Dear BNC Users, Since this morning at 7AM, BNC Engineering staff completed a deeper evaluation of this intermittent failure. It appears that there is a communication error between the system CPU to PLC controller when the ultra-pure water system fails. Engineering staff replaced 2 power supplies and 1 communication patch cable hoping to eliminate these communication errors. These changes were implemented earlier in the day to allow time to monitor the ultra-pure water system. At the same time we were able to bring our cleanroom humification system back online and the clean room is currently under humidity control. We are back to normal operations and we are cautiously optimistic that the issue is corrected, only time will tell. Regards, Mark From: Bnc-facility-notice <bnc-facility-notice-bounces@ecn.purdue.edu> On Behalf Of Voorhis, Mark L. Sent: Thursday, May 11, 2023 7:03 AM To: bnc-facility-notice@ecn.purdue.edu Subject: [Bnc-facility-notice] NOTICE #3 - Failure & Recovery of the Ultrapure Water System and Cleanroom Humidity Control Dear BNC User, This morning at 6:45AM the ultrapure water system failed and shut down again. There is no ultra-pure water flow in the building at this time. As a result, we have shut down our cleanroom humidification system to prevent water leaks above the cleanroom. The cleanroom humidity is out of control as it is dependent on ultrapure water to operate.
From the ultra-pure water failure last night it is unknown what the intermittent issue is, but it appears to be a controls issue. BNC engineering staff will further investigate the issue to find the root cause.
We are sorry for this unscheduled interruption. We will keep you posted as more information comes in. Regards,