On Sunday, September 11, we conducted scheduled maintenance in our Anchorage Data Center (ADC) which required a complete shutdown of all equipment. Our electrical contractors and Facilities group needed to investigate and re-route electrical circuits associated with our emergency shutdown systems (UPS and FM200). We had a unexpected catastrophic power loss to ADC on July 28 which created considerable damage and was found to be caused by electrical wiring system design.
The Sunday maintenance went well. Electrical circuits were documented and several changes were made to isolate UPS from shutdown except through manual shutdown. Electricians turned ADC back over to our N/SOC folks about 7am.
System startup and service Return to Service (RTS) testing took the full remainder of our maintenance window. All services were back in place by noon. There was some drama and lessons-learned. A de-briefing is taking place right now. Tag list of actons required is forthcoming...
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