phos cooling status (1-6 oct) brief
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PHOS Cooling status (1-6 Oct) Brief. 28 Sep start cool down to 5°C (by cooling liquid) 1 Oct at 5 Am cooling plant failure happened: ECV (electrical control valve) controller alarm raised due to battery fail (inside controller) - PowerPoint PPT PresentationTRANSCRIPT
06/10/2009 1
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PHOS Cooling status (1-6 Oct)Brief
28 Sep start cool down to 5°C (by cooling liquid)1 Oct at 5 Am cooling plant failure happened: ECV
(electrical control valve) controller alarm raised due to battery fail (inside controller)
Problem temporary fixed after 8 hours (switch ECV in manual control mode: work in non-optimal mode).
Normal operation mode started after 3 days with battery alarm OFF (after some tests with controller).
PHOS cooling now work in normal operation mode.Cooling liquid ~5°C, PWO ~7°C, FEE in 16÷20°C
range, humidity in 10÷20% range.Liquid leak ~1 L per 5 days in PHOS-4.
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PHOS Cooling status (1-6 Oct) PHOS temperatures
ECV failure
Normaloperation
C6F14Temporaryoperation(manual mode)
FEE2 FEE3 FEE4
PWO2
PWO3
PWO4
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PHOS Cooling status (1-6 Oct)PHOS-2 humidity, 7÷15%
FEE2PWO2
%
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PHOS Cooling status (1-6 Oct)PHOS-3 humidity, PWO=20%, FEE=15%
FEE3
PWO3
%
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PHOS Cooling status (1-6 Oct)PHOS-4 humidity, PWO=12÷20%, FEE=15%
FEE3PWO3
This sensor looks strange,maybe damage?
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PHOS Cooling status (1-6 Oct)Liquid level going down, now 59 L
We have leak ~1 Liters per 5-6 days (inside PHOS-4, it seems)
Liquid filling
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PHOS Cooling status (1-6 Oct)Temperature of pump’s cover
Cooling plant have 2 pumps. 1st pump looks more “cold” (why?).During 1 Oct incident pump temperature raised up to 45°C.
Pump1 Pump2
Pumps works in “round-robin” mode to have equal resource (working time)
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PHOS Cooling status (1-6 Oct)Temperature of compressor’s cover
In normal operation mode cover have temp-re in 35÷58°C range.During 1 Oct incident compressor temp-re up to 70÷80°C.
Pump1 Pump2
In manual mode temp-re range more wide (20÷60 °C).
Compressors works in “round-robin” mode to have equal resource (working time)
Interlock on compressor’s cover temperature should be added to control software
Compressor-1
Compressor-2
Compressor-3
Compressor-4
Normal mode
Manual mode(not optimal)
Incident 1 Oct
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PHOS Cooling status (1-6 Oct) What is ECV controller
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PHOS Cooling status (1-6 Oct) ECV controller failure
Alarm: Battery failure
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PHOS Cooling status (1-6 Oct) ECV controller problem fixed now
Battery Alarm switched OFF
as tests with controller show,
controller can work without battery if
battery alarm is OFF
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PHOS Cooling status (1-6 Oct)To Do
• ECV controller alarm signal should be connected to cooling control system
• Some additional program (software) blocking (interlocks) should be added
• Some investigations should be done to find optimal and fault-safe parameters of cooling control software
• Documentation should be updated after this changes
• PHOS-4: to be or not to be…After this will be done, we are ready to cool
down to -25 (?) It will takes about 2-3 weeks (?)