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MICE Hydrogen Control System
MICE Collaboration Meeting CM3327th July 2012PJ Warburton – STFC Daresbury Lab
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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
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Control System P&ID
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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
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Intrinsic Safety (Ex i)• Limit energy in electrical
circuits to less then the value required to ignite Hydrogen(20 micro J @ 25%)
• All Circuits in the Gas Panel
• Temp & Level sensors in Cryostat
• Cryostat Heaters are protected by pressure interlock (SIL Rated)
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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.
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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
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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
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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
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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
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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
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Typical Sequence ScreenSeq Start PB
Valve Position
Pump ControlPlant Status Ind
Pressure & Flow Readout
Current Step Highlighted
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Typical Data Log Screen
Data Logging of Key Data
Scroll Back 24H
Files saved to Compact Flash Card
Numeric Readout
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Hydrogen Control Room Layout
•New Door (1 Hour Fire Rated)
•UPS Installed
•Gas Detection Installed
•Ready for H2 Testing
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Questions