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1. 1. Bad stability of cooling Bad stability of cooling system.system. 2. 2. Bad stability of Digital DC power Bad stability of Digital DC power
supply.supply. 3. Low 3. Low reliability of relay on pin reliability of relay on pin card .card .
Top 3 problems !
Cooler introductionCooler introduction
Controller
Filter
Purge Tank.
External coolingwater!
FARMNT !到 的 水 管
!到 測 試 頭 冷 卻 水 水 管
Cooler stability problem
It could not be cooled effectively !
Flow sensor Filter Snubber Air in the waterLeak
CoolerCooler stability problem stability problem
Cooler couldnot cool the
waterevvectively
Sensoris bad !
Filter/snubberbe blocked !
Leak !
To much air !
真 因
This sensor measurethe flow rate of
cooling water inside the cooler.
Filter , it is filtering the water and remove
some of its impurities.
Snubber :It protect the
sensor .Leak : it damage Pin card,
FARMNT board and T/H backplane
Too much air in the cooling water, would
decrease its effect!
Five problems analysis Five problems analysis 五大問題分析五大問題分析
故 障 年 度 Seneor Filter Snubber Leak Air in the water
2001年總數 17 117 205 67 27
17
117
205
6727
0
50
100
150
200
250
年度總次 數
Seneor Filter Snubber 漏 水 空氣問題
項目
2001年總次數 Cooler problem
Seneor4% Filter
27%
Snubber48%
Leak15%
Air in thewater6%
How to find the solutions of cooler problem ?How to find the solutions of cooler problem ?
對Cold Plate影響Coolant Advantage Defect
Distill water and bleach Prevent Biological growth! Bleach cause corrosion of ColdPlate , and get impurites !Distill water only No corrosion and less impurities! Can not prevent Biological growth!
Pure water (non ion) Less impurities ! Can not prevent Biological growth, acidic water will corrode coldplate!Pure water (non ion)and bleach Prevent Biological growth,less impurities ! Bleach and acidic water will corrode coldplate!!
原廠鋁質原廠鋁質 ColdPlateColdPlate 與不同水質之驗證與不同水質之驗證
According to LTX stand servicemanual, use distill water and
bleach could prevent the Biologicalgrowth.
What we should improve is this
What kind of Cold Plate is good for What kind of Cold Plate is good for distill water and bleach ?distill water and bleach ?
Material of Cold Plate The result after it use distill water and bleach Aluminum Be easy to corrode and make impurities !
Aluminum be electroplated Better than pure Aluminum.Plastics It is hard to corrode and less impurities.
What is the advantage What is the advantage when we use Plastics Cold Platewhen we use Plastics Cold Plate??
Cold Plate Snubbertype Snubber Live time Filter live timeOrigional Type 2 months 2 months
Aluminum G type 2.5 2E type 3 2Type 1 3 3.5
Aluminum be electroplated G type 3 3.5E type 3 3.5Type 1 no no
Plastics G type no noE type 4 5
• Less impurities will help to improve the Less impurities will help to improve the life time of snubber and filter !life time of snubber and filter !
• We expect !We expect !
What we should do now about Leak ?What we should do now about Leak ?
>>Corrosion on Corrosion on Cold plate and Cold plate and connector . connector . >MCM leak .>MCM leak .
•What was the cause of theWhat was the cause of the leak ? leak ?
•SoluctionSoluction: : >Replace them with >Replace them with Vendor ASAPVendor ASAP!!
Relay problem on digital pin cardRelay problem on digital pin card
RESULT PIN ACTUAL TARGET LOWER UPPER======== ==== ============= ======= ===== ========= 7 655.17377m 750m 0 2.000000 8 622.421988m 750m 0 2.000000**FAIL** 9 2.600212 750m 0 2.000000 10 644.60327m 750m 0 2.000000
•The The reliability of relay is bad , it always reliability of relay is bad , it always make some functional /open-shortmake some functional /open-short problem problem ..
•Improvement: Replcae the relay Improvement: Replcae the relay ..•Other action : When do the PM ,run the Other action : When do the PM ,run the
relay checker too!relay checker too!
•Why do we want to improve this Why do we want to improve this ??
StandardizationStandardizationItem PM Before improvement .
Cold Plate Aluminum or Aluminum be electroplated.Filter Monthly PM check it, ,quarterly PM replace it ,but actually it is impossible !
Snubber No define !Relay checker No define !
Item PM after improvementCold Plate Use Plastics Cold Plate.
Filter Get the standard ,Monthly PM check it, ,quarterly PM replace it,or >>25PSI.Snubber Check every week, replcae it every quarterly PM .
Relay checker Check it every monthly PM .
ConclusionConclusion
This is very hard to write...This is very hard to write...
““cooler” =“cooler” =“ 哭了”哭了”
The End .The End .