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Ask the Engineer – What can be done to become more energy efficient and incorporate Green IT in the Data Center?

Posted by Bob Parente on Jan 8, 2011 10:01:00 AM

Not only for the environmental reasons that you may expect, but for the economic benefits seen by incorporating Green IT in the data centers. Going “green” means measuring, analyzing and controlling power usage to enable effective capacity planning along with aptitude to make change for decreased usage – all leading to improved efficiency and a controlled carbon footprint.

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Topics: energy efficiency, green data centers, ask the engineer

Ask the Engineer – Do Server Technology 3-Phase CDUs provide a means for load balancing during IT device installation?

Posted by Bob Parente on Jan 5, 2011 2:37:00 PM

Yes, any Server Technology 3-phase Metered, or 3-Phase Intelligent (Smart, Switched, POPS) functional CDU products will provide Branch or Phase current displays for local hands-free viewing to immediately identify balanced loads.  This information is also available remotely through any Intelligent CDU communications interface.

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Topics: ask the engineer

Ask the Engineer – What considerations should be made when selecting a ‘power-strip’, or Server Technology CDU (Cabinet power Distribution Unit) to power the IT equipment in my rack/cabinet?

Posted by Bob Parente on Dec 9, 2010 12:16:00 PM

In most cases it is much more than ‘simply considering the power-strip hardware configuration’.  How a Power distribution solution is implemented can lead to reduced downtime, improved power efficiencies, improved power monitoring, management and control.  The best suited Power Distribution solution requires considerable planning.  First, system solution level questions must be evaluated (1), key issues determined (2), and then the required CDU features can be realized (3).

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Topics: ask the engineer

Ask the Engineer - Will Branch Circuit Protection eliminate concern for tripping an upstream breaker?

Posted by Bob Parente on Nov 29, 2010 9:00:00 AM

The combined load of branches on a power strip may be capable of exceeding the upstream input protection. There is a fundamental misunderstanding of the purpose of the power strip internal fuse protection. The fuses are not there to keep the upstream breaker from tripping.  Circuit protection within the power strip is there to protect the outlets and wiring to the outlets. Thus, a power strip may be protecting the branch outlets at 20A per NEC allowance while the upstream breaker is protecting the wiring and under-floor receptacle.

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Topics: Data Center, PDU

Ask the Engineer - Is branch circuit protection on a 20 amp rated power strip required in North America?

Posted by Bruce Auclair on Nov 29, 2010 8:08:00 AM

Branch circuit protection on a 20A rated power strip is not an National Electrical Code1 (NEC) requirement.  Server Technology has both 20A Inlet rated CDU products with and without branch circuit protection.  The presence of Bussmann SC-20 fuses on 20A units, even though not required, allows for selective coordination with short-circuit faults.  Fuses react fast enough to halt a short-circuit fault nearest the fault while also reducing let-through to upstream and parallel branch gear.

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Topics: PDU, Server Tech

Ask the Engineer - How do I calculate power from 3-phase LED readings?

Posted by Robert Faulkner on Oct 9, 2010 9:29:00 AM

Question from Steven G.: How do I calculate the power usage for devices attached to one of your Smart PDU's by looking at the digital readouts on them? I understand the 3-phase power calculation of P=VA*1.73, but is that done on each leg/phase (x,y,z) for the PDU? An example from a CS-24VY-L30MA is X=4.6, Y=4.6, Z=6.3

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Topics: How To, smart PDU, 3 phase PDU, PDU

Ask the Engineer - Do you have any rack-mount UPS recommendations?

Posted by Robert Faulkner on Oct 4, 2010 1:40:00 PM

On occasion, an installation consists of only a few cabinets and it is desirable to place individual UPS units within each cabinet. Although Server Tech does not provide UPS products and remains manufacturer agnostic, there are a couple things that should be considered from the power distribution point of view.

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Topics: rack mount power distribution units

Ask the Engineer - Automatic reboot when a device fails to respond to a ping request?

Posted by Robert Faulkner on Dec 30, 2009 9:23:00 AM

Question from Carlton <omitted>: I have multiple remote DSL modems that each stop working two to three times a week.  I've deployed 2-outlet Sentry Switched CDU units to allow me to remotely reboot them when they hang, and they work great!  But, I have to wait until someone notifies me of the problem, then I have to manually login to the CDU to initiate the reboot.  I've noticed that the DSL modems fail to respond to ping requests when they hang.  Is there a method available to automatically reboot the DSL modems when they stop responding to ping requests? 

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Topics: data center power, CDU

Ask the Engineer - How much power should I provision for my cabinets?

Posted by Robert Faulkner on Dec 30, 2009 8:57:00 AM

This is a common question I receive: How much power should I provision for my cabinets?

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Topics: data center power

Ask The Engineer - Should Neutral Conductors Be Oversized?

Posted by Robert Faulkner on Dec 16, 2009 12:47:00 PM

Question from Jay <omitted>: I am presently evaluating a CDU model #CS-27VY-L30M and have noticed that the power input cordage does not involve an oversized neutral conductor.  All five conductors are 10-gauge AWG.  Isn't an oversized neutral required to avoid the possibility of overheating the conductor?

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Topics: PDU

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