[Analysis] The Final Key to Unmanned Data Centers: Chiller Auto-Restart

In unmanned data center operations, the automatic recovery capability of cooling systems is more critical than power and network redundancy. During a power outage, the chiller controller is maintained by UPS power and waits silently for up to 100 seconds until generator power is supplied, without triggering alarms.

During this period, the controller initiates the operation sequence, but if there is no actual power and the pumps do not operate, it does not proceed to the next step due to the lack of feedback signals. Once generator power is restored, the chilled water pump starts and feedback is returned, after which the cooling water pump and compressor are automatically restarted in sequence.

Field test results show that it takes approximately 4 minutes and 30 seconds from the occurrence of a power outage to the complete recovery of the cooling system. This auto-restart logic is currently recognized as a standard technology in the global data center industry and is an essential condition for unmanned operations that enable stable recovery without human intervention.