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<== Date ==> | <== Thread ==> |
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Subject: | UMAC - PowerPMAC thermal issue |
From: | Joe Sullivan <[email protected]> |
To: | Beamline Controls <[email protected]> |
Cc: | Epics Questions <[email protected]> |
Date: | Wed, 19 Aug 2009 09:44:43 -0500 |
Note to DeltaTau UMAC system users (based on experience with a cooked PowerPMAC CPU): The passive cooling design of the DeltaTau UMAC crates seems marginal for the requirements of the PowerPMAC CPU. For this board to remain within nominal temps (~60C) it requires ventilated top and bottom cover plates on the CPU slot and adjacent slot (left side). The UMAC racks shipped with PowerPMACs are configured correctly (see picture). http://www.aps.anl.gov/bcda/Images/ppmac_rack.jpg The problem is when the PowerPMAC is installed in a preexisting UMAC crate that shipped with another controller board (ie. Turbo UMAC). These crates have solid top and bottom cover plates that need to be replaced (or removed). The standalone PowerPMAC board ships with one set of ventilated cover plates for the CPU slot but not the adjacent slot. The CPU does overheat in this configuration (> 68C). http://www.aps.anl.gov/bcda/Images/umac_top.jpg The solution is to either acquire another set of ventilated cover plates or to remove the plates altogether. This setup does run effectively. http://www.aps.anl.gov/bcda/Images/umac_fixed.jpg Additional Note: Care should be taken to mount the UMAC crate in it's natural horizontal position (front facing out) to allow for maximum air circulation. -- Joseph Sullivan [email protected] <> 630-252-8657 Advanced Photon Source APS Engineering Services Division Beamline Controls & Data Acquisition Group