Caleb Tennis A day in the life of a DC manager, part 2

March 7, 2011 by · Leave a Comment 

Following off part 1, today we’ll look at the electrical systems.

Incoming Power

The incoming power feeds that service data cave run through large 4000A breakers before distributing out to subfeed breakers to the equipment in the facility.  At this stage the power is monitored for quality, harmonics, and proper voltage.  We have status lights on the gear itself, as well as panel readouts.  Each breaker in the switchgear has been individually tuned to support its own load, and the health of each breaker is watched.

Of course, this is all monitored remotely to our NOC as well.

Flywheel UPS

Two feeds of power go to the flywheel UPS systems.  These systems condition the power, ensuring that what the end customer IT load sees is always available, clean, redundant power.  These units have status system displays on them that we spot check daily, and the rotational speed (7700rpm) and DC bus voltages of the flywheels are monitored remotely in our NOC.

Power Distribution Units

Each data suite in the facility has separate power distribution units that take the power from the flywheel UPS systems, step down the voltage, and then provide the individual breaker feeds to the customer cabinets.  We spot check these systems daily, and the health of each PDU is monitored from our NOC.


Each of our generators is spot checked daily, and more thoroughly checked weekly to ensure they are ready to start at a moments notice.  Remotely, our NOC monitors for any fault conditions that the Engine Control Module on the generator may have encountered, and we also monitor important standby conditions such as coolant temperature.

Stay tuned for part 3.

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