MICE Hydrogen Control System MICE Collaboration Meeting CM33 27 th July 2012 PJ Warburton – STFC Daresbury Lab.

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Presentation transcript:

MICE Hydrogen Control System MICE Collaboration Meeting CM33 27 th July 2012 PJ Warburton – STFC Daresbury Lab

Control System Functions Operate Valves Monitor - Temp Pressure, Flow & Vacuum Control - Vac Pumps, Heater Chiller & Cryo-Cooler Run Control Sequences Gas Detection System Extract System UPS

Control System P&ID

Control PLC Omron CJ1M Modular PLC with Ethernet Existing Software for Link to EPICS NS8 Programmable Terminal (HMI), 8.4 inch Touch Screen with Ethernet Key Switches on Selected Functions

Intrinsic Safety (Ex i) Limit energy in electrical circuits to less then the value required to ignite Hydrogen (20 micro 25%) All Circuits in the Gas Panel Temp & Level sensors in Cryostat Cryostat Heaters are protected by pressure interlock (SIL Rated)

Control System Valve air solenoids mounted on the outside of the Gas Panel Enclosure Valve limit switches are intrinsically safe and can detect short circuits and broken wires, Pressure transducers are 4-20mA giving broken wire detection. The PLC provides start / stop signals to pumps; manual control is also available. Note:- PLC status does not affect pump operation i.e. the pumps do not go off if the PLC does.

Gas Detection System Oliver Tocsin 920 All Detectors and Beacons paired on separate bus loops Warning at 25% LEL Alarm at 50% LEL Linked to Extraction System to increase speed on detection of leak Annual Testing / Maintenance by contractor

Extraction System Two Inverter controlled 7.5kW Fans mounted on the roof One fan on its own can providing the flow rate required to deal with a leak. (DSEAR rec = 450 air changes per hour). Differential Pressure Sw & Inverter Current feedback to prove operation Normal running at 100 ACH with increased speed on detection of leak

UPS 20kVA UPS - 2 Hour back up of Fans & Control System PLC, Heaters, Vac Gauges etc 50 min to boil off LH2 In Cryostat Annual Testing / Maintenance by contractor

Safety Functions & Interlocks Operation of the Ventilation System on Detection of a Hydrogen Leak – Hardwired Shut PV20 if there is a Pressure Rise in the Cryostat during operation Cryostat Insulation Vacuum Poisoning to boil off gas if heaters fail / can not be used A Shut-off Facility for the Hydride Bed Heater/Chiller on Detection of Bed Overpressure Cryocooler Shut-off if Temperature drops below Hydrogen Freezing Point (14k) or Heaters Faulty

Control Sequences Helium Purge Helium Supply Line Purge Helium Fill Helium Empty He Purge H2 Side Hydride Bed Charge Hydrogen Fill Hydrogen Empty Cryostat Vacuum Diagnostic / Test

Typical Sequence Screen Seq Start PB Valve Position Pump Control Plant Status Ind Pressure & Flow Readout Current Step Highlighted

Typical Data Log Screen Data Logging of Key Data Scroll Back 24H Files saved to Compact Flash Card Numeric Readout

Hydrogen Control Room Layout New Door (1 Hour Fire Rated) UPS Installed Gas Detection Installed Ready for H2 Testing

Questions