1. The (prototype) C&V Framework component used for the SPD Cooling Control A.Tauro, G.De Cataldo

2. The SPD cooling system Pumps perfluorobutane (C 4 F 10 ) in the SPD cooling circuits Evaporation of C 4 F 10 at approximately 15ºC Vapor drawn back by a membrane compressor Condensation by means of a constant supply of chilled water Cooling power of approximately 3kW, distributed over 10 loops

3. The SPD cooling system control The process of the SPD cooling system is controlled by a dedicated Schneider PLC  Process Control: Common outlet pressure controlled by the liquid pump speed Common inlet pressure controlled by the compressor speed Operating cycle (Stop, Stand-By, Run end Recovery) General System Status (Alarm and Warning)  Distribution Control: the PLC doesn’t control the distribution lines except the OPENED- CLOSED-LOCKED status of each loop.

4. The cooling plant Although the cooling plant in the figure is the one for the HMPID, it looks like the one of the SDD. This is of help to describe its main parts and related functions: the rack on the left contains pumps, the cooling liquid, heat exchanger, loop connection and all the relevant actuator to monitor and control the hardware; On the left rack are located respectively: The local operator panel that allows for a full monitoring and plant control; The Schneider PLC; The cable connector.

5. Final communication scheme Alice HMPID ALICE DCS & detector DCS Process PLC MODBUS TCP/IP Gateway PLC TIM TS/CV SCADA Gateway PLC CCC TS/CV SCADA Actual communication scheme In order to safely manage the communication between all the process PLCs of the ALICE experiment and the technical network, the TS/CV/DC group will install the Gateway PLC in the experimental cavern. SPD Process PLC CCC = CERN Control Center TIM=Technical Installation Monitory DSS= Detector Safety System TIM Available Digital programmable I/O (ex: relays for Interlocks) MODBUS TCP/IP CCC TS/CV SCADA

6. The FSMs of the SPD cooling plant and their integration in the DCS STOPSTAND-BY RUNRECOVERY Operating cycle OK WARNINGALARM General System Status Automatic recovering when the warning is over cooling DCS During the pre-installation phase, it is under the responsibility of each sub-detector to integrate the cooling FSMs in the DCS. A possible hierarchy is presented in figure. Details can be discussed case by case. In the ACC is under way the discussion of a project integrating, after the pre- installation phase, all the ALICE cooling plants in a unique control system. Exit on local RESET Severe alarm condition

7. The prototype of the C&V FW Component PVSS 3.01 SP1 fwCoolingAndVentilation 0.14:  This tool is not yet official. The official version will be released in the next months after the collection of the comments and suggestion from the 4 LHC experiments SCY file (20-01-06) for the SPD:  ready for the gateway PLC  The time schedule for delivering to others sub-detectors the updated SCY file is not jet available, but it is under discussion in the ST/CV group. For the HMPID it is foreseen not before the end of march.

8. The Plant and Loop configuration panels in the FW component

9. The synoptic panel of the SPD cooling plant Each sub-detector has to provide a similar synoptic panel with the representation of the cooling system and possibly the detector. It can be integrated either in the FW component either in the monitoring zone of the FSM control panel ( see the presentation on: Standardization of the DCS control panels)

10. Conclusions The FW component and the updated SCY file ( provided by the TS/CV group ) have been successfully tested with the SPD cooling plant; For the HMPID the SCY file will be released not before the end of march 06, and for the remaining cooling plants the schedule is being studied; During the pre-installation, the cooling plant control has to be done at level of single sub-detector; therefore the corresponding cooling FSM has to be integrated in each DCS. Each sub-detector has to prepare a synoptic panel with the representation of the cooling system and possibly the detector. This panel can be used in both the FW component and in the FSM control panel.