[email protected] 01/10/2009 1 PHOS Cooling status (1 Oct) Incident happened (ECV failure) 1...
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01/10/2009 1 ALICE-PHOS Alexei.Kuryakin@cer n.ch PHOS Cooling status (1 Oct) Incident happened (ECV failure) 1 Oct at 5 Am cooling plant failure happened: ECV (electrical control valve) controller alarm raised due to battery failure (a small battery inside controller) Compressors worked as usually, but freon didn’t flow because ECV was closed, so cooling liquid temperature start to increase. At 10 Am interlock blocking occurred because liquid temperature increase up to 25°C At 1 Pm after analysis problem temporary fixed: ECV switched on in manual mode and 43% opened. But that is only temporary solution: battery should be replaced to new one ASAP. PHOS cooling now working in normal operation mode.
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Transcript of [email protected] 01/10/2009 1 PHOS Cooling status (1 Oct) Incident happened (ECV failure) 1...
01/10/2009 1
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct)Incident happened (ECV failure)
1 Oct at 5 Am cooling plant failure happened: ECV (electrical control valve) controller alarm raised due to battery failure (a small battery inside controller)
Compressors worked as usually, but freon didn’t flow because ECV was closed, so cooling liquid temperature start to increase.
At 10 Am interlock blocking occurred because liquid temperature increase up to 25°C
At 1 Pm after analysis problem temporary fixed: ECV switched on in manual mode and 43% opened.
But that is only temporary solution: battery should be replaced to new one ASAP.
PHOS cooling now working in normal operation mode.
01/10/2009 2
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct) Liquid temperature
ECV failure
Normaloperation
Interlock on Tmax
ECV operation in manual mode
01/10/2009 3
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct)Pressure in evaporation tube
Compressor works but no freon(vacuum in evaporatortube)
Normaloperation
Fatal Interlock
Electronic Control Valve (ECV) failure
Continue in manual ECV mode
01/10/2009 4
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct) Compressor cover temperature
Compressor 3 cover raise up to 80°C
Compressor 1
Compressor 2
Compressor 4
Compressor 3
ECV failure
Interlock
ECV work in manual mode
01/10/2009 5
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct) PWO, FEE temperatures
PWO3
FEE2
PWO2
PWO4
FEE4FEE3
Liquid
01/10/2009 6
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct) What is ECV controller
01/10/2009 7
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct) ECV controller diagnosis
Alarm: Battery failure
01/10/2009 8
ALICE-PHOS
ALICE-PHOS
PHOS Cooling status (1 Oct) What should be done
• Battery should be replaced with new one inside ECV controller (access to pit required)
• New blocking (interlock) should be added for compressor cover temperature (need few days for programming)
