN  Internal DSS Network  Connection to outside world through “gateway” Based on slides of Stefan Lüders (DSS Team)

15. André Augustinus 16 June 2003DCS Workshop 15 DSU Layout Patch Panel Terminals to connect sensors / actuators Table / Drawer Control Room Panel, Gyro & Siren (not part of a DSU) External Crate with dedicated Monitoring Module 2 nd External Crate possible Ethernet Switch for DSS COM (in DSUs with CPU crate) CPU crate (in two DSUs) Redundant 24V Power Supply & a Distribution Module Front-End Display OPC Server / Gateway (in one DSU) Uninterruptible Power Supply (UPS) 52 units standard LEP rack (here: 56U) Based on slides of Stefan Lüders (DSS Team)

16. André Augustinus 16 June 2003DCS Workshop 16 DSS implementation  The ‘back-end’ (configuration and user panels) is based on PVSS  Maintenance and support will be done by a central team

17. André Augustinus 16 June 2003DCS Workshop 17 DSS  Will cover mainly water temperature and ambient temperature measurements; some water leak detection  A limited amount of detector inputs and outputs are foreseen Detector needs will be studied case by case

18. André Augustinus 16 June 2003DCS Workshop 18 Example  To illustrate the fact that the DCS, DSS and CSS systems are complimentary Use a counting room as example

19. André Augustinus 16 June 2003DCS Workshop 19 T T ambient T Rack T switch T ambient only for monitor If T Rack too high  act on equipment in the rack If T switcht too high  stop power to rack (hardwired) DCS

20. André Augustinus 16 June 2003DCS Workshop 20 T T water T1T1 T2T2 T3T3 T4T4 Vlv in Vlv out Water Leak Power close valves stop power If 2 out of ( T 1, T 2, T 3, T 4 ) too high  stop power If T water too high  stop power If valves closed  stop power If Leak  stop power (also to CR below!) and close valves If no Power  Signal det a and/or det b and/or det c If Det 1 or Det 2  Signal det a and/or det b and/or det c Det 1 Det 2 det a det b det c DSS

21. André Augustinus 16 June 2003DCS Workshop 21 T Smoke In case of smoke  stop power (to all counting rooms) CSS

22. André Augustinus 16 June 2003DCS Workshop 22 Summary  There is not much for you to do (for once…) The activity is concentrated in the central team, with the ‘pit operation’ team and Glimos But, let us know if you think of a parameter that could be input to the DSS and act on your detector or equipment